Archiv článků od 5.12.2016 do 19.6.2017

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Power Prediction of Photovoltaic Systems

19.6.2017 | Ing. Petr Wolf, Ph.D., ČVUT UCEEB
This article focuses on the topic of power prediction for photovoltaic systems. It presents parameters which have major impact on operation performance of such systems. Main types of weather predictions for photovoltaic systems are being described together with their usage and sources for input data.

Law and experts: Destruction of a solar thermal collector

29.5.2017 | Ing. Jiří Matějček, CSc.
The expert analysis reveals the cause of the mechanical failure of the solar collector as a result of non-adjustment of the control valves control to the operating states of the system. Simultaneous adjustment of the control valves eliminated the safety device from the function, when the pressure increased excessively and the collector leaked.

Solar collectors and heat pumps - what are their testing and parameters good for?

22.5.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The parameters and characteristics obtained from the laboratory test are used to compare products in terms of performance and efficiency. The results also serve for the correct design and evaluation of the year-round behavior of the element built into the entire thermal system.

Working with stakeholders of urban construction projects: inform, listen and plan together

8.5.2017 | Mgr. Martina Bacúrová, Mrg. Tomáš Vácha, Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
The article describe the communication and cooperation of urban projects stakeholders. Inadequate communication can raise conflicts which could obstruct project realization.

Environmental assessment of a detached family house Part 2

3.4.2017 | Bc. Richard Paksi, Ing. Karel Struhala, Vysoké učení technické v Brně, Fakulta stavební
This two-part paper deals with the topic of environmental effectiveness of buildings. The goal of the paper is evaluation of expected embodied environmental impacts related with a detached family house. First part of the paper describes the evaluated building and used methods. Seven currently common variants of load-bearing structures (walls and floors) are described and compared. Five variants include masonry, while the sixth and seventh variant includes cast-in-place reinforced concrete structures. The evaluation follows Life-Cycle Assessment (LCA) methodology according to ČSN EN 15978 standard. The results of the evaluation are shown in the second part of the paper. Under the specified boundary conditions the variant with ceramic masonry filled with mineral wool has 5–14 % lower environmental impacts than other evaluated variants.

Environmental assessment of a detached family house

27.3.2017 | Bc. Richard Paksi, Ing. Karel Struhala, Vysoké učení technické v Brně, Fakulta stavební
This two-part paper deals with the topic of environmental effectiveness of buildings. The goal of the paper is evaluation of expected embodied environmental impacts related with a detached family house. First part of the paper describes the evaluated building and used methods. Seven currently common variants of load-bearing structures (walls and floors) are described and compared. Five variants include masonry, while the sixth and seventh variant includes cast-in-place reinforced concrete structures. The evaluation follows Life-Cycle Assessment (LCA) methodology according to ČSN EN 15978 standard. The results of the evaluation are shown in the second part of the paper. Under the specified boundary conditions the variant with ceramic masonry filled with mineral wool has 5–14 % lower environmental impacts than other evaluated variants.

The invention, patent or utility model - who should sort?

8.3.2017 | Ing. Zdeněk Lyčka
The article explains the differences between the invention patents and utility model from the perspective of Czech legislation. Also highlights the confusion individual categories and purposeful fraud by producers and sellers of equipment.
1 comment, 08.03.2017 07:44

Summary Evaluation of fuel and energy consumption in Czech households by 2015

6.3.2017 | Ing. Vladimír Stupavský, redakce
Czech Statistical Office published in the February 2017 data from a large sample survey in Czech households with an Energy 2015. This survey was focused mainly on the consumption structure and methods of use of particular fuels and energy. The data focus on historical comparisons and consumption trends from 1991 to 2015. The statistics include methods of thermal insulation of housing, fuel used for heating and hot water, the average consumption of Czech households, types of heating sources, etc.
2 comments, last 11.04.2017 14:25

Primary energy savings and CO2 savings by using biomass microCHP plant

20.2.2017 | Ing. Jakub Maščuch, Ph.D., Ing. Petr Mydlil, ČVUT UCEEB
Paper describes selected effects of implementation of biomass microCHP generation in Czech legal conditions. Selected demonstration of biomass CHP is described and basic operational energy balances are presented. Comparison of microCHP and ordinary biomass boiler energy balance were performed. MicroCHP technology WAVE, which is being developed at CTU UCEEB in Buštěhrad, is described. Operational parameters of WAVE and future development outline were discussed.
16 comments, last 27.02.2017 11:18

Thermal energy prices and their development to year 2016

9.2.2017 | Ing. Josef Hodboď, redakce
ERU has compiled the inventory of actual prices of thermal energy for holders of licenses for the production and distribution of thermal energy on 31. 12. 2015 and prior to the year 2016. The office added it to historical data since 2006, so it contains last ten years.
3 comments, last 16.02.2017 15:06

Changes for the second round of grants for the replacement of old boilers

2.2.2017 | Ing. Zdeněk Lyčka
The Ministry of Environment intends to publish the changes for the second round of grants for the replacement of boilers in March 2017. Prefer to be renewables, coal-fired boilers will have less support than before. Until now, the accepted 26,000 applications for grants, money is one-third depleted.
1 comment, 02.02.2017 11:13

Energy Label of Solar Water Heaters

30.1.2017 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov (UCEEB) ČVUT
The article deals in detail with the solar water heater from the EU Commission Regulation 812/2013. It describes what information provides the label and how it originated classification in the relevant energy efficiency class water heating.

