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Archiv článků od 13.1.2020 do 15.3.2021

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15.3.2021
Ing. Stanislav Bíza, SASTA CZ, a.s.

The subject of the complex repair of the ceiling structure of the water reservoir Pasohlávky was the remediation and static provision of the unsatisfactory reinforced concrete structure. The original condition was inadequate, parts of the concrete structure were dropped due to steel due to steel corrosion and small cover layers of concrete.

22.2.2021
Ing. Aleš Jakubík, Ing. Radek Hermann

Example of rehabilitation of sewerage facilities, shafts and chambers in an environment of the historic city center with increased loads of chemical-biogenic corrosion. Possible causes and consequences for both, original and newly constructed, building structures. Modification of the proposed solution, including the design of an appropriate construction structure and installation technology solution.

25.1.2021
Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně

Internal sewers can be a source of odors in a building. The penetration of odorous gases into the interior is prevented by suitably designed ventilation of sewers and installation of odor traps (slang called siphons). The article summarizes the causes of odor penetration and the principles of sewer ventilation design.

28.12.2020
Ing. Viacheslav Shemelin, doc. Ing. Tomáš Matuška, Ph.D., Časopis Vytápění, větrání, instalace

The design of a solar system for the preparation of hot water in an apartment building is analyzed by computer simulation. The analysis shows the effects of the design of the area of solar collectors, climatic conditions, the connection of the circulation circuit and the design of the volume of the solar storage tank on the solar coverage and specific heat gains.

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30.11.2020
prof. Ing. Rudolf Hela, CSc., Ing. Milan Ťažký, Ph.D., doc. Ing. Lenka Bodnárová, Ph.D.

Many structural concrete elements of dams must withstand extreme frost stress and abrasion of fast-flowing water. At present, several reconstructions of concrete overflows, chutes of dams or weirs are underway or have already taken place with the requirement for increased resistance to abrasion. From the point of view of ČSN EN 206, abrasion-resistant concretes are determined by exposure class XM, but the evaluation criteria and testing methods are insufficient. The article deals with a closer presentation of the requirements for the properties and development of concrete with high resistance to abrasion and frost and its subsequent testing.

11.11.2020
Ing. Josef Hodboď, TZB-info, redakce

The cause of the odor after the generational replacement of the gas boiler can be reduced air exchange in the room, improperly designed waste pipes, or even insufficient hygiene. The level of cleaning and hygiene is solved by the apartment user. Sufficient ventilation and treatment of the waste pipe, such as the installation of an aeration valve, should be designed by a person skilled in the art.

9.11.2020
Ing. Jan Vidim

Today, technical support is an essential part of services related to the sale of products, heating technologies, including other parts of the HVAC area. It has a pre-sale, sales and post-sale form. For those who need to use support, they are intended in the article of the said advice. At the same time, however, companies that introduce support can learn or inspire changes that have already been implemented.

5.10.2020
Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Fakulta stavební, Katedra technických zařízení budov

In connection with the entry into force of Decree No. 264/2020 Coll., On the energy performance of buildings, the method of assessing the energy performance of new buildings is changing. The article on the case study of a family house presents an approach to the concept of technical systems of new family houses from the point of view of current and future requirements (from 1. 1. 2022) for the energy performance of buildings.

28.9.2020
Ing. Miroslava Pumprlová Němcová, Ing. Michal Kriška, Ph.D.

In the Czech Republic, the constructed wetlands (CWs) have been used as wastewater treatment technologies since 1989. They are usually designed for small communities to 500 PE exceptionally to 2 000 PE. At present, about 300 CWs are in operation in the Czech Republic. Majority of them are designed with horizontal subsurface flow, while vertical subsurface flow (VF) constructed wetlands are still rarely used. Compared to abroad, vertical filters (beds) in the Czech Republic are only a new technology. Proof of this are the results from the largest vertical filter operated at CW Dražovice for 850 PE. The technology of vertical filter has great potential to improve the reputation of constructed treatment wetlands in the Czech Republic.

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13.7.2020
Ing. Josef Hodboď, TZB-info, redakce

Investment and operating costs and the actual life of the internal water supply system are significantly reflected in the actual economy of the building and its operation. The mistakes that are associated with internal water mains impoverish us all unnecessarily, they only generate work for a small group. It is necessary to change the view of the importance of internal water supply, especially when it comes to buildings managed by the state, municipalities or serving the public.

