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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


Effect of Nocturnal Attenuation of Heating on the Annual Heat Demand in an Apartment Building

23.1.2023 | doc. Ing. Ondřej Šikula, Ph.D., VUT v Brně, Fakulta stavební, Ústav technických zařízení budov, Ing. Josef Plášek, VUT v Brně, Fakulta stavební

Jak postupovat při poškození plynových zařízení při zemních pracích

10.1.2023 | Ing. Jiří Buchta, CSc., předseda sekce plyn ČSTZ soudní znalec - technické obory různé se specializací plynové zařízení (topné a technické plyny), CTI ČR
Model tepelného čerpadla v Malmo (Zdroj: GEA)Heating

Industrial High-temperature Heat Pumps for District Heating Systems in Europe. Part 2 of 2

3.1.2023 | Ing. Erika Langerová, Ing. Nikola Pokorný, Ph.D., doc. Ing. Tomáš Matuška, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budov
High-temperature water-to-water compressor heat pumps with different refrigerants and configurations can be used in district heating systems operating at temperatures between 60 and 120 °C. Part 1 describes the development of installations in Europe and the current state of development, including an overview of the market offer.
Zdroj: FriothermHeating

Industrial High-temperature Heat Pumps for District Heating Systems in Europe. Part 1 of 2.

27.12.2022 | Ing. Erika Langerová, Ing. Nikola Pokorný, Ph.D., doc. Ing. Tomáš Matuška, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budov
High-temperature water-to-water compressor heat pumps with different refrigerants and configurations can be used in district heating systems operating at temperatures between 60 and 120 °C. Part 1 describes the development of installations in Europe and the current state of development, including an overview of the market offer.
Ventilating and Air-Conditioning

Evaluation of the Impact of Heat Loss by Natural Ventilation from the Point of View of Energy Efficiency

31.1.2022 | doc. Ing. Zuzana Straková, PhD., STU v Bratislave, Stavebná fakulta, Katedra TZB
Ventilation infiltration in the form of leaking windows, doors is associated with unwanted heat leakage in cold periods. The size of the leakage depends on both the intensity of ventilation and the amount of energy contained in the air. The calculation should include not only the specific heat capacity of the dry air, but also the energy contained in the water vapor in the air.
Ventilating and Air-Conditioning

Indoor Environmental Quality of Apartments Units in Different Stages of Interior Construction

24.1.2022 | Ing. Katarína Harčárová, Ústav environmentálneho inžinierstva, Stavebná fakulta, Technická univerzita v Košiciach
The presented paper deals with the evaluation of the indoor environmental quality (IEQ) in two apartment units in different stages of interior construction - in the initial state and in the final state of a completely furnished apartment. The results of IEQ monitoring confirmed the minimal differences between an unfurnished apartment and a fully furnished apartment in terms of thermal-humidity microclimate. The average particulate matter concentrations of the two representative fractions (PM2.5 and PM10) were higher for apartment in the initial state. On the contrary, higher concentrations of total volatile organic compounds (TVOC) were recorded in the case of a furnished apartment. The legislative limit for PM10 (50 µg/m3) and the maximum recommended Mølhave value (200 µg/m3) for TVOC were exceeded several times in both apartments. In the case of unfurnished apartment, workers are exposed not only to increased concentrations of TVOC, but also to increased concentrations of PM, and should therefore pay attention to the protection and safety of health at work. More detailed monitoring aimed at identifying and determining the target VOCs showed the presence of xylenes and ethylbenzene in the indoor air of an unfurnished apartment. In addition to xylenes and ethylbenzene, toluene was present in the furnished apartment. Concentrations of these compounds were below legislative limits, except for ethylbenzene, for which no legislative limits are set. It follows from the above that further surface treatment and furnishing of the apartment contributes to increasing the level of VOCs in the indoor environment.
Water and Drainage

Comparison of central and decentralized solar hot water systems

16.1.2023 | Ing. Viacheslav Shemelin, Ph.D., doc. Ing. Tomáš Matuška, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budov | VVI 2022-3
An analysis of a central and decentralized solar domestic hot water system for an apartment building shows that the usable solar gain and year-round efficiency are similar, but the solar coverage and the need for backup heat source energy are fundamentally different.
Water and Drainage

