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TZB-info is an Internet resource specialising in information on construction, energy savings, and the related fields collectively referred to as mechanical and electrical systems usually known as building services (in Czech abbreviated as TZB). Its primary focus lies within the construction of buildings and energy issues related thereto. Whether you're looking for heating, electricity, heat loss reduction or building efficiency, the portal offers up-to-date information on the developments in those fields every day. The information presented by TZB-info is carefully selected and edited, serving a diverse audience of professionals ranging from designers to installers but also the general public. TZB-info records 750,000 visits every month. read whole text

Latest reviewed editorial research papers in the field of building services engineering

Heating

Efficiency of domestic hot water preparation by heat pump in different climatic areas

11.11.2019 | Ing. Yauheni Kachalouski, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper deals with the influence of climatic conditions on the efficiency of operation of air-water and ground-water heat pumps in domestic hot water preparation. Simulation analysis was performed for domestic hot water abstraction by a family of four in different climatic locations in Europe. It has been found that the efficiency of both types of heat pumps does not differ substantially. The surprising conclusion is that the considered ground-water heat pumps are slightly more efficient in hotter regions for hot water preparation, while air-water heat pumps are slightly more efficient in climatically mild and colder locations.
© Fotolia.comHeating

Heat pumps in apartment buildings

4.11.2019 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper shows the difference in the economic parameters of the use of heat pumps in multi-dwelling buildings between the case of reconstruction and new building. The examples show the balances of two specific studies prepared in 2017 and 2018 for customers. While heat pumps in apartment building reconstructions can be advantageous only at relatively high energy prices above 700 CZK / GJ, in new buildings they can be an economical source of heat.
Heating

Is it enough for clener air to install new boilers?

28.10.2019 | Ing. Jiří Horák, Ph.D., Ing. František Hopan, Ph.D., Jiří Kremer, Ing. Kamil Krpec, Ph.D., Ing. Milan Dej, Ph.D., Ing. Petr Kubesa, Ing. Lenka Kuboňová, Ph.D., Ing. Jiří Ryšavý, Ing. Oleksandr Molchanov, VŠB-TU Ostrava, Výzkumné energetické centrum
Measurements were made on eight modern boilers meeting the requirements for Ecodesign in real operation. Their achieved emission and operating parameters are presented in this paper.
5 comments, last 04.11.2019 10:56
Heating

PV system balance in a family house with a heat pump

14.10.2019 | Ing. Jiří Novotný, ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper presents an analysis of PV system usage without a battery storage to cover electricity consumption for single family house with 4 persons and heat pump as a heat source for heating and preparation of domestic hot water. The result of the analysis shows the importance of using a sufficiently short time step of load profiles for correct assessment of solar fraction of PV system. Simplifying chart for fast estimation of solar fraction in a given application (heat pump, user energy) has been developed.
3 comments, last 14.11.2019 09:27
Ventilating and Air-Conditioning

Monitoring of selected parameters of the internal environment of an office building in winter

14.10.2019 | Prof. Ing. Pavol Ďurica, CSc., Ing. Peter Barňák, Žilinská univerzita v Žiline Stavebná fakulta Katedra pozemného staviteľstva a urbanizmu (KPSU SvF ŽUŽ)
In the contribution, we are focused on the quality of the heat-moisture microclimate and the aspects that affect it. We chose one office room in the building of the Research Center of the University of Žilina (UNIZA), oriented to the west. The subject of the measurements were all physical components of the indoor environment, the effect of solar radiation through window constructions and floor temperatures using low-temperature radiant floor heating. The contribution describes measuring methods, results of measurements and related partial conclusions for cold climatic conditions of the year.
Ventilating and Air-Conditioning

Ventilation of Commercial Kitchens According to ČSN EN 16282

17.6.2019 | Jan Foret, Ing. Petr Morávek, CSc., Ing. Tomáš Kott, ATREA s.r.o., doc. Ing. Vladimír Zmrhal, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Vytápění, větrání, instalace | Vytápění větrání instalace č. 5/2018
Sufficient and well-designed ventilation of kitchens is a prerequisite for ensuring a high quality indoor environment in terms of temperature and humidity requirements. It is not only the removal of the produced steam and prevention of the subsequent condensed water flow, but also the elimination of all the harmful substances resulting from cooking (water vapor, aerosols or flue gases), odors and heat. Removing all pollutants from the kitchen area prevents the formation of molds and other microorganisms that could negatively affect the hygiene of the environment and the building structure of the entire space, thus affecting the operation of the kitchen. This article describes the design of kitchen ventilation according to the new set of standards ČSN EN 16282.
Ventilating and Air-Conditioning

Direct Free Cooling of Data Centres

4.6.2019 | doc. Ing. Vladimír Zmrhal, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Vytápění, větrání, instalace | Vytápění větrání instalace č. 4/2018
Data centres are a significant energy consumer, which is related to both the operation of IT technology and its cooling. It is the part of the consumed energy intended for the cooling of data centres, which, in some cases, has the potential for saving measures. The paper targets the possibilities of using outdoor air for free cooling of data centres and tries to financially quantify possible savings. Several analyses were carried out based on a real example of an existing data room equipped with a cooling circulation system.
Ventilating and Air-Conditioning

Designing ungerground garage ventilation using CFD simulation

19.2.2019 | Ing. Miroslava Kmecová, doc. Ing. Michal Krajčík, Ph.D., Stavebná fakulta STU v Bratislavě, Katedra technických zařízení budov, Mgr. Jozef Vojtaššák, Colt International, s.r.o.
The removal of heat and combustion products in the underground garage of the commercial and entertainment center was solved by the smoke clearing system. In the garage, vacuum ventilation was considered. The difference between the exhaust and the intake air was 20%.
Ztráty vody z distribuční sítě,  ilustrační obrázek Havárie vody,  foto  redakceWater and Drainage

