Archiv článků od 20.11.2017 do 19.3.2018

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CO2 emissions and their impact on the assessment of sources in buildings

19.3.2018 | Ing. Jiří Novotný, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
One of the most well-known and most important greenhouse gases is carbon dioxide (CO2), which arises from natural processes, but the burning of carbonaceous fuels, especially fossil fuels, contributes significantly in the last century. This text focuses on CO2 emissions associated with energy transformations for the supply of energy to buildings.
3 comments, last 21.03.2018 08:45

Resistance of refractories against acidic environment

12.3.2018 | Ing. Daniel Mátl, Ing. Lenka Nevřivová, Ph.D., Ústav technologie stavebních hmot a dílců, Fakulta stavební, Vysoké učení technické v Brně
There are applications of refractory concretes for places where these are exposed to corrosive environments. This text deals with both description the corrosive effects and methodology of their testing. One of the most important properties of materials, affecting the chemical corrosion resistance, is their density. The second part of this text is focused on testing the refractory concretes which are currently used for applications. The aggregates were tested for the resistance to sulfuric acid.

Comparison of benzo[a]pyrene emissions from each source category

12.3.2018 | Ing. František Hopan, Ph.D., Ing. Jiří Horák, Ph.D., Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Ing. Milan Dej, Ph.D., Ing. Jiří Ryšavý, Ing. Vendula Laciok, Ph.D., Jiří Kremer, VŠB-TU Ostrava, Výzkumné energetické centrum
The aim of this paper is to compare BaP emissions from domestic heating, industrial emissions of BaP and BaP emissions from transport within the scope of the Czech Republic and individual regions of the Czech Republic using current balance approaches that are used for reporting BaP emissions for the Czech Republic under the Convention on Long-range Transboundary Air Pollution (CLRTAP).
8 comments, last 18.03.2018 12:35

Heat Sources for Buildings with Total Zero Energy Needs

5.3.2018 | prof. Ing. Dušan Petráš, PhD.
The author analyzes the conditions that create the criteria for heat sources to meet the requirements for buildings with almost zero energy consumption NZEB.
2 comments, last 05.03.2018 12:14

Installation and acceptance of hot-water heating systems

26.2.2018 | Ing. Karel Mrázek
When rebuilding the HVAC systems, it is necessary to respect the implementing regulations which define the framework of the certified technical procedures. In a number of examples of practice, it shows the absence of these facts. The article deals with the implementing standards and recommendations for the assembly and acceptance process of heating systems. It is designed not only for assembly companies, but also for investors and administrators who take over the work and then use it.

Detail of the chimney system passing through the combustible roof and ceiling structure

26.2.2018 | Ing. Zuzana Lacová, doc. Ing. Juraj Olbřímek, PhD., STU Stavebná fakulta, Bratislava, Slovenská republika
The detail of the chimney system passage is one of the possible details, from a fire point of view, that occurred due to the installation of new chimney systems in to the construction of the building. The chimney system passing through the combustible structure is one of the most dangerous details in the building, from a fire safety point of view, and as practice shows, is often very underestimated. An appropriate solution for the chimney passage requires the knowledge and correct design, as well as the realization and consequently correct use of the thermal appliance and the chimney system. The article deals with passage according to the requirements of the national standards for fire segments and design according to STN EN for chimneys.

Requirements for indirectly heated pressure cylinder water heaters

19.2.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Revised CSN EN 12897 “Water Supply – Indirectly heated pressure (closed) storage water heaters” applies to indirectly heated pressure container heaters up to a volume of 2000 liters usable in internal water conduits at overpressure from 0.05 MPa to 1.0 MPa. The author draws attention to important provisions of the standard that will be reflected in practice.

Change of heat supply from a central source to a domestic gas boiler room

19.2.2018 | Ing. Karel Mrázek
In the area of existing thermal energy supply systems, the processes of disconnection of existing heat consumers have been ongoing for a long time. The key point is correctness of the Energy Certificates. The article provides an example of a specific assessment of disconnection from central source heat supplier.
3 comments, last 05.03.2018 15:59
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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.

What requirements have to be met by a family house electrically heated a and what impact should a change in the primary energy conversion factor?

