System performance and defrosting test of new air-water double source composite heat pump system

doi:10.11949/j.issn.0438-1157.20170041

Abstract

Abstract:

In order to improve many disadvantages that the heat pump system has when it uses the reverse-cycle defrosting method in the low temperature environment, a new air-water double source composite heat pump system (AWDSHPS-N) was presented. This system has a new preheating and defrosting function. AWDSHPS-N has defrosted for 5 min and has 5 different defrosting ways, such as the condenser outlet refrigerant recooling defrosting, the low temperature-hot water defrosting, and so on. It can be put into different modes by changing some relevant valves or starting and stopping the pump of the low temperature water. In this way, the heat output power of AWDSHPS-N may be reduced dramatically, but the system can produce heating continuously. A test-bed including constant temperature and humidity environment storehouse and a low temperature water tank were set up to get operating data for coefficient of performance (COP) of AWDSHPS-N. The environment storehouse imitates the change in outdoor environment by keeping the temperature and the humidity at a certain level constantly, and the low temperature water tank with two electric heating bars can be thought as a low temperature heating source of a solar energy system or a waste heat system. By heating the water from 18℃ to 51℃, the COP of AWDSHPS-N was tested and analyzed in air source heating mode (ASHM), water source heating mode (ASHM), water source heating mode (WSHM) and air-water double source heating mode (AWSHM), respectively. By calculating, the COP of AWSHM is 6.1%-20.5% higher than ASHM. When the ambient temperature and the low temperature water are both above 15℃, the COP of AWSHM is the best one, and the COP of WSHM is the last one among these three heating modes.

Key words: heat pump, double-heat sources, renewable energy, system performance, optimal design, defrosting, experimental validation

摘要：

针对低温环境条件下热泵逆循环除霜存在的诸多问题，提出了一套具备预热除霜功能的新型空气-水双热源复合热泵系统（new air-water double source composite heat pump system，AWDSHPS-N），通过阀门切换和低温水源侧水泵的启停控制可直接进入除霜模式，除霜过程中可保证制热的连续性，每次除霜时长不超过5 min。利用恒温恒湿环境仓模拟室外环境条件，可调控水温的低温水箱模拟太阳能等低温热源搭建AWDSHPS-N实验台，对不同测试工况下，单空气源制热模式（air source heating mode，ASHM）、单水源制热模式（water source heating mode，WSHM）、空气-水双热源制热模式（air-water source heating mode，AWSHM）3种制热模式将水从18℃加热至51℃的系统性能系数（coefficient of performance，COP）进行了实验，结果表明：AWSHM的COP比ASHM提高了6.1%~20.5%；当环境温度和低温水源温度均高于15℃时，系统COP高低顺序为AWSHM、ASHM和WSHM。

关键词: 热泵, 双热源, 再生能源, 系统性能, 优化设计, 除霜, 实验验证

CLC Number:

TK519

XU Junfang, ZHAO Yaohua, WANG Jieteng, ZHAO Huigang, LIANG Yuanyuan. System performance and defrosting test of new air-water double source composite heat pump system[J]. CIESC Journal, 2017, 68(11): 4301-4308.

徐俊芳, 赵耀华, 王皆腾, 赵会刚, 梁元元. 新型空气-水双热源复合热泵系统性能和除霜实验[J]. 化工学报, 2017, 68(11): 4301-4308.

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