Archiv článků od 21.11.2016 do 19.6.2017

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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 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

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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Potential of water from surface runoff as a source of non-potable water in the school building

26.12.2016 | Ing. Gabriel Markovič, PhD., Ústav pozemného staviteľstva, SvF, TU v Košiciach
Rainwater is largely perceived as a waste water in Slovakia and in the Czech Republic, which should be divert as soon as possible to the sewage system. For many years it was mostly only one way of drainage of buildings and paved surfaces generally called “conventional way” of drainage. This paper describes the possibility of using rainwater in the school building, on the basis of the measured volume of rainwater runoff draining from the roof construction. The data were compared with the theoretical values of the water needs for the building.
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The potential of alternative water sources using in the buildings

19.12.2016 | Ing. Gabriel Markovič, PhD., Ústav pozemného staviteľstva, SvF, TU v Košiciach
This paper describes measured data and evaluation of water consumption in a family house, where secondary source of water was introduced - water from a well. Potable water was fully replaced by well water for the purpose of flushing toilets and laundry . This paper also describes the measurement data of stormwater runoff from the roof of the school building as a potential alternative water source for this building. Next step was the comparison of the current potable water consumption in the building with inflowed rainwater and evaluation of its potential for supplying the object in case of accumulation of this water.
1 comment, 26.04.2017 22:46

Boiler room or boiler in each apartment?

5.12.2016 | Ing. Petr Vacek
Apartment buildings often deal with the question whether it is preferable to install gas boiler in every apartment or to build boiler room and transport heat to apartments. The article proposes a procedure to obtain information for decision.
21 comments, last 09.12.2016 07:21

Energy savings achieved by recuperative heat exchanger in real operation

5.12.2016 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze, Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí
Paper shows the results of laboratory testing of heat exchanger and its application in real operation in household. Although the efficiency of shower heat exchanger reaches even above 40 %, achieved energy savings for hot water preparation range between 10 and 15 %.
1 comment, 14.12.2016 22:05

Replacing old gas atmospheric boilers with new condensing, more economical and greener – Part 2.

28.11.2016 | Ing. Pavel Kvasnička, Bosch Termotechnika s.r.o. - obchodní divize JUNKERS, Ing. Michal Kabrhel, ČVUT v Praze, Stavební fakulta, katedra TZB
The introduction of stricter Ecodesign requirements for products associated with the consumption and production of energy is related to a smooth transition to the use of gas condensing boilers. In practice, exchanges of old boilers meet incorrect interpretation and perceptions about the benefits of condensing boilers. The article therefore assesses the impact of condensation theory and measurement and answers some practical issues.
5 comments, last 30.11.2016 00:11

Isolated systems - saving water in locations without utilities, II.

28.11.2016 | Ing. Karel Plotěný, Ing. Jan Vacek, ASIO, spol. s r.o.
There are a number of hydrogeological sites unsuitable for construction - there is nowhere to drain and building in the inappropriate area creates barriers to drain rainwater from the site. Then, the only solution is to minimize runoff.

Replacing old gas atmospheric boilers with new condensing, more economical and greener – Part 1.

21.11.2016 | Ing. Pavel Kvasnička, Bosch Termotechnika s.r.o. - obchodní divize JUNKERS, Ing. Michal Kabrhel, ČVUT v Praze, Stavební fakulta, katedra TZB
The introduction of stricter Ecodesign requirements for products associated with the consumption and production of energy is related to a smooth transition to the use of gas condensing boilers. In practice, exchanges of old boilers meet incorrect interpretation and perceptions about the benefits of condensing boilers. The article therefore assesses the impact of condensation theory and measurement and answers some practical issues.
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