Analysis of operation performance of three indirect expansion solar assisted air source heat pumps for domestic heating. (15th January 2022)

• Record Type: Journal Article
• Authors: Yang, Li Wei; Hua, Nan; Pu, Jin Huan; Xia, Yu; Zhou, Wen Bin; Xu, Rong Ji; Yang, Tong; Belyayev, Yerzhan; Wang, Hua Sheng
• Is Part Of: Energy conversion and management. Volume 252(2022)
• Publication Date: 2022-01-15
• Subjects: Solar assisted air source heat pump -- Seasonal performance factor -- Domestic heating -- Solar thermal energy -- Numerical simulation; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2021.115061
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Three indirect expansion solar assisted air source heat pumps are numerically studied. Space heating and hot water performances of three heat pumps are examined in detail. Their yearly seasonal performance factors are higher than 4.4 in high latitude regions. The heat pumps are economically applicable in high latitude regions. Abstract: To achieve the goal set for net-zero emissions of greenhouse gases in the UK by 2050, the domestic heating must be decarbonised. Solar assisted air source heat pumps, integrating solar collector, thermal energy storage tank and heat pump, offers a promising alternative application under the UK weather conditions. Literature review shows that investigations of solar assisted air source heat pumps in the regions like the UK are still insufficient. The serial, parallel and dual-source indirect expansion solar assisted air source heat pumps are modelled and simulated under the weather conditions in London using TRNSYS to investigate the operation performance over a typical year. These three heat pumps are applied to provide space heating and hot water of 300 L per day for a typical single-family house. The simulation results show comparisons of the three systems. The serial type heat pump shows the highest seasonal performance factor of 5.5, but requiring the largest sizes of the solar collector and thermal energy storage tank. The dual-source and parallel type heat pumps show slightly lower seasonal performance factors of 4.4 and 4.5, respectively, requiring smaller sizes of solar collector and thermal energy storage tank. Furthermore, the results show that the air source part contributes to an important proportion of the heat provision and stable operation of the systems. The yearly seasonal performance factor higher than 4.4 achievable by the three heat pumps suggests that they are potentially applied in the regions with relatively lower solar irradiance. The economic analyses indicate that the parallel and dual-source type heat pumps provide good alternatives to replace the gas-boiler heating system.