Nejnavštěvovanější odborný portál pro stavebnictví a technická zařízení budov

Archiv článků od 14.7.2018 do 21.1.2019

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Energy Flexible Building

21.1.2019 | doc. Ing. Milan Ostrý, Ph.D., VUT FAST Brno
Paper deals with the definition of energy flexible building, its impact on the stability of the grid with the planned increasing share of energy from renewable sources and the possibility of using the heat storage capacity of building structures. Paper further analyzes the selected methodology for evaluation of the energy flexibible building and gives an example of thermally activated building structures.

Physical activity and inner environment´s quality

14.1.2019 | Bc. Tomáš Kops
If we want to maintain air quality in buildings, which is represented by carbon dioxide concentration, it is necessary to know the production of this gas by humans in different conditions. The baseline for mild activity is known, and as it varies with physical activity, it can be determined by spirometric measurements. The article describes how to measure breathing activity and shows interesting results of carbon dioxide production on respiratory and heart rate. These dependencies make it possible to illustrate the need to adjust the air vents for ventilation with respect to the activity that man performs in the space. The article also highlights the technical possibilities to implement the air quality control in the space served by the air-conditioning system.
I recommend this article for publishing.

Air cleanliness on operating rooms during various operation conditions

18.12.2018 | Bc. Barbora Stojanová
The article presents the methodology of validation of the urological operating room for the number of solid particles. The author presents a methodology for assessing the classification of the space in the patient's operating field and in its surroundings. Classification is carried out according to ČSN EN ISO 14644-1 for different times during operation. This is a very topical issue, as the development of new technologies is going forward, the acquisition of optical particle counters is becoming more and more accessible and it is a matter of time when these devices will be a standard part of the permanent measurement of the operating theater's internal space.

Sorption Properties of Building Structures and Their Impact in Indoor Environment

6.12.2018 | Ing. Jakub Diviš, Fakulta stavební, ČVUT Praha, Ing. Jan Růžička, Ph.D., Fakulta stavební, ČVUT Praha, pracoviště UCEEB
The paper summarizes latest research on the influence of natural clay materials and earth structures on the quality of indoor microclimate regarding relative humidity. This laboratory research has been carried out at FCE CTU in Prague and UCEEB CTU in Prague and focuses on the dynamic sorption properties of building structures based on natural clays compared to building structures based on common building materials.
2 comments, last 10.12.2018 10:12

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.

10th Annual Conference IBPSA – Simulation of Buildings and Environmental Techniques

29.11.2018 | Ing. Josef Hodboď, TZB-info, obor Vytápění
Virtual models of spaces, devices, humans, and their interconnectedness with mathematical descriptions of the interactions between them allow for shorter time in finding the optimal variation. Many processes are neither realistically traceable at the micro level, and can be derived only on the basis of the consistency of simulations and real measurements at the macro level. The TZB area offers a wide range of computer simulations, as lectures at the conference.

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.

Personalized ventilation

21.11.2018 | Ing. Miroslava Kmecová, doc. Ing. Michal Krajčík, Ph.D., Stavebná fakulta STU v Bratislave, Katedra technických zariadení budov, doc. Ing. Ondřej Šikula, Ph.D., VUT v Brně, Fakulta stavební, Ústav technických zařízení budov
Personalized ventilation is one of the options to address individual requirements for the supply of fresh air to various workplaces. In particular, desk administration for the use of personalized ventilation creates good assumptions. Applying this method of ventilation is not common, it is the subject of research and the search for optimal solutions. However, as the article shows, it has a number of advantages.

Big or small control system? Difference in Approaches

20.11.2018 | Ing. Jan Vidim, Domat Control System s.r.o.
The "size" of the control system has a significant impact on how individual actors in the supply chain - investor, designer, salesman and implementation technician or programmer - are approaching it. But how do you determine the size - and how do you define it at all? In terms of measurement and regulation, we can highlight two main factors: range and complexity.

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.

