Effect of devices that generate disturbances of chimney draft during operation of gas appliances, category B - Part 1

10.6.2013 | Ing. Jiří Buchta, CSc.  
In practice we constantly fix difficulties in applying the conditions for the correct placement of appliances category B, that take away combustion air from the sorrounding of the appliance and the flue gas is removed through the flue and chimney above the roof. It is important to mention that this category of appliance participates most in flue gas poisoning including poisoning with fatal aftermath, occurring in tens of cases in the Czech Republic for the year. It is caused by the incorrect application of regulatory requirements, ie in particular the TPG 704 01.
4 comments, last 16.06.2013 22:53

University Centre of Energy Efficient building (UCEEB) ČVUT

20.5.2013 | Ing. Antonín Lupíšek, doc. Ing. Tomáš Matuška, Ph.D. | Vytápění větrání instalace č. 2/2013
The University Centre of Energy Efficient Buildings is a newly established interdisciplinary research institute of Czech Technical University focused to energy efficient buildings having the healthy indoor environment that, at the same time, are environmentally friendly. The main objective for the Centre establishment is the development of technologies for the energy demand reduction and the efficient improvement of natural sources concerning new constructions and reconstructions of existing buildings. The objective is to be achieved by the holistic approach, the expert knowledge concentration from the field of architecture, construction, mechanical engineering, information technologies, and hygiene of indoor environment and the top instrument equipment of the Centre.

Equivalent sound level outside space in practice

6.5.2013 | Ing. Ondřej Jelínek, doc. Ing. Aleš Rubina, Ph.D., Ing. Zdeněk Tesař  
Acoustic microclimate is an important part of shaping not only inside but also the outside of buildings. The article presents a case study problems associated with measuring equivalent sound pressure levels in outdoor spaces to be protected buildings. In the text of the methods to remove negative acoustic performance, or what building solutions can be used for treatment of non-compliant, measurement findings.

Model for controlling of Air Handling Unit

22.4.2013 | Bc. Michal Lom, Ing. Václav Matz, Ph.D.  
This paper describes a general principle of air conditioning unit. Individual components and their functions of AHU are described. Finally, it is a model of AHU and the algorithm that is implemented as a software module in a programming environment. The created module is used for functional analysis and evaluation of energy behavior AHU.

Real reduction in energy consumption in existing buildings

15.4.2013 | Blueprint, firemní časopis Grundfos
The European Union is committed to reducing energy consumption in the built environment. Since the heating, ventilation and air conditioning (HVAC) represents approximately 11% of the total electricity consumption in Europe, these systems are an important part of the commitment of the EU. In this article, we discuss two specific aspects of HVAC energy efficiency, both are based on that understanding how the commercial buildings work in real life is the first step towards reducing energy consumption.

New requirements for evaluation of energy performance of buildings from 1^st April 2013

8.4.2013 | Ing. Miroslav Urban, Ph.D., prof. Ing. Karel Kabele, CSc., ČVUT Praha, Fakulta stavební, katedra TZB  
In connection with the implementation of the revised European Directive 2010/31/EU on the energy performance of buildings, certain legislative provisions such as Decree No. 148/2007, Coll. Replaced by Decree No. 78/2013, Coll. are currently amending. This article is focused on the changes associated with the energy certification of buildings, the "ENB", from the perspective of changes in the evaluation ENB.

Equivalent sound pressure level of interior space in practice

8.4.2013 | Ing. Ondřej Jelínek, doc. Ing. Aleš Rubina, Ph.D., Ing. Petr Blasinski  
Acoustic microclimate is an important part of shaping the internal environment of buildings. The effect of noise on the listener is becoming an increasingly important issue that must be addressed. Great emphasis must be placed on indoor climate, not only in the home, but also in the work environment, where the interior acoustics greatly affects the quality and efficiency of operations carried out. Although the health consequences of excessive exposure effects do not show immediately, unlike expressions fluctuations in temperature that our body records almost immediately, long-term exposure to noise damages the health of the individual, not only physically but also mentally. Troubleshooting Sound microclimate has nowadays many ways, both active and passive, and becomes an increasingly important component in the search for optimal solutions and balance of all components of the internal microclimate.

Use of the building in context to extreme boundary conditions of internal climate

1.4.2013 | Ing. František Vlach, Ing. Petr Hlavsa  
This paper examines the occurrence of extreme boundary conditions in the internal microclimate in the context of the intended use and structural design and technical equipment of the building. It refers to the occurrence of extreme conditions of the internal microclimate and the effects on constructions of buildings.

How to achieve a healthy indoor environment in buildings with almost zero energy consumption

18.3.2013 | Ing. arch. Klára Bukolská  
Achieving quality and healthy indoor environment in buildings with very low energy consumption means a holistic attitude from the initial design of the building to its operation. This attitude to design also raises the need for a holistic attitude to the measurement / evaluation of the structures, both in terms of quantitative indicators and qualitative.
4 comments, last 19.03.2013 10:04

Energy Sources Optimal Option for Low-Energy Houses

11.3.2013 | Ing. Václav Helebrant, STIEBEL ELTRON spol. s r.o. | Vytápění větrání instalace, č. 1/2013
The Autor employs himself in different accesses concerning the heating and the WSW preparation for low energy houses. He provides both general recommendations and shows specific solutions with relevant energy indicators.