Porovnání metodik pro stanovení ztrát vody z distribuční sítě na základě vyhodnocení minimálních nočních průtoků

2.10.2019 | Ing. Jana Nováková, Ing. Jan Ručka, Ing. Tomáš Sucháček, Ing. Markéta Rajnochová, VUT v Brně, Fakulta stavební, Ústav vodního hospodářství obcí | Odborná konference doktorského studia Juniorstav
Water and Drainage

Drainage water quality (nutrients, pesticides) and its potential effect on water sources

2.9.2019 | Mgr. Antonín Zajíček, Ph.D., Ing. Petr Fučík, Ph.D., Ing. Renata Duffková, Ph.D., Mgr. Markéta Kaplická, Výzkumný ústav meliorací a ochrany půdy, Ing. Jana Maxová, Výzkumný ústav meliorací a ochrany půdy Praha
More than 25% of agricultural land area in the Czech Republic (1.065 million ha) has been drained, thus a significant proportion of stream flow comes from tile drainage outlets, especially during hydrological events (RRE) such as snowmelt, summer storms and long periods of rain. Besides positive effects of soil aeration and productive function of agricultural lands, intensive land drainage has some negative effects on the environment such as shortening water residence time in the drained area, lowering the ground water table, and polluting shallow subsurface water with nitrates and pesticides.

This paper was focused to evaluate the loads of nutrients (nitrates, phosphorus) and pesticides from drainage systems during common low discharges and during RREs as a potential dangerous source of pollution of water sources. Second objective was to introduce some simple measure for mitigate the risk of subsurface sources of pollution.

In the case of N-NO3, the total load varied from 0.4 to 61 kg/ha/year, in the case of P-PO4 the load varied from 0.64 to 132 g/ha/year and in the case of total phosphorus the load estimation was from 1.2 to 304 g/ha/year.

R-R events had on average a 25% share of the total year runoff, 24% share of the N-NO3 load (from 2% to 86%), 42% share of the P-PO4 load (from 2 to 98%) and in the case of total P 40% (from 1 to 97%). This big load differences were caused mainly by the varying hydrologic connectivity of the particular subcatchments and also by the different number of events in different monitoring seasons.

When dealing with intensively-used drained agricultural lands with common drainage specific runoff (0.02–0.05 l/s/ha), the typical R-R event share was 50% of the total annual load of both forms of phosphorus monitored. While for sufficiently exact N-NO3 load estimation continuous measurement of drainage discharges and regular grab water sampling are important, the phosphorus load estimations were strongly underestimated even with the use of continuous discharge measurements. To obtain information about the dynamics of nutrient loads during the season and particular events, the monitoring must be improved by continuous sampling during R-R events.

Results of pesticides monitoring proved that drainage systems represent a significant source for pesticides leaching from agricultural land. Leaching of pesticide metabolites was mainly associated with baseflow and shallow interflow. It is often old and long – time burden with concentration varying 2 000 – 5 000 ng/l. Water from causal precipitation usually diluted their concentrations. The prerequisite for the leaching of parental compounds was a rainfall-runoff event occurring shortly after spraying, and the presence of event water in the runoff. When such situations happened consequently, pesticides concentrations in drainage water could be extremely high up to 200 000 ng/l) and the pesticide load reached several grams in a few hours.

The above mentioned results are useful for establishing effective monitoring systems for watershed management authorities and policy makers and also for realistic assessment of pollutant fluxes within the tile drained agricultural catchments. The results also proved the need to design measures in the areas most vulnerable by subsurface (drainage) pollution. As protective measures, grassing of recharges zones, biofilters and constructed wetlands were introduced.

© Artusius - Fotolia.comWater and Drainage

Legal Requirements on the Water Treatment Plants Which Use Ground Water as a Source

19.8.2019 | Ing. Barbora Sedlářová, Ing. Eva Juranová, Výzkumný ústav vodohospodářský T. G. Masaryka Praha
The article summarises the legal requirements on the water treatment plants, which use ground water as a source. These treatment plants belong among the naturally occurring radioactive material (NORM) industries. There is a legal obligation to measure and assess the natural radionuclides in drinking water produced. According to the new law no. 263/2016 Coll. (nuclear law) and the executive acts, further obligations were set on the water treatment plant operators. These obligations concern evidence, measurement and assessment of radionuclides in the materials released from the plant, which mostly concerns wastewater, sludge or filter bed materials. On the example of three ground water treatment plants, the measured content of natural radionuclides in sludge is presented.
Water and Drainage

Risk in drinkwater supply – organoleptic flaws

23.7.2019 | doc. RNDr. Jana Říhová Ambrožová, Ph.D., Ing. Monika Dujčáková, Ing. Dana Vejmelková, Ph.D., VŠCHT FTOP ÚTVP Praha, Ing. Jiří Kosina, VŠCHT Praha, Centrální laboratoře, Laboratoř hmotnostní spektrometrie, Ing. Tomáš Munzar, ENVI-PUR, s.r.o.
Taste-and-odour compounds reduced the availability and quality of surface water for drinking are commonly found in surface water. These compounds are produced by microorganisms, i.e. bacteria, cyanobacteria etc., and very often found are geosmin (earthy flavour) and 2-methylisoborneol (2-MIB, mildewed flavour). Geosmin and 2-MIB are not removed by standard water treatment technologies and require very specific management and usage of supplementary treatment. Paper deals with the character of geosmin and 2-MIB, their occurrence in environment, therefore suitable methods of detection and technological management in drinking water treatment technologies.
Renewable Energy

Influence of climatic conditions on gains of solar systems for domestic hot water production

