Nejnavštěvovanější odborný portál pro stavebnictví a technická zařízení budov

Archiv článků od 22.1.2018 do 3.10.2018

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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.
1 comment, 05.10.2018 08:33

Real smart grid: electric vehicle charger with PVE and battery helps to stabilize the grid

18.9.2018 | Věra Kubátová, skupina Energon
Unique charging station for electric vehicles was opened in february at the Prague Fair Grounds. The project combines recharging of electric vehicles with other functions: by producing their own energy using roof photovoltaics and by regulating overvoltage or undervoltage of the surrounding network using a battery system.
3 comments, last 02.10.2018 16:00

Biogas made from feed sorrel

27.8.2018 | Ing. Vlasta Petříková, DrSc., České sdružení pro biomasu – CZ Biom
There is not sufficient material for agricultural biogas stations from their own activities (organic fertilizers, etc.), so it is complemented by targeted crops. In general, corn is used, but can be replaced by a feed sorrel. It has many benefits, such as lower cropping costs and long-term endurance, thus limiting soil erosion.
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Current development of building integrated photovoltaic systems in façades

20.8.2018 | Ing. Jakub Čurpek, Centrum AdMaS, Fakulta stavební, Vysoké učení technické v Brně
Innovative technologies incorporated in building constructions are able to produce renewable energy. The submitted paper deals with the current status of photovoltaic (PV) integration in building facades by selected systems. The main emphasis is focused on the newest concepts and their current development, specifically of those in combination with other progressive materials and technologies.
1 comment, 21.08.2018 07:36
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Defining the boundaries of own lands in the territory of the region as a basis for updating the principles of territorial development

6.8.2018 | Ing. arch. Simona Vondráčková, ČVUT v Praze, Fakulta stavební, katedra urbanismu a územního plánování, doc. Ing. arch. Ivan Vorel, CSc., doc. ThLic. Ing. arch. Jiří Kupka, Ph.D., Fakulta životního prostředí ČZU v Praze, katedra biotechnických úprav krajiny
Replacing a concept “types” of the landscape by the concept “landscapes” in the content of the graphical part of the territorial development principles (ZÚR) presents a substantial change of content in the expression of conception of the regional development, because for these landscapes the target qualities including territorial conditions for their preservation or accomplishment are established in the territorial development principles (ZÚR). The original definition of the types of landscape, which divided the territory according to the characteristic features and properties, must be gradually replaced by the definition of (real) landscapes. It is a great change, because a type of landscape expresses the characteristic properties, but real landscapes in the sense of landscape itself = specific, characteristic, have substantially different sense – they express most of all individual properties of the landscape. Therefore it is necessary to describe and give reasons for importance and the method of individual (not typological) zonation of the territory of the region into landscapes (real landscapes) corresponding to the sense of the European Landscape Convention.
EPD Liptovská Kokava

Straw in contemporary architecture

6.8.2018 | Ing. arch. Miroslav Ščudla, Ph.D., ČVUT v Praze, Fakulta architektury, Ústav navrhování II.
In contemporary architecture, straw is used marginally, mostly in do-it-yourself construction. Although the convenient qualities of straw have long been known, it has not gained the trust of builders and designers. Construction companies have not learned to work with straw on a regular basis. In the scope of green technologies, an opportunity is emerging to use straw in professional building systems suitable for sustainable architecture. If we want to apply it in our architectural designs, we have several possibilities. The common small straw bales are suitable for many ways of structure and do-it-yourself process. This way of building process can be interrupt by logistic problems or weather disaster. Contemporary building market offers professional products made of straw: universal strongly pressed boards or system of modular units for external walls. All these ways of application are able to gain the high building quality. The innovative straw technologies enable to design and erect the energy passive house with considerable percentage of straw in constructions. Although the advantages of straw are indisputable, the next success of straw building materials depends on the interest of architects and builders.

Photovoltaic powerplant fire

16.7.2018 | kpt. Ing. Filip Nos
The issue of fires of photovoltaic power plants attracted great media attention around 2010. In terms of the total number of installations of photovoltaic power plants and the amount of electricity produced, the Czech Republic is equal to solar giants such as Germany, Italy, France. However, if we look at a comparison of photovoltaic capacities related to the population, position of the Czech Republic is not bad in the EU.

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.

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.

Field crops for energy use

4.6.2018 | Ing. Vlasta Petříková, DrSc., CZ Biom – České sdružení pro biomasu
Biomass energy utilization is usually considered as direct combustion, newly for the biogas production in the biogas plant (BPS). In addition to commonly known tree species, the field crops described in this paper can be used as well.