Logging to Determine the Causes of Affecting the Water Levels

22.12.2022 | RNDr. Martin Procházka, geologické dozory staveb, SG Geotechnika Praha
Recently, there have been more and more cases of suspected influence on water levels. There are more and more related disputes with this trend. However, the employees of water authorities have no choice but to rely on the experience of the geologist who prepared the project. In terms of form, the project can be processed well. But fatal problems can arise in terms of well operation. A special chapter is the wells for heat pumps with all their shortcomings and huge technical problems with grouting cement mixtures resulting from small diameters of wells. The aim of this paper is to inform about the wide possibilities of well logging to find out the real cause of the problems related to the level drops and to suggest the optimal way of remediation.
Water and Drainage

Searching for New Municipal Drinking Water Sources

15.12.2022 | Mgr. Jan Beneda, Mgr. Michaela Janči, Mgr. Eva Pařízková, CHEMCOMEX, a.s., Divize geologie a sanace, Praha Zbraslav
Lithiové články, foto © TZB-infoRenewable Energy

Materiály pro Li-ion akumulátory – porovnání

3.11.2022 | Tomáš Kazda, Ústav elektrotechnologie VUT v Brně
Renewable Energy

Nové způsoby hašení lithiových baterií a jejich zkoušení

19.5.2022 | plk. Ing. Jan Karl, vedoucí oddělení výzkumu a vývoje a zkušební laboratoře TÚPO
Renewable Energy

Assessment of Building in Terms of Carbon Footprint and Circular Economy

17.2.2022 | Ing. Jana Budajová, Ing. Silvia Vilčekvá, PhD., doc. Ing. Peter Mésároš, PhD., Technická univerzita v Košiciach, Stavebná fakulta, Ústav pozemného stavitelstva
The construction industry is the primary source of environmental impacts, especially the carbon footprint. Life cycle assessment (LCA) as an analytical method is used for quantifying the environmental impact of the investigated residential building. Life cycle costs (LCC) from the point of view of the circular economy create an economic model prioritizing reuse and recycling. The aim of this paper is to assess the residential building in terms of carbon footprint, using LCA analysis and circular economy, using LCC analysis. The residential building emits 1 756 tons of CO2e , which represents 41.35 kg CO2e/m2/year. The total estimated life cycle cost of the building in nominal terms is 1 694 699.61 €. This is the average total life cycle cost of 1 995.21 €/m2.
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.

Is it possible to fully replace a nuclear power plant with photovoltaics?

23.6.2022 | Ing. Zdeněk Reinberk, Ph.D., redakce
A nuclear power plant is a powerful and stable source of electricity. Full replacement of such source with photovoltaics is not easy. We calculated how much PV panels and batteries would be needed for replacement and how much it would cost. The calculation in the article is interactive and the individual calculation parameters can be modified.
Facility management

Digitalizace vodohospodářských staveb, vývoj projektování metodou BIM

6.10.2022 | Ing. Viktor Sláma, Ing. Dominik Wallenfels, Ing. Stanislav Hanák, Sweco Hydroprojekt a.s., Ing. Jindřich Sláma, Ph.D., D-PLUS PROJEKTOVÁ A INŽENÝRSKÁ a.s.
The article describes, using the example of three projects designed in different time periods, the evolution of project preparation from a 3D coordination project model, through a BIM passport of the actual state of the water management object filled with data structure, to a development project that links the digital 3D project documentation with the budget, schedule, allows its display in GIS and publishing and commenting on the Common Data Environment (CDE). It also describes the specifics of BIM as a part of the contract, including the role of the client in the process. Finally, it evaluates the benefits of BIM from the designer's perspective and shows possible future trends.
foto © SiemensFacility management

Design of Technological Units in COMOS as Preparation for BIM

13.9.2022 | Ing. Petr Dolejš, Ph.D., Vysoká škola chemicko-technologická v Praze, Fakulta technologie ochrany prostředí, Ústav technologie vody a prostředí, Ing. Filip Hložanka, VDT Technology, a.s., Praha
Design engineering using standard objects brings new possibilities to water management design practice. Similar to CAD tools in the past, integrated engineering now represents the gateway to the world of digitization of water management units and can be understood as an effective pre-step before the introduction of BIM, enabling the creation of digital twins and operational optimization. These new procedures can open the gates of perception of the project and management of the whole in hitherto unknown levels. Due to emerging legislative and business trends in the Czech Republic, we can expect an increased demand for digitally processed projects in object architecture, enabling an interconnected approach to the creation and management of documentation in individual phases of the life cycle of a technological unit.