9.9.2019 | Ing. Viacheslav Shemelin, Energetické systémy budov, UCEEB, ČVUT, Buštěhrad, Ing. Bořivoj Šourek, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper deals with simulation analysis of solar system for domestic hot water preparation for apartment building. The analysis shows the influence of climatic conditions on solar system gains. The aim is to verify whether the level of solar gains can be guaranteed in the Czech Republic's climatic conditions. In discussions over the efforts to guarantee the benefits of a designed and installed solar system, another question arises as to how the total solar radiation changes year-on-year and whether its annual fluctuations can be simply passed on to the solar system's profit.
Ilustrační foto © TZB-info.czRenewable Energy

Stadium effect for solar trackers

22.8.2019 | Ing. Ján Zaťko
Photovoltaics has been known for decades, and there have been many discussions about whether and where a power plant with fixed panels or panels with automatic winding to the sun is more economical. While falling panel prices and the latest technical breakthroughs have been progressively sending solar trackers to history, let us try to offer one more idea to the photovoltaic team, who continue to consider trackers as perspective.
2 comments, last 25.08.2019 20:55
Renewable Energy

Position of renewable energy sources in the energy balance of the Czech Republic

1.8.2019 | Ing. Jana Veverková, Ph.D., Ministerstvo průmyslu a obchodu
The second part of the article on renewable energy sources (RES) in context of the energy balance focuses on the transformation process and final consumption and follows the first part, where RES were introduced as primary energy sources.
1 comment, 03.08.2019 06:56
Renewable Energy

Position of renewable energy sources in the energy balance of the Czech Republic

25.7.2019 | Ing. Jana Veverková, Ph.D., Ministerstvo průmyslu a obchodu
The article focuses on the introduction of renewable energy sources (RES) in the energy balance as primary energy sources, during the transformation process and their use for final consumption. The first part is devoted to basic terminology and primary energy sources, the second part focuses on the transformation process and final consumption.
Electrical Engineering

Retrofit in terms of measurement and regulation

18.2.2019 | Ing. Jan Vidim
Measuring and control devices as well as other HVAC systems, run through their lifecycle, at the end of which the system needs to be reconstructed. A key condition for a successful retrofit is to determine the required life of the refurbished equipment.
Electrical Engineering

Big or small control system? Difference in Approaches

20.11.2018 | Ing. Jan Vidim, Domat Control System s.r.o.
The "size" of the control system has a significant impact on how individual actors in the supply chain - investor, designer, salesman and implementation technician or programmer - are approaching it. But how do you determine the size - and how do you define it at all? In terms of measurement and regulation, we can highlight two main factors: range and complexity.
Electrical Engineering

The history and development of thermostats

16.7.2018 | Ing. Jan Říšský, JOHNSON CONTROLS INTERNATIONAL, spol. s r.o.
A brief overview of the history and development of thermostats. Since the first discovery of properties of the bimetal to the present, when the thermostat does much more than just control the heat source.
Electrical Engineering

Projecting weak current IV. – position of the designer

14.5.2018 | Ing. Tomáš Mikula
What is the current position of low-current systems designer? Let's try to summarize it.
Elevators

Provozní prohlídky výtahů

24.8.2015 | Ing. Bohuslav Kratěna, Unie výtahového průmyslu České republiky
Elevators

Poznatky z prověřování (auditu) firem provádějících servis na výtazích

20.7.2015 | Vladimír Hulena, pověřený HK ČR k provádění auditu
CSN 27 4002 2014 Safety rules for lifts - Operation and service of lifts has introduced a new term by an authorized service company. It is the transparency of professional competence companies in servicing elevators, to owners / operators can better decide with whom an agreement that service because it has a major impact on their responsibility to ensure the safe operation of elevators. Therefore, for this situation was the subject of speculation, it was decided to examine service firms independent commissioners, contracted authorizing body, in this case, the Chamber of Commerce, which, when positive evaluation subsequently issue a certificate of authorization, and the company name may Authorized service company use.
VýtahElevators

News in the standards and audits for elevator industry

28.7.2014 | Ing. Jan Dvořák, Ing. Bohuslav Kratěna, Vladimír Hulena, Unie výtahového průmyslu ČR
Union for Elevator Industry summarizes the most important news in the standards and audits, as presented at the seminar Elevators 2014. This includes controversy with a new concept of authorized service company that has been published on our portal in advance.
Zákaz používání výtahu za požáru - výtah neslouží k evakuaci osobElevators

Standards in the projects in terms of fire safety of elevators

21.7.2014 | plk. Ing. Zdeněk Hošek, Ph.D., Ministerstvo vnitra ČR, generální ředitelství Hasičského záchranného sboru ČR
Elevators belong to a very important building services and technologies. For these reasons, they need to pay attention not only in terms of proper technical implementation, but also in terms of fire safety. In particular, fire and evacuation lifts, which are also very important fire safety devices must also meet the stringent technical requirements of fire protection.
Korečkové rypadlo v povrchovém dole, foto Energetics

Uhlí v České republice

5.11.2019 | Ing. Aleš Bufka, Ing. Jana Veverková, Ph.D., Ministerstvo průmyslu a obchodu

Energetics

Blackout and offgrid operation

10.10.2019 | Ing. Zdeněk Burdek, ČEZ Distribuce
The article describes various offgrid operation modes as an option for mitigating consequences of a power outage - blackout.
9 comments, last 21.11.2019 00:02
Energetics

Development of electric vehicle market in the Czech Republic: state support and foreign experiences

14.5.2019 | Mgr. Iva Zvěřinová, Mgr. Milan Ščasný, Ph.D., Mgr. Zuzana Martínková, JUDr. et Mgr. Vojtěch Máca, Ph.D., Centrum pro otázky životního prostředí, Univerzita Karlova
The largest market share of new registered passenger battery electric vehicles in Europe is in Norway (31 %), the Netherlands (5 %), Sweden, Austria and France (2 %). The share of electric vehicles in new vehicles registrations remains low in the Czech Republic, reaching 0.27 % in 2018. Policy measures can significantly support adoption of electric vehicles by consumers. Based on a literature review, we discuss a wide range of policy measures to support battery electric vehicles (BEV), including effectiveness of these measures. Further, we describe support measures in the Czech Republic. Last, we aim at the expected trends in BEVs and a policy design that may support to increase market share of BEV technology when undesirable side effects on inequality, public finance and the environment are minimised.
1 comment, 25.09.2019 10:21
Energetics

