High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants
The paper presents the design of a two-stage subcritical compressor heat pump operating in an air-to-water system and running on environmentally friendly refrigerants. The pump is dedicated to buildings where there is a high-temperature central heating system and wall-mounted radiators are used as h...
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| Format: | Article |
| Language: | English |
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Lublin University of Technology
2024-06-01
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| Series: | Advances in Sciences and Technology |
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| Online Access: | http://www.astrj.com/High-Temperature-Two-Stage-Subcritical-Heat-Pump-Running-on-Environmentally-Friendly,187103,0,2.html |
| _version_ | 1797198899525451776 |
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| author | Paweł Obstawski Krzysztof Tomczuk |
| author_facet | Paweł Obstawski Krzysztof Tomczuk |
| author_sort | Paweł Obstawski |
| collection | DOAJ |
| description | The paper presents the design of a two-stage subcritical compressor heat pump operating in an air-to-water system and running on environmentally friendly refrigerants. The pump is dedicated to buildings where there is a high-temperature central heating system and wall-mounted radiators are used as heat receivers. The first stage of the unit was supplied with R290 refrigerant and the second stage with R1234 ze(E) refrigerant. The nominal heating power of the unit is 10kW for a lower source temperature in the range -20°C÷10°C. The unit's refrigeration system was designed and simulation tests were carried out to determine the unit's operating parameters for the lower source temperature in the range -20°C÷10°C, the condensation temperature of the stage I refrigerant for values: 20°C, 25°C, 30°C and the condensation temperature of the stage II refrigerant in the range 30°C÷60°C. The value of the coefficient of performance (COP) was determined in relation to the heating power generated in stages I and II to the electricity consumed, which value, depending on the operating parameters, ranges from 2.55 to 5.6. The value of the COP related to the heating power received from the stage II condenser to the total power consumed by the stage I and II compressor, depending on the operating parameters, ranges from 1.5 to 2.9. It was found that by using a stepless adjustment of the volumetric efficiency of the stage I and II compressor, it is possible to match the heating power of stage I to the cooling power of stage II and thus increase the COP value by 50%. |
| first_indexed | 2024-04-24T07:07:11Z |
| format | Article |
| id | doaj.art-0e0a28efe8034b8ca7c17915dd629eca |
| institution | Directory Open Access Journal |
| issn | 2080-4075 2299-8624 |
| language | English |
| last_indexed | 2024-04-24T07:07:11Z |
| publishDate | 2024-06-01 |
| publisher | Lublin University of Technology |
| record_format | Article |
| series | Advances in Sciences and Technology |
| spelling | doaj.art-0e0a28efe8034b8ca7c17915dd629eca2024-04-21T18:13:27ZengLublin University of TechnologyAdvances in Sciences and Technology2080-40752299-86242024-06-0118336938110.12913/22998624/187103187103High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly RefrigerantsPaweł Obstawski0https://orcid.org/0000-0002-7808-8861Krzysztof Tomczuk1https://orcid.org/0000-0003-1894-1928Institute of Mechanical Engineering, Warsaw University of Life Sciences, Nowowiejska 24, 00-665 Warszawa, PolandInstitute of Mechanical Engineering, Warsaw University of Life Sciences, Nowowiejska 24, 00-665 Warszawa, PolandThe paper presents the design of a two-stage subcritical compressor heat pump operating in an air-to-water system and running on environmentally friendly refrigerants. The pump is dedicated to buildings where there is a high-temperature central heating system and wall-mounted radiators are used as heat receivers. The first stage of the unit was supplied with R290 refrigerant and the second stage with R1234 ze(E) refrigerant. The nominal heating power of the unit is 10kW for a lower source temperature in the range -20°C÷10°C. The unit's refrigeration system was designed and simulation tests were carried out to determine the unit's operating parameters for the lower source temperature in the range -20°C÷10°C, the condensation temperature of the stage I refrigerant for values: 20°C, 25°C, 30°C and the condensation temperature of the stage II refrigerant in the range 30°C÷60°C. The value of the coefficient of performance (COP) was determined in relation to the heating power generated in stages I and II to the electricity consumed, which value, depending on the operating parameters, ranges from 2.55 to 5.6. The value of the COP related to the heating power received from the stage II condenser to the total power consumed by the stage I and II compressor, depending on the operating parameters, ranges from 1.5 to 2.9. It was found that by using a stepless adjustment of the volumetric efficiency of the stage I and II compressor, it is possible to match the heating power of stage I to the cooling power of stage II and thus increase the COP value by 50%.http://www.astrj.com/High-Temperature-Two-Stage-Subcritical-Heat-Pump-Running-on-Environmentally-Friendly,187103,0,2.htmltwo-stage heat pumpcopr290r1234ze(e) |
| spellingShingle | Paweł Obstawski Krzysztof Tomczuk High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants Advances in Sciences and Technology two-stage heat pump cop r290 r1234ze(e) |
| title | High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants |
| title_full | High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants |
| title_fullStr | High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants |
| title_full_unstemmed | High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants |
| title_short | High-Temperature Two-Stage Subcritical Heat Pump Running on Environmentally Friendly Refrigerants |
| title_sort | high temperature two stage subcritical heat pump running on environmentally friendly refrigerants |
| topic | two-stage heat pump cop r290 r1234ze(e) |
| url | http://www.astrj.com/High-Temperature-Two-Stage-Subcritical-Heat-Pump-Running-on-Environmentally-Friendly,187103,0,2.html |
| work_keys_str_mv | AT pawełobstawski hightemperaturetwostagesubcriticalheatpumprunningonenvironmentallyfriendlyrefrigerants AT krzysztoftomczuk hightemperaturetwostagesubcriticalheatpumprunningonenvironmentallyfriendlyrefrigerants |