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

Vliv fluidního popílku na objemové změny betonu

30.1.2023 | Ing. Milan Meruňka, VUT FAST Brno, Ústav technologie stavebních hmot a dílců, prof. Ing. Rudolf Hela, CSc., Ing. Martin Ťažký, Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců
This article deals with a possible combination of high-temperature fly ash and fluidized fly ash. The aim of this work is to verify the influence of the combination of these two secondary energy products not only on the physical-mechanical parameters of concrete, but especially on its volume changes. The obtained results show that the addition of fly ash to the concrete mixture results in higher physical-mechanical parameters of the concrete mixture. And this despite the higher content of mixing water. The addition of fly ash to concrete resulted in a slight increase in volume changes of concrete. Even so, this finding can be considered a very valuable contribution to technical practice.
Foto ©Photographer2575 - Pixabay.comShell Construction

Suitability of Variant Permeability Tests for Estimation of Fibre Concrete Durability With and Without Concrete Recyclate

23.1.2023 | doc. Ing. Michal Stehlík, Ph.D., Mgr. Jana Stehlíková, VUT FAST Brno, Ústav stavebního zkušebnictví
The test results show that both TORRENT and ISAT methods can be used to assess the durability of both concrete and fibre concrete with dense aggregate. In the case of concrete containing concrete recyclate, however, the TORRENT method was not effective. Also the method of determining the permeability for CO2 was not suitable for the concrete with concrete recyclate.
Shell Construction

Zranitelná místa dřevěných krovů různých typů

17.1.2023 | Ing. Jiří Bláha, Ph.D., Ústav teoretické a aplikované mechaniky AV ČR, v. v. i.
The stock of historic roof trusses preserved in our territory goes back 700 years and represents a very wide and varied range of individual design solutions. The fundamentally different structural groups (rafter trusses, trusses with purlins, purlins, trusses with trusses, trusses with trusses, trusses with purlins, trusses with purlins) are divided into a number of typological subgroups, which are further divided into dozens of unique variants and their combinations. Some of them have proved more successful over time, others less so. It can be said that the constructions most commonly used in the past are also among the best tested. But even these roofs have their weak points, which are good to know about, especially if we are to repair or care for such a roof properly and thus ensure its longest possible durability in the future.
Foto ©imfotograf - Fotolia.comShell Construction

Dřevo a jeho schopnost propouštět kapaliny

9.1.2023 | Ing. Andrea Nasswettrová, Ph.D., MBA, ProDřevo ateliér, Společnost pro technologie ochrany památek STOP, z.s.
The paper deals with the question of the ability of wood to accept fluids in relation to the effectiveness of pressure grouting as one of the remediation methods for the elimination of insects in wooden elements of structures. The penetration of a chemical substance through the wood structure after its application by pressure grouting is investigated using acoustic, microscopic and X-ray equipment in the laboratory. Finally, the wood samples are subjected to destructive testing.
Insulation, Roofs, Facades

Realizácia a prvotné výsledky merania extenzívnych vegetačných striech na Žilinskej univerzite

27.4.2022 | Ing. Peter Juráš, PhD., Stavebná fakulta Žilinskej univerzity, Katedra pozemného stavite
Green roofs are considered one of the best ways to eliminate summer overheating, mitigate climate change, or reduce the urban heat island effect. The winter season and its impact on building energy consumption are often overlooked. This paper deals with experimental measurement of the different green roof samples. The impact on the membrane temperatures is analyzed for two green roof and compared with the regular single ply flat roof and with gravel covered one. Initial results are provided for short time period of each seasons. Also the impact of the rain and water retention is showed.
Degradovaná hydroizolace z mPVC na ploché střeše, foto: redakceInsulation, Roofs, Facades

UV degradácia povlakovej krytiny na materiálovej báze m PVC

5.4.2022 | Ing. Jozef Kováč, doc. Ing. et Ing. arch. Milan Palko, PhD., Ing. Angela Kleinová, Stavebná fakulta, STU v Bratislave; Ústav polymérov
The analysis of the UV requirements for coating materials for market placement is a good tool to evaluate their quality parameters. Testing of polymeric materials using fluorescent light sources is feasible according to STN ISO 4892-3. Testing of strength properties is optimally defined by STN EN 12311-2. Infrared spectroscopy belongs to the group of non-destructive analytical methods where the sample under examination is not damaged by the analysis and yet provides information on its composition.
Foto © Ciur a.s.Insulation, Roofs, Facades