Economic evaluation of (not)investment to combinated heat and power

1.4.2019 | Ing. Jakub Maščuch, Ph.D., Ing. Václav Novotný, Michal Tobiáš, Univerzitní centrum energeticky efektivních budov ČVUT v Praze
How can be investor's decision so much different from technical-economical optimalization and usual discounted cash flow assessment?
Facility management

Diagnostic of Building Objects by 3D Mobile Mapping Method

28.6.2019 | Ing. Lenka Mičechová, prof. Ing. Ján Mikolaj, PhD., Žilinská univerzita v Žiline | Odborná konference doktorského studia Juniorstav
The paper is focused on the evaluation of the possibilities using the diagnosis of building objects and outcomes of the mobile 3D scanning process of existing objects and their software transformation using Building Information Modeling (BIM). Emphasis is placed on the creation of building object based on the point cloud determined by 3D mobile mapping. The main objective was to process measured data from mobile mapping, import data into the Autodesk Revit program and create a BIM model. A partial objective was to compare the resulting object originating from the point cloud to the existing project documentation. Conclusion of the paper is evaluating the process through SWOT analysis.
© Fotolia.comFacility management

Quantity Takeoff and Building Information Modeling (BIM)

10.4.2019 | Ing. Stanislav Vitásek, Skanska a.s., Fakulta stavební ČVUT
Building Information Modeling (BIM) is being developed in almost all construction sectors in the Czech Republic. For Quantity Takeoff (part of Cost Management, referred to as BIM 5D), this brings many opportunities and challenges associated with the need of local workflows modification in accordance to information modeling needs. This article describes how data from BIM models can be used today to cost estimates using the proposed process scheme. It also indicates what needs to be done to achieve the full utilization of the BIM method in terms of cost estimation.
Facility management

Apartment Buildings Designed with Using BIM Processes

18.3.2019 | Ing. Kamil Laco, PhD., Stavebná fakulta STU v Bratislave, Katedra betónových konštrukcií a mostov
BIM processes have brought to the design process improvement in co-ordination between different professions and, in the case of the statics profession, facilitating the creation of a load-bearing structure model. The duplicate work was removed, where the same structural elements had to be modeled by two offices, both architectural and static. In addition, these models are now interconnected and coordinated. In this article, we will present the entire process on a project of the load-bearing structure of a set of apartment buildings with a common underground floor. It is designed on the basis of current European standards using BIM processes for its design and drawing documentation.
Facility management

The task of facility management in a creation of the working environment – part 2

4.3.2019 | doc. Ing. Viera Somorová, PhD., Katedra technológie stavieb Stavebná fakulta STU BA
Facility management contributes to the smooth running of the organization's core business, helping to create a quality work environment for workers, a prerequisite for increasing performance, improving work quality, reducing health outcomes and stress factors.

RECENT REVIEWED EDITORIAL RESEARCH PAPERS IN THE FIELD OF BUILDING SERVICES ENGINEERING


Heating | Ventilating and Air-Conditioning | Water and Drainage | Renewable Energy | Electrical Engineering | Energetics

Latest reviewed editorial research papers in the field of construction

Shell Construction

Příprava průmyslové výroby mezerovitého vláknobetonu

20.11.2019 | doc. Ing. Jan Vodička, CSc., ČVUT v Praze, Fakulta stavební, katedra betonových a zděných konstrukcí, Ing. Hana Hanzlová, CSc., Ing. Luboš Musil, ČVUT v Praze, Stavební fakulta, katedra betonových a zděných konstrukcí
The paper deals with practical use of fibre reinforced concrete with open structure in practice. There is amount of different connections between laboratory and industrial production of large volumes of fibre reinforced concrete (ca. 100 m3). The results of the initial fresh concrete test in situ show a real difference between these two processes for fibre reinforced concrete production.
© Fotolia.comShell Construction

Adhesion of coating films on rot wood

13.11.2019 | Ing. Gabriela Slabejová, PhD., Technická univerzita vo Zvolene, Drevárska fakulta, Katedra nábytku a drevárskych výrobkov, Ing. Zuzana Vidholdová, PhD., Technická univerzita vo Zvolene, Drevárska fakulta, Katedra drevárskych technológií
Treatment of wood surfaces with various finish coating materials is recommended for long term protection of wood products exposed outdoor. Due to natural weathering, the colour and the surface roughness of uncoated wood is changed. However, in practice it can happen that wood in constructions has been attacked by wood decay fungi before to application of a finish. In this work, selected properties of sapwood and heartwood of pine (Pinus sylvestris, L.) surface such as surface roughness and adhesion of coating film were investigated on the surfaces attacked by wood decay fungi (Coniophora puteana and Trametes versicolor) and wood staining fungus Aureobasidium pullulans). Two coating materials useable for wooden constructions in exterior conditions were used: dark brown polyurethane-based system and light brown oil-based surface treatment. The result of the pull-off test for adhesion of both surface treatments was significantly greater on the heartwood surfaces than on the sapwood surfaces of the sound wood. With the increasing time of wood degradation by fungi, the adhesion of the polyurethane surface treatment decreased on the sapwood. Adhesion of the oil surface treatment was comparable on the both sound and decayed wood. According to the disruption analysis following the pulling of the dolly, the weakest point was the surface layer of the wood impregnated with coatings. The adhesion of the both surface treatments is comparable to the sound and wood affected with the staining fungus.
Shell Construction

Selected Imperfections and Failures Detected During Design of Construction Work and Survey of Panel Buildings

