变频多联式空调系统再热除湿性能的实验研究

摘要

A multi⁃split variable refrigerant flow rate ( VRF) air conditioning system with reheat dehumidification was built in the paper. With the VRF system, the dehumidification amount was experimentally studied under 6 operating conditions. The influences of opening degree of reheat electronic expansion valve ( EVW) and reheat heat exchange area on outlet air temperature of indoor unit were experimen⁃tally investigated in detail. The experimental results indicated that the employment of parallel reheat heat exchanger increased the dehu⁃midification amount of the VRF system effectively;the dehumidification amounts of indoor unit 1#and 2#increased by 11. 7% -40. 4%and 10. 5% -28. 9%, respectively. Optimal EVW opening degree existed for reheat heat exchanger to obtain the maximum reheat temper⁃ature difference;the optimal EVW opening degree increased with the decrease of indoor temperature Ti . For purpose of isothermal dehu⁃midification mode, the required EVW opening degrees of indoor unit 1# and 2# were 9. 6% -9. 9% and 6. 5% -7. 0%, respectively. For purpose of dehumidification mode with To >Ti , the required EVW opening degrees increased with the decrease of both indoor tempera⁃ture and reheat heat exchange area.%本文设计并搭建了再热除湿多联式变制冷剂流率（ VRF）的实验系统，对6种工况下VRF系统的除湿量进行了实验考察，并对再热电子膨胀阀（ EVW）开度和再热器换热面积对室内机出风温度的影响进行了详细的实验研究。实验结果表明：VRF系统应用并联式再热器能有效提升除湿量，室内机1＃和2＃的再热除湿量分别增加了11�7％～40�4％和10�5％～28�9％。 EVW开度存在最优值，使得再热提升温差取得最大值，最优EVW开度随着室温Ti的降低而增加。为了实现等温除湿，室内机1＃和2＃所需的EVW开度分别为9�6％～9�9％和6�5％～7�0％。为了实现升温除湿，所需的EVW开度随室温Ti的降低和再热器面积的降低而增加。