Tepelné izolanty na prírodnej materiálovej báze v strechách

24.3.2022 | Ing. et Barbora Králová, Ing. arch., Slovenská technická univerzita v Bratislave, doc. Ing. et Palko Milan, Ing. arch. PhD., Slovenská technická univerzita Bratislava, Stavebná fakulta, Katedra konštrukcií pozemných stavieb
Insulation, Roofs, Facades

Vplyv vegetačnej strechy na priebeh povrchových teplôt hydroizolačnej vrstvy v zimnom období

14.3.2022 | doc. Ing. Marián Vertal’ PhD., Technická univerzita v Košiciach, Stavebná fakulta, Fakulta stavební, VUT Brno, prof. Ing. Zuzana Vranayová, PhD., Ing. Alena Vargová, Ing. Katarína Čakyová, PhD., MBA, Technická univerzita v Košiciach, Stavebná fakulta
The paper presents the implementation of the experiment of the greenIZOLA research activity, which is focused on the conversion of the IZOLA Košice construction company. The study focuses on the hitherto little researched topic of thermal stress of waterproofing layers of vegetated roofs in the winter season. The visualization of measured surface temperatures confirms a substantial reduction of temperature oscillations on the waterproofing layer due to the application of the vegetation roof.
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

Effect of Wood-cement Materials Composition on Stabilization of Spruce Chips Properties

26.4.2022 | Ing. Tomáš Melichar, Ph.D., doc. Ing. Jiří Bydžovský, CSc., Ing. Lenka Mészárosová, Ph.D., Ing. Amos Dufka, Ph.D., Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců
One of the very essential aspects to ensure adequate durability of composite materials that combine cementitious matrix and wood is the stabilization of the wood structure. Stabilization of the wood structure is particularly important in relation to the moisture effect on the wood-cement composite mechanical properties. Stabilization of the wood matrix is generally carried out by means of suitable types of additives. This paper deals with a detailed analysis of the influence of the wood-cement materials composition in relation to the effect of liquid water. Another essential area of the presented research is the analysing the ability of the modified matrix (by different types of industrial wastes) to fix sugars in the structure of the wood mass, with regard to the possible affecting the hydration process of the cement matrix.
Vyrovnávací podsyp suchých podlahFloors, Partition Walls, Surfaces

Leveling Material of Dry Floors Based on By-product from Cement-bonded Particleboard Formatting

11.4.2022 | Ing. Tomáš Melichar, Ph.D., doc. Ing. Jiří Bydžovský, CSc., Ing. Miroslav Vacula, Ing. Šárka Keprdová, Ph.D., Vysoké učení technické v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců
Floor leveling materials have an irreplaceable place in the construction or reconstruction of buildings, especially in the construction of floors where the aim is to reduce the wet process in relation to the speed of completing. Various types of raw materials (expanded clay, aerated concrete, mineralised wood chips, etc.) are used for floor leveling materials. This paper presents research and development of a new type dry leveling floor material based on treated cuttings from cement-bonded particleboard processing. This leveling material is intended for reconstruction and even construction of new floors in buildings. Research and development takes into account the environmental situation, because approximately 5,000 t of cuttings is produced during the formatting of cement-bonded particleboard annualy. The intention of the research and development was to assess the properties and behaviour of the leveling material based on suitably modified cuttings from the production of cement-bonded particleboards. The composition of the cuttings was adjusted in a jaw crusher and subsequently, different variants of the leveling material were analysed in terms of particle size distribution, compressibility, confined compressive strength, water absorption and thermal conductivity coefficient. The properties of the developed material were also compared with the parameters of commonly commercially available leveling materials.
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
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

Průzkum historického vodojemu v zauhlovací věži ve Vratislavicích

28.12.2022 | doc. Ing. Eva Burgetová, CSc., Ing. Zuzana Rácová, Ph.D., Ing. Martin Vonka, Ph.D., ČVUT Praha, Fakulta stavební, katedra pozemních staveb, Ing. Robert Kořínek, Ph.D., Výzkumný ústav vodohospodářský T. G. Masaryka, v.v.i
As a part of the Program for the Support of Applied Research and Development of National and Cultural Identity (NAKI II) of the Ministry of Culture of the Czech Republic, the research project “Water Towers – Identification, Documentation, Presentation, New Use” is under investigation by the Water Management Research Institute of TG Masaryk and co-researcher the Faculty of Civil Engineering of CTU in Prague. The mission of the project is to process the historical development of the water towers in our territory and to make this cultural heritage accessible to a wide range of interested parties. The project aims at preserving the cultural heritage for the next generation and preserving technical monuments.
Building Regeneration

