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Abstract

The research provides a thermodynamic analysis of the theoretical model of a ventilation and air conditioning heat pump system with the ventilation air cold energy recovery depending on outside air parameters, the recovery efficiency and characteristics of a premise. A confectionery production workshop was taken as a prototype where technological conditions (temperature and humidity) must be maintained during the warm season. Calculations using the method of successive approximations to estimate air parameters at system’s nodal points were conducted. It allowed to determine theoretical refrigeration efficiency of the studied system and proved advantages of heat recuperation for smaller energy consumption. The model can be applied for design of heating, ventilation, and air conditioning units which work as a heat pump. The studied system has the highest energy efficiency in the area of relatively low environment temperatures and relative humidity which is suitable for countries with temperate continental climates characterized by low relative humidity.
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Bibliography

[1] Zhang J., Zhang H.-H., He Y.-L., Tao W.-Q.: A comprehensive review on advances and applications of industrial heat pumps based on the practices in China. Appl. Energ. 178(2016), 800–825.
[2] Chwieduk D.: Analysis of utilization of renewable energies as heat sources for heat pumps in building sector. Renew. Energ. 9(1996), 720–723.
[3] Khrustaliov B.M.: Heat Supply and Ventilation. ASV, Moscow 2007 (in Russian).
[4] Mazzeo D.: Solar and wind assisted heat pump to meet the building air conditioning and electric energy demand in the presence of an electric vehicle charging station and battery storage. J. Clean. Prod. 213(2019), 1228–1250.
[5] Chwieduk B., Chwieduk D.: Analysis of operation and energy performance of a heat pump driven by a PV system for space heating of a single family house in Polish conditions. Renew. Energ. 165(2021), 117–126.
[6] Bezrodny M., Prytula N., Tsvietkova M.: Efficiency of heat pump systems of air conditioningfor removing excessive moisture. Arch. Thermodyn. 40(2019), 2, 151–165.
[7] Bezrodny E.K., Misiura T.O.: The heat pump system for ventilation and air conditioning inside the production area with an excessive internal moisture generation. Eurasian Phys. Tech. J. 17(2020), 118–132.
[8] Adamkiewicz A., Nikonczuk P.: Waste heat recovery from the air preparation room in a paint shop. Arch. Thermodyn. 40(2019), 3, 229–241.
[9] Szreder M.: Investigations into the influence of functional parameters of a heat pump on its thermal efficiency. Teka. Commission of Motorization and Energetics in Agriculture 13(2013), 191–196.
[10] Redko A., Redko O., DiPippo R.: Low-Temperature Energy Systems with Applications of Renewable Energy. Academic Press, Elsevier, 2020.
[11] Morozjuk T.V.: The Theory of Chillers and Heat Pumps. Studija “Negociant”, Odessa 2006 (in Russian).
[12] Jaber S., Ezzat A.W.: Investigation of energy recovery with exhaust air evaporative cooling in ventilation system. Energ. Buildings 139(2017), 439–448.
[13] Bozhenko M.F.: Heat Sources and Heat Consumers. NTUU KPI “Politehnika”, Kyiv 2004 (in Ukrainian).
[14] State Building Standards of Ukraine DBN B.2.5-67: 2013, “Heating, ventilation and air conditioning”. Ministry of Regional Development, Construction and Housing of Ukraine, Kyiv 2013 (in Ukrainian).
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Authors and Affiliations

Myhailo Kostiantynovych Bezrodny
1
Tymofii Oleksiyovych Misiura
1

  1. National Technical University of Ukraine, Igor Sikorsky, Kyiv Polytechnic Institute, Prosp. Peremohy 37, 03056 Kyiv, Ukraine
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Abstract

According to The European Commission’s regulation numbers 842/2006 and 517/2014, refrigerants whose Global Warming Potential ratio is more than 150, have been prohibited in mobile air conditioning (MAC) since January 2017. Therefore, the commonly used R-134 gas has been banned. The search for a new refrigerant, which grants all the required criteria, has begun. In accordance with new European standards, the gas should have environmentally friendly properties and should not be noxious to human life while operating. In this paper, two alternative substances, which can substitute the banned R134a, have been compared. This is synthetic R1234yf, which belongs to the HFO group, and carbon dioxide, which exists in the natural environment. The chemical build, physical and thermodynamic properties have been described. Scientific articles, which present and compare the technical results of testing both refrigerants, have been discussed. Comparison results, tools used and research methodology have been described in these articles. Alternative gases have been analyzed for their environmental impact and have been checked on the toxic, flammable, impact on ozone depletion and global warming. The threats to human life due to the use of the new refrigerants have been reviewed. The thesis also comprises an economical comparison between the two gases. A short review and conclusions have been presented at the end of the article.

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Authors and Affiliations

Artur Bieniek
Michał Pysz
Łukasz Mika
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Abstract

The indoor aerosols that arc. among others, generated by air-conditioning systems arc especially significant in school facilities. The measurements carried out in the new, air-conditioned auditorium have shown that the aerosol concentrations arc strongly dependent on the operation or the air-conditioning system and the presence of students. The aerosol concentration was approximately 5 times higher when the air-conditioning (AC) system was switched on. An increased air movement inside the auditorium and the connected with it rcsusperuion of the particles settled on the indoor surfaces could be responsible for this fact. It could also result from the ineffective operation ofthe AC filters. The presence of students in the auditorium caused an increase of the coarse aerosol particles irrespectively of the AC system operation. The results of aerosol particle monitoring should be taken into consideration while controlling the AC processes in order to ensure the desired indoor air quality in this type or facilities.
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Authors and Affiliations

Bernard Połednik
Marzenna Dudzińska
Mariusz Skwarczyński

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