Performance analysis of a novel dual-nozzle ejector enhanced cycle for solar assisted air-source heat pump systems

• Published in: Renewable energy Vol. 63; pp. 735 - 740
• Main Authors: Zhu, Lin, Yu, Jianlin, Zhou, Mengliu, Wang, Xiao
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2014; Elsevier
• Subjects: Air-source; Applied sciences; Coefficients; Computer simulation; Devices using thermal energy; Ejector; Energy; Energy. Thermal use of fuels; Enhancement; Exact sciences and technology; Heat pump; Heat pumps; Heating; Mathematical models; Natural energy; Recovering; Refrigerants; Renewable energy; Solar energy; Air-source; Ejector; Heat pump; Performance; Enhancement; Solar energy; Heat source; Renewable energy
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2013.10.030

In this study, a novel dual-nozzle ejector enhanced vapor-compression cycle (DEVC) for solar assisted air-source heat pump systems is proposed. In DEVC, the use of the dual-nozzle ejector for recovering the expansion losses is a very promising approach to improve the cycle performance. A mathematical model of the DEVC is developed to predict its performance under specified operating conditions. The simulation results indicate that for the range of given operating conditions, the coefficient of performance (COP) and the volumetric heating capacity of the novel cycle using refrigerant R410A are theoretically improved by 4.60–34.03% and 7.81–51.95% over conventional ejector enhanced vapor-compression cycle (CEVC), respectively. The results imply that the solar-air source heat pump systems could take advantage of the best features of the DEVC. The potential use of DEVC therefore deserves further experimental validation. It is expected that this new cycle will be beneficial to developing dual-source coupled heat pump applications. •A dual-nozzle ejector enhanced cycle for dual-source heat pump systems is proposed.•The heating COP and volumetric heating capacity can be improved significantly.•The solar-air source heat pump system could take advantage of the proposed cycle.