Archiv článků od 21.3.2016 do 11.9.2017

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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., ČVUT v Praze, Fakulta stavební, katedra TZB
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.

Cooling demand for preservation of food in retail food stores and the potential of energy savings

1.8.2016 | Ing. Tomáš Adamec, ČVUT v Praze, Fakulta stavební, Katedra technických zařízení budov, Ing. Miroslav Urban, Ph.D., ČVUT Praha, Fakulta stavební, katedra TZB
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.

Filtration in HVAC units for forced ventilation of houses II.

20.6.2016 | Ing. Pavel Vybíral, Ph.D., Fakulta strojní ČVUT, Ústav techniky prostředí
Highest filtration class is recommended to customers living in places with stronger air pollution, regardless it's higher price and higher energy intensity due to higher pressure losses of more effective filters.

Filtration in HVAC units for forced ventilation of houses I.

13.6.2016 | Ing. Pavel Vybíral, Ph.D., Fakulta strojní ČVUT, Ústav techniky prostředí
Air filtration is basic operation for indoor air environment protection against solid and liquid pollutants. Beside human and natural activity pollutants there are bacterias, viruses and mildews.

Lion’s pond as a low temperature source of heat in ice arena

18.4.2016 | Ing. Vladimíra Linhartová
The pond loop geothermal refrigeration system at the Janesville Ice Arena uses an adjacent pond as a thermal storage. The most interesting in the ice arena is the main source for ice refrigeration, the water-source heat pumps and their condenser a city-owned pond that is adjacent to the building. Refrigeration heat is used for snow melt pit, ice resurfacing water preheat and underfloor heating.

Cinema microclimate elevation with monitoring and simulation

11.4.2016 | Ing. Zbyněk Děckuláček
This article documents the evaluation of internal microclimate (IM) cinema air-conditioning (HVAC). The primary method is an experimental monitory approach, which constitutes a secondary simulation solution. Monitoring is the application of the intelligent system which consist of many individual functual components. The monitoring results indicate the real state of IM. In the monitoring period its output enables its correct function with a comparison and a verification simulation. The simulation solution in the software enables a prognosis of the IM for random peripheral and operating conditions.

Practical Experience from Use of Induction Diffusers for Air Distribution and from Operation of Air-Conditioning Systems

21.3.2016 | Ing. Karel Matějíček, Časopis Vytápění, větrání, instalace
The author presents to professional community a broad experience, which he has acquired over the past decades during his work in the field of environmental engineering as a designer, implementer, systems operator and later also as a consultant. He informs the readers of his paper in the form of a personal message about the measures that he took based on his long time experience in order to improve current air-conditioning devices. The first part of the paper discusses practical experience with use of induction diffusers for air distribution in rooms. It concerns the experience with installation of induction units in window sills and discusses how does the location of the intake opening of secondary (induced) air in the front of the sill influences the air quality in the room. In the second part are described atypical installations of nozzles/jets arrays in suspended ceilings and partition walls, with possibility to quantitatively regulate the supply air volume according to the temperature and CO2 concentration in the room. These installation are suitable for „draught-free“ removal of bigger heat loads from heat sources scattered in the space, which cannot be ventilated locally and which are constantly operated. In the third part is described experience from dealing with problems concerning ceiling diffusers.
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