Nejnavštěvovanější odborný portál pro stavebnictví a technická zařízení budov

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OC Fenix – overview of the energy consumption of the first year of the building operation for 07-2016 / 06-2017

15.10.2018 | Ing. Miroslav Urban, Ph.D., Ing. Michal Bejček, Ing. Marek Maška, Ing. Petr Wolf, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The article contains a summary of energy consumption, a comparison with the calculation assumptions in a particular administrative building. The object is designed with minimal energy consumption and the goal is to achieve the highest degree of energy independence using photovoltaics and battery storage. The actual course of measured energy consumption, the overall assessment for the past period, the monthly summaries for the building as a whole and the individual sub-measured energy consumption are given. The aim is to bring the issue to the professional public and to indicate the path to the solution.
2 comments, last 15.10.2018 21:57

R718 - water as refrigerant

15.10.2018 | Efficient Energy GmbH
Chiller operators are currently facing enormous challenges. In 2018, the next phase of the F-Gas Regulation is implemented across the EU. HFKW-type refrigerant prices have risen sharply and are a critical flaw, and safety requirements have been tightened on operators.

Polytropic steam dampening

9.10.2018 | doc. Ing. Aleš Rubina, Ph.D, Vysoké učení technické v Brně, Fakulta stavební, Ústav technických zařízení budov, Ing. Olga Rubinová, Ph.D., Vysoké učení technické v Brně. Fakulta stavební, Ústav technických zařízení budov
Steam dampening and air heaters are the most common air conditioning in the winter. Steam dampening has its hygienic advantages but also technical drawbacks.
1 comment, 09.10.2018 22:46

Near zero energy buildings realization in the Czech Republic

8.10.2018 | Ing. Jan Antonín, Ph.D., Ing. Zdena Dobrá, EnergySim s.r.o.
The notion of a nearly zero building, usually NZEB or nZEB, is no longer a novelty. This energy standard was introduced in 2016 and is gradually expanding into family houses. There are legislation, standards, but little has been gained. That's why the authors analyzed 130 already existing family houses with different heat sources. The result is an assessment of the influence of different heat sources on the energy intensity of homes and therefore an orientation aid for decision-makers of future builders.
Výsledky měření koncentrace CO<sub>2</sub> v&nbsp;ložnici při přirozeném větrání oknem

Results of carbon dioxide concentration measurement in the bedroom

10.9.2018 | Ing. Petr Bohuslávek, redakce
The measurement of carbon dioxide concentration was made in my bedroom in February 2018 within one week. CO2 concentration during the night is evaluated under different ventilation modes. The results show a significant effect of ventilation on air quality. They prove that only natural ventilation through tight windows in current developmental residential buildings is inadequate.
2 comments, last 17.09.2018 10:45

Satisfaction assessment of residents of passive housing for senior citizens

27.8.2018 | prof. Ing. Josef Chybík, CSc., VUT Brno, Fakulta architektury
In residential buildings, the quality of the indoor environment can be verified by the satisfaction rates of the people who live in them. One of the forms that can provide the necessary information is a subjective assessment. This form of survey was carried out with residents of the passive apartment building for seniors in Modřice. There were 25 women and 12 men of an average age of 77 years participating in the survey. The survey proved that seniors were able and willing to accept the terms of passive houses.
1 comment, 27.08.2018 14:07

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

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

Analysis of Solar Air Collector Solutions for Heating of Single Family House

16.7.2018 | Ing. Viacheslav Shemelin, Energetické systémy budov, UCEEB, ČVUT, Buštěhrad, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Solar air collectors can provide partial coverage of the heat demand for building heating. On the energy model of a family house, an annual heat supply for heating for different uses of air collector systems was examined. The analysis shows that, as opposed to the use of a ventilating unit with recuperation, the air solar collectors do not provide savings due to low solar gains and short operating hours in the winter. The combination of the air collectors with the regenerative unit does not bring a significant decrease in the energy requirement compared with the regenerative unit itself, as the combined efficiency of both devices is reduced.

ISH Shanghai & CIHE returns with an elevated sourcing experience for the East and Central China market

14.7.2018 | Messe Frankfurt (HK) Limited
ISH Shanghai & CIHE, the sister show of ISH China & CIHE in Beijing, will return to Shanghai New International Expo Centre from 3 – 5 September 2018 as the show cements its position as the most influential HVAC and home comfort exhibition in East and Central China.

Retrofit in terms of measurement and regulation

26.3.2018 | Ing. Jan Vidim
Measuring and control devices as well as other HVAC systems, run through their lifecycle, at the end of which the system needs to be reconstructed. A key condition for a successful retrofit is to determine the required life of the refurbished equipment.
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Economic assessment of energy saving measures in apartment buildings - HVAC systems

5.2.2018 | Ing. Karel Mrázek
The article deals with the economic assessment of energy saving measures as a further continuation of the topic of reconstruction of HVAC systems in apartment buildings. Selection of economical lifespan for selected elements and functional parts with preventive maintenance costs is provided. Finally, an example of the apartment building evaluation is given.
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Documents for the reconstruction of HVAC system in a residential building

22.1.2018 | Ing. Alena Horáková
The first article of the series on energetic reconstruction HVAC systems in residential buildings is focused on the preparation of project with minimum necessary information that should be prior to any commencement reconstruction. In current practice this part is significantly neglected.

