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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 a compact ventilation unit with a heat pump in a family house

16.6.2020 | Ing. Radek Červín, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The subject of the research is a ventilation unit with a heat pump providing vacuum ventilation in a specific family house. The year-round energy balance of the operation was prepared from the obtained parameters. For a total heat loss of 5 kW, the seasonal heating factor SPF of the entire system was evaluated at the level of 2.5.
1 comment, 13.07.2020 13:38
Heating

Evaluation of heating systems for heating large spaces according to CSN EN 15316-2

25.5.2020 | Ing. Ondřej Hojer, Ph.D., KOTRBATÝ V.M.Z. spol. s r.o.
The article shows part of the evaluation of the energy performance of a large building according to CSN EN 15316-2: 2018 and especially how the advantage of different methods of heating changes with the height of the building. It also includes a more detailed specification of some of the descriptions in the standard of ambiguous inputs.
Heating

Heating of family house, bungalow type, energy class A1

29.4.2020 | Ing. Radovan Illith, PhD., SPP – distribúcia, a.s.
The disadvantage of the family one-storey bungalow is the larger built-up area and the cooled envelope and thus higher specific heat consumption for heating compared to a compact two-storey house. The author offers a comparison of variants of bungalow heating by Total cost of ownership (TCO) method in Slovak conditions.
17 comments, last 02.06.2020 10:23
Heating

Štúrovo - efficient district heating using geothermal energy and cogeneration of heat and electricity

13.4.2020 | Ing. Miroslav Havrlent, RACEN, spol. s r. o., Piešťany, Slovensko
Achieving the criteria set for effectively district heating will be a precondition for the development of central heat supply in the coming period. Heating companies are therefore looking for suitable alternative solutions. In this paper it is the view of the designer on a concrete example of the combination of the use of geothermal water and CHP.
Ventilating and Air-Conditioning

HEPA and ULPA class filters as a dangerous waste

22.6.2020 | Ing. Petr Polách, CSc., MBA, AI č.1000023 – technika prostředí staveb, interiAIR
Highly efficient HEPA and ULPA filters are accumulative (absorb particulate particles) and are therefore not intended for regeneration, but must be disposed of in an environmentally friendly manner. Filters are classified as hazardous waste and must be handled as such.
Ventilating and Air-Conditioning

Heat pump ventilation units, part 2. Economic evaluation

12.5.2020 | Ing. Jan Vitouš, Ing. Martin Kny, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budov
The authors describe the legislative requirements for ventilation and their possible technical solution. The mathematical model of the family house is used to evaluate the technical solutions of ventilation according to energy intensity. It is based on the economic evaluation of variants.
8 comments, last 30.05.2020 20:53
Ventilating and Air-Conditioning

Ventilation Units with Heat Pump, part 1. Energy Performance

4.5.2020 | Ing. Martin Kny, Ph.D., Ing. Jan Vitouš, ČVUT v Praze, Univerzitní centrum energeticky efektivních budov
The authors describe legislative requirements for ventilation and their possible technical solution. The mathematical model of the family house is used to evaluate the technical solutions of ventilation according to energy intensity. It is based on the economic evaluation of variants.
Ventilating and Air-Conditioning

Elektrostatické filtry a jejich hodnocení v souladu s ČSN EN ISO 16890

31.3.2020 | Ing. Petr Blasinski, Ph.D., doc. Ing. Aleš Rubina, Ph.D., Vysoké učení technické v Brně, Fakulta stavební, Ústav technických zařízení budov
Water and Drainage

Risks brought by unadvised water saving

27.4.2020 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Saving drinking and hot water without considering the context can jeopardize the hygienic parameters of the water and the function of the internal sewerage system. However, the investigation is necessary, and therefore the author states the risks and defines the limit beyond which the investigation is inappropriate without other measures.
1 comment, 27.04.2020 08:32
Water and Drainage

Recuperation of heat from sewerage in a dwelling house to heat cold water

6.4.2020 | Ing. Ján Šmelík, ENERGIA REAL, s.r.o, Košice
Based on the yearly operation of a specific device recovering heat from waste water discharged into the sewerage system for hot water preparation, the author documents the true potential of energy savings.
Water and Drainage

