Archiv článků od 15.5.2017 do 16.10.2017

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Health safety of drinking water products (current requirements in the Czech Republic)

16.10.2017 | MUDr. František Kožíšek, CSc.
No foreign certificate can be used to verify the product for contact with drinking water in the Czech Republic. A foreign protocol on the leach test is sufficient if it is obvious that it is identical to the test specified in the Decree No. 409/2005 Coll.

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

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.

How should hygienists approach proposals for the use of cleaned waste water?

25.9.2017 | MUDr. František Kožíšek, CSc.
Many countries have developed their national regulations on requirements for one or more types of recycled water, to some extent depending on how these waters are used. Similar recommendations have been made by some international organizations.

How should hygienists approach proposals for the use of cleaned waste water? - part I.

18.9.2017 | MUDr. František Kožíšek, CSc.
What should be hygienists attitude to using recycled water? The approach should be unprejudiced, but critical, based on the precautionary principle. It can not be expected in the future that hygienists will particularly encourage water recycling in the Czech Republic, especially in contact with people and food.
3 comments, last 27.09.2017 11:28

Comment on Changing Z1 ČSN 75 5411 Water connections

4.9.2017 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
The change of Z1 ČSN 75 5411 was processed mainly due to the incorporation of water meter shaft requirements without the necessity for persons entry (so-called microshaft) into this standard. Current version of ČSN 75 5411 of April 2006 did not mention the water meter shaft without the necessity for entry of persons, and there were doubts as to whether such water meter shafts on the water connections are permissible.

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.

Decentralized water purification is still neglected

21.8.2017 | Ing. Karel Plotěný, Společnost ASIO, spol. s r.o. a ASIO NEW, spol. s r.o. ...
Models where the only solution is either a central cleaning or a balancing basin (the toilets are flushing) are long overdue even in Europe, just after several lines. For example, Germany officially withdrew from the effort to drain the whole country centrally in the 1990s when it judged that such behavior was both non-economic and non-ecological and "unsustainable".
2 comments, last 30.08.2017 06:58

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.
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