The First Experiences with the Implementation of the New Atomic Law for Building Protection Against Radon

22.1.2018 | prof. Ing. Martin Jiránek, CSc., ČVUT v Praze, Fakulta stavební
The article analyses the impact of the new atomic law and its implementing decree on the design of radon preventive and remedial measures in residential buildings. The relationship between the newly introduced reference level and optimisation of the design, that gains importance, is explained. The article also discusses reasons that speak against the provision of the new law that radon index of the building site need not be determined, when a preventive measure based on soil ventilation is being designed.

Personalized ventilation in openspace offices

18.12.2017 | Ing. Vojtěch Mazanec, ČVUT v Praze, Katedra technických zařízení budov, prof. Ing. Karel Kabele, CSc., ČVUT v Praze, Fakulta stavební, katedra TZB
The article looks at the current building ventilation paradigm and offers one of the perspectives on possible future solutions. It discusses the benefits and limitations of current systems to replace the entire volume of air in the room, and offers a possible solution to overcome these limits. It further develops the theme of the future in advanced air distribution – a local and personalized solution for the supply and removal of ventilation air. It points to the possible benefits, savings and limits of today's highly discussed solutions that are being offered as an add-on or alternative to current systems.

Ventilation pipes air leakage rate and heat demand

4.12.2017 | Ing. Vladimíra Linhartová, České vysoké učení technické v Praze, Fakulta stavební, Katedra technických zařízení budov
By introducing the Eurovent regulation for air handling units, the higher requirements for ventilation designers were brought. However the effect of the high efficient AHU can be easily set back by ineligible air leakage through pipes before distribution into living areas. Pipe air leakage rate together with all components should answer to requirements on AHU established by valid standards.

Experimental measurement of toxic substances in indoor air before and after renovation of residential building and its heating

9.10.2017 | Ing. Imrich Sánka, Stavebná fakulta STU Bratislava, Katedra Technických zariadení budov
This study investigates the impact of energy renovation on the indoor air quality of apartment building during heating season. The study was performed in one residential building before and after its renovation. Energy audit was performed and energy certificate was calculated for the renovated and the non renovated condition of the dwelling. Objective measurements of CO2 concentration have been used for the evaluation. The average concentrations was much higher after the refurbishment. The air exchange rate was calculated, which was higher in the unrenovated apartments. This study shows that energy renovation of the residential buildings in Slovakia may reduce the quality of the indoor environment in the apartments especially in winter season.
Maintaining a healthy indoor environment requires much more intense air exchange after the reconstruction of the house as it is achieved. Although this is related to energy consumption, it is otherwise endangered by the health of the user. Reducing the thermal energy consumption of the house to the detriment of the quality of the indoor environment and the health of the users of the dwellings can not therefore be considered as a saving and can not be calculated when assessing the energy savings of the building's heating system after reconstruction.

New publication Ventilation of schools in context

11.9.2017 | doc. Ing. Vladimír Zmrhal, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí
At the beginning of the new school year, we would like to draw attention to the book Ventilation Schools in Contexts. All parents want their children to be successful at school. It also depends on class ventilation. We bring a selection from the chapters of the new publication.
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Comparison of Methods to Determine Smoke Flow Rate Applicable in Design of Equipment for Smoke and Heat Removal

4.9.2017 | doc. Ing. Jiří Pokorný, Ph.D., MPA, VŠB – TU Ostrava, Katedra ochrany obyvatelstva, doc. Ing. Marianna Tomášková, Ph.D., ) Technická univerzita v Košiciach, Strojnícka fakulta, Katedra bezpečnosti a kvality produkcie, prof. Ing. Horst Gondek, DrSc., VŠB-TU Ostrava, Fakulta strojní, Katedra výrobních strojů a konstruování, Časopis Vytápění, větrání, instalace
Smoke mass flow rate is one of the most important input variables used for design of buildings’ fire safety and fire safety equipment. Considerable number of methods is currently available to determine the smoke mass flow rate. They have been created by different authors often under very different conditions. The article describes some of the currently used methods and compares their results using selected statistical methods, which assess their mutual deviations. The comparison was performed separately for the flame zone and smoke zone of the vertical smoke column formed above centre of the fire.

Winter Operation of Air Conditioning Systems in New Office Buildings

19.6.2017 | Časopis Vytápění, větrání, instalace, Ing. Miloš Lain, Ph.D.
The article deals with thermal balance of the administrative building during winter operation. It refers to the fact that for the existing administrative buildings the internal heat gains are often higher than the overall losses by heat transfer. The balance includes the influence of ventilation and heat recovery. The study is supplemented with detailed hourly analysis. The article discusses the conceptual solution for heating, ventilation and cooling of such buildings in winter. The article is also accompanied by actual experience with winter operation of selected buildings.

Modern rotary heat exchangers

22.5.2017 | Ing. Martin Postupa, KASTT, spol. s r.o.,
EU legislation to reduce the energy performance of buildings has caused major changes in heat recovery systems. E.g. The popular popular plate cross exchanger is now virtually unused due to its low efficiency.
1 comment, 22.05.2017 12:44
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14.11.2018 konference TZB-info o bytových domech

Připravujete rekonstrukci bytového domu, děláte PENB nebo audit? Jak na úspory za energie a zhodnocení domu? Unikátní publikace pro účastníky. Těšíme se na vás v Praze.

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