Archiv článků od 9.1.2017 do 24.4.2017

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Principles of the Safety Valve Installation

24.4.2017 | Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Větrání vytápění instalace
The article deals with the issue of safety valves installation for water heaters. Neglecting of the installation conditions often causes damage to the installed appliance, or (as shown in the paper) loss on the water and sewer charges in the case of a safety valve installed in the water heater safety group.
1 comment, 26.04.2017 09:23

Study of the properties of heating radiators and convectors

10.4.2017 | Ing. Jindřich Boháč, Ing. Roman Vavřička, Ph.D., Ústav techniky prostředí, Fakulta strojní, ČVUT v Praze, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The paper focuses on the analysis and experimental comparison of operating characteristics of various types of radiators. The first part contains a brief search of radiators available on the Czech market. The following is the theoretical analysis of the thermal inertia of the selected objects, both in the phase of start-up and cooling-down. This analysis serves as a basis for evaluating operating performance. Additional consideration by the parameters of the radiator in this study are the geometrical characteristics (the criterion of the space occupied by the dimensions of the body and the size of the transfer surface on the air side), the weight criterion (radiators without heating fluid) volume criterion (heat-carrying substance in the body). Each of the above criteria is related to nominal thermal output.
12 comments, last 25.04.2017 10:29

Evaluation of annual savings when replacing old heating source for new heat source in terms of the cost of fuel or electricity

3.4.2017 | Ing. Jiří Horák, Ph.D., Ing. Petr Kubesa, VŠB-TU Ostrava, Výzkumné energetické centrum
App update guidance for evaluating annual savings when replacing old heating source for new heat source in terms of the cost of fuel or electricity gives the incorporation of new terms from the current challenges – 67. Challenge OPE 2014-2020 PO2, SC 2.1 – Call for county no. 2. Furthermore, the application has been added to the choice of the heat pump and condensing boiler in comparison with the previous version. The application allows you to get information about the final amount of the subsidy, the approximate evaluation of possible financial savings in terms of fuel costs and electricity and return in the implementation of the exchange of the old solid fuel boiler in detached houses as a new source of heat.

Security Devices water heaters: The temperature or pressure?

20.3.2017 | upraveno podle J. B. Hall, Ph.D., Ing. Petr Blasinski, Ph.D., Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
The article summarizes overview of ways to secure water heaters in Europe, which became the basis for design of integrated methodology applied in the Czech Republic.

Remove Gas from Heating Systems

13.3.2017 | Ing. Jaroslav Dufka
Remove gases from the water and all equipment in heating systems is one of the basic prerequisites for proper operation.

The invention, patent or utility model - who should sort?

8.3.2017 | Ing. Zdeněk Lyčka
The article explains the differences between the invention patents and utility model from the perspective of Czech legislation. Also highlights the confusion individual categories and purposeful fraud by producers and sellers of equipment.
1 comment, 08.03.2017 07:44

Summary Evaluation of fuel and energy consumption in Czech households by 2015

6.3.2017 | Ing. Vladimír Stupavský, redakce
Czech Statistical Office published in the February 2017 data from a large sample survey in Czech households with an Energy 2015. This survey was focused mainly on the consumption structure and methods of use of particular fuels and energy. The data focus on historical comparisons and consumption trends from 1991 to 2015. The statistics include methods of thermal insulation of housing, fuel used for heating and hot water, the average consumption of Czech households, types of heating sources, etc.
2 comments, last 11.04.2017 14:25

Model predictive control as a tool for ensuring and reduction of negotiated heat output

6.3.2017 | Ing. Jiří Cigler, Ph.D., Feramat Cybernetics s.r.o., Ing. Petr Kudera, Energocentrum Plus s.r.o.
Total cost of heating energy typically consists of two items. The former is the payment for consumed energy while the latter is the payment for reserved power capacity or reserved energy capacity in given period. If the customer pays for the reserved power capacity, he/she should address two questions: what is the most suitable level of reserved capacity and how to control the heating system so that the reserved capacity limits are not exceeded. Both questions can be readily solved with the aid of model based predictive controller.
6 comments, last 09.03.2017 09:32

Burning of unapproved fuel in boilers can be penalized by return of subsidies and penalty

28.2.2017 | Daniela Petržilková, Frank Bold Advokáti, s.r.o.
Obtain subsidy for a new boiler and then use it for unapproved fuel burning? There are cases of sellers telling people that it's okay. Such behaviour is of course illegal and the owner of the boiler in such case faces return of subsidy and a financial penalty. The seller on the other hand has nothing to worry about, since he places all the risk on the buyer.