Standards, construction elements and experiences with ungerground and above-ground hydrants

6.4.2020 | Ing. Jaroslav Slavíček, VAG s.r.o.
Underground and above-ground hydrants have a special position within shut-off valves. They are used for various functions in water networks. Their importance in relation to the applicable standards is also reflected in the fact that they have a higher minimum service life in the number of cycles (1000 cycles) than conventional shut-off valves with manual control. At present, the usual criterion for their purchase is the price, the criteria of construction and useful elements in terms of long-term durability and reliability are not taken into account.
Water and Drainage

Smart water meters – remote reading of water consumption in Brno

30.3.2020 | Ing. Robert Šafář, Ing. Roman Palatin, Brněnské vodárny a kanalizace
One of the current strategies of the joint stock company Brněnské vodárny is the introduction of remote reading technology, which will fully incorporate cooperation with the city. A common approach to the development of the remote reading system is thus fulfilling a vision called Smart City. In this case, with the aim of covering all supply points in the city of Brno by remote reading of water consumption.
Renewable Energy

Cycling and battery life

1.9.2020 | Ing. Pavel Hrzina, Ph.D., FEL ČVUT v Praze, Katedra Elektrotechnologie
One of the important parameters that are monitored when choosing a battery is the so-called cyclic life. How is this parameter determined and what does it express?
2 comments, last 11.09.2020 19:22
Renewable Energy

Design of photovoltaic systems on flat surface with accent on most efficient use of technology and available space

23.7.2020 | Ing. Petr Wolf, Ph.D., Ing. Pavel Hrzina, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The design of PV systems with regard to the maximum annual yield (total energy obtained per unit of installed capacity) is slowly becoming a thing of the past. Systems with the adaptation of the production diagram to the local consumption consumption diagram and systems with better use of the space required for the installation of the PV array come to the fore.
Renewable Energy

Power Purchase Argreements as a renewable energy support

9.4.2020 | Mgr. Dana Stejskalová, Doucha Šikola advokáti s.r.o.
This article describes a long-term Renewables Power Purchase Agreement under which a consumer purchases renewable electricity directly from an electricity producer. Signing a renewables PPA ensures that the producer acquires the long-term revenue stream through the sale of energy and the costumer gets the fixed electricity price for the entire period of the contract.
3 comments, last 10.09.2020 09:45
Renewable Energy

Accumulator voltage – from cells to voltage systems of battery storages

26.3.2020 | Ing. Pavel Hrzina, Ph.D., FEL ČVUT v Praze, Katedra Elektrotechnologie
Baterries for different applications require different voltage. What conditions determine the voltage for given application and what voltages are specific for concrete battery technologies?
Electrical Engineering

Reliability testing of gas and vapours detectors and analysers

3.12.2019 | Miroslava Ševčíková, Vědecko-výzkumný uhelný ústav (VVUÚ) Ostrava Radvanice
In this article, we focus on fundamental element of primary protection – detection devices for registering the rise of hazardous concentrations of gases and vapors. We have chosen and described for each type of device and kind of detected gas basic tests that are necessary for ensuring their correct and reliable function.
Electrical Engineering

Lithium based accumulators

15.7.2019 | Ing. Jiří Tichý, UETE FEKT VUT v Brně
The article describes currently used types of lithium based accumulators. Basic principles, parameters, advantages and disadvantages are listed in the article.
4 comments, last 23.12.2015 17:09
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.
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.
10 comments, last 30.12.2019 01:04
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

Greenhouse gases of an apartment house

16.3.2020 | Ing. David Pálenský, ČVUT Praha, Fakulta stavební, Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
This is a case study of a multifamily residential building that has been environmentally assessed in terms of greenhouse gas (GHG) production using a simplified life cycle assessment (LCA) method. The results of total GHG emissions were compared to the emission limit value, which was set based on the climate objectives of the Paris Agreement and the scientific report The Emissions Gap Report. In response to the non-compliance with the emission limit, a number of emission-saving measures have been proposed and have been suitably designed into variants meeting the emission requirement.
Facility management