4.11.2019 | Ing. Petr Šimůnek, Ph.D., doc. Ing. Ivana Laníková, Ph.D., Ing. Rostislav Jeneš, VUT FAST Brno, Ústav betonových a zděných konstrukcí
The paper deals with some selected imperfections and failures detected during design of construction work and survey of panel buildings within last few years.
Shell Construction

Building Extension of the Leisure Center Lužánky in Brno: Causes of the Failures and Proposal for Fixing

7.10.2019 | doc. Ing. Pavel Schmid, Ph.D., Ing. Petr Daněk, Ph.D., Ing. Iva Rozsypalová, VUT Brno, Ústav stavebního zkušebnictví, Ing. Petr Gabriel, Statutární město Brno, Magistrát města Brna, Odbor správy majetku
The paper deals with a case study of building defects inspection of Lužánky Free Time Centre in Brno. It is described the history of the building and the building diagnostics. There were used the survey methods of visual-defectoscopic inspection, semidestructive diagnosis and diagnosis of foundations and foundation soil. The conclusions contain recommendations for immediate and long-term solution of the object's static problems.
Insulation, Roofs, Facades

Changes in designing anti-radon measures according to revised czech standard ČSN 73 0601

11.11.2019 | prof. Ing. Martin Jiránek, CSc., ČVUT v Praze, Fakulta stavební
The article describes all significant changes in the field of designing and implementing radon protective and remedial measures introduced by the revised version of ČSN 73 0601, which came into force on 1.10.2019. A new way of selecting measures according to the building type and new concept of designing according to the design values of input parameters are introduced. A new methodology for designing radon-proof insulations is described in detail. According to this methodology, only insulation with a radon resistance greater than the prescribed minimum radon resistance can be used for building protection.
Insulation, Roofs, Facades

Load Bearing Capacity of Anchors for ETICS with Thermal Insulation of Higher Thickness

7.10.2019 | Ing. Dana Bellušová, Technický a skúšobný ústav stavebný, n.o.
The contribution deals with the experiment verifying the load bearing capacity of anchors for ETICS with thermal insulation of higher thicknesses. In connection with the increase of the requirements for the energy performance of buildings, the thermal insulation thicknesses are increased to meet the design conditions.
Insulation, Roofs, Facades

Anchoring systems for walls’ attached structures with thermal interruption

26.8.2019 | Ing. Martin Hataj, ČVUT Praha, pracoviště UCEEB, Ing. Robert Jára, Ph.D., Ing. Kristina Fořtová, Ph.D., doc. Ing. Petr Kuklík, CSc., ČVUT v Praze, pracoviště UCEEB
The application of external wall insulation systems is frequent today due to the increasing demand for energy saving in buildings. The structures attached in front of the facade fulfilling the supporting function must be sufficiently anchored to the external load-bearing structures. The thermal bridges solution in the anchoring system is an important factor beyond the bearing capacity. Several variants of anchor systems are available on the market to deal with thermal bridges. This article introduces the currently available solutions and presents experimental results of the selected anchoring system.
© cherokee4 - Fotolia.comInsulation, Roofs, Facades

Nová směrnice pro navrhování ochrany staveb před vodou

25.4.2019 | Ing. Luboš Káně, Ph.D., technický ředitel DEK a.s. Praha, předseda České Hydroizolační společnosti ČSSI
The ČHIS 01 guideline contains the principles of proper design for reliable protection of buildings against undesirable water and moisture exposure and the recommended methodology for designing and assessing waterproofing structures according to the degree of reliability. The principles and tools contains in the guideline may help to enhance the communication between entities involved in the process of preparation and implementation of the project.
Windows, Doors

Roof Windows for Passive Buildings

29.11.2018 | prof. Ing. Jan Tywoniak, CSc., ČVUT Praha, pracoviště UCEEB
The paper presents the building-physical context of the use of roof windows in buildings with very low energy demand. It shows their relatively significant influence on the total heat loss of a single family house and the consequence of the specific disadvantageous set-up in the pitched roof. It is shown that the thermal transmittance should not exceed 0.7 W/(m2K) with a strict limitation of thermal coupling in the connection to the roof. In the second part, the paper shows the positive effect of the slanting of the inner lining on the quality of day lighting.
Windows, Doors

Laminated glass structures in bending – stress state analysis regarding PVB and EVA interlayers stiffness

10.9.2018 | Ing. Tomáš Hána, Ing. Klára Machalická, Ph.D., doc. Ing. Martina Eliášová, CSc., Katedra ocelových a dřevěných konstrukcí, Fakulta stavební, ČVUT v Praze, Ing. Miroslav Vokáč, Ph.D., Kloknerův ústav, ČVUT v Praze
Windows, Doors

PVB and EVA temperature and loading ratio shear modulus assessment

30.4.2018 | Ing. Tomáš Hána, doc. Ing. Martina Eliášová, CSc., Katedra ocelových a dřevěných konstrukcí, Fakulta stavební, ČVUT v Praze, Ing. Klára Machalická, Ph.D., Ing. Miroslav Vokáč, Ph.D., Kloknerův ústav, ČVUT v Praze
In contemporary architecture there are many various types of glass load bearing elements such as beams, slabs, floors or even columns. Most of these elements are made of laminated glass. Individual glass plies in the panel are bonded with polymeric interlayer providing shear forces transfer between the plies. This transfer primarily depends on the interlayer´s stiffness which is ambient temperature and static load duration dependent and is the subject of a current research. Considering the fact that shear stiffnesses of most interlayers have not been experimentally verified yet, civil engineers are compelled to design laminated glass structures on the safe side. This approach results in robust and uneconomic structures. This paper deals with the initial PVB (Trosifol BG-R-20, Trosifol Extra Strong) and EVA (Evasafe) initial shear modulus assessment depending on the temperature and loading ratio, these interlayers shear stiffness comparison and important results summary.
Windows, Doors

