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Archiv článků od 1.9.2014 do 5.10.2015

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14.9.2015
Ing. Martin Němeček, doc. Ing. Miloš Kalousek, Ph.D.

The article deals with basic knowledge about the thermal storage mass of energy passive buildings in relation to the summer thermal stability under the climatic conditions of Central Europe. Article lightly touches on the issues of heat storage of buildings with lightweight construction system like a modern sandwich wooden houses.

17.8.2015
Ing. Petr Červený, VOŠ a SPŠ Volyně

The paper deals with complex solution of heating and economy measures regarding ecology of heat sources and preservation of architectural values of the Volyně college-complex. This solution also includes padding warm and exchange of windows in all complexes. New technology in boiled room was installed with application of boiler for fytomass-burning, gas condensation boilers, thermal pump in system air/water and cogeneration unit for supply electric energy.

13.7.2015
Ing. Olga Rubinová, Ph.D., doc. Ing. Aleš Rubina, Ph.D, Ing. Jiří Bernard, Ing. Lukáš Frič

This part focuses on the issue of collecting samples of the microbial environment in the houses near Brno. The aim is to find suitable methods that are applicable in practice, reasonably expensive and describe well the state of the microbial element of environment, in order not only to evaluate air quality, but also to find the source of detected state. Investigations were carried out in houses equipped with air condition and also compared with natural ventilation.

8.6.2015
Ing. Olga Rubinová, Ph.D., doc. Ing. Aleš Rubina, Ph.D, Ing. Jiří Bernard, Ing. Lukáš Frič

These series of articles focuses on the issue in terms of microbial purity level in internal environment, ventilation and heating systems of residential buildings. The issue relative to its scope is divided into several parts, following: Microbial microclimate of buildings and its limits, Collection and cultivation of samples from the family houses, Rating of family houses, Microbial microclimate in educational establishments, Heating surfaces and microbial environment.

The aim of this set of articles is to present methods and results of the subsequent mapping of microbial contamination of the interior of buildings to technical specialists and readers. The questionnaire survey will enable us to evaluate an impact of the MEP systems for indoor environmental quality, especially its microbial component. Those articles will present the work and the results processed in the framework of the specific research Brno University of Technology, Faculty of Civil Engineering, Institute of technical equipment of buildings under project FAST-S-15-2620.

1.6.2015
Ing. Jindřich Hvížďala, M-tech, s.r.o., Pardubice

The use of refrigeration systems – heat pumps for heating of family houses and apartment buildings is nowadays common practice. Only the appropriately designed and operated systems provide required technical parameters, bring energy savings and assures their long life-time. However, fundamentally different are operational conditions of refrigeration system (with so called direct evaporation) which will be used as a cold source and eventually as a heat source for air-handling unit. This has been proved by negative experience with some already installed systems, which concerns especially winter season operation during zero and sub-zero temperatures of outdoor air, but also cooling during transitional and summer season operation. The author tries to share his personal experiences with designing, realization and operation of these systems up to the refrigerating capacity about 100 kW, which occupy the crucial part of our market.

25.5.2015
Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Univerzitní Centru energeticky Efektivních Budov ČVUT v Praze

The paper deals with measurement of high surface temperatures by thermography method. The author verified by several experiments the theoretical assumptions of usability of contactless measurement of high temperatures. The experimental verification is focused on spectral sensitivity range of contactless devices and on application of special coating on measured surface. The ending of the paper is devoted to the influence of boundary conditions on the accuracy of the measurement.

11.5.2015
Ing. Daniela Hurtíková, Stavebná fakulta STU v Bratislave, Katedra technických zariadení budov

Since the oil crisis of the seventies, the interest given to buildings physics, indoor climate and energy use has strongly increased. Outside air quality in the cities in developed countries has improved significantly in recent decades. During the same period, also the quality of indoor environment has reduced. It is the impact of energy savings, reduced ventilation and the introduction of many new materials and sources of indoor pollution.

The indoor environment of buildings is that part of the environment in which the person is immediately acted on by the construction of the building, its technical equipments, including environmental equipments and a whole set of factors of internal environment. Comfortable indoor environment is essential to productivity, happiness and satisfaction of building users. European standards provide guidelines for what should be comfortable in terms of indoor climate. However, there is often a contradiction between the theory mentioned in these instructions, and real comfort for the user of the building.

