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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

Ventilating and Air-Conditioning

Minimum efficiency of heat recovery in ventilation with regard to energy balance and economic return

28.12.2020 | Ing. Daniel Adamovský, PhD., ČVUT v Praze, Fakulta stavební, Katedra technických zařízení budov, Bc. Martin Cakl, ČVUT v Praze, Fakulta stavební Katedra technických zařízení budov, Časopis Vytápění, větrání, instalace | Vytápění větrání instalace, 2020-3
The minimum efficiency required for the efficient use of the heat exchanger in the equal pressure ventilation system of a family house is determined by the ratio of energy for fan operation and preheating to recovered energy, the balance in terms of energy and primary energy prices and economic return.
Ventilating and Air-Conditioning

Analysis of the causes of complaints about the quality of indoor air in an apartment building with central ventilation

26.10.2020 | prof. Ing. Karel Kabele, CSc., Ing. Zuzana Veverková, Ph.D., ČVUT v Praze, Fakulta stavební, Katedra technických zařízení budov | Vytápění větrání instalace
The paper focuses on the issue of one of the parameters of the indoor environment, which is the quality of indoor air. The new construction of an apartment building with controlled ventilation in the nZEB standard outlines the possible causes of perceived deteriorating air quality, but also the possible consequences associated with the construction of buildings with almost zero energy consumption in this area.
1 comment, 26.10.2020 12:14
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
© Miroslav Beneda - Fotolia.comWater and Drainage

Process of Long Denitrification Test

26.5.2021 | Ing. Kristína Pániková, VUT FAST v Brně, Ústav chemie
Denitrifying bioreactors are used to remove nitrates from surface runoff in agricultural areas and thus to prevent them from entering surface water bodies. The course and rate of the denitrifying process is influenced by many factors. One of the most important ones is the inflow water quality, as the water can be contaminated also by pollutants such as pesticides.
We have paper proposed and optimized a methodology for the long-term testing of the effect of pesticides on the denitrification process. This batch test was performed to evaluate the inhibition of the denitrification rate. Apart from optimizing the nitrate dosage method, we determined as well their optimal dose (15 mg/l) and also the most suitable NaHCO3 concentration in the deionized water (0.5 mg/l).
Water and Drainage

Ensuring Required Temperature of Cold Potable Water in Water Supply System Inside Buildings

23.4.2021 | Ing. Dominika Macková, doc. Ing. Peráčková Jana, PhD., Slovenská technická univerzita v Bratislave, Stavebná fakulta, Katedra Technických zariadení budov
The paper deals with the requirements of the quality of potable cold water in water piping system inside buildings. The contribution focuses on temperatures, which should be provided in the water piping system and describes the main risks and factors influencing the temperature of cold water. The paper shows the basic measures and possible solutions of the problem of ensuring the sufficient potable water exchange in buildings. In buildings, there usually are not ideal conditions for ensuring the hygiene of potable water, the resulting hygienic risks can be reduced using the right technical solution.
Water and Drainage

Service life of fixed water fire extinguishing equipment pipes

13.4.2021 | Ing. Pavel Rybář, předseda stálé pracovní skupiny Požární prevence a zástupce České asociace pojišťoven ve Výboru evropských pojistitelů CEA
The second part deals with the properties of plastic pipes and their service life, describes CVPC pipes, PR-R pipes, ESC mechanism, chemical degradation, mechanical degradation, hinge spacing, inspections of old installations, certification of pipes, pouring into concrete, corrosion prevention measures, lowest criterion prices and conditions VdS CEA 4001.
Srdcem vakuového systému odvodnění střech je střešní vtok, foto NicollWater and Drainage

Change of Water Outflow Depending on the Shape of the Siphonic Drain

1.4.2021 | Ing. Daniel Fučík, UT FAST Brno, Ústav vodního hospodářství obcí, Ing. Jan Ručka, Ph.D., VUT FAST Brno, Ústav vodního hospodářství obcí
The article describes the change of water outflow depending on the shape of the siphonic drain. For several selected shapes of siphonic drains, the hydraulic capacity was measured depending on the height of the water on the board, which simulates the roof and is located in the storage tank. An outflow curve was plotted for each inlet, from which the maximum hydraulic capacity is evident, which is based on the boundary conditions of the laboratory measuring device. For comparison purposes, photographs of water flow in the pipeline and above the level of the simulated roof were recorded. Recording was performed for all measured drains and also for each height of water.
Renewable Energy

What should you know before installing home solar PV?

