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Hot water supply for water mains in buildings, Part II.

13.8.2018 | Ing. Jaroslav Dufka
On average, every citizen of the Czech Republic consumes about 40 liters of hot water per day. Approximately 2.2 kWh of thermal energy is consumed to heat this water.

Hot water supply for water mains in buildings, Part I.

6.8.2018 | Ing. Jaroslav Dufka
We choose the water heater based on the availability of fuel and the need for water. What are the costs of water heating, how to select the stack size and how to read the energy label of the appliance?
2 comments, last 08.08.2018 09:00

Floods and flood risk changes in the context of history and possible future

6.8.2018 | RNDr. Jan Daňhelka, Ph.D., Český hydrometeorologický ústav
The share of population exposed to flood risk tended to grow slightly. Compared to the world, however, the proportion of people at risk of floods in the Czech Republic is very small. In the future, it is possible to achieve an even greater degree of adaptation (resilience) to floods.

Water elements – technology and operation

23.7.2018 | Ing. Zdeněk Žabička
Historic gardens served for closed groups of people. Today, gardens and parks are mainly used by the general public, with all the negative influences that flow from it. The article also mentions requirements for technical solutions of water elements, including operational requirements.

ISH Shanghai & CIHE returns with an elevated sourcing experience for the East and Central China market

14.7.2018 | Messe Frankfurt (HK) Limited
ISH Shanghai & CIHE, the sister show of ISH China & CIHE in Beijing, will return to Shanghai New International Expo Centre from 3 – 5 September 2018 as the show cements its position as the most influential HVAC and home comfort exhibition in East and Central China.

New European Standard for Rainwater Utilization

9.7.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
In January 2018, the new European Standard EN 16941-1 On-site non-potable water systems – Part 1: Systems for the use of rainwater was issued. This European Standard will be issued in the Czech Republic in July 2018 in the English version.

New Administrative Centre of Lesy České republiky

25.6.2018 | prof. Ing. Josef Chybík, CSc., VUT Brno, Fakulta architektury
It is expected that the new administrative centre of Lesy České republiky would be an exemplary demonstration of the use of wood, which will be used in the form of the building material or in which the importance of wood will be emphasized in another appropriate way. The paper is focused on a proposal that won the international architectural competition in 2016.

How to improve the city? Let's have a chance of water and greenery!

4.6.2018 | Ing. Marie Nehasilová
Appropriate measures make it possible to approach the water regime in cities in nature to mitigate negative impacts of urbanization. There are also many implementations in the Czech Republic that return water and greenery to cities.

Smart Metering utilization in energy settlement systems – part one

28.5.2018 | Bc. Jiří Vastl
The thesis is focused on smart metering system and ripple control. The first theoretical part describes function of ripple control. The second theoretical part presents smart metering technology with introduction of a new system of energy settlement. The new system of energy settlement use prices in the intraday market which are published on Electric grid operator’s website. The system can be considered as a dynamic tariff. The system of energy settlement is demonstrated on consumption of the family house. The comparison of both systems is demonstrated in the final part of the thesis.
4 comments, last 08.06.2018 15:55

Application of Selected Sorbent Materials in Removal of Bromates from Water

21.5.2018 | Ing. Ivana Marko, doc. Ing. Danka Barloková, PhD., prof. Ing. Ján Ilavský, PhD., Slovenská technická univerzita v Bratislave, Stavebná fakulta, Katedra zdravotného a environmentálneho inžinierstva
Bromates (BrO3) are classified as hazard substances that can cause carcinogenic diseases. They belong among the elements that are not commonly found in analysis of the drinking water. Bromates appear as by-product from water disinfection by ozone in the water, that contain the higher concentration of bromine ions (BrO). There are several physical and chemical processes that can be used to reduce the concentration of bromates. Adsorption is one of the most frequently used methods for removal of the hazard substances from the water. It allows the application of various type of sorbent materials for instance: active coal, zeolite, GEH, and the other materials with base of iron hydroxide.
The main aim of this work was to ensure the removal of bromates from the water source Dvorníky (Slovak Republic), with selected sorbent materials: granulate active coal, zeolite, GEH, Bayoxide E33, Read – As, Klinopur – Mn, and activated alumina. The results of the laboratory tests are present in the experimental part.