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6.7.2020
Ing. Josef Hodboď, TZB-info, redakce

Investment and operating costs and the actual life of the internal water supply system are significantly reflected in the actual economy of the building and its operation. The mistakes that are associated with internal water mains impoverish us all unnecessarily, they only generate work for a small group. It is necessary to change the view of the importance of internal water supply, especially when it comes to buildings managed by the state, municipalities or serving the public.

16.6.2020
Ing. Radek Červín, doc. Ing. Tomáš Matuška, Ph.D.

The subject of the research is a ventilation unit with a heat pump providing vacuum ventilation in a specific family house. The year-round energy balance of the operation was prepared from the obtained parameters. For a total heat loss of 5 kW, the seasonal heating factor SPF of the entire system was evaluated at the level of 2.5.

15.5.2020
Ing. Jana Majerová, prof. Ing. Rostislav Drochytka, CSc., MBA, dr.h.c.

For pipe renovation using the CIPP method, the installer company should also define the maximum proportional gas volume of any entrained air and/or evolved gas in the wall of the CIPP tube. There is no prescribed method fordetermining the maximum proportional gas volume in the wall of the CIPP. The maximum proportional volume of any entrained air and/or evolved gas in the wall of the CIPP tube was determined by evaluating pictures from a digital optical microscope and X-ray tomography. For comparison, various methods of curing have been researched (steam curing and the UV-curing). The usage of digital optical microscope is more economically and affordable, but not as exact as X-ray tomography. Greater gas volume in the pipe wall occurs in steam-cured pipes and the pores are enclosed in the pipe wall. In the case of UV-cured specimens there are also open pores on the pipe surface.

27.4.2020
Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně

Saving drinking and hot water without considering the context can jeopardize the hygienic parameters of the water and the function of the internal sewerage system. However, the investigation is necessary, and therefore the author states the risks and defines the limit beyond which the investigation is inappropriate without other measures.

6.4.2020
Ing. Jaroslav Slavíček, VAG s.r.o.

Underground and above-ground hydrants have a special position within shut-off valves. They are used for various functions in water networks. Their importance in relation to the applicable standards is also reflected in the fact that they have a higher minimum service life in the number of cycles (1000 cycles) than conventional shut-off valves with manual control. At present, the usual criterion for their purchase is the price, the criteria of construction and useful elements in terms of long-term durability and reliability are not taken into account.

30.3.2020
Ing. Robert Šafář, Ing. Roman Palatin

One of the current strategies of the joint stock company Brněnské vodárny is the introduction of remote reading technology, which will fully incorporate cooperation with the city. A common approach to the development of the remote reading system is thus fulfilling a vision called Smart City. In this case, with the aim of covering all supply points in the city of Brno by remote reading of water consumption.

29.1.2020
Mgr. Vít Kodeš, Ph.D., Český hydrometeorologický ústav

We present results of monitoring the occurrence of mixtures of unoriginal substances in groundwater of the Czech Republic. The results show that the introduction of new technologies for the removal of organic micro-pollutants will be necessary especially in the case of waterworks, where groundwater is a source for drinking water treatment.

20.1.2020
Mgr. Petr Nakládal, Mgr. Viktor Goliáš, Ph.D., RNDr. Martin Procházka

Methods and instrumentation for injection quality measurement in heat pump boreholes including measurement of groundwater flow through the borehole outside the partly grouted borehole exchanger tubes have been developed in the Czech Republic. A Semtex charge has been developed for the rock massive repair, which reliably disconnects the ground exchanger tubes without serious impacts on the surrounding rock environment and buildings. The resulting hole can then be used for re-grouting, thus preventing undesirable vertical water flow through the borehole.

13.1.2020
Ing. Jan Cihlář, Ing. Rostislav Kasal, Ph.D., Ing. Blanka Anderlová, Ing. Štěpán Zrostlík, Ing. Jan Plechatý

The aim of the paper is to present the possibilities of using water supply systems to mitigate the impacts of drought on the population. The paper includes a description of several specific cases in selected regions. The regions are Hradec Králové and Náchod areas, Central Bohemian Region and the closely related water supply to the city of Prague.


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