Archiv článků od 28.11.2016 do 30.10.2017

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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

Measurement and Evaluation of the Significant Sources of Natural Radioactivity

6.3.2017 | prof. Ing. Leonard Hobst , CSc., VUT v Brně
The natural radioactivity lives mankind throughout its development. The effects of radiation to some extent they can influence the evolutionary history of life on Earth. It is therefore important to determine what values the natural radioactivity would reach different locations of the world.

Model predictive control as a tool for ensuring and reduction of negotiated heat output

6.3.2017 | Ing. Jiří Cigler, Ph.D., Feramat Cybernetics s.r.o., Ing. Petr Kudera, Energocentrum Plus s.r.o.
Total cost of heating energy typically consists of two items. The former is the payment for consumed energy while the latter is the payment for reserved power capacity or reserved energy capacity in given period. If the customer pays for the reserved power capacity, he/she should address two questions: what is the most suitable level of reserved capacity and how to control the heating system so that the reserved capacity limits are not exceeded. Both questions can be readily solved with the aid of model based predictive controller.
6 comments, last 09.03.2017 09:32

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

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

Reliability assessment of corrosion-weakened tanks

2.1.2017 | doc. Ing. Vít Křivý, Ph.D., Ing. Monika Kubzová, Vysoká škola báňská – Technická univerzita Ostrava, Fakulta stavební
The paper introduces selected parts of the methodology for the technical state evaluation of the steel cylindrical tanks affected by the corrosion weakening. Technical conditions have been mainly worked out for the energetic company experts who are responsible for the realization and evaluation of the steel tanks diagnostics. Simplified analytical procedures have been developed to evaluate the influence of the measured corrosion weakening on the reliability of steel tank structures. The technical conditions serve mainly for a decision about the relevance of the corrosion damage: the corrosion weakening is insignificant with respect to the structural reliability or the corrosion failures are potentially dangerous with respect to the structural reliability and a detailed statistical assessment of the steel tank is necessary.
1 comment, 07.01.2017 15:43

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

The new European limits for emissions and air pollutants

29.11.2016 | Ing. Vladimír Stupavský, redakce
The European Parliament approved November 23, 2016 the new limits for selected emissions and air pollutants. For Member States resulting from this new commitments to reduce certain emissions in two stages - from 2020 and from 2030. For the Czech Republic based on commitments to the middle threshold in comparison to the commitments of other EU members. Prescribed emission reductions will be mainly sulfur dioxide, nitrogen oxides, ammonia emissions and fine particulate matter (airborne dust).
6 comments, last 30.11.2016 16:45

Restrictions on burning brown coal in small heat sources in the Czech government documents

28.11.2016 | Ing. Zdeněk Lyčka
The article describes the role of coal in the segment of small household heating heat source. Support of brown coal boilers in the framework of subsidies from European funds is in full swing, but many of these boilers failed to comply with the European Commission.
On the other hand, there are mechanisms by which the Czech Republic wants significantly reduce the burning of brown coal in small combustion sources in the foreseeable future. It is most often quoted Czech against-fossil law, but it is not alone one.
78 comments, last 15.05.2017 22:52
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