Operational efficiency of automatic biomass boilers

14.5.2018 | Ing. Jakub Maščuch, Ph.D., Ing. Petr Mydlil, Univerzitní centrum energeticky efektivních budov ČVUT v Praze
When deciding on energy investments, consultants and designers often rely on data listed in the technical data sheets provided by manufacturers. This can lead to a very unpleasant surprise for operators - fuel consumption is often significantly higher than assumed by the assessment. Especially in terms of smaller heat sources, this approach leads to errors and consequent significant economic losses.

Environmental benefits of using recycled wood to produce agglomerated materials (Part 1)

7.5.2018 | doc. Ing. Milan Gaff, Ph.D., Ing. Kamil Trgala, Ph.D., Ing. Tereza Adamová, Česká zemědělská univerzita v Praze, Fakulta lesnická a dřevařská
Wood and the materials on its basis fulfil the requirements of an ever-evolving and accelerating society. In addition to naturally grown wood, wood-based materials are frequently used as a basic material for production of furniture and for building constructions as well. Looking at changes in waste management, a significant shift from the waste to the circular economy can be observed. The valuable raw materials are kept in the production cycle instead of landfilling or burning. Wood and wooden products can be efficiently separated in waste management, reused and recycled. The so-called wood waste – old furniture, wooden pallets, window and door frames, demolition wood, used lumber, bark and other wood residues can be reused in particleboard production. Particle board manufacturers in the Czech Republic have adopted progressive waste management and currently use 60% of recycled wood into particle boards. A completed life cycle analysis (LCA) of OSB demonstrates that replacing of 50% of natural fibres with recycled wood has significant environmental benefits. The objective is to push furthermore on effective legislation to promote waste material utilization and thus lead to a more sophisticated waste wood collecting.

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

CO2 emissions and their impact on the assessment of sources in buildings

19.3.2018 | Ing. Jiří Novotný, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
One of the most well-known and most important greenhouse gases is carbon dioxide (CO2), which arises from natural processes, but the burning of carbonaceous fuels, especially fossil fuels, contributes significantly in the last century. This text focuses on CO2 emissions associated with energy transformations for the supply of energy to buildings.
4 comments, last 18.06.2018 14:08

Wind power – uncommon and rediscovered ways and dead ends

12.3.2018 | Břetislav Koč
Attempts to using wind power lead in the past to many technical discoveries and solutions. In this article we are going to look at the less common, functional and unfunctional ways and at the funny ones as well.

Energy management as a part of facility management in E.ON CZECH

5.3.2018 | Ing. Michal Prak, E.ON Česká republika, s.r.o., Doc. Ing. Alena Tichá, PhD., Ústav stavební ekonomiky a řízení FAST-VUT
Energy management is a generally used term under which many sub-activities are hidden. These activities should lead to an efficient energy management system and to reduce the production of greenhouse gas emissions. The energy management system is a continuous process that, when properly adjusted, leads to savings in the funds spent on consumed energy. The energy management system can be included in the Facility Management portfolio and preferably in the Property Management department.

Auctions – A new system of support for renewable energy sources in the Czech Republic

26.2.2018 | Mgr. Luděk Šikola, Doucha Šikola advokáti s.r.o.
The European Union is changing its RES support system. From the 1st January 2017, aid granted by the Member States should be in the form of tender procedures as required by the State Aid Guidelines for the Environment and Energy 2014-2020.
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Requirements for new heat sources and boiler rooms in the Czech Republic according to Act No. 406/2000 Coll.

29.1.2018 | Ing. Karel Mrázek
Eco-design is a set of parameters (especially energy efficiency) that must be observed by the supplier (the manufacturer or importer) of the energy-related product when it is placed on the EU market or into operation. The article provides an overview of requirements for new sources and boiler rooms in relation to implemented regulations.
1 comment, 29.01.2018 07:33

Phase measurement represents a problem for small prosumers. How to prevent it?

29.1.2018 | Ing. Jaroslav Šuvarský, S-POWER s.r.o.
Phase measurement complicates using of solar energy to small prosumers and companies. A solar power plant can save a large part of the electricity expenses, but the system needs to be carefully planned.
36 comments, last 03.03.2018 00:10

Wave – development and experimantal operation of small biomass cogeneration plant

22.1.2018 | Ing. Václav Vodička, Ing. Zbyněk Zelený, Ing. Jakub Maščuch, Ph.D., Univerzitní centrum energeticky efektivních budov ČVUT v Praze
The paper presents a summary of achieved parameters of Wave – a cogeneration plant that received the E.ON Globe Energy Award in a category “Idea” in 2015. Operation experience and modifications of WAVE from the ceremonial baptism in 2016 to the end of November 2017 are described.
1 comment, 27.01.2018 12:54
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