Determination of membrane expansion vessel size for water heaters

14.5.2018 | Ing. Vladimír Valenta
Water increases its volume when heated in a heater. The increased volume is then discharged through the safety valve into the waste. This leads to water losses. Larger proportional losses occur especially when hot water is not taken during heating.

Protection against contamination of drinking water by return flow

7.5.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Danger of backflow is underestimated. Water mains operators rely on a reversing valve in a water meter assembly, but this may not be reliable. Here, health risks and deterioration of drinking water quality in backwaters are known.

Solar water heating on the Czech market

30.4.2018 | Bc. Jakub Venzara, ČVUT v Praze, Fakulta strojní, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The authors describe the economic and technical connections related to the use of thermal solar water heating systems on the Czech market. This includes investment costs, grant titles, operating options, and an estimated lifetime that is roughly twice as high as the economic return.
7 comments, last 03.05.2018 10:31

Framework of the National Environment Program for the period 2018 & 2020

9.4.2018 | Státní fond životního prostředí
This Framework of the National Environment Program is the extension of the National Environment Program document. The Framework introduces priority themes to be supported by the National Environment Program over the next three-year period.

Retrofit in terms of measurement and regulation

26.3.2018 | Ing. Jan Vidim
Measuring and control devices as well as other HVAC systems, run through their lifecycle, at the end of which the system needs to be reconstructed. A key condition for a successful retrofit is to determine the required life of the refurbished equipment.

Pump connection at long-distance water transport

19.2.2018 | Ing. Milan Dermek, doc. Ing. Mikuláš Monoši, PhD., Žilinská univerzita v Žiline, Fakulta bezpečnostného inžinierstva, Žilina, Slovensko
The article deals with the issue of water transport by hose lines to fire. It describes pump connections when transporting water according to required parameters at the intervention site. Compares how the hose line is connected and determines the suitability of its use.

How do rainwater absorption systems look like?

19.2.2018 | Ing. Jan Vacek, ASIO, spol. s r.o.
Rainwater can be captured and used directly. After simple mechanical cleaning it is suitable for irrigation or flushing toilet, cleaning, car wash or laundry. The basic choice is the pumping of rainwater. The article describes the possibilities.

Requirements for indirectly heated pressure cylinder water heaters

19.2.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Revised CSN EN 12897 “Water Supply – Indirectly heated pressure (closed) storage water heaters” applies to indirectly heated pressure container heaters up to a volume of 2000 liters usable in internal water conduits at overpressure from 0.05 MPa to 1.0 MPa. The author draws attention to important provisions of the standard that will be reflected in practice.
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Economic assessment of energy saving measures in apartment buildings - HVAC systems

5.2.2018 | Ing. Karel Mrázek
The article deals with the economic assessment of energy saving measures as a further continuation of the topic of reconstruction of HVAC systems in apartment buildings. Selection of economical lifespan for selected elements and functional parts with preventive maintenance costs is provided. Finally, an example of the apartment building evaluation is given.

What requirements have to be met by a family house electrically heated a and what impact should a change in the primary energy conversion factor?

29.1.2018 | prof. Ing. Karel Kabele, CSc., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovtavební, katedra TZB, Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovVUT v Praze, Fakulta stavební, katedra TZB
Family houses with the concept of electric heating by means of an electric boiler or electric direct heating system and the preparation of hot water in an electrically heated tank do not meet the requirement for the energy performance of buildings. The authors analyze the magnitude of the conversion factor and other parameters that would meet ENB requirements.
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