Archiv článků od 26.3.2018 do 16.7.2018

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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.

Operational characteristics of radiators – focused on single-pipe heating system

9.7.2018 | Dr. Ing. Petr Fischer, projektant se zaměřením na jednotrubkové soustavy, Ing. Roman Vavřička, Ph.D., ČVUT v Praze, Fakulta strojní, Ústav techniky prostředí, Univerzitní Centru energeticky Efektivních Budov ČVUT v Praze
The actual performance of the radiator and the dynamics of its change affect the price of heating systems and their energy intensity. The article describes experimental performance verification in various types of wiring and also dynamics of performance change. The results are also commented on with regard to the one-pipe heating option.

Experience with Control of Heat Pump Output According to Dynamic Energy Price

2.7.2018 | Ing. Jiří Cigler, Ph.D., Feramat Cybernetics s.r.o., Praha
The contribution summarizes findings regarding implementation of predictive control algorithms of a hybrid GEOTABS system with time variable price of electric power. The real case study demonstrates that the direct control of the heat pump output according to the dynamic price can bring financial savings. However, for the full utilization of the potential, it is necessary to ensure sufficient accumulation for all types of energy consumption – the TABS system has high storage ability from its nature, yet there arises a problem with accumulation for HVAC and DHW systems.

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.

Two-component heat price and optimization options

25.6.2018 | Ing. Vladimír Galád
The basic criterion for each investment is economic efficiency. This has been simplified in heating by more or less energy consumption. This principle cannot be applied if the energy take-off price consists of several components, some of which are fixed or graduated in jumps, and others depend on the amount of energy taken. Under such circumstances, it is not right to design a technical solution solely on the basis of its lowest purchase price, but optimization steps are required. In the article, the author shows how very different the heat price can be for one and the same object in a different pricing structure. At the same time, it shows that choosing the most appropriate price structure is not a simple task that can only be done by an economist. The detailed knowledge of the heating system and its operating parameters and possibilities must also be included in the solution.
1 comment, 04.07.2018 08:56

One-pipe heating system at the Kamenice nad Lipou castle after 15 years

18.6.2018 | Dr. Ing. Petr Fischer
The discussion of the state of the single-pipe heating system, which started to be projected in 1999 and has been in operation for over 15 years.
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The Formation of Gaseous Products at Thermal Degradation of the Retardant Treated Fir Wood

18.6.2018 | Ing. Veronika Veľková, PhD., prof. RNDr. Danica Kačíková, PhD., prof. RNDr. František Kačík, PhD., Ing. Tatiana Bubeníková, PhD., Ing. Katarína Trebulová, Drevárska fakulta, Technická univerzita vo Zvolene
The work is focused on the investigation of the formation of gaseous thermal degradation products of retarded firwood. Samples of firwood were impregnated with solutions of 6 inorganic salts, thermally loaded and the arising gaseous products analyzed by SPME-GC-MS. There were 20 compounds identified, the highest amount was achieved for acetic acid and 2-furaldehyde as typical representatives of wood degradation. Most compounds were identified by degradation of samples treated with boric acid solution, at least with ammonium dihydrogenphosphate. The smallest amount of acetic acid and 2-furaldehyde was determined by treating of fir samples with sodium tetraborate solution, which appears to be a very suitable wood treatment agent for fire protection.

Experience of heating a family house with a fireplace stove with a hot-water heat exchanger

11.6.2018 | Ing. Jaroslav Dufka
The effort to minimize heating costs leads some homeowners to use fireplace inserts or fireplace stoves with a hot-water heat exchanger. Operational costs will only limit the purchase of fuel. Possible ways include timber harvesting in the wood at its own expense, or the purchase of raw wood fuel and its modification by the owner of the family house. The RD, which meets current requirements for low energy consumption, is a big difference between the heat output of the stove in the room and the actual heat demand, and this is addressed by the heat distribution throughout the house via the hot water exchanger. Specific examples show that this is a possible and appropriate way. Unfortunately, the requirements for safe operation are not always met. Using the hot water heat exchanger, the same requirements as the hot water boiler are connected.
1 comment, 14.06.2018 14:14

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

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

21.5.2018 | 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
Additional information on benzo [a] pyrene emissions is given in the contribution and the previous article “Comparison of benzo [a] pyrene emissions from different source categories” is added.

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

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
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Energy conscious reconstruction of the heating system

23.4.2018 | Ing. Karel Mrázek
Description of the heating system according to the European methodology. The theoretical part is complemented by a description of the current state of the heating systems in residential buildings that the professional public encounters. In the article, the recommended data for the correct application of the method and design procedures for assessing the energy performance of heating is given. The processed topic will thus help to understand the influence of individual variables on the economical operation of the heating system and its final evaluation.

Wood burning emissions depending on its moisture content

16.4.2018 | Ing. Michal Holubčík, PhD., Strojnícka fakulta ŽU v Žiline, Katedra energetickej techniky, prof. Ing. Jozef Jandačka, PhD., Žilinská univerzita v Žilině, KET
One of the important properties of fuel is its moisture content. Fuel with a high moisture content is not applicable to most boilers. For the correct combustion process at home, wood must be relatively dry. The article deals with the influence of the relative humidity of beech wood stored under different conditions on the energy and emission parameters of a small local heat source – a fireplace insert. The results of the experiments show the influence of the relative humidity of the wood on the heat output and efficiency of the fireplace insert and on the production of gaseous and solid pollutants. Different fuel humidity results in a different combustion process, which is reflected in the time course of heat output, efficiency and emission output, especially carbon monoxide. The results also highlighted the fact that for the ideal course of combustion of wood fuel in the local furnace too low fuel humidity is unsuitable.
1 comment, 17.04.2018 16:19

Is it possible to determine the ideal ratio of primary and consumable heat components to the distribution of heating costs?

9.4.2018 | Jozef Buzaši, Stavebné bytové družstvo Banská Bystrica
The paper analyzes the impact of the basic and consumer components of heat cost on heating on final consumer payments. It was monitored 23 residential houses of the identical building system (MBD U65).
2 comments, last 15.04.2018 08:47

Comfort of boilers for solid fuels – Part II.

2.4.2018 | Ing. Jiří Ryšavý, Ing. Jiří Horák, Ph.D., Ing. František Hopan, Ph.D., Ing. Kamil Krpec, Ph.D., Ing. Petr Kubesa, Jiří Kremer, VŠB-TU Ostrava, Výzkumné energetické centrum
The aim of this article is the summary of basic solid fuel boiler parameters, and elements included in heating system, which can influence operation of whole device, for maximum user comfort. As an associated element is menat e.g. for example accumulator tank, which ensures the extension of the heating time from the last fuel feed to boiler, thus increasing the convenience of use. It also deals with the comparison of individual solid fuel from the point of view of comfort of use, both with respect to the dustiness of the fuels, and with respect to the preparation of the fuels before their burning.

Retrofit in terms of measurement and regulation

26.3.2018 | Ing. Jan Vidim
Measuring and control devices as well as other HVAC systems, run through their lifecycle, at the end of which the system needs to be reconstructed. A key condition for a successful retrofit is to determine the required life of the refurbished equipment.
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