摘要
探讨管翅式换热器和多流程微通道换热器在同一电动汽车热泵空调系统中的性能差异,为电动汽车热泵空调系统中微通道设计和结霜控制的后续研究提供依据。试验比较在不同测试工况下采用微通道换热器和管翅式换热器的热泵型电动汽车空调系统的制冷特性及制热特性,结果表明:系统采用微通道换热器,车内外换热器体积分别减少57.6%和62.5%,有效减轻空调系统重量,有利于增加电动汽车续驶里程;制冷剂充注量减少26.5%,有利于降低温室效应。制冷工况下,系统制冷量和制冷系数分别降低4.1%～10.7%和1.7%～4.8%,说明将多流程微通道换热器应用于热泵系统还存技术难点,需要在微通道换热器流程设计、流量分配及压降等方面进行改进;制热工况下,系统制热量和制热性能系数分别降低1%～5%和4.2%～9.7%,但单位面积制热量提高16.7%～21.0%,当室外温度低于7℃时,室外侧微通道换热器出现严重结霜,极大影响系统的制热量和制热性能系数,需要进一步研究换热器结霜特性及融霜控制策略。
One enhanced and baseline heat pump air conditioning system（HPACS） for electrical vehicle（EV） are established including the new multi-flow micro-channel beat exchangers（HE） and the traditional fin-and-tube heat exchangers（HE）, respectively. In order to provide theoretical guidance to the follow-up research of EV HPACS based on novel micro-channel design and frosting control, the performance differences are discussed between the two systems, the refrigeration and heating characteristics of both systems are compared under variable test conditions and the results show that volume of the indoor and outdoor heat exchangers decrease by 57.6% and 62.5%, respectively, effectively reduce air conditioner＇s weight which contributes to the increase of EV＇s Life mileage; at the same time, the enhanced system with compact HE could reduce air conditioner system＇s charge by 26.5% which benefits to reduce the greenhouse effect. The cooling capacity and refrigeration coefficient of performance of the enhanced system reduce by 4.1%-10.7% and 1.7%-4.8%, respectively. It indicates that there are still some technical barriers require to be managed in case of multi-flow micro-channel HE applied in HPACS, for example, the flow path design of micro-channel HE, flow distribution and pressure drop in micro-channel HE. The heating capacity and heating performance coefficient of the enhanced system reduce by 1%-5% and 4.2%-9.7%, but the heating capacity per unit area increase by 16.7%-21.0%. The outdoor micro-channel HE will be frost when the outdoor temperature below 7 ＊C, it immensely affects the heating capacity and the heating performance coefficient of enhanced system and demands to improve the frosting control strategy.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2012年第14期141-147,共7页
Journal of Mechanical Engineering
基金
广东省战略性新兴产业发展专项
广东省教育部产学研重点(2011A090200018)资助项目
关键词
电动汽车
热泵空调
微通道换热器
管翅式换热器
性能系数
Electrical vehicle Heat pump air conditioning Microchannel heat exchanger Fin-and-tube exchangerCoefficient of performance