Methodologies for Valuation of Buildes Damaged by the Natural Disaster – Tornado

3.5.2022 | Ing. Pavel Klika, Ph.D., Ing. David Brandejs, Ing. Vítězslava Hlavinková, Ph.D., Ing. Monika Doležalová, Ing. Martina Vařechová, VUT Brno, Ústav soudního inženýrství
In connection with the natural disaster that hit the Břeclav and Hodonín regions in June last year, more than a thousand houses, buildings, halls and other structures were damaged or completely destroyed. Real estate was owned by both natural and legal persons, as well as by cities, municipalities and state institutions. Several state and non-state, for-profit and non-profit organizations came with financial help. To determine the amount of support, subsidy or loan, it was required to document the estimated costs of compensation. The estimated costs were determined on the basis of several methods, taking into account the type and type of real estate, ownership, and the extent of damage. The methods used to determine the estimated costs of compensation are described below.
Císařský špitál na Pražském hraděBuilding Regeneration

Structural Survey of Imperial Hospital of St. Anthony and St. Elizabeth at Prague Castle

22.12.2021 | doc. Ing. Eva Burgetová, CSc., Ing. Denisa Boháčová, ČVUT Praha, Fakulta stavební, katedra pozemních staveb
The article presents a structural survey of the historic building of the Imperial Hospital at Prague Castle. The aim of the survey was to determine the functional capability and durability of the building, including an assessment of its usability and evaluation of the condition of historical materials. The research was focused mainly on the issue of inappropriate interventions performed in the past and the associated increased moisture of structures.
Building Physics

Measurement of Sound Absorption Coefficient in Impedance Tube

2.7.2022 | Ing. David Jun, Ing. Ondřej Nespěšný, VUT v Brně, Fakulta stavební
The sound absorption coefficient is one of the most common quantities describing the acoustic behaviour of materials and structures intended for use in room acoustics. This contribution first shows a brief overview of techniques for measuring sound absorption coefficient. Special attention is paid to the impedance tube (often called Kundt tube) group of methods. The following is an introduction to the measurement of the transfer-function method and to a developed impedance tube prototype, including both the hardware assembly and the software implementation of the measurement.
Stěna porostlá zeleníBuilding Physics

Influence of Climbing Plants on the Surface Moisture of Building Structures

19.12.2021 | Ing. Jana Bartlová, VUT FAST v Brně, Ústav stavitelství
Greening of the cities (Green Architecture) is one of the current trends in the development of urban architecture. Apart from the system elements of facades overgrown or planted with vegetation, which are a question of the current century, the Green Architecture also includes the traditional use of plants - direct planting near building structures, with their gradual connection using climbing and attachment mechanisms of plants. The effects of such a surface on traditional and modern building surfaces have not yet been precisely defined. The paper presents the results of moisture measurement of the outer surface of traditional building structures in order to evaluate the effect of vegetation surface on the structure.
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About Standards for Daylighting in Building Regulations

2.8.2021 | doc. Ing. Jan Kaňka, Ph.D., člen TNK 76 Osvětlení, ČKAIT Praha
To properly understand the meaning of standardization of daylight, it is necessary to think in general about the reason for the existence of standards and the means of their creation. Such a consideration may have its current significance at this time, when the European Commission for Standardization (CEN) unified standards for daylighting of buildings throughout Europe and when the Chamber of Deputies of the Parliament of the Czech Republic approved a new building law.
© apttone - Fotolia.comBuilding Physics

O minimální výšce slunce v nové evropské normě

22.6.2021 | doc. Ing. Jan Kaňka, Ph.D., člen TNK 76 Osvětlení, ČKAIT Praha
The article acquaints the reader with the way in which ČSN EN 17037 sets the minimum height of the sun when evaluating the solar exposure of buildings. Even in this parameter, the new European standard provides developers with more space to fulfill their intentions in comparison with previously valid Czech regulations.


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