Archiv článků od 26.12.2016 do 14.8.2017

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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

Drain or re-use?

7.8.2017 | Ing. Martina Beránková, Ing. Dagmar Vološinová, Mgr. Lada Stejskalová, Ing. Elžbieta Čejková, VÚV TGM, v.v.i.
Now is the time when even in the Czech Republic we have to save water. In our households we can use grey water for flushing toilets, used water reuse for irrigation, etc. But we must not forget the risks associated with gray water re-use.
2 comments, last 10.08.2017 23:08
Vodoměrná šachta

Comment on Changing Z1 ČSN 75 5411 Water connections

31.7.2017 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
The change of Z1 ČSN 75 5411 was mainly processed due to the incorporation of water meter shaft requirements without the need to enter persons (so-called microshaft) into this standard. The current version of ČSN 75 5411 of April 2006 did not mention the water meter shaft without the necessity of entry of persons, and there were doubts as to whether such water meter shafts on the water connections are permissible.
2 comments, last 08.08.2017 16:44

Waste Water – Waste or Treasure?

24.7.2017 | Ing. Martina Beránková, VÚV TGM, v.v.i.
At the time of changing climatic conditions and reducing the quantity of raw material it is necessary to start saving water and raw materials. To achieve this target it is good to separate wastewater at the source and using of no-mix toilets. Czech legislation is not yet adapted to this alternative treatment of waste water.
1 comment, 24.07.2017 10:36

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.
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.

Solar collectors and heat pumps - what are their testing and parameters good for?

22.5.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The parameters and characteristics obtained from the laboratory test are used to compare products in terms of performance and efficiency. The results also serve for the correct design and evaluation of the year-round behavior of the element built into the entire thermal system.

How it is made individual heating rate calculation

15.5.2017 | Jarmila Trčková, vedoucí rozúčtovacího oddělení společnosti ista Česká republika
The article deals with the definition of consumer and basic heating rate. It is recommended to use the ratio of 50 % basic nad 50 % consumer rate or 60 % consumer and 40 % basic if individual heat meters are used.

What are the rules for paying for hot water?

8.5.2017 | Jarmila Trčková, vedoucí rozúčtovacího oddělení společnosti ista Česká republika
For individual payment calculation for hot water we need an invoice from heat supplier with the total cost of the property in CZK and with the amount of GJ. In addition, we need the water supplier invoice, which includes the total cost of water and sewerage. For the calculation then we need water consumption from water meters.
20 comments, last 19.05.2017 20:46

Influence of hot water tank size on heat pump energy consumption

1.5.2017 | doc. Ing. Tomáš Matuška, Ph.D., Ing. Yauheni Kachalouski, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Paper presents the analysis of water heating by a heat pump and influence of tank size, temperature setting and heat pump selection on annual use of electric energy.
7 comments, last 05.05.2017 12:11

Principles of the Safety Valve Installation

24.4.2017 | Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Vytápění, větrání, 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

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.

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

Sulfate attack resistance of fine-grained concretes in sewer system

27.2.2017 | Mgr. Martin Vyšvařil, Ph.D., RNDr. Markéta Rovnaníková, Ph.D., VUT Brno, Fakulta stavební, Ústav chemie
Sulfate attack is one of the major threats for durability of concrete in sewage collection systems where concrete sewer pipes are exposed to sulfates from waste water as well as from biogenic activity of bacteria. Damage due to sulfate interaction can result in the cracking and softening with loss of strength of concrete and it may lead to the concrete desintegration. Gypsum is the primary product of sulfate attack on concrete, after which ettringite is subsequently formed. Ettringite and gypsum are considerably larger in volume than the initial compounds, which leads to increased pressure within the concrete structure. This paper is focused on the sulfate attack on fine-grained concrete where the effect of 12 months contact of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, 5% sodium sulfate solution and solution simulating sewage water on various types of concrete has been investigated. The concrete specimens were characterized after exposition to the corroding media by their mechanical parameters, changes in pH and content of sulfates. It was found that after one-year exposure to sulfuric acid solution, the compressive strengths of all types of concrete significantly decreased. Sodium sulfate solution and the artificial waste water did not represent the significant corrosion environments for the concretes in terms of their strength reduction, increasing of sulfate ions content and the reduction in the pH of their aqueous leaches. The fine-grained concretes containing metakaolin and ground limestone showed the highest coefficient of corrosion resistance for the applied corrosive solutions.

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.

Determination of annual production of condensate in condensing boiler

2.1.2017 | Ing. Vladimír Valenta
The paper gives a simple method for calculating the annual production of condensate in the condensing boiler.

Labeling solar equipment, solar water heaters and solar kits for hot water

26.12.2016 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
This article summarizes the basic concepts of Commission Regulation EU 811/2013 and 812/2013, focusing on solar equipment, solar water heaters and solar packages. Describes the responsibilities of suppliers who place such products on the market.
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