Improving defrosting performance of cascade air source heat pump using thermal energy storage based reverse cycle defrosting method
Improving defrosting performance of cascade air source heat pump using thermal energy storage based reverse cycle defrosting method
复制标题
基于储热的逆循环除霜方法提高复叠式空气源热泵除霜性能
DOI：
10.1016/j.applthermaleng.2017.04.146
复制
发表时间：
2017-07-05
影响因子：
6.4
通讯作者：
Li Zhao
中科院分区：
文献类型：
--
作者：
Qu Minglu;Li Tianrui;Li Zhao
To encourage a wider application of air source heat pumps (ASHPs) to colder areas due to the advantage of a higher energy efficiency, adopting cascade air source heat pumps (CASHPs) is a promising option. When CASHPs are operated in heating mode, frosting/defrosting has been problematic. However, the defrosting methods commonly used by conventional ASHPs cannot be directly applied to CASHPs. Therefore, a thermal energy storage (TES) based reverse cycle defrosting method for CASHPs has been proposed and an experimental study on its operating performances was carried out. Comparative tests when using both the standard hot gas by-pass defrosting method and the TES based reverse cycle defrosting method were carried out. The results suggested that when using the TES based reverse cycle defrosting method, defrosting duration was shortened by 71.4-80.5%, and defrosting energy consumption reduced by 65.1-85.2%, as compared to those when using the standard hot gas by-pass defrosting method. In addition, the thermal energy stored can also become a source for indoor space heating, and 37.7% of the normal heating capacity can be provided to a heated indoor environment when using the TES based reverse cycle defrosting method. (C) 2017 Elsevier Ltd. All rights reserved.