Standards and guidelines for estimating the required minimum ventilation rates that we have today are not completed. The objective is to be able to calculate a straight the required ventilation rate, such as calculations for cooling and calculations for heat loads.

This paper is devoted to the assessment of the indoor environment of the building based on the individual components of the microclimate.

27.4.2015
Ing. Daniela Hurtíková, Stavebná fakulta STU v Bratislave, Katedra technických zariadení budov

The directive 2002/91/EC (EPBD, 2003) of the European Parliament and of the Council on the Energy Performance of Buildings (“Directive on the Energy Performance of Buildings Directive”, EPBD) was adopted after a lively discussion at all levels and with the full support of all Member States and the European Parliament on 16th December 2002 with the entry into force on 4th January 2003. The EPBD is considered a very important component of the legislative activities of the European Union aimed at energy efficiency, which is designed to meet the Kyoto Protocol and satisfies the requirements arising from the Green Papers on security of energy supply.

A recent European Commission Concerted Action focuses on energy performance (“Delivering potential”, October 2006) provides for energy efficiency in the building sector as a top priority. It foresees a key role in the implementation of the EPBD savings potential in the building sector, which is estimated at 28 %, and which may reduce the overall energy consumption in the European Union by about 11 % [2].

This paper is devoted to the various parts of the energy evaluation of buildings according to current European standards.

9.2.2015
Ing. Stanislav Toman, Projektová kancelář ÚT+VZT

The published paper summarizes the crucial information about the actual topic – garage ventilation in the Czech Republic. The contribution is divided into three parts, due to the broad scope of the matters. The series of the papers is based on the legal and normative enactments. It reflects the new situation of natural gas powered vehicles parking possibilities and it discusses every ventilation system which can be found in garages. It deals with design principles of service ventilation, definition of emergency ventilation and basics of fire ventilation. The paper also deals with related issues such as control systems, operating regimes, detection and monitoring of pollutants, explosive atmosphere risk assessment and protocol determining external influences. The contribution is aimed not only to HVAC designers, but also to architects and designers of all related construction fields. Valuable information can be found also by the other interested groups such as investors, developers, suppliers, operators, building authorities, involved state administration bodies, etc.

2.2.2015
Ing. Zuzana Mathauserová

If you ask hygienist, how to define the term " indoor environment quality", the aswer will be: A set of physical, chemical and biological environmental factors. All of these factors should have - if possible, and the current state of knowledge it allows - hygienic limits as insurmountable values, protecting human health.

26.1.2015
Ing. Stanislav Toman, Projektová kancelář ÚT+VZT

The published paper summarizes the crucial information about the actual topic – garage ventilation in the Czech Republic. The contribution is divided into three parts, due to the broad scope of the matters. The series of the papers is based on the legal and normative enactments. It reflects the new situation of natural gas powered vehicles parking possibilities and it discusses every ventilation system which can be found in garages. It deals with design principles of service ventilation, definition of emergency ventilation and basics of fire ventilation. The paper also deals with related issues such as control systems, operating regimes, detection and monitoring of pollutants, explosive atmosphere risk assessment and protocol determining external influences. The contribution is aimed not only to HVAC designers, but also to architects and designers of all related construction fields. Valuable information can be found also by the other interested groups such as investors, developers, suppliers, operators, building authorities, involved state administration bodies, etc.

5.1.2015
Ing. Miroslav Machalec

A sophisticated system of ventilation and cooling (air conditioning) in representative rooms of the valuable historical building of the Olomouc town hall is described in the paper (see pic. 1).

After a complex and detailed technical and historical survey it was decided to use the original chimneys and their flues, at present out of operation (see pic. 5) for bringing the air into the rooms. The flues were milled and steel liners were inserted, in order to bring the air into the conditioned rooms. Thanks to this solution – responsive and witty in the same time – the vaults and murals in the ceremonial hall and adjacent service rooms remained intact.