14.4.2021 | Mgr. Jiří Zilvar, redakce
How much electricity does a PV panel produce? What is solar inverter good for? When your solar PV does not pay off? How long does the installation take? We will answer these and many other practical questions in this article.
Renewable Energy

Rooftop photovoltaics - how does it work and what to expect from it?

13.4.2021 | Mgr. Jiří Zilvar, redakce
Are you considering installing a solar power plant on your own home or business, and haven't been interested in this technology? Here you will find basic information.
1 comment, 16.04.2021 13:46
Renewable Energy

Skladování elektřiny prostřednictvím tepla aneb Carnotovy baterie 2. díl – projekty a technologie ve světě a v ČR

14.1.2021 | Vít Bašta, Jan Špale, Miroslav Rathan, Martin Hofman, Michal Kasan, Václav Novotný, České vysoké učení technické v Praze, Fakulta strojní, prof. Ing. František Hrdlička, CSc.
The article focuses on Carnot batteries i.e. the electricity accumulation systems using heat storage. This second part brings a global overview of specific technologies, projects and in the end opportunities for applications in the Czech Republic.
4 comments, last 17.01.2021 10:51
Electrical Engineering

Fiber-optic FBG Sensors

25.1.2021 | Ing. Radim Šifta, Ph.D., NETWORK GROUP, s.r.o.
The paper describes special types of fiber optic point sensors based on FBG (Fiber Bragg Grating) and FP (Fabry-Perót) structures. First part of the paper deals with principle of FBG and FP and their exposition. Next part is focused on different types of FBG and FP sensors and principle of interrogation units. Finally practical examples of use are listed.
Electrical Engineering

Fiber Optic Sensors

20.1.2021 | Ing. Radim Šifta, Ph.D., NETWORK GROUP, s.r.o.
The paper deals with special types of sensors that use optical fibers to measure various non-electrical quantities. The introduction describes the principle of light transmission in optical fibers and their applications. Main part is focused on fiber-optic sensors and their dividing. Special attention is paid to the distribution sensory systems and their practical application.
Electrical Engineering

Zásahová činnosť hasičov pri požiaroch alebo dopravných nehodách elektromobilov

7.6.2020 | Ing. Petr Tánczos, PhD., Okresné riaditeľstvo HaZZ v Komárně, Mgr. Bc. Viktória Sláviková, ROBUSTECH Komárno, Ing. Zoltán Tánczos, PhD., Okresné riaditeFstvo HaZZ v Galante, doc. Ing. Mikuláš Monoši, PhD., Žilinská univerzita v Žiline, Fakulta bezpečnostného inžinierstva

Provozní prohlídky výtahů

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

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.

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

Facility management

Structure of Non-graphical Data for the Use of LCA in BIM: a Case Study

16.5.2021 | Ing. Michal Brandtner, Ing. Adam Boháček, VUT FAST Brno, Ústav technologie, mechanizace a řízení staveb
The article deals with the data structure for the purpose of Life Cycle Assessment (LCA) of buildings using the Building Information Model (BIM). LCA is a method that can be used to demonstrate the suitability of proposed materials, structures, or buildings in terms of their whole life cycle and its environmental impact. For the LCA evaluation it is crucial to obtain life cycle inventory (LCI) input data. The aim of the article is to define a BIM data structure for LCI purposes. The new methodology is based on standardization of non-graphic information model data structure called SNIM. Advantages of the proposed methodology have been demonstrated on the case study. These results are useful for expanding the BIM model with new data necessary for further LCA calculations.
© Fotolia.comFacility management

Importance of the 3D BIM Model of the Geotechnical Structure and Ground

19.4.2021 | prof. Ing. Ivan Vaníček, DrSc., Ing. Daniel Jirásko, Ph.D., ČVUT v Praze, Fakulta stavební, katedra geotechniky
Very quick process of digitalization in civil engineering is progressing also in the branch of geotechnical engineering. BIM is a part of this process. Mutual interconnection of the 3D model of ground with the 3D model of the geotechnical structure can help to give more clear view on the interaction of this structure with ground. However, at the same time it makes possible better control for all participants of the construction process, particularly if all conditions of this mutual interaction are fulfilled. Whether the main aim of the construction process – that the care devoted to the individual phases of the structure design and execution correspond to the risk with which this structure and ground are connected. Within this context a closer specification of the Eurocode 7 of the second generation will be specified, as it counts with different models.
© fotolia.comFacility management

