Operating performances of a space heating ASHP unit with a foul outdoor coil following a prolonged cooling operation. (April 2018)

• Record Type: Journal Article
• Authors: Liu, Jingdong; Wang, Wei; Sun, Yuying; Deng, Shiming
• Is Part Of: International journal of refrigeration. Volume 88(2018)
• Page Start: 614
• Page End: 625
• Publication Date: 2018-04
• Subjects: ASHP -- Space heating -- Fouling -- Frosting -- Operating performances; Pompe à chaleur aérothermique (ASHP) -- Chauffage de locaux -- Encrassement -- Givrage -- Performances opérationnelles; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2018.01.013
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: Fouling and frosting are common but undesirable operating problems for ASHP. It is not clear for the frosting performance of ASHP with a foul outdoor coil. This study reported the operating and frosting performances of ASHP with fouling. Frost was formed on the foul outdoor coil of ASHP under non-frosting conditions. Fouling severely affected the frosting performance of ASHP during space heating. Abstract: Fouling and frosting of the outdoor coil in an air source heat pump (ASHP) unit are common but undesirable operating problems. At an increased level of air pollution, fouling of an outdoor coil becomes increasingly severe during its space cooling operation in summer and may potentially impact its frosting operation in winter. This paper reports on a field study on the operating performances of a space heating ASHP unit with a foul outdoor coil as a result of a prolonged cooling operation. Firstly, a detailed description of the field ASHP unit with the foul outdoor coil and test cases is given. Secondly, field study results for the test cases and their analyses are presented. The results demonstrate that fouling of an outdoor coil during its space cooling operation in summer can significantly impact its frosting performance during its space heating operation in winter.