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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

Burning Natural Gas/Hydrogen Mixtures in Household Appliances – Part 2

15.3.2021 | Ing. Josef Fík, Dr. Ing. Libor Čapla, RWE Gas Storage CZ, s. r. o., Ing. Jiří Žahourek, CSc., LABGAS | časopis Plyn
The authors analyze the possibility of burning natural gas with an admixture of hydrogen in gas appliances. The positive and negative aspects of the hydrogen content in natural gas and recommendations for its mixing into the natural gas distribution system are presented.

The contribution describes the effect of hydrogen content ranging from 0 to 25 mol% in a mixture with natural gas on burning in household appliances. Gaseous fuels with similar combustion characteristics, in particular Wobbe index and burning velocity, can only be used in a particular household appliance as a substitute. The various chapters describe the effect of hydrogen content in natural gas on the following: Wobbe index, composition of exhaust gases; emissions of CO2, CO and NOx; burning velocity; output of burners/energy demand of appliances, efficiency of appliances; flame stability; and temperature of combustion. Recommendations on hydrogen content in natural gas for household appliances, accepted from reference literature, are set out there. In conclusion, the authors discuss the pluses and minuses of hydrogen content in natural gas and offer recommendations for hydrogen injection into natural gas distribution systems from the perspective of burning these mixtures in household appliances.
1 comment, 18.03.2021 15:46

Heating

Burning Natural Gas/Hydrogen Mixtures in Household Appliances – Part 1

8.3.2021 | Ing. Josef Fík, Dr. Ing. Libor Čapla, RWE Gas Storage CZ, s. r. o., Ing. Jiří Žahourek, CSc., LABGAS | časopis Plyn
The authors analyze the possibility of burning natural gas with an admixture of hydrogen in gas appliances. The positive and negative aspects of the hydrogen content in natural gas and recommendations for its mixing into the natural gas distribution system are presented.
Heating

Use of an electrostatic precipitator to reduce dust emissions from a low power boiler

16.2.2021 | Ing. Oleksandr Molchanov, Miroslav Jaroch, Ing. Kamil Krpec, Ph.D., Ing. Jiří Horák, Ph.D., Ing. František Hopan, Ph.D., Ing. Lenka Kuboňová, Ph.D., Ing. Jiří Ryšavý, VŠB-TU Ostrava, Výzkumné energetické centrum, Ing. Leopold Benda, Ing. Roman Swaczyna, BENEKOVterm s.r.o.
By using an electrostatic precipitator, dust emissions (TZL - solid pollutants) from the solid fuel boiler were reduced well below the level of requirements according to ČSN EN 303-5 - class 5 and the Ecodesign Directive. This work describes the design of the separator and also presents the achieved emission parameters of the boiler with an output of 250 kW.
Heating

From the expert's point of view: Why does the law prohibit the burning of chipboard pellets in domestic boiler rooms?

8.2.2021 | Ing. Zdeněk Lyčka
The burning of wood and wood sawdust, which are contaminated with adhesives and various means of surface protection, in domestic boiler rooms is harmful to the environment and also endangers the health of the heat source operator.
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
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.
Water and Drainage

Rehabilitation of Chemically Attacked Sewers

22.2.2021 | Ing. Aleš Jakubík, Redrock Construction s.r.o., Ing. Radek Hermann, VUT v Brně, Fakulta stavební
Example of rehabilitation of sewerage facilities, shafts and chambers in an environment of the historic city center with increased loads of chemical-biogenic corrosion. Possible causes and consequences for both, original and newly constructed, building structures. Modification of the proposed solution, including the design of an appropriate construction structure and installation technology solution.
Water and Drainage

Ventilation of internal sewers

25.1.2021 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Internal sewers can be a source of odors in a building. The penetration of odorous gases into the interior is prevented by suitably designed ventilation of sewers and installation of odor traps (slang called siphons). The article summarizes the causes of odor penetration and the principles of sewer ventilation design.
2 comments, last 25.01.2021 17:36
Water and Drainage