Dlouho očekáváné nové vyhlášky o energetickém auditu a o energetickém posudku jsou v platnosti

Facility management

Basics of the Monthly Method of Calculating the Energy Demand for Heating and Cooling Indoor Spaces

22.3.2021 | doc. Ing. Petr Horák, Ph.D., VUT v Brně, Fakulta stavební, Ústav technických zařízení budov
The article deals with the principles of monthly calculation of heat demand for heating and cold for cooling according to ČSN EN ISO 52 016-1. The article clearly presents the individual calculation mechanisms for the needs of energy specialists and the professional public.


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

Latest reviewed editorial research papers in the field of construction

Hotel Evropa v PrazeShell Construction

Deformation Monitoring of Foundation Pit of the Hotel Evropa in Prague

14.6.2021 | doc. Ing. Jan Masopust, CSc., ČVUT Praha, Fakulta stavební, katedra geotechniky
The paper deals with the monitoring of deformations during the completion and reconstruction of the Hotel Evropa in Prague. Part of the implementation design documentation was the detailed design of geotechnical monitoring of deformations of the foundation pit. This article presents the main features of the measurement outputs in the form of the vertical and horizontal deformations. Monitoring is one of the most extensive and detailed of all that has ever been implemented in our republic, both in terms of its scope and its duration.
Shell Construction

The Demolition of the Transgas Buildings and the New Projects above the Vinohrady Tunnels

7.6.2021 | prof. Ing. Jiří Barták, DrSc., ČVUT v Praze, Fakulta stavební, katedra geotechniky
After the demolition of the brutalist Transgas building on Vinohradská street in Prague, whose buildings were situated above the historic Vinohrady tunnels II and III, the Vinohradská Administrative Center and the completion of building no. 345 “Above the Museum” will be built. Both buildings have a foundation joint immediately above the lining of the existing tunnels. The paper describes the main phases of construction, the character and size of the deformation affecting the stone block lining of tunnels.
© imfotograf - Fotolia.comShell Construction

Hygroscopic Properties of Spruce Wood

1.6.2021 | Ing. Petra Schůtová, Ing. Kamil Staněk, Ph.D., Ing. Jan Richter, ČVUT v Praze, pracoviště UCEEB
In simplified engineering calculations, the thermal-technical properties of wood are considered to be constant, but in real conditions they are moisture-dependent. This paper deals with the long-term measurement of absorbency at different initial and boundary conditions for the formulation of the coefficient of liquid water transport in wood for advanced computer modelling. A measurement procedure was designed to eliminate the effect of moisture transport in the measurement of water capillary uptake during partial immersion.
© Fotolia.comShell Construction

Options for Use of Glass Recyclate from Photovoltaic Panels for Concrete Masonry Units

31.5.2021 | doc. Ing. Michal Stehlík, Ph.D., Mgr. Jana Knapová, Ing. Vojtěch Kostka, VUT FAST Brno, Ústav stavebního zkušebnictví
The paper deals with the possibilities for use of glass recyclate from photovoltaic panels for concrete masonry units. It compares partivular recipes and its physical and mechanical properties with the main focus on the compressive strength. It then compares the values of these recipes with the values of commonly used composite materials for masonry units without recyclates.
Insulation, Roofs, Facades

Leaks in Basement Areas

12.4.2021 | prof. Ing. Peter Turček, PhD., Stavená fakulta STU, Bratislava, Katedra geotechniky
The paper offers an overview of the performed analyses, which evaluated the leakage into underground garages in the densely built-up area of the Prague city centre. Only after a comprehensive reassessment of geological conditions, the project and other available information was it possible to determine the probable causes of leakage into large underground parking spaces.
1 comment, 22.04.2021 00:49
Insulation, Roofs, Facades

Determination of Shear Charactristics of Thermal Insulation Products for ETICS

23.11.2020 | Ing. Miroslav Procházka, Technický a zkušební ústav stavební Praha s.p., pobočka Brno
This paper deals with the test results of shear characteristics of thermal insulation boards based on MW with longitudinal orientation of fibres of thickness 200 mm and more according to ČSN EN 13162+A1, documents serious faults in test procedure according to current ČSN EN 12090, reasons included, and proposes possible way of their solution.
Insulation, Roofs, Facades

