| 摘要: |
| PTC加热效率较低对电动汽车行驶里程影响较大，因此开发效率更高的热泵系统十分必要。实验搭建了四通阀热泵系统，并将两种不同流程排布的小管径换热器与微通道换热器分别被用于室外侧，在制冷、制热模式下进行了实验对比，由实验结果可知，在制热模式低风速下，小管径换热器相比微通道换热器，能力可以高出10.5%，而COP与微通道换热器相近；在制冷模式低风速下，小管径换热器样件能力可高出3.8%，COP可高出22.8%。但随风速的提高，小管径换热器能力和COP提升并不明显，而微通道换热器随风速提升幅度较大，由上可知，在风速较低的怠速和城市工况中，使用小管径换热器作为车用热泵的外侧换热器使用拥有一定的优势。 |
| 关键词: 电动汽车 能力与能效 四通阀热泵系统 换热器 |
| DOI： |
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| 基金项目:国家自然科学基金（51278302、51108263）资助项目。 |
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| Experimental Study on Two Kinds of Heat Exchangers in Four-way-valve Heat Pump System of Electric Vehicles |
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| Abstract: |
| Low efficiency of PTC in electrical vehicles would cut down its travelled distance, so it’s necessary to design high efficiency heat pump system. Two kinds of heat exchangers were used as outside heat exchangers (HX) in four-way-valve heat pump system, and experimental study was finished under both heating and cooling modes. The results showed, under low face velocity in heating model, small diameter tube HX had higher capacity by 10.5%, and the same COP compared with parallel flow HX. Under low face velocity in cooling model, small diameter tube HX had higher capacity by 3.8%, and higher COP by 22.8% compared with parallel flow HX. With the increasing of wind velocity, capacity and COP with small diameter tube HX increased little; however, the one with parallel flow HX had a higher increasing. It is concluded that heat pump system used small diameter tube HX had a potential prospect under low wind velocity. |
| Key words: electrical vehicles capacity and COP four-way-valve heat pump system heat exchanger |