Greenhouse gases of an apartment house

9.3.2020 | Ing. David Pálenský, ČVUT Praha, Fakulta stavební, Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
This is a case study of a multifamily residential building that has been environmentally assessed in terms of greenhouse gas (GHG) production using a simplified life cycle assessment (LCA) method. The results of total GHG emissions were compared to the emission limit value, which was set based on the climate objectives of the Paris Agreement and the scientific report The Emissions Gap Report. In response to the non-compliance with the emission limit, a number of emission-saving measures have been proposed and have been suitably designed into variants meeting the emission requirement.
© Fotolia.comFacility management

Digitální kontrola kvality stavebních prací

28.1.2020 | Ing. Jaroslav Synek, Ph.D., ČVUT Praha, Fakulta stavební, katedra technologie staveb
The paper focuses on the possibilities and benefits of the introduction and use of digitization of information and processes in project management of construction projects with an emphasis on quality management in construction. This paper describes the application of digital quality control on the construction site. It summarizes the reasons, currently used procedures and their benefits for everyday construction practice.
Facility management

BIM potřebuje standardizaci

9.12.2019 | Ing. Štěpánka Tomanová, předsedkyně TNK152 Organizace informací o stavbách a informační modelování staveb (BIM)
The article describes the topics covered with the technical standards for BIM. It provides a list of already published technical standards, which are adopted in the CSN system as of 31 October 2019. The list of standards is completed with their basic purpose.

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

Repair of Load-bearing Structure of the Panel Building after Fire

21.9.2020 | Ing. Ivan Hollý, PhD., Ing. Iyad Abrahoim, PhD., Slovenská technická univerzita v Bratislave, Stavebná fakulta, Katedra betónových konštrukcií a mostov
The present experience has shown, that the most serious effect of the accidental load on prefabricated panel buildings in our conditions is a gas explosion. In addition to the explosion of gas, the effect of elevated temperature during a fire is also significant. During a fire, the mechanical properties of building materials may change. These may not return to their original value at the end of the temperature load. The article describes the design of repair of the load-bearing members the panel building after fire on the 11th floor of the panel system type T-06.
1 comment, 22.09.2020 08:08
Shell Construction

Prestressed Steel Tube Stayed Column with Two Crossarms

14.9.2020 | prof. Ing. Josef Macháček, DrSc., ČVUT v Praze, Fakulta stavební, Ing. Radek Píchal, Ph.D., ČVUT v Praze, Fakulta stavební, katedra ocelových a dřevěných konstrukcí
Article follows the previous treatise concerning prestressed steel tubes with just one crossarm (Machacek a Pichal [13]). A stayed column with two crossarms is investigated, while other parameters as those of tested and analysed stayed columns with one crossarm are identical. Critical loadings and decisive buckling modes of unprestressed stayed columns are solved by linear bifurcation. For prestressed stayed columns the analytical method is derived, which enables calculation of critical loading under an arbitrary prestress including the optimal one, resulting into maximal critical loading. The main study introduces geometrically, possibly also materially nonlinear analyses with initial imperfections, using software ANSYS. The nonlinear analysis is shown to be necessary even for critical loading of "ideal" stayed column, while for strength of "imperfect" stayed column, with given initial deflection, is absolutely essential. Finally are analysed impacts of material nonlinearity and numbers of crossarms, followed by practical design recommendations.
Shell Construction

Prestressed Steel Tube Stayed Column with One Crossarm

7.9.2020 | prof. Ing. Josef Macháček, DrSc., ČVUT v Praze, Fakulta stavební, Ing. Radek Píchal, Ph.D., ČVUT v Praze, Fakulta stavební, katedra ocelových a dřevěných konstrukcí
Article follows the previous general treatise concerning prestressed steel compression tubes with just one crossarm (Machacek [1]). This article deals with tests of stayed columns, numerical analyses and their evaluation. In the theoretical part the linear bifurcation analysis (2D LBA) to establish critical loads and buckling modes is presented, the geometrically nonlinear analysis to establish strengths of imperfect stayed columns (3D GNIA) and also the geometrically and materially nonlinear analysis to establish strengths of imperfect stayed columns made of stainless steels (3D GMNIA) are introduced. Numerical calculations employ software ANSYS and are validated by tests. Parametrically are investigated impacts of initial deflections, directions of buckling, material nonlinearities and the technique of the stays supports at crossarms. Results are summarized into practical recommendations.
Shell Construction