Balance of emissions from Czech households solid fuels heating

27.2.2017 | Ing. František Hopan, Ph.D., Ing. Jiří Horák, Ph.D., Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Ing. Milan Dej, Ph.D., VŠB-TU Ostrava, Výzkumné energetické centrum, Ing. Vendula Laciok, Ph.D., VŠB – Technická univerzita Ostrava, Výzkumné energetické centrum, ČR
The article deals with the determination of emission factors of pollutants from household heating with solid fuels. It also gives the value of specific emissions of PM, CO and TOC and emission balance of household heating in 2001, 2015 and three possible scenarios for the year 2021.
20 comments, last 06.03.2017 19:22

Amendment to the European standards for calculations chimneys

22.2.2017 | doc. Ing. Vladimír Jelínek, CSc.
Design and calculation of chimneys includes European standard EN 13384-1 Chimneys - Thermal and hydraulic calculation methods - Part 1: Individual chimneys and EN 13384-2 Chimneys - Thermal and hydraulic calculation methods - Part 2: Common chimneys
1 comment, 22.02.2017 23:20

Primary energy savings and CO2 savings by using biomass microCHP plant

20.2.2017 | Ing. Jakub Maščuch, Ph.D., Ing. Petr Mydlil, ČVUT UCEEB
Paper describes selected effects of implementation of biomass microCHP generation in Czech legal conditions. Selected demonstration of biomass CHP is described and basic operational energy balances are presented. Comparison of microCHP and ordinary biomass boiler energy balance were performed. MicroCHP technology WAVE, which is being developed at CTU UCEEB in Buštěhrad, is described. Operational parameters of WAVE and future development outline were discussed.
16 comments, last 27.02.2017 11:18

Are balancing valves still needed?

20.2.2017 | Ing. Miloš Bajgar
As a legal expert I often deal with inadequate heating system function. What is common to these devices? Missing balancing valves. It is not possible to assess the flow in connected terminal units that would ensure the necessary transmission capacity from the heat source to the terminal units.
4 comments, last 21.02.2017 22:47

Comparison of the operating costs of the hybrid system (gas boiler with electric geyser) and electric system (electric ceiling heating with geyser)

13.2.2017 | Ing. Lenka Reinberková, Ph.D., Ing. Zdeněk Reinberk, Ph.D., redakce
In the previous article we have focused on electricity consumption in the years 2010 to 2016. In this article we try to compare the operational costs with our neighbour's flat of similar size, heated by different source.
12 comments, last 15.02.2017 18:09

Thermal energy prices and their development to year 2016

9.2.2017 | Ing. Josef Hodboď, redakce
ERU has compiled the inventory of actual prices of thermal energy for holders of licenses for the production and distribution of thermal energy on 31. 12. 2015 and prior to the year 2016. The office added it to historical data since 2006, so it contains last ten years.
3 comments, last 16.02.2017 15:06

Extract from the TPG 934 01 Gasometers. Placing, connecting and operating

8.2.2017 | doc. Ing. Vladimír Jelínek, CSc.
Brief summaries of legislation in particular contain information about products with higher technical, technological and intelligent level, specifies requirements for installation and construction works, which require new measurement technology and represents a variant location measuring devices, especially in relation to other installation systems (electro).

Changes for the second round of grants for the replacement of old boilers

2.2.2017 | Ing. Zdeněk Lyčka
The Ministry of Environment intends to publish the changes for the second round of grants for the replacement of boilers in March 2017. Prefer to be renewables, coal-fired boilers will have less support than before. Until now, the accepted 26,000 applications for grants, money is one-third depleted.
1 comment, 02.02.2017 11:13

The project and necessary administrative tasks

30.1.2017 | Ing. Lenka Reinberková, Ph.D., Ing. Zdeněk Reinberk, Ph.D., redakce
In the previous article we described our decision-making process. At the end of this process we decided to install electric radiant ceiling heating panels. In this article you can read how we have realized it.

Energy Label of Solar Water Heaters

30.1.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov (UCEEB) ČVUT
The article deals in detail with the solar water heater from the EU Commission Regulation 812/2013. It describes what information provides the label and how it originated classification in the relevant energy efficiency class water heating.

Reducing of Noise from Sources of Heat and Propagation of Sound

9.1.2017 | Ing. Miroslav Kučera, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Větrání vytápění instalace
The paper presents an example of solving the propagation of noise from an air/water heat pump installed in the basement of an apartment building. Air intake and exhaust are brought out on the façade of the building, where it is calculated the noise situation in the protected exterior of the building. In the interior it is solved the propagation of sound from the plant room to the protected interior space. In conclusion, the results are compared with the data from the report on measurement at the realized work.
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