Fundamentals and Applications of Stepped Pressure Cycle
A stepped pressure cycle is proposed to improve the energy efficiency of refrigeration and heat pump cycles. By constructing multiple suction and discharge pressures, the refrigerant temperatures in the evaporators and condensers underwent step changes and approached the heat source temperatures. Th...
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| Format: | Article |
| Language: | zho |
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Journal of Refrigeration Magazines Agency Co., Ltd.
2021-01-01
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| Series: | Zhileng xuebao |
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| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.03.028 |
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| author | Cao Xiang Zhang Chunlu |
| author_facet | Cao Xiang Zhang Chunlu |
| author_sort | Cao Xiang |
| collection | DOAJ |
| description | A stepped pressure cycle is proposed to improve the energy efficiency of refrigeration and heat pump cycles. By constructing multiple suction and discharge pressures, the refrigerant temperatures in the evaporators and condensers underwent step changes and approached the heat source temperatures. This helps to improve heat transfer efficiency and reduce the compression ratio. However, we found that the conclusion of energy savings for the stepped pressure cycle is conditional. Over 6.5% of the energy-saving potential is reduced because of inefficient heat exchangers or a small temperature glide of the heat transfer fluid. Moreover, an excessive subcooling degree will lead to a worse COP than a simple cycle. Finally, in this study, some application cases are summarized to demonstrate the energy-saving potential of the stepped pressure cycle. |
| format | Article |
| id | doaj-art-2002887250d7452ea24e3247a33acf75 |
| institution | DOAJ |
| issn | 0253-4339 |
| language | zho |
| publishDate | 2021-01-01 |
| publisher | Journal of Refrigeration Magazines Agency Co., Ltd. |
| record_format | Article |
| series | Zhileng xuebao |
| spelling | doaj-art-2002887250d7452ea24e3247a33acf752025-08-20T02:47:15ZzhoJournal of Refrigeration Magazines Agency Co., Ltd.Zhileng xuebao0253-43392021-01-014266504983Fundamentals and Applications of Stepped Pressure CycleCao XiangZhang ChunluA stepped pressure cycle is proposed to improve the energy efficiency of refrigeration and heat pump cycles. By constructing multiple suction and discharge pressures, the refrigerant temperatures in the evaporators and condensers underwent step changes and approached the heat source temperatures. This helps to improve heat transfer efficiency and reduce the compression ratio. However, we found that the conclusion of energy savings for the stepped pressure cycle is conditional. Over 6.5% of the energy-saving potential is reduced because of inefficient heat exchangers or a small temperature glide of the heat transfer fluid. Moreover, an excessive subcooling degree will lead to a worse COP than a simple cycle. Finally, in this study, some application cases are summarized to demonstrate the energy-saving potential of the stepped pressure cycle.http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.03.028refrigerationheat pumpenengy-savingstepped pressure cycle |
| spellingShingle | Cao Xiang Zhang Chunlu Fundamentals and Applications of Stepped Pressure Cycle Zhileng xuebao refrigeration heat pump enengy-saving stepped pressure cycle |
| title | Fundamentals and Applications of Stepped Pressure Cycle |
| title_full | Fundamentals and Applications of Stepped Pressure Cycle |
| title_fullStr | Fundamentals and Applications of Stepped Pressure Cycle |
| title_full_unstemmed | Fundamentals and Applications of Stepped Pressure Cycle |
| title_short | Fundamentals and Applications of Stepped Pressure Cycle |
| title_sort | fundamentals and applications of stepped pressure cycle |
| topic | refrigeration heat pump enengy-saving stepped pressure cycle |
| url | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.03.028 |
| work_keys_str_mv | AT caoxiang fundamentalsandapplicationsofsteppedpressurecycle AT zhangchunlu fundamentalsandapplicationsofsteppedpressurecycle |