Study of Susceptibility of Cement Mortars and Concretes to Carbonation

10.8.2020 | doc. Ing. Michal Stehlík, Ph.D., VUT FAST Brno, Ústav stavebního zkušebnictví, Ing. Vlasta , Juránková. CSc., VUT FAST Brno, Ústav fyziky, prof. Ing. Jiří Adámek, CSc., VUT Brno, Fakulta stavební, Ústav stavebního zkušebnictví
Carbonatation of concrete (or possibly of cement grout) is a slow destructive process, which continuously causes the change of pH, the corrosion of reinforcement, up to the total loss of strength and cohesion of concrete. It seems, however, that the carbonatation process can be partially influenced by a composition of concrete mixture and by perfect dumping. Greater batches of cement, preferably portland cement, guarantee the best natural preservation of concrete. On the contrary, negative effects of carbonatation demonstrate themselves stronger in the worse dumped concrete and also in concrete with excess of batching water. Finding a suitable recipe for a concrete mixture together with a perfect processing technology lead to a significant prolongation of lifetime of concrete constructions exposed to invasive action of gaseous carbon dioxide.
Insulation, Roofs, Facades

Possibilities of organic fibrous insulators based on natural fibers for the production of vacuum insulation panels (VIP)

27.7.2020 | doc. Ing. Jiří Zach, Ph.D., Ing. Vítězslav Novák, VUT FAST Brno, Ústav technologie stavebních hmot a dílců, Ing. Martin Sedlmajer, Ph.D., Ing. Jan Bubeník, VUT Brno, Fakulta stavební, Centrum AdMaS
From the point of view of sustainable development in construction, the possibility of using easily renewable raw materials for the production of advanced thermal insulation materials currently represents an interesting way to effectively reduce the energy consumption of buildings. Insulators with ever-increasing thicknesses are being utilised in buildings; the use of these raw materials allows for the insulators’ production without the need for a substantial increase in CO2 emissions and energy consumption.
Natural fibres generally display very low thermal conductivity. Despite their relatively great thickness (in the case of technical fibres) these fibres are porous, and upon reducing pressure they show significant loss of thermal conductivity. Remarkably, it is the same in the case of materials based on glass fibres, which are used industrially in the production of vacuum insulators. When using natural materials as thermal insulators there is a common problem with their high sensitivity to humidity and consequent degradation of thermal insulating properties upon increasing their water content. In the case of using natural fibres for the production of vacuum insulators, these fibres are protected against humidity by a barrier foil that creates a vacuum insulation panel (moreover, the panel also always contains an active dryer), this is why their use in this field is so interesting.
Insulation, Roofs, Facades

Wooden Elements in a Condensation Zone

8.6.2020 | Ing. Hollý Ján, doc. Ing. et Palko Milan, Ing. arch. PhD., Ing. Martina Jurigová, PhD., Stavebná fakulta STU v Bratislave, Ústav súdneho znalectva, Ing. Adela Palková, PhD., Slovenská technická univerzita Bratislava, Stavebná fakulta, Katedra konštrukcii pozemných stavieb
Contractors tend to ignore design solutions to reduce the cost of construction. Change of materials, absence of building elements, adjustment of layer composition, application of cheaper alternatives – these are common situations in construction practice. In certain cases, these modifications are without consequences, but in such a situation it is necessary, among other things, to take into account the laws of physics. This article deals with the case in which the structure was replaced – instead of the reinforced concrete ceiling slab, the contractor chose a wooden structure. Wood has significantly different properties than reinforced concrete, so it is necessary to take into account several aspects such as statis, thermo-technical properties and last but not least – with whitch this article deals with – moisture conditions in the structure. The relationship of wood and moisture is specific, the article assesses a specific case of such a structure, lists the possible consequences and finally suggests the most appropriate solution – adjusting the composition of this particular ceiling structure to meet the requirements.
© style-photography.de - Fotolia.comInsulation, Roofs, Facades