Heat Reclamation

4.3.2013 | Ing. Pavel Vorreiter | Vytápění větrání instalace č.1/2012
The Author describes heating and cooling in administrative building of development and structural centre of the firm Velteko that utilizes heat gains from production machinery and technical elements equipping the interior in the dependency to the heat need, in his contribution.

Hygienic requirements for indoor building environment

25.2.2013 | Ing. Zuzana Mathauserová  
Each interior where people live, must be - to ensure a wholesome environment - ventilable and adequately ventilated. Our regulations, although they do not always speak the same way, provide sufficient evidence for the solution. But sometimes reality is quite different.
4 comments, last 26.02.2013 08:41

Steam Condensation Effect to Heat Recovery Exchanger Efficiency

18.2.2013 | Ing. Daniel Adamovský, Ph.D., Ing. Miroslav Urban, Ph.D. | Vytápění větrání instalace č. 2/2012
Condensation of water vapor in regular heat recovery heat exchangers is not an exceptional state, but its influence is usually neglected. In the article is described possible efficiency increase due to rise of transferred heat flux between cooled and heated air stream caused by latent heat from condensation of water vapor contained in air.

Effect of replacement of ecological refrigerant on cooling devices

4.2.2013 | Ing. Petr Vlček, Ing. Marian Formánek, Ph.D.  
The article deals with older refrigeration and air conditioning equipment which were originally using refrigerants that are nowadays already forbidden to use during repairs and for refilling systems due of envi-ronmental reasons. The text provides general information and knowledge gained from the experiment about phenomena associated with replacement of ecological refrigerant for the original refrigerant.
1 comment, 14.02.2013 17:54

Determination of working difficulty degree and microclimatic working environmental conditions in research greenhouses during the summer period

28.1.2013 | Ing. Ivana Tůmová, Ing. Petr Vaculík, Ph.D., prof. Ing. Pavel Kic, DrSc., Ing. Zuzana Štěrbová, Česká zemědělská univerzita v Praze, Technická fakulta, katedra technologických zařízení staveb  
This article summarises the results of research on work intensity in special greenhouses based on measurement of heart rate in correlation with microclimatic environmental working conditions in these greenhouses during the summer period of the year. According to the results of measurement the indoor conditions represented by operative temperature value were higher than value required by low in Czech Republic. In order to these facts, the general conclusion of this study is proposal appropriate operation mode for workers in so specific environment conditions.
3 comments, last 20.03.2013 10:48

New Experimental Ground Heat Exchanger in the FME BUT

21.1.2013 | Doc. Dr. Ing. Michal Jaroš, Ing. Antonín Kolbábek  
The contribution describes the building and configuration of a newly built ground heat exchanger (GHE), realized under the grant No. 3206/2011/G1 provided by Universities Development Fund of Ministry of Education, Youth and Sports CR. This GHE is designed as an accessory of experimental low-energy dwelling of FME BUT Brno exploited for education in the area of alternative HVAC systems. All relevant operating parameters (including temperature stratification of soil) are continuously monitored. Data acquired this way will be used for validation of recently developed numerical models as well as for later design and energy assessment of GHEs.

Monitoring of energy consumption of air-conditioning unit from project to real operation

7.1.2013 | Ing. Milan Drda, Ing. Josef Plášek  
The paper is focused on key aspects of design optimization of HVAC units from their energy consumption and from life cycle costs LCC point of view. This paper demonstrates and compares results from life cycle costs calculation with bonds to unit design including optimizing these costs in several cases of HVAC units. Last part of paper is dedicated to other key areas which were neglected until now, like continuous and appropriately monitoring of energy consumption of HVAC unit in real operation and continuous comparison with designed values. Therefore it allows effective interventions of operating staff and monitoring by owner or management.

Ventilation and Air-conditioning of the Nearly Net Zero Energy Buildings

10.12.2012 | Ing. Vladimír Zmrhal, Ph.D., prof. Ing. František Drkal, CSc.  
Directive 2010/31/EU of the European Parliament and of the Council on the energy performance of buildings requires that new buildings since 2018 (public buildings) and 2020 (all buildings) respectively were buildings with nearly net zero energy buildings. The requirement relates to the all technical systems of the buildings. The paper presents possible solutions in ventilation and air conditioning field in these buildings and presents considerations about possible developments with regard to the requirement of reducing energy consumption.

Comparison of simulations of structures with high heat-storage capacity

26.11.2012 | Ing. Roman Brzoň, Ing. Milan Ostrý, Ph.D., VUT Brno  
This paper deals with the issue of comparing simulations for steady and unsteady thermal state at the massive structures. In this paper, computer simulations are compared with real measurements and measurements of climatic data. The evaluation showed that the steady-state temperature can be comparing with real model used after the end of the accumulation phase. It is evident that the requirements for the temperature factor of the internal surface of the solid structures, set by legislation, are a safe assumption.

Pressurization of protected emergency exits in accordance to ČSN EN 12101-6

26.11.2012 | Ing. Jana Elstnerová  
The article informs about why and how to solve pressurization of protected emergency exits (hereinafter also referred to as the abbreviation of CHÚC). Design of protected escape route with permissible concentration of carbon monoxide only is not today's reality. Other toxic combustion products such as hydrogen cyanide, formaldehyde, hydrogen halides, oxides of nitrogen and other even at low concentrations make it difficult to escape from the danger area. For this reason, the standard EN 12101-6 for ventilation of protected escape routes does not deal with the dilution of smoke, but establishes criteria for maintaining of protected escape routes free from smoke.