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

OC Fenix – overview of the energy consumption of the first year of the building operation for 07-2016 / 06-2017

15.10.2018 | Ing. Miroslav Urban, Ph.D., Ing. Michal Bejček, Ing. Marek Maška, Ing. Petr Wolf, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The article contains a summary of energy consumption, a comparison with the calculation assumptions in a particular administrative building. The object is designed with minimal energy consumption and the goal is to achieve the highest degree of energy independence using photovoltaics and battery storage. The actual course of measured energy consumption, the overall assessment for the past period, the monthly summaries for the building as a whole and the individual sub-measured energy consumption are given. The aim is to bring the issue to the professional public and to indicate the path to the solution.
3 comments, last 18.10.2018 10:31

R718 - water as refrigerant

15.10.2018 | Efficient Energy GmbH
Chiller operators are currently facing enormous challenges. In 2018, the next phase of the F-Gas Regulation is implemented across the EU. HFKW-type refrigerant prices have risen sharply and are a critical flaw, and safety requirements have been tightened on operators.

Polytropic steam dampening

9.10.2018 | doc. Ing. Aleš Rubina, Ph.D, Vysoké učení technické v Brně, Fakulta stavební, Ústav technických zařízení budov, Ing. Olga Rubinová, Ph.D., Vysoké učení technické v Brně. Fakulta stavební, Ústav technických zařízení budov
Steam dampening and air heaters are the most common air conditioning in the winter. Steam dampening has its hygienic advantages but also technical drawbacks.
1 comment, 09.10.2018 22:46

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.
Výsledky měření koncentrace CO<sub>2</sub> v&nbsp;ložnici při přirozeném větrání oknem

Results of carbon dioxide concentration measurement in the bedroom

10.9.2018 | Ing. Petr Bohuslávek, redakce
The measurement of carbon dioxide concentration was made in my bedroom in February 2018 within one week. CO2 concentration during the night is evaluated under different ventilation modes. The results show a significant effect of ventilation on air quality. They prove that only natural ventilation through tight windows in current developmental residential buildings is inadequate.
6 comments, last 15.01.2019 16:39

Satisfaction assessment of residents of passive housing for senior citizens

27.8.2018 | prof. Ing. Josef Chybík, CSc., VUT Brno, Fakulta architektury
In residential buildings, the quality of the indoor environment can be verified by the satisfaction rates of the people who live in them. One of the forms that can provide the necessary information is a subjective assessment. This form of survey was carried out with residents of the passive apartment building for seniors in Modřice. There were 25 women and 12 men of an average age of 77 years participating in the survey. The survey proved that seniors were able and willing to accept the terms of passive houses.
1 comment, 27.08.2018 14:07

Innovative methods for serial energy retrofitting of residetinal buidlings – examples from the Netherlands

20.8.2018 | Ing. Antonín Lupíšek, Ph.D., ČVUT v Praze, pracoviště UCEEB
The paper describes actual trends in serial deep energy retrofitting of buildings in the Netherlands. A set of photographs presents several Dutch pilot projects of energy retrofitting of post-war family houses in Heerlen, Melick and Soersterberg to net zero energy level and of one multifamily residential building in Arnhem to nearly zero energy level. The retrofitting projects were made utilizing prefabricated thermal insulation wall modules with timber structural system (that included new windows) and prefabricated roof panels. All presented projects also featured replacement of energy sources and in case of the family houses also installations of photovoltaic systems replacing roof tiles.

Analysis of Solar Air Collector Solutions for Heating of Single Family House

16.7.2018 | Ing. Viacheslav Shemelin, Energetické systémy budov, UCEEB, ČVUT, Buštěhrad, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Solar air collectors can provide partial coverage of the heat demand for building heating. On the energy model of a family house, an annual heat supply for heating for different uses of air collector systems was examined. The analysis shows that, as opposed to the use of a ventilating unit with recuperation, the air solar collectors do not provide savings due to low solar gains and short operating hours in the winter. The combination of the air collectors with the regenerative unit does not bring a significant decrease in the energy requirement compared with the regenerative unit itself, as the combined efficiency of both devices is reduced.

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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