Analysis of the Current State as a Basis of Prediction the Further Life-time of the Flat Roof

10.11.2020 | doc. Ing. Vladimír Tichomirov, CSc., LL.M., Inženýrská, expertní a znalecká kancelář Brno
In the expert business, the usual requirement is to find a possible fault, its cause and a proposal for how to eliminate it. More and more often, however, in expert practice I encounter the requirement to simultaneously assess the current state of the flat roof and especially the waterproofing layer and comment on its possible further functionality and durability.
Windows, Doors

Effect of the Chosen Parameters on Stress in Bolted Connection in Glass

26.4.2021 | Ing. Lucia Ondrušková, Slovenská technická univerzita, Stavebná fakulta, Katedra kovových a drevených konštrukcií
Increased stresses occur near the supports of glass structures, which can be decisive for design of glass member. Recommendations for minimum distance of bolted connection from the edge can be found in current standarts. For verification of details are used FE-models. Influence of the edge distance and material thickness on the maximum stress value at the edge of the hole in glass loaded in its plane is compared in this paper.
Windows, Doors

The Anual Energy Balance of the Windows: the Case Study

22.3.2021 | Ing. Libor Šteffek, Ph.D., Ing. Jiří Kalánek, Ph.D., VUT FAST Brno, Ústav pozemního stavitelství, prof. Ing. Milan Ostrý, Ph.D., FAST VUT v Brně, Ústav pozemního stavitelství
The paper deals with the energy balance of windows for different combination of glazing parameters in connection with their orientation. Sum of solar gains through the transparent surfaces of a building envelope depends mainly on the size, their orientation and the g-value. Large glazed surfaces with correct orientation ensure large solar gains, but they are also the weakest part of the thermal isulating building envelope.
The influences of various U-value (Ug) and g-value of glazing on the energy performance of selected passive house were calculated by the use of computer simulation.
© Fotolia.comWindows, Doors

Elements of Building Structures from Secondary Raw Materials

21.12.2020 | Ing. Radim Smolka, Ph.D., Ing. Tomáš Petříček, Ph.D., Ing. et Petr Kacálek, Ing. Ph.D., FAST VUT v Brně
Panels for openings in structures have always been an essential and integral part of buildings. Their importance in terms of a building´s functionality was not recognised. However, the general view on this issue has changed from focusing on big planar segments and critical details to sub-elements of these structures. This does not only focus on the forms of connecting joints but also on the supporting systems that keep the panels in the right position and ensure they function properly. One of the most strained segments is the threshold structure, especially the entrance door threshold structure. It is the part where substantial defects in construction occur in terms of waterproofing, as well as in the static, thermal and technical functions thereof. In conventional buildings, this problem is solved by pulling the floor structure under the entrance door structure and subsequently covering it with waterproofing material. This system cannot work effectively over the long term so local defects occur. A proposal is put forward to solve this problem by installing a sub-threshold door coupler made of composite materials. The coupler is designed so that its variability complies with the required parameters for most door structures on the European market.
Windows, Doors

Údržba kování

24.3.2020 | Ing. Roman Šnajdr, SIPRAL a.s., člen TK ČKLOP | Česká komora lehkých obvodových plášťů (ČKLOP)

Floors, Partition Walls, Surfaces

Komentář k normě ČSN 74 4505 Podlahy – společná ustanovení (6)

17.5.2021 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec
Together with the professional magazine Podlahy Profi, we have prepared a series where the authors get acquainted with the basic standard ČSN 74 4505 Floors - Common provisions and subsequently with other standards that are important for the floor area and respond to comments from opponents and reviewers. The fifth part is devoted to another chapter of the ČSN 74 4505 standard, entitled Floor testing.
Floors, Partition Walls, Surfaces

Komentáře a diskuse k obsahu normy ČSN 74 4505 Podlahy (4. část)

5.4.2021 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec
© Fontanis - Fotolia.comFloors, Partition Walls, Surfaces

Environmentálne zaťaženia pojazdných plôch garáží a možnosti predĺženie ich životnosti

