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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

Indoor environment monitoring platform

15.5.2017 | Ing. Jan Včelák, Ph.D., Ing. Daniel Adamovský, Ph.D., Bc. Jan Mrňa, Ing. Aleš Vodička, Ing. Marek Maška, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Indoor environment quality is being more and more discussed topic. Technologies for indoor monitoring are becoming affordable and thus can be installed as autonomous monitoring and indicative systems. It can be used also in connection with ventilation system. In this article there are summarized the most important quantities related to the indoor air quality with its limit values. Particular technologies of sensors are mentioned and new sensor platform for complex monitoring of indoor environment with possible usage for controlling systems affecting indoor environment is introduced.

Study of the properties of heating radiators and convectors

10.4.2017 | Ing. Jindřich Boháč, Ing. Roman Vavřička, Ph.D., Ústav techniky prostředí, Fakulta strojní, ČVUT v Praze, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper focuses on the analysis and experimental comparison of operating characteristics of various types of radiators. The first part contains a brief search of radiators available on the Czech market. The following is the theoretical analysis of the thermal inertia of the selected objects, both in the phase of start-up and cooling-down. This analysis serves as a basis for evaluating operating performance. Additional consideration by the parameters of the radiator in this study are the geometrical characteristics (the criterion of the space occupied by the dimensions of the body and the size of the transfer surface on the air side), the weight criterion (radiators without heating fluid) volume criterion (heat-carrying substance in the body). Each of the above criteria is related to nominal thermal output.
12 comments, last 25.04.2017 10:29

The invention, patent or utility model - who should sort?

8.3.2017 | Ing. Zdeněk Lyčka
The article explains the differences between the invention patents and utility model from the perspective of Czech legislation. Also highlights the confusion individual categories and purposeful fraud by producers and sellers of equipment.
1 comment, 08.03.2017 07:44

Reducing of Noise from Sources of Heat and Propagation of Sound

9.1.2017 | Ing. Miroslav Kučera, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Vytápění, větrání, instalace
The paper presents an example of solving the propagation of noise from an air/water heat pump installed in the basement of an apartment building. Air intake and exhaust are brought out on the façade of the building, where it is calculated the noise situation in the protected exterior of the building. In the interior it is solved the propagation of sound from the plant room to the protected interior space. In conclusion, the results are compared with the data from the report on measurement at the realized work.

Access to Buildings with Nearly Zero Energy Consumption

2.1.2017 | prof. Ing. Karel Kabele, CSc., Ing. Miroslav Urban, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The article describes the impact of the contemporary and future legislative requirements for new buildings in terms of their conception and utilization of renewable resources. Soon, the requirement of quality standard is going to be effective in the Czech Republic that is called building with nearly zero energy consumption. That quality standard is defined at national level by legal regulations based on the requirement of European standard. On examples of family house, residential house and administration building, the impact of the to-be-established requirements for building conception is being demonstrated from the construction as well as the technical systems' point of view. With the existing development trend maintained it can be expected that a building with nearly zero energy consumption will have, comparing to an existing building, a better quality building shell, technical systems working with high efficiency and potentially may but needn't be, partially supplied by renewable energy resources.
1 comment, 17.09.2017 11:11

Heating and Exhaust Ventilation System – CFD Simulation

12.12.2016 | Ing. Martin Kny, Ph.D., České vysoké učení technické v Praze, UCEEB
Paper evaluates the distribution of air temperature in residential room using a central system of ventilation. Depending on the position of the feeder element for fresh air is evaluated by several variations of the system. The presented results are output from the CFD simulation from ANSYS Fluent.
1 comment, 14.12.2016 15:14

PM₁ and new focus on human health protection

5.12.2016 | Ing. František Bálint, Camfil s.r.o., Levice, Slovensko
Although the WHO and the EU monitor PM2.5 a PM10 particles, PM1 particles have the smallest and most harmful fraction.
1 comment, 05.12.2016 13:50

History, present and future of requirements for school ventilation

21.11.2016 | doc. Ing. Vladimír Zmrhal, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí
The paper briefly surveys the history of ventilation requirements of schools, reflects on the current wording of the legislation that have a direct relationship to the the issue and carefully looks out for future legislation.
1 comment, 21.11.2016 10:17

Noxious substances in the indoor – radon in the air of homes and flats

7.11.2016 | MUDr. Ariana Lajčíková, CSc.
People spend the majority of their life indoors – in houses and flats. While outdoors the pollutants are diluted by mass of the air, indoors after installation of new tight windows and thermal insulation of facade this danger increases. Very important pollutant – dangerous to life – is radon in the air. This gas, penetrating into houses mainly from the subsoil, is un important cause of lung cancer. The Czech Republic is the country with the highest average concentration of radon in flats in Europe. The average level in our country is 120 Bq/m3, while in 30 % of population were found higher levels, sometimes even several thousands of Bq. Each year, 5,600 peoples hear a diagnosis of lung cancer. 16% of diseases is from radon and decay products and ionizing radiation
At present, after the Resolution of the Czech Government the third period of the Radon program is in progress. In this program I am the deputy of the Czech Ministry of Health. In my information I would like to point your attention to this important risk and to the health protection necessity. Sufficient ventilation of buildings is the essential.

Cooling demand for preservation of food in retail food stores and the potential of energy savings - part II.

8.8.2016 | Ing. Tomáš Adamec, Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Fakulta stavební, Katedra technických zařízení budov
The paper is focused on the energy needs for preservation of food in retail food stores, which means cooling and freezing of food. The first part of the article is devoted to the issue of cold appliances in supermarkets, which include refrigeration and freezer boxes and furniture for distribution and sales. The second part of the article is based on the calculation of a refrigeration load and cooling demand for case study of a reference retail food store. The article aims to highlight the issue of energy need for preservation of food and defining of approach for design of general food refrigeration equipment of reference retail food store and to create conditions to establish energy-saving measures.
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