A light pipe prototype temperature testing

5.2.2018 | Ing. Ayodeji Omishore, doc. Ing. Miloš Kalousek, Ph.D., VUT Brno, Fakulta stavební. Ústav pozemního stavitelství, Petr Mohelník, Centrum informačních technologií VUT Brno
A light pipe prototype with a concentrating mirror parabolic head was tested for temperature profiles under solar radiation. The purpose of the testing is to find maximal temperature and estimate potential risks with overheating in the position of the pipe installation into roof structures and materials.
Floors, Partition Walls, Surfaces

Possibilities of Using Specially Modified Hazardous Waste as Filler in Polymer Grount Joint

7.6.2019 | Ing. Tomáš Žlebek, Ing. Jakub Hodul, prof. Ing. Rostislav Drochytka MBA, DrSc.,, Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců | Odborná konference doktorského studia Juniorstav
This work is focused on the verification of the possibility of using specially modified hazardous waste, solidification product, formed from selected secondary raw materials as solidifying agent and hazardous waste (end-product) as a filler in polymer grout joint material. Totally, two solidification technologies were verified, the first one was wet granulation of raw materials and another one was dry homogenization. It is more advantageous to use dry homogenization technology, which is economically less demanding. The possibility of using a specially modified filler was verified by the appropriate tests, and results showed that the grout joint showed high compressive strength of approximately 50 MPa, flexural strength up to about 20 MPa. Developed material can also be characterized by very good cohesion with the cast basalt.
Jakým nátěrem ošetřit dřevo dubu v exteriéruFloors, Partition Walls, Surfaces

Which coating is suitable for oak wood in exterior use

14.1.2019 | doc. Ing. Miloš Pánek, Ph.D., Ing. Eliška Oberhofnerová, Ing. Ondřej Dvořák, Ing. Přemysl Šedivka, Ph.D., doc. Ing. Aleš Zeidler, Ph.D., ČZU v Praze, Fakulta lesnická a dřevařská, katedra dřevěných výrobků a konstrukcí, Ing. Jakub Kaloč, Matrix a.s.
Oak wood is characterized by good durability against biotic damages. However, its surface treatment by coatings is problematic, especially in the exterior expositions. In most cases, there is a rapid degradation and damage caused by weathering. Transparent variants of coating systems suffer from this phenomenon even more than pigmented ones. The article contains the results of practical experiments that lead to some general recommendations, which use leads to surface treatment of oak wood in exterior with longer durability and better colour stability.
1 comment, 14.09.2019 03:42
Floors, Partition Walls, Surfaces

Environmental benefits of using recycled wood to produce agglomerated materials (Part 3)

21.5.2018 | doc. Ing. Milan Gaff, Ph.D., Ing. Kamil Trgala, Ph.D., Ing. Tereza Adamová, Česká zemědělská univerzita v Praze (ČZU), Fakulta lesnická a dřevařská, katedra dřevěných výrobků a konstrukcí
Wood and the materials on its basis fulfil the requirements of an ever-evolving and accelerating society. In addition to naturally grown wood, wood-based materials are frequently used as a basic material for production of furniture and for building constructions as well. Looking at changes in waste management, a significant shift from the waste to the circular economy can be observed. The valuable raw materials are kept in the production cycle instead of landfilling or burning. Wood and wooden products can be efficiently separated in waste management, reused and recycled. The so-called wood waste – old furniture, wooden pallets, window and door frames, demolition wood, used lumber, bark and other wood residues can be reused in particleboard production. Particle board manufacturers in the Czech Republic have adopted progressive waste management and currently use 60% of recycled wood into particle boards. A completed life cycle analysis (LCA) of OSB demonstrates that replacing of 50% of natural fibres with recycled wood has significant environmental benefits. The objective is to push furthermore on effective legislation to promote waste material utilization and thus lead to a more sophisticated waste wood collecting.
Floors, Partition Walls, Surfaces

Environmental benefits of using recycled wood to produce agglomerated materials (Part 2)

14.5.2018 | doc. Ing. Milan Gaff, Ph.D., Ing. Kamil Trgala, Ph.D., Ing. Tereza Adamová, Česká zemědělská univerzita v Praze (ČZU), Fakulta lesnická a dřevařská, katedra dřevěných výrobků a konstrukcí
Wood and the materials on its basis fulfil the requirements of an ever-evolving and accelerating society. In addition to naturally grown wood, wood-based materials are frequently used as a basic material for production of furniture and for building constructions as well. Looking at changes in waste management, a significant shift from the waste to the circular economy can be observed. The valuable raw materials are kept in the production cycle instead of landfilling or burning. Wood and wooden products can be efficiently separated in waste management, reused and recycled. The so-called wood waste – old furniture, wooden pallets, window and door frames, demolition wood, used lumber, bark and other wood residues can be reused in particleboard production. Particle board manufacturers in the Czech Republic have adopted progressive waste management and currently use 60% of recycled wood into particle boards. A completed life cycle analysis (LCA) of OSB demonstrates that replacing of 50% of natural fibres with recycled wood has significant environmental benefits. The objective is to push furthermore on effective legislation to promote waste material utilization and thus lead to a more sophisticated waste wood collecting.
Low Energy Buildings

GHG Emissions of the Czech Building Stock and Potential for their Reduction through Energy Savings

8.7.2019 | Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
The paper presents results of a study on potential reduction of CO2 emissions of the Czech national building stock until 2075. The calculations were based on datasets provided by Chance for Buildings that modeled five different scenarios of energy savings in the Czech building stock that varied by the depth of the energy retrofitting measures and by the pace of their application. The results were compared to the carbon budget that was set in line with the objectives of the Paris agreement.
Low Energy Buildings

