Archiv článků od 8.1.2018 do 23.4.2018

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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.

Comfort of solid fuel boilers – Part I.

26.3.2018 | 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.

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.
3 comments, last 21.03.2018 08:45

Resistance of refractories against acidic environment

12.3.2018 | Ing. Daniel Mátl, Ing. Lenka Nevřivová, Ph.D., Ústav technologie stavebních hmot a dílců, Fakulta stavební, Vysoké učení technické v Brně
There are applications of refractory concretes for places where these are exposed to corrosive environments. This text deals with both description the corrosive effects and methodology of their testing. One of the most important properties of materials, affecting the chemical corrosion resistance, is their density. The second part of this text is focused on testing the refractory concretes which are currently used for applications. The aggregates were tested for the resistance to sulfuric acid.

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

Heat Sources for Buildings with Total Zero Energy Needs

5.3.2018 | prof. Ing. Dušan Petráš, PhD.
The author analyzes the conditions that create the criteria for heat sources to meet the requirements for buildings with almost zero energy consumption NZEB.
2 comments, last 05.03.2018 12:14
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Installation and acceptance of hot-water heating systems

26.2.2018 | Ing. Karel Mrázek
When rebuilding the HVAC systems, it is necessary to respect the implementing regulations which define the framework of the certified technical procedures. In a number of examples of practice, it shows the absence of these facts. The article deals with the implementing standards and recommendations for the assembly and acceptance process of heating systems. It is designed not only for assembly companies, but also for investors and administrators who take over the work and then use it.

Detail of the chimney system passing through the combustible roof and ceiling structure

26.2.2018 | Ing. Zuzana Lacová, doc. Ing. Juraj Olbřímek, PhD., STU Stavebná fakulta, Bratislava, Slovenská republika
The detail of the chimney system passage is one of the possible details, from a fire point of view, that occurred due to the installation of new chimney systems in to the construction of the building. The chimney system passing through the combustible structure is one of the most dangerous details in the building, from a fire safety point of view, and as practice shows, is often very underestimated. An appropriate solution for the chimney passage requires the knowledge and correct design, as well as the realization and consequently correct use of the thermal appliance and the chimney system. The article deals with passage according to the requirements of the national standards for fire segments and design according to STN EN for chimneys.

Requirements for indirectly heated pressure cylinder water heaters

19.2.2018 | Ing. Jakub Vrána, Ph.D., Ústav TZB, Fakulta stavební VUT v Brně
Revised CSN EN 12897 “Water Supply – Indirectly heated pressure (closed) storage water heaters” applies to indirectly heated pressure container heaters up to a volume of 2000 liters usable in internal water conduits at overpressure from 0.05 MPa to 1.0 MPa. The author draws attention to important provisions of the standard that will be reflected in practice.
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
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Economic assessment of energy saving measures in apartment buildings - HVAC systems

5.2.2018 | Ing. Karel Mrázek
The article deals with the economic assessment of energy saving measures as a further continuation of the topic of reconstruction of HVAC systems in apartment buildings. Selection of economical lifespan for selected elements and functional parts with preventive maintenance costs is provided. Finally, an example of the apartment building evaluation is given.

What requirements have to be met by a family house electrically heated a and what impact should a change in the primary energy conversion factor?

29.1.2018 | prof. Ing. Karel Kabele, CSc., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovtavební, katedra TZB, Ing. Miroslav Urban, Ph.D., ČVUT v Praze, Univerzitní centrum energeticky efektivních budovVUT v Praze, Fakulta stavební, katedra TZB
Family houses with the concept of electric heating by means of an electric boiler or electric direct heating system and the preparation of hot water in an electrically heated tank do not meet the requirement for the energy performance of buildings. The authors analyze the magnitude of the conversion factor and other parameters that would meet ENB requirements.
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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
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Documents for the reconstruction of HVAC system in a residential building

22.1.2018 | Ing. Alena Horáková
The first article of the series on energetic reconstruction HVAC systems in residential buildings is focused on the preparation of project with minimum necessary information that should be prior to any commencement reconstruction. In current practice this part is significantly neglected.

The ecological effect of installing condensing gas boilers

22.1.2018 | Ing. Pavel Kvasnička, Ph.D., Bosch Termotechnika s.r.o. - obchodní divize JUNKERS, doc. Ing. Michal Kabrhel, Ph.D., ČVUT v Praze, Fakulta stavební
The authors analyze the ecological parameters of gas condensing boilers, the presence of these boilers in operation and estimate future developments. On the basis of the analysis, they conclude how favorable the transition to condensing technology will be reflected in the production of undesirable emissions of nitrogen oxides.
10 comments, last 22.01.2018 19:38

Replacing the old atmospheric gas boiler with a new condensing boiler

8.1.2018 | Ing. Josef Hodboď, videoreportáž: Ing. Petr Bohuslávek, redakce
The text and video describe a typical replacement of the old suspended gas boiler in the apartment. The reason for the exchange was not only the effort to save gas but also to protect our health and life, ie to eliminate the risks associated with older boilers with the air supply from the room.
12 comments, last 12.01.2018 18:41
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