Archiv článků od 6.3.2017 do 4.6.2018

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Smart Metering utilization in energy settlement systems II.

4.6.2018 | Bc. Jiří Vastl
The thesis is focused on smart metering system and ripple control. The first theoretical part describes function of ripple control. The second theoretical part presents smart metering technology with introduction of a new system of energy settlement. The new system of energy settlement use prices in the intraday market which are published on Electric grid operator’s website. The system can be considered as a dynamic tariff. The system of energy settlement is demonstrated on consumption of the family house. The comparison of both systems is demonstrated in the final part of the thesis.
1 comment, 10.06.2018 22:31

Smart Metering utilization in energy settlement systems – part one

28.5.2018 | Bc. Jiří Vastl
The thesis is focused on smart metering system and ripple control. The first theoretical part describes function of ripple control. The second theoretical part presents smart metering technology with introduction of a new system of energy settlement. The new system of energy settlement use prices in the intraday market which are published on Electric grid operator’s website. The system can be considered as a dynamic tariff. The system of energy settlement is demonstrated on consumption of the family house. The comparison of both systems is demonstrated in the final part of the thesis.
4 comments, last 08.06.2018 15:55

Environmental benefits of using recycled wood to produce agglomerated materials (Part 3)

21.5.2018 | doc. Ing. Milan Gaff, Ph.D., Ing. Kamil Trgala, Ph.D., Ing. Tereza Adamová, Česká zemědělská univerzita v Praze (ČZU), Fakulta lesnická a dřevařská, katedra dřevěných výrobků a konstrukcí
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.

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.

Emissions in operation of microgeneration unit with stirring engine and fuel cells

7.5.2018 | Ing. Marek Patsch, PhD., Ing. Peter Ďurčanský, PhD., Žilinská univerzita, Strojnícka fakulta, Katedra energetickej techniky
The use of the Stirling engine and fuel cells in micro-cogeneration units is not yet very extensive, so the facilities of the University of Žilina have been in a long-term test run. This article aims to compare the gaseous emissions produced in the operation of the given micro-cogeneration units compared to conventional micro-CHP units and heat sources and, in particular, to popularize the equipment of such types among the broad professional public.
1 comment, 07.05.2018 07:52

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

Comparison of benzo[a]pyrene emissions from each source category

12.3.2018 | Ing. František Hopan, Ph.D., Ing. Jiří Horák, Ph.D., Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Ing. Milan Dej, Ph.D., Ing. Jiří Ryšavý, Ing. Vendula Laciok, Ph.D., Jiří Kremer, VŠB-TU Ostrava, Výzkumné energetické centrum
The aim of this paper is to compare BaP emissions from domestic heating, industrial emissions of BaP and BaP emissions from transport within the scope of the Czech Republic and individual regions of the Czech Republic using current balance approaches that are used for reporting BaP emissions for the Czech Republic under the Convention on Long-range Transboundary Air Pollution (CLRTAP).
8 comments, last 18.03.2018 12:35

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.
Brilon a.s.

Change of heat supply from a central source to a domestic gas boiler room

19.2.2018 | Ing. Karel Mrázek
In the area of existing thermal energy supply systems, the processes of disconnection of existing heat consumers have been ongoing for a long time. The key point is correctness of the Energy Certificates. The article provides an example of a specific assessment of disconnection from central source heat supplier.
3 comments, last 05.03.2018 15:59

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

Unrenewable primary energy

30.10.2017 | Ing. Jiří Novotný, Ústav techniky prostředí, Fakulta strojní, ČVUT v Praze, doc. Ing. Tomáš Matuška, Ph.D., Univerzitní centrum energeticky efektivních budov, ČVUT v Praze
Assessing energy performance of the building is also done from the point of view of the need for non-renewable primary energy. A common layman probably does not know what this means. At the same time, the need for non-renewable primary energy fundamentally influences the design of energy sources for heating, cooling, hot water preparation, etc. for a particular building. The need for non-renewable primary energy is one of the three main energy performance indicators of a building, and if it is assessed as too large, the building can not be validated.
9 comments, last 08.11.2017 14:31

Analysis of thermodynamic phenomena in pipeline networks – Numerical model of the temperature field in the heat pipe pipeline area – 1. part