Denitrifikační bioreaktory s náplní na bázi dřeva a možnosti zmírnění negativního efektu

30.11.2020 | Ing. Mgr. Kateřina Schrimpelová, Ph.D., Ing. Zuzana Bílková, Ph.D., Vysoké učení technické v Brně, Fakulta stavební, Ústav chemie
Contamination of aquatic ecosystems with nitrates is a worldwide problem that is leading to & nbsp; eutrophication of surface waters and increasing the cost of treating water for drinking water. One possible solution to this problem is the innovative wood-based denitrification bioreactor technology, which is capable of removing directly at the & nbsp; outlet point of agricultural land. This technology is not yet used in the Czech Republic, but has been in operation abroad for many years (especially in Canada, the United States and New Zealand). Denitrification bioreactors with & nbsp; wood filling have a number of advantages (low acquisition and operating costs, minimal maintenance and long life), but also several still unresolved problems, including leaching high concentrations of organic matter from the & nbsp; biodegradable charge of the bioreactor during its start-up phase, which can lead to oxygen deficiency in the recipient and toxic effects on aquatic organisms. The aim of our research is to study this technology for its implementation in practice in the Czech Republic. The paper presents a search of knowledge about & nbsp; denitrification bioreactors with & nbsp; wood-based filling and discusses the possibilities of mitigating the negative consequences resulting from & nbsp; their operation.
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
Renewable Energy

Vliv nízké teploty na kapacitu vybraných Li-ion akumulátorů

4.1.2021 | doc. Ing. Tomáš Kazda, Ph.D., Fakulta elektrotechniky a komunikačních technologií VUT v Brně, Ústav elektrotechnologie

2 comments, last 28.03.2021 21:51
Renewable Energy

Analysis of hot water preparation by solar system for apartment house

28.12.2020 | Ing. Viacheslav Shemelin, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze, Časopis Vytápění, větrání, instalace | Vytápění větrání instalace, 2019-3
The design of a solar system for the preparation of hot water in an apartment building is analyzed by computer simulation. The analysis shows the effects of the design of the area of solar collectors, climatic conditions, the connection of the circulation circuit and the design of the volume of the solar storage tank on the solar coverage and specific heat gains.
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
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

© fotolia.comFacility management

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

8.4.2021 | Ing. Miroslav Mareš, ASOCIACE ENERGETICKÝCH AUDITORŮ - ENERGETICKÝCH SPECIALISTŮ
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.
Facility management

The structure of legal regulations, including standards and their characteristics for the calculation of energy performance of buildings

9.2.2021 | doc. Ing. Petr Horák, Ph.D., VUT v Brně, Fakulta stavební, Ústav technických zařízení budov
The assessment of the energy performance of buildings depends on a large number of calculations, which must comply with the applicable legislation. The article presents the related structure of legal regulations, including standards and their brief characteristics.
© AdobeStockFacility management

Measurement of Project Information Quality in BIM

29.11.2020 | Ing.arch. Zdeněk Rudovský, Ph.D., Rektorát ČVUT v Praze, odbor výstavby a investiční činnosti
The benefits of BIM are discussed at almost all the conferences concerning the construction industry. Better quality project documentation is one of the most often referred assets of projects modelled in BIM. Unfortunately, it is not clear whether this benefit was realised in the projects or not. So, there raise following questions:

  • How exactly was the declared better quality measured?
  • What exactly is meant by the better quality documentation in practise?
  • How can a contracting authority assess the quality of the project data processed by BIM models?

This article will try to answer all these questions and introduce the reader into the elementary principles of the quality measurability of the project information.