Energy Flexible Building

21.1.2019 | doc. Ing. Milan Ostrý, Ph.D., VUT FAST Brno
Paper deals with the definition of energy flexible building, its impact on the stability of the grid with the planned increasing share of energy from renewable sources and the possibility of using the heat storage capacity of building structures. Paper further analyzes the selected methodology for evaluation of the energy flexibible building and gives an example of thermally activated building structures.
Low Energy Buildings

SBToolCZ green building assessment methodology for school buildings

4.12.2018 | Ing. Jan Tripes, TZÚS Praha, s. p., pobočka České Budějovice
The article describes basic principles of the SBToolCZ green building assessment methodology stressing its up-to-date methods for school buildings. An example of a certified school is given. Renovation of this school was assessed and optimised by the SBToolCZ system which lead to the conversion into intelligent, zero energy building.
Wooden Buildings

Adhesion of paint films to weathered wood

9.9.2019 | Ing. Gabriela Slabejová, PhD., Technická univerzita vo Zvolene, Drevárska fakulta, Katedra nábytku a drevárskych výrobkov, Ing. Zuzana Vidholdová, PhD., Technická univerzita vo Zvolene, Drevárska fakulta, Katedra drevárskych technológií
Treatment of wood surfaces with various finish coating materials is recommended for long term protection of wood products exposed outdoor. Due to natural weathering, the colour and the surface roughness of uncoated wood is changed. However, in practice it can happen that wood in constructions has been weathered before to application of a finish. In this work, selected properties of sapwood and heartwood of pine (Pinus sylvestris, L.) surface such as surface roughness and adhesion of coating film were investigated on the surfaces of previous naturally weathered wood Two coating materials useable for wooden constructions in exterior conditions were used: dark brown polyurethane-based system and light brown oil-based surface treatment. The results of pull-off test for adhesion showed that the polyurethane coating film showed the weakest point in the pre-weathered layer of wood substrate and also at the wood/coating interface. The oil-based surface treatment had the weakest place inside the coating film or in the coating penetration layer in the wood substrate. Pre-weathering did not significantly affect the adhesion the coating film on wood. The result of the pull-off test for adhesion of both surface treatments was significantly greater on the heartwood surfaces than on the sapwood surfaces of the sound wood.
Wooden Buildings

Účinek vybraných forem energie a preparátů na bázi nanočástic na ochranu staveb před dřevomorkou domácí

20.5.2019 | Ing. Andrea Nasswettrová, MBA, Ph.D.,, Thermo Sanace s.r.o., Vědeckotechnický park profesora Lista, Brno, RNDr. Jiří Gabriel, DrSc.,, Mikrobiologický ústav AC ČR,v.v.i, doc. Ing. Jana Drbohlavová, Ph.D.,, VUT Brno, Fakulta elektrotechniky a komunikačních technologií, Ústav mikroelektroniky, Ing. Olga Grossová, Mgr. Karel Švec, Mikrobiologický ústav AC ČR,v.v.i.,, Ing. Evelína Polievková, VUT Brno Fakulta elektrotechniky a komunikačních technologií, Ústav mikroelektroniky, Ing. Hynek Kundera, Thermo Sanace s.r.o.
The aim of the article is to present the results of the research in the field of protection of wooden structures against the occurrence of domestic woodpecker (Serpula lacrymans L.). Two forms of energy, radiant heat and microwave heating were studied. A new nanoparticle preparation has been developed and its effect on inactivating the degradation effect of domestic woody was monitored. Also studied was the synergistic effect of various radiation shapes supplemented by the effect of nanoparticle selenium. The studied material became spruce wood as the most used building timber. The results are presented and described in the present article.
Wooden Buildings

Stability of Wall Panels with One-sided Board Sheating for Timber Structures

7.1.2019 | Ing. Jiří Celler, Ph.D., doc. Dr. Ing. Jakub Dolejš, ČVUT Praha, Fakulta stavební, katedra dřevěných a ocelových konstrukcí, Ing. Věra Hlavatá, ČVUT Praha, Fakulta stavební, katedra mechaniky
The subject of this paper is an experimental and numerical analysis of the stability of the wall panels with one-side board sheating. The reinforcement of the panel is provided by means of glued timber composite I-shaped element consisting of a web made of a wood-based desk embedded into flanges of solid timber. The mechanism of the behaviour of these panels, mode of the failure and reliable procedure to determine the buckling load-bearing capacity not been fully explored so far. The main aim of this project is to create reliable numerical model using experiments and parametric study for optimized design. Outcome of the work is a design model and dimension tables for one-side board sheating wall panels of light timber structures with a rib in the form of an I-stud.
ilustrační obrázek © Christian Delbert - Fotolia.comWooden Buildings

Application of clay in the construction of wood-based buildings in terms of increasing their fire protection

1.10.2018 | doc. Ing. Agnes Iringová, PhD., Žilinská univerzita v Žiline, Stavebná fakulta
Possibilities of application of clay in the construction of wood-based buildings in terms of increasing their fire protection – history, present. Requirements for fire resistance of outher sheating of wood buildings depending on their fire-height. Application of interior clay plasters in terms of optimization of indoor microclimate and fire protection of lightweight wall sheating in wooden houses in model solution.
Building Regeneration

Dopady opatrení hĺbkovej obnovy na spotrebu energie v bytovom dome

18.11.2019 | prof. Ing. Zuzana Sternová, PhD., Technický a skúšobný ústav stavebný, n.o., Bratislava, Ing. Roman Horečný, Technický a skúšobný ústav stavebný, n.o.
In 2011, Bratislava responded to the EU call for the FP7-ENERGY-SMARTCITIES-2012 Program and for participation in the EU-GUGLE international project “European cities serving as Green Urban Gate to Leadership in Sustainable Energy To Sustainable Energy”. The aim of the project is to achieve the concept of energy performance of buildings, ensuring the energy efficiency of the buildings themselves when using them and reducing the energy intensity within of the urban area where the building is located.
Building Regeneration