9.10.2017 | Ing. Pavel Sláma
Another of several articles dealing with thermal losses evaluation of heating networks is focused on the numerical modeling of the temperature field in the immediate and distant surroundings of the pipe insulation surface. In connection with the difficulty of solving the analytical methods and in particular with the inaccuracy of their results, especially in less typical but not rare operating regimes, a two-dimensional model of the thermal field generated during the operation around the heating pipeline is offered as a suitable path for describing the whole process. The presented numerical model uses the growth of computational capacities in recent years, so that the size of one segment of the calculation grid is 10 x 10mm, which is, for example, to determine the suitability of the location of another pipe network or cable, near the hot-water pipe, the fineness is already sufficient. The resulting numerical model is being prepared, unlike a substantial part of the analytical methods, to calculate the full range of possible operating conditions of the hot-water and climatic conditions on the Earth's surface.

Analysis of thermodynamic phenomena in pipeline networks – Numerical model of the temperature field in the heat pipe pipeline area – 1. part

2.10.2017 | Ing. Pavel Sláma
Another of several articles dealing with thermal losses evaluation of heating networks is focused on the numerical modeling of the temperature field in the immediate and distant surroundings of the pipe insulation surface. In connection with the difficulty of solving the analytical methods and in particular with the inaccuracy of their results, especially in less typical but not rare operating regimes, a two-dimensional model of the thermal field generated during the operation around the heating pipeline is offered as a suitable path for describing the whole process. The presented numerical model uses the growth of computational capacities in recent years, so that the size of one segment of the calculation grid is 10 × 10 mm, which is, for example, to determine the suitability of the location of another pipe network or cable, near the hot-water pipe, the fineness is already sufficient. The resulting numerical model is being prepared, unlike a substantial part of the analytical methods, to calculate the full range of possible operating conditions of the hot-water and climatic conditions on the Earth's surface.

Thermal loss measurement of hot water pipelines – comparison of individual methods of calculation with measured results II.

14.8.2017 | Ing. Pavel Sláma
The article deals with the measurement of temperature field around the underground pipeline and compared heat losses derived from the measured values, the values calculated by different methodologies and its content fits into a several-cycle of articles on the topic of heat transfer in the field of underground pipeline in terms of quantifying heat loss and the extent and the intensity of the thermal field generated in the vicinity of the pipeline network.

Explosive Parameters of Hazardous Chemicals – a mixture of gases induced by gasification of biomass

7.8.2017 | Ing. Jan Skřínský, Ph.D.
Explosion parameters are currently published mainly for pure substances under standard laboratory conditions (20 °C and 101 kPa according to IUPAC). No values for the explosion characteristics of biomass and airborne gas mixtures are covered in the literature to cover non-standard conditions. In this paper, maximum explosion pressure, pmax, maximum explosion pressure rise rate (dp/dt)max, and deflagration index, KG, mixtures of hazardous chemicals from biomass gasification and measured at 25 °C, 45 °C, 90 ° C and 50 kPa, 75 kPa and 100 kPa.

Thermal loss measurement of hot water pipelines – comparison of individual methods of calculation with measured results I.

24.7.2017 | Ing. Pavel Sláma
The article deals with the measurement of temperature field around the underground pipeline and compared heat losses derived from the measured values, the values calculated by different methodologies and its content fits into a several-cycle of articles on the topic of heat transfer in the field of underground pipeline in terms of quantifying heat loss and the extent and the intensity of the thermal field generated in the vicinity of the pipeline network.

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.

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

Research gasification technology with autothermal generator

6.3.2017 | Ing. Václav Peer, Ing. Pavel Friedel, Ing. Jan Skřínský, Ph.D., Ing. Ján Vereš, Ph.D., VŠB – TU Ostrava, Výzkumné energetické centrum
The article introduces a brief history of gasification and gasification equipment located at the premises of Energy Research Center at VSB - Technical University of Ostrava. Gasification at the Energy Research Center has a ten-year tradition. The beginnings date back to 2006, when cooperation was initiated with the Ostrava company TEMEX, spol. s.r.o. by the construction of the first version of the gasifier with autothermal generator.

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
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