Archiv článků od 29.5.2017 do 25.9.2017

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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.

Comparison of different ways of heating in terms of energy consumption

21.8.2017 | Ing. Ondřej Hojer, Ph.D.
This paper describes the method of determining the heat losses resulting from the heat transfer to the space according to ČSN EN 15316-2-1. Based on a detailed comparison of the different heating methods considered for rooms with a room height higher than 4 m, their heat-sharing efficiency is evaluated.

What costs does a zero energy house have?

14.8.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze, Ing. Vilém Ťopek, Fakulta strojní, ČVUT v Praze
The article deals with the analysis of a possible solution of a non-energy residential building. The analysis shows what energy sources help to achieve a zero balance of non-renewable primary energy and what is not. In the contribution, the investment solution and the real operating costs of the energy-zero residential building compared to the current solution are shown for the selected solution and a simple payback period is set.

Law and Experts: Destruction of a double-jacket hot water heater with a reservoir structure tank in tank

7.8.2017 | Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí
The article presents a concrete example of a real operational problem with the use of so-called double-walled hot water heaters. The example is aimed at destroying the reservoir of the construction system tank in the tank due to a malfunction of the operating mode.
3 comments, last 10.08.2017 17:44
© Fotolia.com

Boiler Support – Solid Fuels Boilers

31.7.2017 | Ing. Zdeněk Lyčka
The article summarizes the experience, the boiler control issues, boiler operating characteristics and evaluation of the boiler exchanges.

Conversion of Solid Fuel Boilers Specifications (Efficiency and Emissions) as Required by EU Commission Regulation 2015/1189 ("Ecodesign")

24.7.2017 | Ing. Kamil Krpec, Ph.D., Ing. Jiří Horák, Ph.D., Ing. František Hopan, Ph.D., Ing. Petr Kubesa, VŠB-TU Ostrava, Výzkumné energetické centrum, Časopis Vytápění, větrání, instalace
With the advent of the EU Commission Regulation 2015/1189 on the ecodesign of the solid fuel boilers, there are beginning to emerge questions and ambiguities regarding the conversion of the efficiency and emission values reported in the protocols from the testing laboratories. The EU Commission Regulation introduces new evaluation of boilers specifications, which are seasonal efficiency and seasonal emissions. The calculation of the seasonal efficiency takes into account also the electricity consumption and potential production of electricity in a cogeneration boiler. The article mentions the formulas for the conversion of the boilers specifications according to the requirements of the mentioned Regulation. It also includes a model example.
Otopné těleco, ilustrační obrázek © Robert Kneschke - Fotolia.com

Effect of Heat Distribution Losses and Cooling of Heating Water on Design of Heating System

17.7.2017 | Ing. Jakub Spurný, Ing. Michal Kabrhel, ČVUT v Praze, Fakulta stavební, Časopis Vytápění, větrání, instalace
The article deals with influence of heat losses in distribution system and related cooling of heating water on the design of two-pipe counter-flow heating system. On the numerical reference model was studied the effect of distribution heat losses and cooling of the heating water on the heating system with mass flow rates designed by conventional calculation. In the following part were compared results from conventional design with design based on the numerical model which considered heat losses of the distribution system and cooling of the heating water. Mass flows rates were chosen as the compared variable, as they affect both thermal and pressure behavior of heating systems.
10 comments, last 25.07.2017 13:23

Law and expert: Aerating of heating systems

10.7.2017 | Ing. Jiří Matějček, CSc.
Revealing the cause of a faulty heating system in a residential building by over-aerating it can be far more complex than it appears at first glance. The impetus for the expert opinion was the complaint to the heating system operator that one riser of the heating system was repeatedly aerated and the heating element on the last floor was decommissioned.
1 comment, 04.09.2017 21:27

Thermal Stress and Noise Aspects of the Pipeline Networks Operation

3.7.2017 | Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, UCEEB - Univerzitní centrum energeticky efektiních budov, ČVUT v Praze, Časopis Vytápění, větrání, instalace
The paper is focused on the issue of the pipeline networks dilatation. From the perspective of the designer, it is a very simple and well-documented issue. However, as is shown in the article, if the basic requirements are not met when designing the pipeline networks, the results can be quite fatal.
1 comment, 06.07.2017 10:41

Is it possible to use the unused chimney vents to install drainage pipelines?

