Nejnavštěvovanější odborný portál pro stavebnictví a technická zařízení budov

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Influence of heat loss of the pipeline on the energy balance of the solar system

17.12.2018 | doc. Ing. Petr Horák, Ph.D., Ing. Karolína Vyhlídalová, VUT v Brně, Fakulta stavební, Ústav technických zařízení budov
The paper deals with the analysis of thermal losses of pipe distributions in the small solar system model created in the TRNSYS energy simulation tool. Attention is paid to the impact of heat loss through pipelines on the overall energy balance. Several variants of pipe lengths for one type of system have been selected. The results presented in the articles illustrate the influence of different pipe lengths on heat losses and the consequent impact on the energy balance of the monitored system.
2 comments, last 19.12.2018 18:28
Ilustrační obrázek, zdroj článek TZB-info Legionella v České republice, Euroclean

Legionella - By applying preventive measures, a safe system can be achieved

10.12.2018 | prof. Ing. Zuzana Vranayová, PhD., Stavebná fakulta TUKE Košice
By applying preventive measures and using risk management, we can achieve a secure system and eliminate costly solutions. The order of danger of infection sources is very difficult to determine unambiguously.

SBToolCZ green building assessment methodology for school buildings

4.12.2018 | Ing. Jan Tripes, TZÚS Praha, s. p., pobočka České Budějovice
The article describes basic principles of the SBToolCZ green building assessment methodology stressing its up-to-date methods for school buildings. An example of a certified school is given. Renovation of this school was assessed and optimised by the SBToolCZ system which lead to the conversion into intelligent, zero energy building.

Two-year operation of the Fenix office building in Jeseník – a view of the energy balance

26.11.2018 | Ing. Petr Wolf, Ph.D., Ing. Sofiane Kichou, Ing. Marek Maška, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
In July 2018, a two-year monitoring of the FENIX Group a.s. in Jeseník. During this time, different battery operating modes were applied to test their capabilities to ensure the power operation of the object. This article describes the entire period in terms of energy flows in the building. The key parameters are energy consumption, supply to the grid, self-sufficiency of the building from the photovoltaic source and its local use. A number of articles have been written about the building, detailing the building and energy aspects [1, 2]. Therefore, the description of the energy economy in the building will be given only to the extent necessary for a general view of the building's energy.

Issues of Issues of Energy-Neutral Buildings – Part 2: An Example of a Family House

12.11.2018 | Ing. Jiří Novotný, na Univerzitní centrum energeticky efektivních budov, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The methodology for determining energy-neutral or energy-zero houses is different at national levels. The interest in the realization of such houses is not only influenced by the methodology but also by the market conditions in the area of moving surplus energy production from one object to another. This is an economically disadvantageous purchase price when delivering to the network. If the existing conditions in the Czech Republic are not changed, the implementation of energy-zero houses for investors will not be interesting and the potential for reduction of CO2 production will not be utilized.

Rainwater Management at the Water Count Conference in Prague

10.11.2018 | doc. Dr. Ing. Ivana Kabelková
Where is the biggest obstacle to implementing rainwater management? What is the right motivation? What is the effect of the exemption from the drainage water drainage payment? What are the experiences with plants on building façades? And what are the investment and operating costs of a green roof?

Issues of Issues of Energy-Neutral Buildings – Part 1: Evaluation and Calculation

5.11.2018 | Ing. Jiří Novotný, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The methodology for determining energy-neutral or energy-zero houses is different at national levels. The interest in the realization of such houses is not only influenced by the methodology but also by the market conditions in the area of moving surplus energy production from one object to another. This is an economically disadvantageous purchase price when delivering to the network. If the existing conditions in the Czech Republic are not changed, the implementation of energy-zero houses for investors will not be interesting and the potential for reduction of CO2 production will not be utilized.
2 comments, last 25.11.2018 14:09

Near zero energy buildings realization in the Czech Republic

8.10.2018 | Ing. Jan Antonín, Ph.D., Ing. Zdena Dobrá, EnergySim s.r.o.
The notion of a nearly zero building, usually NZEB or nZEB, is no longer a novelty. This energy standard was introduced in 2016 and is gradually expanding into family houses. There are legislation, standards, but little has been gained. That's why the authors analyzed 130 already existing family houses with different heat sources. The result is an assessment of the influence of different heat sources on the energy intensity of homes and therefore an orientation aid for decision-makers of future builders.

Optimalization of storage tank design for PV systems

3.10.2018 | Ing. Jan Stašek, DEKPROJEKT s.r.o.
The article focuses in detail on the effect of the storage tank size on the yearly balance of the photovoltaic power plant using a 10-minute calculation step that will allow us to take a closer look at the processes associated with the production of electricity, the hot water consumption and its accumulation. The results are assessed not only from the point of view of the energy balance, but also from the point of view of economic advantage.
2 comments, last 26.10.2018 13:50

Is it possible to drain condensate from the condensing boiler through the toilet flush tank?

1.10.2018 | Ing. Josef Hodboď, TZB-info, obor Vytápění, Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
By replacing the non-condensing gas boiler with condensing is connected with the necessity to solve the condensate drain from the boiler into the sewer. For boilers, especially in households, it may be as simple as introducing condensate into the flushing cistern of the WC. The article discusses operational and hygienic contexts. The conclusion is that without the additional installation of a special fitting – the pipe separator into the drinking water supply to the cistern, it is a solution that is inconsistent with current regulations and cannot be recommended.
3 comments, last 04.10.2018 07:32

The Most Common Mistakes when Designing a Hot Water Storage Tank

24.9.2018 | Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Časopis Vytápění, větrání, instalace
The aim of the paper is to highlight the most common mistakes in sizing of domestic hot water (hereinafter only DHW) storage tanks and heat sources for DHW preparation. The article describes two basic ways of designing: Method using heat supply and demand curves of the DHW preparation system and Method of priority DHW preparation. Sizing of the DHW storage tank should primarily correspond to the used heat source and expected hot water consumption profile. When using the heat supply and demand curve method, the designer places the greatest importance on the minimum size of the DHW storage tank (i.e. the shape of the supply curve), regardless of the potential changes in the DHW consumption profile (i.e. the demand curve). When using the so-called priority DHW preparation, the basic precondition is often neglected that the required heat output of a common heat source must comply not only with the DHW preparation system but also with other connected heat consumption points.

Design of sewage pipelines

17.9.2018 | doc. Ing. Jana Peráčková, PhD., Stavebná fakulta, STU Bratislava
This design and technical solutions for sewage effluent are recommended based on the requirements of EN 12056-2 and experimental hydraulic pipeline measurements. Individual adjustments for pipe breakage are contained in national standards, e.g. STN 73 6760, ČSN 75 6760 and DIN 1986-100, which must comply with EN 12056-2.
Ilustrační obrázek, foto autor

Design and installation of internal drainage pipes

3.9.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
The principles are set out in CSN 75 6760. Priority is given to sufficient drainage of waste water from equipment without extraction of odor closures and backflow.

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

27.8.2018 | Ing. Jaroslav Dufka
The security elements and their connection vary depending on the type of heater and the amount of heated water. The connection of the safety valve pipe to the drainage system must be ensured by a so-called free spout in accordance with ČSN EN 1717.

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

20.8.2018 | Ing. Jaroslav Dufka
For instantaneous heating, heated water is immediately consumed. Accumulating water heating is obtained especially when there is insufficient heat source available. For district heating, the water is heated outside the object in the heat exchanger station. For multi-stage heating, the water is heated by several heat sources.
© silver-john - Fotolia.com

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.
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