Hledání cesty k řešení sporů o vady a poruchy ve stavebnictví

4.5.2020 | doc. Ing. Vladimír Tichomirov, CSc., LL.M., Inženýrská, expertní a znalecká kancelář Brno
Possible defects or failures in the construction industry can be solved in many cases by mutual agreement of both parties. Unfortunately, in the event of an inability to reach an agreement, the dispute usually escalates into court proceedings, which are, however, virtually lengthy, and in the course of time even considerably costly and often unsatisfactory at the end. However, there is also a faster, less costly and usually resulting in a constructive outcome, and that is cooperation with experts in the legal and technical fields - the so-called mediation route.
Insulation, Roofs, Facades

Drenáže a nová směrnice zabývající se úpravou hydrofyzikálního namáhání stavby vodou

30.3.2020 | Ing. Antonín Žák, Ph.D., DEK a.s. - Vedoucí výzkumu a vývoje centra DERIC, ČHIS - Člen výboru, Ing. Luboš Káně, Ph.D., DEK a.s. - Technický ředitel, ČHIS - Předseda
Drainage systems are usually designed in combination with waterproofing systems, as a part of the concept of protecting the building envelope against negative effects of groundwater. The main function of a drainage system is to reduce the water pressure on the building structure. Although, drainage systems are one of the oldest waterproofing techniques, there are still many questions about effectiveness, reliability and lifetime. Based on many suggestions and experience through practice, the new regulation ČHIS: 06 was published by Česká hydroizolační společnost (Czech Waterproofing Society). This regulation is focused on designing drainage systems for reducing the groundwater pressure acting on underground structures of buildings.
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

Design of a contact floor made of ultralight concrete based on foam glass

20.7.2020 | doc. Ing. Jiří Zach, Ph.D., VUT FAST Brno, Ústav technologie stavebních hmot a dílců, Ing. Jan Bubeník, Ing. Martin Sedlmajer, Ph.D., VUT Brno, Fakulta stavební, Centrum AdMaS, Ing. Jan Cimburek, Refaglass Příbram
Floor construction is assessed within the thermal field by the heat transfer coefficient and surface temperatures, and in the acoustic field particularly from the point of view of airborne and impact soundproofing. When using ultra-light concrete for the construction of flooring there are unique parameters to consider. Within the contribution, the development occurred of an ultra-light concrete daub that achieved this minimal weight due to an aggregate product based on foam glass. This ultra-light concrete displays a very good ratio of mechanical performance to thermal insulation properties. As a result of these excellent thermal insulation properties, and the design of a concrete daub without joints, the formation of thermal bridges in floor construction can be eliminated.
Floors, Partition Walls, Surfaces

Komentáře a diskuse k normě ČSN 74 4505 Podlahy (2. část)

29.6.2020 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec, Ing. Petr Tůma, Ph.D., Betonconsult s.r.o. | Podlahy Profi
Together with the professional journal Podlahy, we have prepared a new series, where the authors get acquainted with the basic standard ČSN 74 4505 Podlahy; Common provisions, and subsequently also with other standards that are important for the area of floors, and also respond to the comments of opponents and reviewers. The second part of the series introduces the basic technical requirements for floor structures as specified in ČSN 74 4505. The most important parameters; requirements of the standard are explained in more detail so that it is clear how they are defined and what their specific physical / practical significance is.
Floors, Partition Walls, Surfaces

Standard ČSN 74 4505 – comments and discussion (part 1)

22.6.2020 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec, Ing. Petr Tůma, Ph.D., Betonconsult s.r.o. | Podlahy Profi
Together with the professional journal Podlahy, we have prepared a new series, where the authors get acquainted with the basic standard ČSN 74 4505 Podlahy - Common provisions and subsequently with other standards that are important for the floor area, and also respond to comments from opponents and reviewers. The first part of the series describes the most important provisions of ČSN 74 4505 in an annotated form.
1 comment, 23.06.2020 08:36
ilustrační foto: redakceFloors, Partition Walls, Surfaces