26.6.2017 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně, Ing. Waltr Sodomka
The unused chimney flue or strong wall of the chimney body offers the possibility of using it for conducting pipes etc. It is a prerequisite to keep the flue gas safety and operating mode of other installations. The article highlights the important factors of a possible decision.

Verification of Function and Effect of Return Water Temperature Control on a Solid Fuel Boiler in Connection with a Thermal Storage Tank

19.6.2017 | Ing. Jiří Horák, Ph.D., Ing. Lubomír Martiník, Ing. Kamil Krpec, Ph.D., Ing. František Hopan, Ph.D., Ing. Petr Kubesa, Ing. Vendula Laciok, Ph.D., VŠB-TU Ostrava, Výzkumné energetické centrum, Časopis Vytápění, větrání, instalace
This article deals with verification of function of Laddomat 21 (which mixes supply heating water with return water), verification of the time needed to heat up the thermal storage tank when using Laddomat with different thermostatic cartridges (required temperature settings) and effect of using this system on the pollutants emission in the flue gas.
1 comment, 19.06.2017 11:28
Bytové domy v Praze © TZB-info

What are the common parts of residential buildings in the Czech Republic?

19.6.2017 | Ing. Petr Bohuslávek, redakce
The definition of what is a common part of a residential building is essential especially when modifying the building structures and eliminating defects that affect both a common part and residential units. How common parts are defined affects who finances the modifications and reconstructions of such structures and parts. The definition of common parts is based on the new Civil Code (No. 89/2012 Coll.) and on the already abolished Act on Ownership of Housing (No. 72/1994 Coll.).

Law and Experts: Lack of hot water with a double-jacket heater

12.6.2017 | Ing. Jiří Matějček, CSc.
The article presents a concrete example of a real operational problem with the use of so-called double-walled hot water heaters resulting from the heat-technical properties of such water heaters.

What parameters must meet the heating boilers for solid fuels? Legislation in the Czech Republic and Europe in 2017

5.6.2017 | Ing. Jiří Horák, Ph.D., Ing. Lubomír Martiník, Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Ing. Jiří Dvořák, Ing. Milan Holomek, Ing. Stanislav Buchta, Strojírenský zkušební ústav, s.p., BRNO, www.szutest.cz, Ing. František Hopan, Ph.D., VŠB-TU Ostrava, Výzkumné energetické centrum, Časopis Vytápění, větrání, instalace
Since the combustion of solid fuels in heating boilers is attended by emissions of pollutants, in individual EU countries are gradually adopted different tightening requirements (emission and efficiency), which the appliance must meet. Requirements are targeted both the producers or importers of the combustion devices and theirs' operators. The aim of this article is to provide an overview of current and oncoming requirements and also show their comparison.
1 comment, 26.07.2017 16:26

Law and experts: Destruction of a solar thermal collector

29.5.2017 | Ing. Jiří Matějček, CSc.
The expert analysis reveals the cause of the mechanical failure of the solar collector as a result of non-adjustment of the control valves control to the operating states of the system. Simultaneous adjustment of the control valves eliminated the safety device from the function, when the pressure increased excessively and the collector leaked.

Changes of Flow Rate in the Counter-Flow Two-Pipe Heating System

29.5.2017 | prof. Ing. Jiří Bašta, Ph.D.
The paper seeks to provide a comprehensive view of counter-flow two-pipe heating system from the design perspective of the temperature parameters and related small or large flow rate through the system. It analyses the work of the thermostatic control valves, zone valves and riser valves in systems with small and large flow rate and on the basis of the analysis it evaluates their advantages and disadvantages. It also deals with hydraulic balancing of heating systems and works with the defined term “sensitivity to changes in flow rate”.
2 comments, last 29.05.2017 12:13
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