The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study | |
Qv, Dehu | |
2021 | |
发表期刊 | Energy |
ISSN | 03605442 |
卷号 | 221期号:/ |
摘要 | As a widely used technique, vapor injection plays an important role in air source heat pumps (ASHPs) which operate across a wide range of ambient temperatures. The one of primary solutions has been reported to be vapor injection based on flash-tank (FT) and intermediate heat exchanger (IHX) loops respectively. In this paper, vapor injection and its two typical configurations are experimentally investigated in an ASHP prototype. The results show that in the vapor-injection based ASHPs, the performance of FT based ASHPs is better than that of IHX based ones, and injected vapor improves mass flow rate and distribution of working fluid, with a hidden decreasing effect of exhaust entropy. In order to explore theoretical reasons, a whole system model is presented that quantifies performance enhancement potential of FT based and IHX based ASHPs respectively. The calculation results show increased refrigerant mass flow rate, its optimum distribution, and moderate injected vapor entropy contribute to performance improvement of vapor-injection based ASHPs. Further, we also visualize synergy between refrigerant mass flow and injected entropy from perspective of negentropy. At the negentropy level, FT based rather than IHX based loop brings higher heating capacity and efficiency, which is consistent with measurements from experimental research. |
关键词 | Air source heat pumps Vapor-injection configurations Refrigerant mass flow and distribution Injected entropy Negentropy |
学科门类 | 工学 |
DOI | 10.1016/j.energy.2021.119796 |
收录类别 | SCI |
语种 | 英语 |
出版者 | Elsevier Ltd |
EI入藏号 | 20210509859619 |
EI主题词 | Air source heat pumps |
EI分类号 | 619.2 Tanks - 641 Heat and Mass Transfer ; Thermodynamics - 803 Chemical Agents and Basic Industrial Chemicals |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | https://ir.lut.edu.cn/handle/2XXMBERH/146975 |
专题 | 土木工程学院 |
通讯作者 | Qv, Dehu |
作者单位 | 兰州理工大学土木工程学院 |
第一作者单位 | 土木工程学院 |
通讯作者单位 | 土木工程学院 |
第一作者的第一单位 | 土木工程学院 |
推荐引用方式 GB/T 7714 | Qv, Dehu. The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study[J]. Energy,2021,221(/). |
APA | Qv, Dehu.(2021).The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study.Energy,221(/). |
MLA | Qv, Dehu."The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study".Energy 221./(2021). |
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