An Experimental Study on the Improvement of Reverse Cycle Defrosting Performances for a Cascade Air Source Heat Pump using Thermal Energy Storage Based Defrosting Method. (2017)

• Record Type: Journal Article
• Authors: Qu, Minglu; Qin, Ruifeng; Tang, Yongbo; Fan, Yanan; Li, Tianrui
• Is Part Of: Procedia engineering. Volume 205(2017)
• Page Start: 818
• Page End: 825
• Publication Date: 2017
• Subjects: Defrosting -- Air source heat pump -- Cascade -- Thermal energy storage; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.10.017
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: Applying cascade air source heat pumps (CASHPs) in colder areas is a promising option to encourage a wider application of air source heat pumps (ASHPs) due to their advantage of a higher energy efficiency. When CASHPs are operated in heating mode, frosting/defrosting has been problematic. This paper proposed a novel thermal energy storage (TES) based reverse cycle defrosting method for CASHPs which can provide heat to defrosting and continuously supply heat to the indoor space. The comparative experiments on its operating performances was carried out by comparing standard hot gas by-pass defrosting method. The test results suggested that when using the TES based reverse cycle defrosting method, defrosting duration was shortened by ~64.3%, and defrosting energy consumption reduced by ~30.3%, as compared to those when using the standard hot gas by-pass defrosting method, and ~60% of the normal heating capacity can be provided to the indoor space during defrosting.