Theoretical study of heat pump system using CO2/dimethylether as refrigerant
Nowadays, HCFC22 is widely used in heat pump systems in China, which should be phased out in the future. Thus, eco-friendly mixture CO2/dimethylether is proposed to replace HCFC22. Compared with pure CO2 and pure dimethylether, the mixture can reduce the heat rejection pressure, and supp...
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VINCA Institute of Nuclear Sciences
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doaj-00c26424259f42589921996eb94f14652021-01-02T01:30:39ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362013-01-011751261126810.2298/TSCI1305261F0354-98361305261FTheoretical study of heat pump system using CO2/dimethylether as refrigerantFan Xiao-Wei0Zhang Xian-Ping1Ju Fu-Jun2Wang Fang3Zhongyuan University of Technology, School of Energy and Environment, Zhengzhou, Henan, ChinaSchool of Civil Engineering, Henan Institute of Engineering, Zhengzhou, Henan, China + School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan, ChinaZhongyuan University of Technology, School of Energy and Environment, Zhengzhou, Henan, ChinaZhongyuan University of Technology, School of Energy and Environment, Zhengzhou, Henan, ChinaNowadays, HCFC22 is widely used in heat pump systems in China, which should be phased out in the future. Thus, eco-friendly mixture CO2/dimethylether is proposed to replace HCFC22. Compared with pure CO2 and pure dimethylether, the mixture can reduce the heat rejection pressure, and suppress the flammability and explosivity of pure dimethylether. According to the Chinese National Standards on heat pump water heater and space heating system, performances of the subcritical heat pump system are discussed and compared with those of the HCFC22 system. It can be concluded that CO2 /dimethylether mixture works efficiently as a refrigerant for heat pumps with a large heat-sink temperature rise. When mass fraction of dimethylether is increased, the heat rejection pressure is reduced. Under the nominal working condition, there is an optimal mixture mass fraction of 28/72 of CO2/dimethylether for water heater application under conventional condensation pressure, 3/97 for space heating application. For water heater application, both the heating coefficient of performance and volumetric heating capacity increase by 17.90% and 2.74%, respectively, compared with those of HCFC22 systems. For space heating application, the heating coefficient of performance increases by 8.44% while volumetric heating capacity decreases by 34.76%, compared with those of HCFC22 systems. As the superheat degree increases, both the heating coefficient of performance and volumetric heating capacity tend to decrease.http://www.doiserbia.nb.rs/img/doi/0354-9836/2013/0354-98361305261F.pdfcarbon dioxidedimethyletherheat pump systemsubcriticalpinch point |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fan Xiao-Wei Zhang Xian-Ping Ju Fu-Jun Wang Fang |
spellingShingle |
Fan Xiao-Wei Zhang Xian-Ping Ju Fu-Jun Wang Fang Theoretical study of heat pump system using CO2/dimethylether as refrigerant Thermal Science carbon dioxide dimethylether heat pump system subcritical pinch point |
author_facet |
Fan Xiao-Wei Zhang Xian-Ping Ju Fu-Jun Wang Fang |
author_sort |
Fan Xiao-Wei |
title |
Theoretical study of heat pump system using CO2/dimethylether as refrigerant |
title_short |
Theoretical study of heat pump system using CO2/dimethylether as refrigerant |
title_full |
Theoretical study of heat pump system using CO2/dimethylether as refrigerant |
title_fullStr |
Theoretical study of heat pump system using CO2/dimethylether as refrigerant |
title_full_unstemmed |
Theoretical study of heat pump system using CO2/dimethylether as refrigerant |
title_sort |
theoretical study of heat pump system using co2/dimethylether as refrigerant |
publisher |
VINCA Institute of Nuclear Sciences |
series |
Thermal Science |
issn |
0354-9836 |
publishDate |
2013-01-01 |
description |
Nowadays, HCFC22 is widely used in heat pump systems in China, which should
be phased out in the future. Thus, eco-friendly mixture CO2/dimethylether
is proposed to replace HCFC22. Compared with pure CO2 and pure
dimethylether, the mixture can reduce the heat rejection pressure, and
suppress the flammability and explosivity of pure dimethylether. According
to the Chinese National Standards on heat pump water heater and space
heating system, performances of the subcritical heat pump system are
discussed and compared with those of the HCFC22 system. It can be concluded
that CO2 /dimethylether mixture works efficiently as a refrigerant for heat
pumps with a large heat-sink temperature rise. When mass fraction of
dimethylether is increased, the heat rejection pressure is reduced. Under
the nominal working condition, there is an optimal mixture mass fraction of
28/72 of CO2/dimethylether for water heater application under conventional
condensation pressure, 3/97 for space heating application. For water heater
application, both the heating coefficient of performance and volumetric
heating capacity increase by 17.90% and 2.74%, respectively, compared with
those of HCFC22 systems. For space heating application, the heating
coefficient of performance increases by 8.44% while volumetric heating
capacity decreases by 34.76%, compared with those of HCFC22 systems. As the
superheat degree increases, both the heating coefficient of performance and
volumetric heating capacity tend to decrease. |
topic |
carbon dioxide dimethylether heat pump system subcritical pinch point |
url |
http://www.doiserbia.nb.rs/img/doi/0354-9836/2013/0354-98361305261F.pdf |
work_keys_str_mv |
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