Komentáře a diskuse k obsahu normy ČSN 74 4505 Podlahy (úvod do seriálu)

15.6.2020 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec, Ing. Petr Tůma, Ph.D., Betonconsult s.r.o. | Podlahy Profi
Together with the professional journal Podlahy, we have prepared a new series where the authors will get acquainted with the basic standard of ČSN 744505 Podlahy; Common provisions, and subsequently also with other standards that are important for the area of floors, and will also respond to the comments of opponents and reviewers.
1 comment, 15.06.2020 13:32
Low Energy Buildings

Family House for Protected Landscape Area Krivoklatsko

25.5.2020 | prof. Ing. arch. Ing. Zuzana Pešková, Ph.D., ČVUT Praha, Fakulta stavební, katedra architektury
The Architecture and Urban Planning Committee of Protected Landscape Areas in Central Bohemia Region has to deal with low-suitable new family houses architecture design very often. The recommendations for buildings were written to preserve typical architecture form. Due to the passive standards coming be ordinary used in family house design, Administration of the Krivoklatsko PLA initiated the cooperation with Faculty of Civil Engineering CTU in Prague to try find new design for Krivoklatsko PLA. Architecture and Building Engineering students worked out design of new family houses as their Bachelor projects. The goal of this paper is to present student projects as an inspiration for builders and evaluate the usage of new shapes and materials in the design suitability context.
© Fotolia.comLow Energy Buildings

Problematika výstavby a energetického hodnocení budov s téměř nulovou spotřebou energie v roce 2020

18.5.2020 | doc. Ing. Petr Horák, Ph.D., VUT v Brně, Fakulta stavební, Ústav technických zařízení budov
The article describes new changes in legislation dealing with the energy performance of buildings in 2020. Attention is paid to the phenomenon of buildings with almost zero energy consumption. Using a practical example, it describes a method of assessing the energy performance of a normal new building and a building with almost zero energy consumption.
1 comment, 21.05.2020 09:39
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.
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

Reconstruction of Historic Freestanding Walls in the Game-park Hvězda

24.8.2020 | doc. Ing. Eva Burgetová, CSc., Ing. Denisa Boháčová, ČVUT Praha, Fakulta stavební, katedra pozemních staveb
The aim of the study was to determine the functional reliability of the historic wall of the Hvězda summer house and to assess its applicability. The article presents the possibilities of freestanding wall renovation design using optimal technologies, analysis of solution proposals and evaluation of risk factors. The actual design of the renovation was preceded by a detailed structural survey. At the end of the article, the course of implementation work is described, including the selected material solution of restoration. The Klokner Institute of the Czech Technical University participated in the material analyses and the renewal proposal was consulted with the National Heritage Institute.
Building Regeneration

Tools for Revitalization and Rehabilitation of Brownfields

1.6.2020 | Ing. arch. Jiří Kugl, ČVUT Praha, Fakulta stavební
This paper will focus on the question of how we can work with brownfields and it will deal with tools that enable the revitalization and rehabilitation projects in the area. Tools can be divided, for example in terms of spatial planning and urban design, from an environmental perspective, from the perspective of cultural heritage protection and from the perspective of investment opportunities. The result is that the issue of brownfields is handled by numerous institutions and instruments. The aim of this paper is to identify, classify and analyze these instruments. Paper will study instruments from other countries with long-term experience with this issue (eg. France, Great Britain, USA, Germany, Denmark) and analyse the feasibility of their implementation in the Czech Republic and their contribution. Because this theme is a very complex one, this paper is mainly focused on urban planning tools, economic tools (incentive and penalty) and building tools (designed to uphold the intentions of the municipality or the state by building mainly transport and technical infrastructure).
Building Regeneration

