基于辐射和对流换热新型供暖末端的空气源热泵除霜性能试验研究
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摘要
常规空气源热泵在低温环境中运行时普遍存在结霜和除霜现象,由于常规室内盘管储能不足,导致逆循环除霜效果不理想。同时,基于强制对流换热的常规空气源热泵常常会引起室内热分层现象和强烈的吹风感,导致人体热舒适性较差。为解决上述问题,本文结合辐射供暖具有较高热舒适性的优点,提出一种基于辐射和强制对流换热的新型供暖末端,搭建空气源热泵辐射和对流换热性能试验台,对其除霜性能进行试验研究。结果表明:除霜周期内,该系统压缩机功率平均值为429.5 W,除霜能效比为2.88,除霜能效比高于常规空气源热泵系统。
The frosting and defrosting generally exist for conventional air source heat pumps running in low-temperature environment.Due to the insufficient energy stored in a conventional indoor coil,the defrosting performance of the reverse cycle defrosting is not ideal.Meanwhile,the conventional air source heat pump based on forced convective heat transfer often causes indoor thermal stratification and strong blowing sensation,resulting in poor thermal comfort.In order to solve the problem,considering the advantages of a radiant heating system with higher thermal comfort,a new type of heating terminal is presented based on radiation and forced convection heat transfer.In addition,the experimental platform of the radiation and forced convection heat transfer performance of air source heat pump is set up,and the defrosting performance of system is experimentally analyzed.The results show that during defrosting period,the average power of the compressor is 429.5 W,the defrosting energy efficiency ratio is 2.88,which is higher than that of the conventional air source heat pump system.
The frosting and defrosting generally exist for conventional air source heat pumps running in low-temperature environment.Due to the insufficient energy stored in a conventional indoor coil,the defrosting performance of the reverse cycle defrosting is not ideal.Meanwhile,the conventional air source heat pump based on forced convective heat transfer often causes indoor thermal stratification and strong blowing sensation,resulting in poor thermal comfort.In order to solve the problem,considering the advantages of a radiant heating system with higher thermal comfort,a new type of heating terminal is presented based on radiation and forced convection heat transfer.In addition,the experimental platform of the radiation and forced convection heat transfer performance of air source heat pump is set up,and the defrosting performance of system is experimentally analyzed.The results show that during defrosting period,the average power of the compressor is 429.5 W,the defrosting energy efficiency ratio is 2.88,which is higher than that of the conventional air source heat pump system.
引文
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[5]费玉敏,王随林,闫全英.新型低温热水辐射供暖地面与墙面构造试验研究[J].暖通空调,2011,41(12):71-73.
[6]李梦竹,张宝怀.辐射供暖房间空调器的特性分析[J].建筑热能通风空调,2015,34(2):22-25.
[7]DING Y J,MA G Y,CHAI Q H,et al.Experiment investigation of reverse cycle defrosting methods on air source heat pump with TXV as the throttle regulator[J].International Journal of Refrigeration,2004,27:671-678.
[8]DONG J K,DENG S M,JIANG Y Q,et al.An experimental study on defrosting heat supplies and energy consumptions during a reverse cyclede frost operation for an air source heat pump[J].Applied Thermal Engineering,2012,37:380-387.
[9]黄东,袁秀玲,陈蕴光.节流机构对风冷热泵冷水机组逆循环除霜时间的影响[J].西安交通大学学报,2003,37(5):512-518.
[2]TAKAO N.‘Heat Pumps-status and Trends’in Asia and the Pacific[J].International Journal of Refrigeration,2002,25(4):405-413.
[3]YAO Y,JIANG Y Q,DENG S M,et al.A study on the performance of the airside heat exchanger under frosting in an air source heat pump water heater/chiller unit[J].International Journal of Heat and Mass Transfer,2004,47(17-18):3745-3756.
[4]张继刚.壁挂式空调房间内流场温度场特性与人体热舒适的研究[D].济南:山东大学,2007:52-55.
[5]费玉敏,王随林,闫全英.新型低温热水辐射供暖地面与墙面构造试验研究[J].暖通空调,2011,41(12):71-73.
[6]李梦竹,张宝怀.辐射供暖房间空调器的特性分析[J].建筑热能通风空调,2015,34(2):22-25.
[7]DING Y J,MA G Y,CHAI Q H,et al.Experiment investigation of reverse cycle defrosting methods on air source heat pump with TXV as the throttle regulator[J].International Journal of Refrigeration,2004,27:671-678.
[8]DONG J K,DENG S M,JIANG Y Q,et al.An experimental study on defrosting heat supplies and energy consumptions during a reverse cyclede frost operation for an air source heat pump[J].Applied Thermal Engineering,2012,37:380-387.
[9]黄东,袁秀玲,陈蕴光.节流机构对风冷热泵冷水机组逆循环除霜时间的影响[J].西安交通大学学报,2003,37(5):512-518.