Stabilizing Repair of Historic Building

15.7.2019 | Ing. Jiří Strnad, Ph.D., VUT FAST Brno, Ústav betonových a zděných konstrukcí, doc. Ing. Zdeněk Bažant, CSc., VUT FAST Brno, Ústav betonových a zděných konstrukcí,
Old historic masonry structures are in many cases in a poor construction-static state. The repaired building showed a loss of horizontal and vertical joints, cracks and local defects of vaults, walls, ceilings, roofs and foundations. Therefore, rigid prestressed reinforced concrete foundations have been proposed and pretensioned rods located in the lower parts of the vault arches were installed.
Building Regeneration

Sanace nosného systému věžových částí objektu Trinity

10.6.2019 | doc. Ing. Miloš Zich, Ph.D., Fakulta stavební, Vysoké učení technické v Brně, Ing. Jan Nováček, Stráský, Hustý a partneři, Ing. Vladimír Paulička, PRO TP 06, Ing. Martin Benko, Metrostav Slovakia
In the administrative complex of the Trinity buildings in Bratislava, a part of the ceiling slabs collapsed in 2012. In connection with this event, it was necessary to verify the static effect of already built parts of the building, ie the stress and parts outside the actual fall were verified. According to the results of the recalculation, it was then necessary to design and carry out a number of demanding redevelopment of the reinforced concrete structure of the height parts of the building. This paper deals with the design and implementation of remediation of the tower's own supporting system.
Building Regeneration

Innovative methods for serial energy retrofitting of residetinal buidlings – examples from the Netherlands

20.8.2018 | Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
The paper describes actual trends in serial deep energy retrofitting of buildings in the Netherlands. A set of photographs presents several Dutch pilot projects of energy retrofitting of post-war family houses in Heerlen, Melick and Soersterberg to net zero energy level and of one multifamily residential building in Arnhem to nearly zero energy level. The retrofitting projects were made utilizing prefabricated thermal insulation wall modules with timber structural system (that included new windows) and prefabricated roof panels. All presented projects also featured replacement of energy sources and in case of the family houses also installations of photovoltaic systems replacing roof tiles.
Building Physics

Zdravé řešení akustiky interiéru pomocí zelených prvků

28.10.2019 | Ing. Bc. Jitka Peterková, Ph.D., doc. Ing. Jiří Zach, Ph.D., Ing. Magdaléna Michalčíková, Ph.D., Ing. Vítězslav Novák, Ing. Richard Slávik, Ph.D., VUT FAST Brno, Ústav technologie stavebních hmot a dílců, Ing. Dagmar Donaťáková, VUT FAST Brno, Ústav pozemního stavitelství, Dipl. Ing. Dr. techn. Azra Korjenic, TU Wien, Institute of Building Construction and Technology, Benjamin Raich, Němec s.r.o.
The paper deals with one of the possibilities of solving the problems of indoor acoustics. Very often interior acoustics have poor interior acoustics. There are many options for solving this problem, one of these options is the green elements built into the interior, which, among other things, have a positive impact on the psychological well-being of people living in the interior. As part of the research work in collaboration with the Faculty of Civil Engineering, Brno University of Technology and the Technical University of Vienna and the company Němec s.r.o. a green wall and green paintings were made into the classroom where the lecturers and students faced poor interior acoustics. The paper describes the effectiveness of these green elements applied in the lecture room in terms of indoor acoustics.
Parametrická štúdia tepelnej bilancie budovy, ilustrační snímek © Büros - Fotolia.comBuilding Physics

Parametric study of the thermal balance of the building due to the shading and transparency of the facade

22.10.2019 | prof. Ing. Ivan Chmúrny, PhD., Stavebná fakulta STU v Bratislave
Increasing the thermal insulation properties of walls, roofs, floors and windows has a positive effect on reducing heat loss and energy need for heating. However, when assessing the energy need for cooling in buildings with conditioned indoor environment, this tendency to increase the thermal insulation capability may lead to an increase the energy need for cooling, when measures to reduce heat gains by transparent structures are not applied.
Ilustrační obrázek © djama - Fotolia.comBuilding Physics

Tepelná ochrana budov – podstatné riešenie novej výstavby a obnovy budov

16.9.2019 | prof. Ing. Zuzana Sternová, PhD., Technický a skúšobný ústav stavebný, n.o., Bratislava
The gradual tightening of the value of the heat transfer coefficient of envelope building structures takes into account the requirements of EU regulations for improving energy performance of buildings, while respecting cost-optimal conditions. Standardized heat transfer coefficient requirements reflect the market development situation of construction products (especially windows). The provision of hygiene parameters, thermal comfort requirements and the energy use reduction requirements for heating from renewable sources are taken into account. The draft standardized requirements according to the consolidated text take into account a summary of the basic requirements for works, including the energy consumption of construction materials production..
Building Physics

Thermo-technical assessment of anchoring element for walls’ attached structures

29.8.2019 | Ing. Zdenko Malík, Ing. Kristina Fořtová, Ph.D., Ing. Kamil Staněk, Ph.D., Ing. Jakub Diviš, Ing. Martin Hataj, ČVUT Praha, pracoviště UCEEB, Ing. Robert Jára, Ph.D., doc. Ing. Petr Kuklík, CSc., ČVUT v Praze, pracoviště UCEEB
Nowadays, when the demands on the thermal insulation envelope of buildings are increasing, the importance of thermal bridges on the overall thermal loss of the envelope increases. Point thermal bridges are often neglected in the calculations but can lead to an increase in heat loss by an envelope of up to 35%. Significant point thermal bridges are, among other things, elements which ensure anchoring of structures protruding in front of the façade fulfilling the supporting function, since the main emphasis is placed on the bearing capacity of such an element. Several variants of anchoring systems with thermal bridges are available on the market. This paper deals with the thermal-technical assessment of the selected anchoring system and its experimental verification during loading in the climatic chamber.

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