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

© Fotolia.comShell Construction

Diagnose of Reinforced Concrete Structures Damaged by Fire

29.3.2021 | Ing. Peter Kyselica, Ing. Patrik Ševčík, Technický a skúšobný ústav stavebný, n.o., Bratislava
The aim of the paper is to summarize and evaluate individual diagnostic procedures that diagnose reinforced concrete structures damaged by fire. Based on our experience, we tried to design a methodology for the selection and use of individual diagnostic methods and procedures. Knowledge of the objective state construction after a fire is the basis for determining the procedure of its subsequent remediation.
Shell Construction

Repair Reinforced Concrete Ceiling Construction of Pasohlávky Water Tank

15.3.2021 | Ing. Stanislav Bíza, SASTA CZ, a.s.
The subject of the complex repair of the ceiling structure of the water reservoir Pasohlávky was the remediation and static provision of the unsatisfactory reinforced concrete structure. The original condition was inadequate, parts of the concrete structure were dropped due to steel due to steel corrosion and small cover layers of concrete.
Shell Construction

Stability of Steel Circular Arches

8.3.2021 | prof. Ing. Josef Macháček, DrSc., ČVUT v Praze, Fakulta stavební
The article presents a stability analysis of circular arches under various uniform loadings (vertical to the arch plan, vertical to the arch length or radial to the arch axis). Linear bifurcation analysis resulted into critical loadings used for determination of the arches buckling length factors. With the exception of the radial loading the variable axial arch forces need to be taken into account also for the relative Euler basic strut. The analysis covers various boundary conditions of the arches in supports. The study embodies arches with both closed and open cross sections and proved the significant impact of the cross-sectional shape on out-of-plane buckling values. The article outcomes are tables with correct buckling length factors of arches.
Shell Construction

Punching of Ceiling Slabs According to prEC2 Second Edition

1.3.2021 | Ing. Jiří Šmejkal, CSc., ŠPS - statická kancelář, Plzeň
This paper deals with new methodology of design and verification of the limit state of punching of ceiling slabs in the prepared prEN 1992-1-1 [2]. The current methodology does not described with sufficient accurancy and with sufficient reliability the behavieur of the slabs structures in the area of supporting on columns and on ends and corners of walls.
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.
Insulation, Roofs, Facades

Specific Problems of Wooden Houses with Crawl Space

2.11.2020 | doc. Ing. Miloš Lavický, Ph.D., Ing. Zuzana Mastná, Ph.D., VUT FAST Brno
The paper is presenting problems that are to be solved within expert opinions focused on wooden houses which foundation is designed as a crawl space.
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 technologie stavebních hmot a dílců, doc. Ing. Milan Ostrý, Ph.D., VUT FAST Brno
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)

Windows, Doors

Údržba zasklení

22.3.2020 | Ing. Roman Šnajdr, SIPRAL a.s., člen TK ČKLOP | Česká komora lehkých obvodových plášťů (ČKLOP)
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.
© sever180 - Fotolia.comFloors, Partition Walls, Surfaces

Komentáře a diskuse k obsahu normy ČSN 74 4505 Podlahy (3. část)

18.11.2020 | doc. Ing. Jiří Dohnálek, CSc., autorizovaný inženýr a soudní znalec, Ing. Petr Tůma, Ph.D., Betonconsult s.r.o.

1 comment, 09.02.2021 14:33
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
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.
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.
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.
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

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.
ilustrační snímek © Fotolia.comBuilding Physics

Rating Insolation of Buildings According to EN 17037

15.3.2021 | doc. Ing. Jan Kaňka, Ph.D., člen TNK 76 Osvětlení, ČKAIT Praha
The European standard ČSN EN 17037 Daylighting of buildings has been valid in the Czech Republic since August 2019. A year and a half is enough time for the first evaluation of its functioning in project practice. The author of the article deals intensively with this practice and in this paper he would like to share some of his findings concerning the assessment of solar exposure of buildings according to this new European standard. On the edge of this problem, the relationship between accuracy and uniformity in normative requirements is also discussed.
8 comments, last 24.03.2021 09:14
© Brian Jackson - Fotolia.comBuilding Physics

Revision of the Czech Technical Standard ČSN 73 0532:2020 Commentary

1.3.2021 | Ing. Pavel Rubáš, Ph.D., Technický a zkušební ústav stavební Praha s.p.
The paper describes the changes that has been introduced in the new version of the ČSN 73 0532:2020, all the changes are described in details.

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