Selected Problems of Static Analysis of the Panel Buildings

13.4.2020 | Ing. Ivan Hollý, PhD., Ing. Iyad , Abrahoim. PhD., Slovenská technická univerzita v Bratislave, Stavebná fakulta, Katedra betónových konštrukcií a mostov
The mass construction of apartment buildings using the technology of large-format prefabricated prefabricated elements in the former Czechoslovakia took about 40 years. The lifetime of these buildings is approaching their planned value. A common problem of prefabricated buildings is the creation of new openings in load-bearing structures without prior expert appreciation. The important details of the joints of the support elements have changed not only between the individual assemblies, but also during the development of the particular assembly. The article describes some problems of load-bearing structures of prefabricated buildings, which designers have to consider in their assessment.
Building Regeneration

Non-professional Intervention in the Load-bearing Structure of Panel Buildings

6.4.2020 | Ing. Ivan Hollý, PhD., Ing. Iyad , Abrahoim. PhD., Slovenská technická univerzita v Bratislave, Stavebná fakulta, Katedra betónových konštrukcií a mostov
The construction of precast hous consists of prefabricated concrete walls and floor slabs. These elements through joints form rigid spatial (so-called box) load-bearing system. The prefbricated elements of this system were designed for certain layout and static possibilities of the panel system. All additional interventions in the load-bearing structure must be thoroughly investigated. If necessary, it is also necessary to propose a suitable way of strengthening the weakened parts of the load-bearing system.
Building Physics

Acoustic of Multi-layer Building Structures

17.8.2020 | Ing. Jaroslav Hejl, ČVUT Praha, pracoviště UCEEB
In modern building systems, sound insulation of walls is often made of multi-layer structures. This article deals with the acoustic operation of such structures and discusses the importance of proper implementation. It also warns against limited sound insulation at low frequencies, which is often not given enough attention. Software for calculating sound insulation - INSUL - was used to compare the acoustic behavior of structures and for simulations.
Building Physics

The Daylight Factor Dw (%), distance angle and area without daylight

13.7.2020 | doc. Ing. Jan Kaňka, Ph.D., člen TNK 76 Osvětlení, ČKAIT Praha
The article pays attention to the importance of daylight and sun exposure of apartments for public health. The daylight of apartments must be given the same attention as the daylight of workplaces and schools. The way in which the daylight factor Dw (%) of the exterior window plane was introduced into the Czech technical standardization as a criterion is described. The results of a study regarding daylight of living rooms in connection with the limit values of this factor and in connection with the so-called distance angle and window area determined as 1/10 of the floor area of the living room are presented.
4 comments, last 20.07.2020 10:04
© Fotolia.comBuilding Physics

Tepelné zisky vo výpočte letného prehrievania budov

10.2.2020 | Ing. Radoslav Ponechal, PhD., Stavebná fakulta Žilinskej univerzity v Žiline, katedra Pozemného staviteľstva a urbanizmu
The deterioration of thermal comfort during the hot summer days has been troubling occupants of apartment buildings for several years, and it is not expected to be improved soon according to global climate change. It is appropriate time to start deal with the question of the correct prediction of the effects of hot days series on indoor environments in non-conditioned areas seriously. In the simulation models created for this purpose, the correct daily schedule of indoor heat gains plays an important role. The behavior of the building occupants varies, so there are many possibilities for design the schedule. In this article there is an example of a schedule for a model apartment building, compiled on the basis of previous practices as well as more recent statistical studies from abroad. The contribution also shows differences in simulation results while we apply different ways of the internal heat gain schedule in the apartment.
© Konstantin Yuganov - Fotolia.comBuilding Physics

Calculation of Summer Overheating in Buildings

3.2.2020 | Ing. Radoslav Ponechal, PhD., Stavebná fakulta Žilinskej univerzity v Žiline, katedra Pozemného staviteľstva a urbanizmu
The issue of calculating summer overheating is less known in the field of civil engineers, although it is becoming more and more current. In the first part, the paper deals with current standard requirements in this area. The following is an example of computational programs. It further addresses the problem of climatic boundary conditions and other significant factors affecting the result of the calculation of summer overheating such as ventilation and internal heat gains. The second part of the paper will be devoted to the impact of the method of internal heat gains application on simulation results. The paper concludes with a model daily schedule of internal heat gains for the dwelling unit, created from the taken over actual statistical measurements.
1 comment, 03.02.2020 18:28

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