微通道换热器在热泵型空调机组中的应用

将微通道换热器应用到北美市场典型的分体式热泵型空调机组中，并对采用微通道换热器的机组和采用铜管翅片式换热器的原机组的性能进行试验对比。试验结果表明，室内室外机均采用微通道换热器后，机组能力提高4％，制冷季节能效比（SEER）与制热季节能效系数（HSPF）分别提高2％和1％，换热器质量减轻44％，制冷剂充注量减少51％。平均结霜时间与原机组相比延长5％，平均除霜时间比原机组延长4％。此外，通过优化设计，制冷剂的分布更加均匀。对室外机微通道用换热器进行耐腐蚀性测试和压力交变疲劳测试，结果表明微通道换热器具有良好的可靠性。

Application of micro-channel heat exchangers into heat pump air-conditioning unit

The micro-channel heat exchangers are applied into typical unitary heat pump air-conditioning unit in North America market, and the performance of heat pump unit using mirco-channel heat exchangers is compared with that of heat pump unit using tube-fin heat exchangers （here after referred to as ＂baseline＂）. Experimental results show that the capacity of heat pump unit increases by 4%, SEER and HSPF increase by 2% and 1% respectively by using micro-channel heat exchangers. The weight of heat exchangers reduces by 44% ,and the refrigerant charge reduces by 51%. The average frosting time is 5% longer than the baseline,and the defrosting time is 4% longer than the baseline. In addition, the distribution of refrigerant is more uniform through distribution optimization. And the reliability of micro-channel heat exchanger is verified through the corrosion resistance test and the pressure cycle test.