Archiv článků od 28.8.2017 do 8.1.2018

zadejte vlastní článek

zpět na aktuální články       1  2  3  4  5  6  7  8  9  10  ...   

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
Analýza trvanlivosti preimyselných komínov © Imperium Obrazu - Fotolia.com

Analysis of the Durability of Industrial Chimneys

13.11.2017 | prof. Ing. Juraj Bilčík, PhD., Ing. Ivan Hollý, PhD., Ing. Natália Gažovičová, Stavebná fakulta STU Bratislava
Industrial chimneys are civil engineering works, which in addition to static and dynamic effects, direct and indirect loads, are also exposed to significant non-stationary environmental loads. Analysis of their durability focuses on the evaluation of vertical cracks, corrosion of concrete and reinforcement, which have a decisive influence on the resistance of the chimney's shaft with regard to the ultimate and serviceability limit states, as well as their durability.

Influence of Build-Up around Fireplace Inserts on the Time Course of Heat Output

6.11.2017 | Ing. Petr Kubesa, Ing. Jiří Horák, Ph.D., Ing. Kamil Krpec, Ph.D., Ing. František Hopan, Ph.D., VŠB-TU Ostrava, Výzkumné energetické centrum, Břetislav Holešínský, Cech kamnářů ČR, Časopis Vytápění, větrání, instalace
This article aims to broaden knowledge about behaviour of different types of local wood-burning heaters in term of time course of heat delivery into the room. The article presents a comparison of performance of the selected heater – fireplace insert, which was gradually rebuilt and tested as stove with/without accumulation heat exchanger and closed fireplace with accumulation in different stoking regimes. In the end of the article, the measured results are compared with previously obtained hea t output course of individually built stoves.

Unrenewable primary energy

30.10.2017 | Ing. Jiří Novotný, Ústav techniky prostředí, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Assessing energy performance of the building is also done from the point of view of the need for non-renewable primary energy. A common layman probably does not know what this means. At the same time, the need for non-renewable primary energy fundamentally influences the design of energy sources for heating, cooling, hot water preparation, etc. for a particular building. The need for non-renewable primary energy is one of the three main energy performance indicators of a building, and if it is assessed as too large, the building can not be validated.
9 comments, last 08.11.2017 14:31

Low-boiling liquids for heating systems

23.10.2017 | Ing. Jiří Matějček, CSc.
Heating systems, solar systems, primary circuits of heat pumps, etc. can be installed in the environment or exposed to operating conditions where their function must be guaranteed even at temperatures below zero degrees Celsius. In this case, pure water cannot be used to transmit heat energy. Low-setting (non-freezing) liquids consisting of a mixture of water and other substances are used to reduce the resulting freezing point to negative temperatures.
1 comment, 23.10.2017 21:25

What parameters must be met by stoves, fireplaces and solid fuel stoves? Legislation in the Czech Republic and Europe – situation in 2017

16.10.2017 | Ing. Jiří Horák, Ph.D., Ing. Lubomír Martiník, Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, VŠB-TU Ostrava, Výzkumné energetické centrum, Ing. Jiří Dvořák, Milan Holomek, Ing. Stanislav Buchta, Strojírenský zkušební ústav, s.p., BRNO, www.szutest.cz
Because of the emission of pollutants during the combustion of solid fuels in local household heaters (fireplaces and stoves) tightening requirements (emissions and efficiency) are gradually adopted in individual EU countries. The requirements are mainly aimed at manufacturers or importers of incinerators who have to prove their fulfillment when placed on the market. This is a different approach than hot-water boilers, where requirements are targeted not only on manufacturers and importers, but also on operators. This partly changes for the Czech Republic, where the Air Protection Act also introduces obligations for local furnace operators with a hot-water coil (part of the heat is supplied to the heating water from the source). The aim of this article is to provide an overview of valid and planned requirements and also to compare them.

Small solar systems for preparation of hot water (PWH) in family houses

9.10.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The author provides a basic overview of technical information on the issue of small solar systems suitable for family houses.
1 comment, 14.10.2017 00:10

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.

Utilization of overproduction of electricity from a photovoltaic power plant for heating and hot water production in a production area, part 1.

2.10.2017 | Ing. Petr Bican, Ph.D., Zdeněk Lovicar
The authors compare the measured data on the production and use of electricity produced by the solar photovoltaic power plant with the total electricity consumption in the production area of the company. The second part of the article is based on considerations about the use of overproduction of electricity for heating and hot water preparation and its economy.

Utilization of overproduction of electricity from a photovoltaic power plant for heating and hot water production in a production area, part 1.

25.9.2017 | Ing. Petr Bican, Ph.D., Zdeněk Lovicar
The authors compare the measured data on the production and use of electricity produced by the solar photovoltaic power plant with the total electricity consumption in the production area of the company. The second part of the article is based on considerations about the use of overproduction of electricity for heating and hot water preparation and its economy.

Reduced investment costs for heating in a residential building

18.9.2017 | Dr. Ing. Petr Fischer
Investments in heating systems of apartment houses are large and still growing. New modern components of the heating system are coming to market, which are further increasing the investment. Systems become more complex and therefore more susceptible to malfunctions. One solution can be the single-pipe hot water system.

Case study of heating savings due to glazing with increased solar factor

11.9.2017 | prof. Ing. Ivan Chmúrny, Ph.D., Stavebná fakulta STU Bratislava, Katedra konštrukcií pozemných stavieb
Case study of the energy need for heating of a family house depending on the thermal and optical properties of windows with triple glazing and the quantification of heat demand for heating.
© Robert Kneschke - Fotolia.com

Law and expert: Microorganisms in the heating system

4.9.2017 | Ing. Jiří Matějček, CSc.
Although the heating water is in a non-life-saving environment, it contains a minimum of nutrients and has an elevated temperature, microorganisms can be propagated under certain conditions. Depending on their type and amount, problems with excessive occurrence of gases in the heating system, smell and corrosion may occur. The most frequent cause of the introduction of microorganisms into the heating system is the storage of pipes in the outdoor environment without their ends being blocked, and then, of course, the purity of the water that is impregnated into the system.

Testing the heat loss of the hot water tank

28.8.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper deals with the experimental determination of heat losses of reservoirs (hot water storage tanks, heaters, heat reservoirs). It shows how the thermal loss of the tank itself, determined by the correct procedure in accordance with the standard, can be different from the loss of the reservoir connected to the thermal system.
zpět na aktuální články       1  2  3  4  5  6  7  8  9  10  ...   

Témata 2018

Partneři - Vytápění

logo FV PLAST
logo DANFOSS
logo THERMONA
logo ENBRA
logo GEMINOX

Spolupracujeme

logo Asociace odborných velkoobchodů

Doporučujeme

 
 

Aktuální články na ESTAV.czOd noci je uzavřen Libeňský most, tramvaje jsou odkloněnyKostel s obtížemi vzdoroval válce i totalitě. Dostal moderní skleněnou střechu a ožíváKonzultace a novinky Zehnder na veletrhu Infotherma a Moderní vytápění & DřevostavbyHELUZ školení realizačních firem 2018