Within the rooms the air is distributed through very flat pipes laid into the cinder embankment under the wooden parquetry that had to be repaired, too. In the same time new cables for sound and security systems, until now missing, were installed under the floor. The air is brought into the rooms through the slot diffusers, integrated into the carpets. The cooling units were installed under the renovated window sills.

Similar system was implemented in the mayor´s office, his or her secretariat and a great reunion hall.

15.12.2014
Ing.arch. Ondřej Pleštil

This paper deals with the reconstruction of the historical building of the cinema “Varšava” in Liberec, Czech Republic. The building designed and built in the 1920s by the german Liberec architects Effenberger and Noppes is both valuable architectural and constructional monument. However, it has suffered from faulty partial reconstructions done during the 20th century and during 8 years of closure of the building in 2008. For salvation of the building, a a new civic association “Save kino Varšava” was established in 2012. Now, it tries to halt further decay of the valuable monument at start a process which would convert the old cinema to a modern multifuctional hall of the 21th century in the future. Recently, the foyer is reconstructed and minor reconstructions in the hall are taking place. This paper deals mostly with restoration of the original ventilation system and dry rot fungus treatment.

8.12.2014
doc. Ing. Martin Jiránek, CSc., ČVUT v Praze, Fakulta stavební

Principles of designing and realization of radon preventive measures according to the Czech technical standard ČSN 73 0601 (2006) are described. Dimensioning of radon-proof membranes is explained and requirements for soil ventilation systems and air gaps ventilation are presented.

24.11.2014
Ing. Jiří Šála, CSc., ŠÁLA MODI, Praha

From a functional point of view is mechanical ventilation the only system that gives the guarantees necessary exchange of fresh air, which is necessary in spite provide fresh air in a given time and quantity. The advantage of this method is the possibility of air exchange energy-saving solution - first option controlled exchange according to the needs of individual spaces, which excludes excessive ventilation, secondly the possibility of installing ventilation heat recovery that often uses more than 80% efficient heat from exhaust air for preheating fresh (no mixing). In the case of radon risk would be appropriate to prescribe these systems.

27.10.2014
Ing. Stanislav Toman, Projektová kancelář ÚT+VZT

The published paper summarizes the crucial information about the actual topic – garage ventilation in the Czech Republic. The contribution is divided into three parts, due to the broad scope of the matters. The series of the papers is based on the legal and normative enactments. It reflects the new situation of natural gas powered vehicles parking possibilities and it discusses every ventilation system which can be found in garages. It deals with design principles of service ventilation, definition of emergency ventilation and basics of fire ventilation. The paper also deals with related issues such as control systems, operating regimes, detection and monitoring of pollutants, explosive atmosphere risk assessment and protocol determining external influences. The contribution is aimed not only to HVAC designers, but also to architects and designers of all related construction fields. Valuable information can be found also by the other interested groups such as investors, developers, suppliers, operators, building authorities, involved state administration bodies, etc.

Školní třída © Tyler Olson - Fotolia.com
15.9.2014
Jie Gao, Pawel Wargocki, Yi Wang

This article presents the measurements of indoor climate in classrooms in the same school in Denmark. The classrooms had different ventilation systems: Ventilation was achieved either by manually operable windows, or by automatically operable windows with and without an exhaust fan in operation, or by a balanced mechanical ventilation system. Indoor air temperature and carbon dioxide (CO2) concentration, as well as opening of windows were continuously monitored for one month in the non-heating and heating seasons; measured CO2 concentration was used to estimate average classroom ventilation rates. The results show that mechanical ventilation and natural ventilation with automatically operable windows with exhaust fan performed notably better than the other systems. They indicate also that opening of windows was largely affected by customs and habits. Present results can be used as the basis for rational selection of systems that ensure adequate classroom ventilation.

1.9.2014
Ing. Jaroslav Bambous

Nowadays implemented and operated buildings services do not fully utilise current technical industry standards. The reason is not only a pressure for investment cost cutting, but also professionalism level of investor’s consultants and planners. Another negative impact has reducing time for both project preparation and realization.
Disproportionate cost cutting of operation and energies leads to suppressed running of technical equipment. Additionally the reducing of staff and qualified personnel results in ineffective way of operation. Technical capabilities of installed devices are not properly and fully used, so the required technical parameters are not followed in air conditioned spaces.


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