29.1.2018 | prof. Ing. Karel Kabele, CSc., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovtavební, katedra TZB, Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovVUT v Praze, Fakulta stavební, katedra TZB
Family houses with the concept of electric heating by means of an electric boiler or electric direct heating system and the preparation of hot water in an electrically heated tank do not meet the requirement for the energy performance of buildings. The authors analyze the magnitude of the conversion factor and other parameters that would meet ENB requirements.
© kange_one -

Requirements for new heat sources and boiler rooms in the Czech Republic according to Act No. 406/2000 Coll.

29.1.2018 | Ing. Karel Mrázek
Eco-design is a set of parameters (especially energy efficiency) that must be observed by the supplier (the manufacturer or importer) of the energy-related product when it is placed on the EU market or into operation. The article provides an overview of requirements for new sources and boiler rooms in relation to implemented regulations.
1 comment, 29.01.2018 07:33
© M-Rido -

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 ecological effect of installing condensing gas boilers

22.1.2018 | Ing. Pavel Kvasnička, Ph.D., Bosch Termotechnika s.r.o. - obchodní divize JUNKERS, doc. Ing. Michal Kabrhel, Ph.D., ČVUT v Praze, Fakulta stavební
The authors analyze the ecological parameters of gas condensing boilers, the presence of these boilers in operation and estimate future developments. On the basis of the analysis, they conclude how favorable the transition to condensing technology will be reflected in the production of undesirable emissions of nitrogen oxides.
10 comments, last 22.01.2018 19:38

Replacing the old atmospheric gas boiler with a new condensing boiler

8.1.2018 | Ing. Josef Hodboď, videoreportáž: Ing. Petr Bohuslávek, redakce
The text and video describe a typical replacement of the old suspended gas boiler in the apartment. The reason for the exchange was not only the effort to save gas but also to protect our health and life, ie to eliminate the risks associated with older boilers with the air supply from the room.
12 comments, last 12.01.2018 18:41

What is the consumption of cold and hot water in the apartment house in Bratislava?

8.1.2018 | Ing. Milan Krafčík, doc. Ing. Jana Peráčková, PhD., Stavebná fakulta, STU Bratislava
The paper presents the results of the experimental measurement of cold and hot water flows in the reconstructed pipeline of a residential building. The measured flows are compared to the calculation values according to STN 73 6655, DIN 1988-300 and the values computed by the calculation program. The results can be applied to the optimization of the design of internal water mains as well as the optimization of the design of the hot water preparation plant and its heat source.
1 comment, 12.01.2018 13:29

Eco-design and energy labeling of local heaters

18.12.2017 | Ing. Zdeněk Lyčka
Local heaters are other products for which the Eco-design and Energy Labeling Rules start to apply from January 2018. Obligations are not introduced for all types of heaters at a time, but will be applied until 2022, when local solid fuel heaters will apply for the last category of a large family of these small heat sources.

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.

Consequences of an inappropriate combination of pipe materials and untreated circulating heating water

4.12.2017 | Ing. Miroslav Machalec
It is generally known that the combination of inappropriate materials and the chemical composition of the heating water can cause serious failure of the heating system. However, from time to time, due to lack of supervision by the designer on the construction site (the investor does not order it, because he thinks he is expensive and unnecessary according to suppliers) and unprofessional construction supervision, there are cases that document the violation of perhaps all the principles that could be found. The occurrence of the accident, the financial damage, is then quite legal.
8 comments, last 18.12.2017 16:20

The relationship between the need for heat and cold and the size of transparent structures of a family house

27.11.2017 | Ing. Peter Buday, PhD., Ing. Rastislav Ingeli, PhD., katedra KPS, SvF STU Bratislava
The trend of residential buildings is to improve energy efficiency, improve the quality of the indoor environment, improve building and technical condition of the building, minimize the cost of building operation and overall maintenance. When designing buildings, elementary analysis requires all factors that have a significant impact on energy efficiency. One is also the ratio of transparent structures to non-transparent structures. In this paper, we analyze the ratio of transparent structures to non-transparent structures to the need for heat for heating and the need for energy for cooling.
1 comment, 02.12.2017 21:45

Softening and desalination of heating water, corrosion, self-alkalization

20.11.2017 | Ing. Josef Hodboď, redakce
The requirements for heating water quality are increasing with the increasing technical level of equipment from which the heating systems are assembled. Parameters of common water are therefore modified in various ways, altered to match as much as possible the desired ideal state. If these processes do not take place due to the material composition of the heating elements, damages occur. Even in a relatively short time since commissioning. The most common ways of changing water parameters are adding inhibitors, softening water and desalting water.
1 comment, 24.11.2017 13:39
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