5.1.2021 | prof. Ing. Juraj Bilčík, PhD., prof. Ing. Vladimír Benko, PhD., Stavebná fakulta STU v Bratislave, Katedra betónových konštrukcií a mostov
The subject of the paper is the evaluation of the aggressiveness of the underground garage environment and the possibilities of secondary protection of mobile surfaces to increase their durability. The environment of the collective garage is extremely aggressive, especially in terms of corrosion of steel reinforcement in the reinforced concrete ceilings of mobile surfaces. Increased humidity and CO2 concentration, the presence of chlorides and cracks shorten the passive and active stage of corrosion of the concrete reinforcement of the running surfaces. Early application of the coating system provides effective and economical protection to extend their life.
© James Thew - Fotolia.comFloors, Partition Walls, Surfaces

Industrial Floors – Effects on Quality

23.11.2020 | prof. Ing. Rudolf Hela, CSc., Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců
The paper deals with the issue of emerging defects and failures in the construction of industrial floors in relation to concrete technology. The effects of deficiencies in concrete recipes on the occurrence of defects or failures are described, as well as the effects of treatment of the finished structure, laying of concrete and methods of its compaction.
ilustrační foto: Main Point Karlín © TZB-infoLow Energy Buildings

Environmental Certification of Buildings - the Situation in the Czech Republic

30.4.2021 | Ing. Zuzana Mrňová, VUT FAST Brno, Ústav stavební ekonomiky a řízení
A responsible approach to the environment is not only related to corporate ecology, but is also increasingly reflected in the design and construction of buildings, which is closely related to the concept of sustainable construction of buildings. With the development of sustainable construction, the need arose to evaluate buildings and their impact on the environment. For this reason, environmental certifications of buildings have been developed, which assess how a building affects its surroundings during its life cycle.
The aim of this article is to find out which environmental certifications exist in the world and which of them are most often used in the Czech Republic. Finally, the certifications are compared and their main differences are described.
ilustrační obrázek © starush - Fotolia.comLow Energy Buildings

Stavebně-energetické koncepce budov ve společenských souvislostech

8.2.2021 | prof. Ing. Jan Tywoniak, CSc., ČVUT Praha, pracoviště UCEEB | Dřevo&Stavby Profispeciál 2020
© Christian Delbert - Fotolia.comWooden Buildings

Complex Wood Based Houses Market Analysis

22.5.2021 | Ing. Tomáš Hrdlička, VUT v Brně, Ústav soudního inženýrství
It was finished 18 390 houses in the Czech Republic. Houses are the most frequent finished type of buildings. The share of construction of brick houses is 83.1% and for wood-base houses its 14.9%. Database of 1520 bids for houses was completed and how what is typical Czech house. It is single floor brick house with sloped roof. The heating system is compiled by electric heater and radiators. Also house market analysis was made. 631 sold houses was examined in the period 2017-2020 in Brno-venkov district, Czech Republic. Only 1.3% wood-based houses was detected.
Wooden Buildings

Použití přírodních stavebních materiálů v konstrukcích stájových objektů

1.11.2020 | Ing. arch. Lucie Pohanková, Ph.D.
The use of local and traditional natural building materials in the construction of new stable buildings should not only be associated with the architecture of organic farms, but should become a matter of course. The utility of the form of stable buildings, subordinated to the economy and function as it has in the recent past, should not become a dogma. New innovative stable projects made of natural materials from the architectural offices Localarchitecture, Gujan & Pally (CH) or architects I. Kalteneger and Hermann Kaufmann (A) submit to the "genius loci" and revive the otherwise boring appearance of stable buildings. This creates buildings that are kind to stabled animals and delight the individual's eye.
Wooden Buildings

Possible Use of Cement Adhesives in Timber Structure

19.6.2020 | Jiří Patloka, Erika Kratochvílová, Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie, mechanizace a řízení staveb
The unfavourable effects of the weather on unprotected wood and timber products can cause changes to the mechanical and chemical properties of the wood, and if unchecked can do irreversible damage. The sheathing of wooden buildings must always be supplemented with surface treatments, and in a large number of cases a contact thermal insulation system is used. The paper presents research focused on the possibility of using a commonly used cement adhesive for bonding thermal insulation to the substrate formed by oriented strand boards. The substrate is provided with several types of penetration coatings or bonding primers and subsequently their influence on the adhesion of the cement adhesive is monitored. The best values were achieved when treating the surface treatment with a modified dispersion with quartz sand. On the other hand, the penetration coating of a mixture of water, nanodispersion of styrene-acrylate copolymer and additives is inappropriate treatment.
1 comment, 23.06.2020 08:28
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.
Building Regeneration