Conditions of direct sales of self-produced electricity

23.1.2017 | Mgr. Mikuláš Vargic, Doucha Šikola advokáti s.r.o.
In relation to the decentralized electricity production development, the issue whether it is possible to sell generated electricity directly to users of apartments in residental buildings, offices or other areas without using the distribution grid, is on the agenda.
2 comments, last 10.02.2017 11:42

Offshore wind power

16.1.2017 | Břetislav Koč
The article describes the specifics of offshore wind turbines, their construction, history and development.
6 comments, last 19.01.2017 10:38

Nearly Zero-Energy Buildings

9.1.2017 | Ing. Jan Antonín, Ph.D., EnergySim, Ing. Magdalena Purkrtová
For more than a year, a nearly zero-energy standard has applied to certain buildings. In the Czech environment, specific technical parameters for such buildings have been known for three years. And for over six years, the Directive on energy performance of buildings has been in force, imposing the obligation upon EU member states to introduce this standard.

Nevertheless, it seems that for many experts, including those in the field of energy, this term is still quite unclear. Many imagine buildings coated with photovoltaic modules from the ground to the roof, buildings which are better than passive ones or buildings which are self-sufficient, i.e. completely independent of public energy networks. Given the fact that the concept of a nearly zero energy building is very distant from such notions, and because this standard will soon become obligatory for all buildings, including small family houses, let's have a look at what a nearly zero-energy building really is.
6 comments, last 12.01.2017 14:25

Access to Buildings with Nearly Zero Energy Consumption

2.1.2017 | prof. Ing. Karel Kabele, CSc., Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Fakulta stavební, katedra TZB
The article describes the impact of the contemporary and future legislative requirements for new buildings in terms of their conception and utilization of renewable resources. Soon, the requirement of quality standard is going to be effective in the Czech Republic that is called building with nearly zero energy consumption. That quality standard is defined at national level by legal regulations based on the requirement of European standard. On examples of family house, residential house and administration building, the impact of the to-be-established requirements for building conception is being demonstrated from the construction as well as the technical systems' point of view. With the existing development trend maintained it can be expected that a building with nearly zero energy consumption will have, comparing to an existing building, a better quality building shell, technical systems working with high efficiency and potentially may but needn't be, partially supplied by renewable energy resources.

Reliability of Concrete Tanks for Biogas Plants

26.12.2016 | prof. Ing. Juraj Bilčík, PhD., doc. Ing. Július Šoltész, PhD., Katedra betónových konštrukcií a mostov, Stavebná fakulta STU v Bratislave
For rational design of concrete structures, it is necessary to take into account all types of loads to which the structure is exposed during the execution, operation and reconstruction. Biogas tanks belong to the group of constructions where the indirect and environmental loads represent a high risk to the reliability, particularly in terms of their serviceability and durability. The article analyses the effects of these loads as well as the causes of separation cracks formation.

Labeling solar equipment, solar water heaters and solar kits for hot water

26.12.2016 | doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
This article summarizes the basic concepts of Commission Regulation EU 811/2013 and 812/2013, focusing on solar equipment, solar water heaters and solar packages. Describes the responsibilities of suppliers who place such products on the market.

Invalid control of boilers - how to spot an impostor and how to successfully choose the right inspector

5.12.2016 | Ing. Zdeněk Lyčka
Operators of boilers and heaters, solid fuel for power from 10 to 300 kW, connected to a hot water heating system, left last month in order to secure the obligatory checking its source authorized person (if not already). Perhaps the biggest problem are false inspectors who at the gullible and "ignorant" operators carry out checks without having to be entitled. Thus, the inspections carried out are usually cheaper than controls carried out by an authorized person, but from the perspective of the law are invalid.
1 comment, 05.12.2016 09:27

Smart cities - the cities of the future III.

5.12.2016 | Ing. Michal Lom, doc. Ing. Ondřej Přibyl, Ph.D.
This article is the third in a series of Smart Cities - the cities of the future, which is aimed to provide some concrete solutions and applications of smart cities, that are already being applied in the world and tries to describe their contribution to public administration and urban residents. In this article, we focus on two areas of Smart City - Smart Living and Smart Environment.
1 comment, 05.12.2016 20:11
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