Decrease in the Bearing Capacity of Building Materials and Building Structures Due to the Effects of Rainwater on Examples of Faults of Churches of the Broumov Group

28.12.2020 | prof. Ing. Pavel Kuklík, CSc., ČVUT v Praze, Fakulta stavební, katedra mechaniky
This contribution deals with damage to buildings and building materials due to bad manage of rainwater regime. Effects are divided according to location of damage. First, the damage of roofs and roof trusses is presented, which are followed by examples of damage to the enclosure walls. The most attention, including numerical 3D modeling, is devoted to damage to foundation structures and foundations.
Building Regeneration

Stabilization and Strengthening of Vaulted Structures of Historic Buildings

21.12.2020 | prof. Ing. Jiří Witzany, DrSc., Ing. Radek Zigler, Ph.D., ČVUT v Praze, Fakulta stavební, katedra konstrukcí pozemních staveb, doc. Ing. Klára Kroftová, Ph.D., ČVUT v Praze, Fakulta stavební, katedra architektury
Many historic buildings are located in areas where there is a specific type of earthquake activity, the so-called earthquake swarms, during which a series of thousands of weaker tremors take place for several days or months. Sometimes these shocks are strong enough to be felt by people, and in some cases they can even cause material damage to buildings. Knowledge of the response, especially of vaulted structures of historic buildings to dynamic loads, is the basis of remediation interventions on monumental buildings exposed to these effects. Due to the increasing intensity of wheel and rail traffic, there is also an increase in the effects of the so-called technical seismicity on structures located near roads and tracks. The proposed system of additional stiffening of barrel, cross or of spherical vaults by means of prestressed flexurally rigid segmental ribs contributes to the increase of their resistance to the natural and anthropogenic dynamic effects.
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

Rekonstrukce historického mostu v lokalitě Portz Insel

19.7.2020 | doc. Ing. Eva Burgetová, CSc., Ing. Denisa Boháčová, ČVUT Praha, Fakulta stavební, katedra pozemních staveb

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Problémy spojené s určením typu výrobků podle EN 14388:2005

24.5.2021 | Ing. Pavel Rubáš, Ph.D., Technický a zkušební ústav stavební Praha s.p.
Building Physics

Simplified determination of point thermal transmittance of fixing elements with thermal brake

4.5.2021 | Ing. Martin Let
This article focuses on theory of thermal bridges of ventilated facades and deriving approximate formula to include effect of ventillated facades with fixing elements MFT-FOX (type HT and VT) on heat transmittance of construction by means of modeling 3D calculations of 3D constructions and analysing data of point and linear thermal transmittance.
Building Physics

Numerical Solution for the Impact of Soil on the Course of Temperatures in a Flat Green Roof

29.3.2021 | Ing. David Průša, prof. RNDr. Ing. Stanislav Šťastník, CSc., Ph.D., FAST VUT v Brně, doc. Ing. Karel Šuhajda, Ph.D., VUT FAST Brno, Ing. Tomáš Žajdlík, VUT FAST v Brně
The presented paper strives to assess the influence of the type and material composition of the roof on the course of temperatures in the roof structure by the so-called dynamic method.
1 comment, 29.03.2021 09:41
Building Physics

Sound Absorption Determination of Helmholtz Resonators Using the Transfer Matrix Method

26.3.2021 | Ing. Ondřej Nespěšný, Ing. David Jun, doc. Ing. Jan Pěnčík, Ph.D., Ing. Zuzana Fišarová, Ph.D., Vysoké učení technické v Brně, Fakulta stavební, Ústav pozemního stavitelství
The Helmholtz resonator is one of the most widely used low and medium frequency attenuation acoustic absorbers. While commercial products usually offer efficiency across almost the entire spectrum under consideration, in many cases only the specific natural resonance of the room needs to be suppressed. In such cases, it is necessary to proceed with your own design. This paper presents one of the possibilities of calculating a perforated resonator using the electro-acoustic analogy and the transfer matrix method. This method is not demanding on computing power, but nevertheless it is rarely used in current building-acoustic practice. This paper focuses on the comparison of the calculation of the sound absorption coefficient by this method with the data measured in the reverberation room.


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