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A chronological review of advances in solar assisted heat pump technology in 21st century

Badiei, A.; Golizadeh Akhlaghi, Y.; Zhao, X.; Shittu, S.; Xiao, X.; Li, J.; Fan, Y.; Li, G.


Y. Golizadeh Akhlaghi

X. Xiao

Y. Fan


This paper presents a comprehensive review on developments and advances of Solar Assisted Heat Pump technology reported in 21st century. Combination of thermal and photovoltaic solar collectors with heat pumps has been widely used in recent decades for simultaneous heat, hot water and power generation for a broad range of applications, from providing domestic and commercial buildings with heat and power to manufacturing and agricultural applications. This review critically analyses the research reported in past two decades with particular attention to the works with substantial importance for future development of the technology. Four distinctive investigation periods were considered and key developments and dominant technologies at each period were reported. The main novelties and breakthroughs in solar assisted heat pump technology, as identified by this review, are: (1) The ban on R-12 refrigerant which lead to dominance of R-134A refrigerant for a wide range of systems and applications, (2) Increasing interest in Solar-assisted Ground Source Heat Pumps following the technological advances that made the utilization of such systems cost effective, (3) Advances in numerical analysis methods and use of Artificial Intelligence applications in investigating performance and effectiveness of various systems, and (4) Integrating the Photovoltaic/Thermal collectors with heat pumps for simultaneous heat and power generation resulting in improved performance and reliable operation of systems under severe operating conditions.


Badiei, A., Golizadeh Akhlaghi, Y., Zhao, X., Shittu, S., Xiao, X., Li, J., …Li, G. (2020). A chronological review of advances in solar assisted heat pump technology in 21st century. Renewable & sustainable energy reviews, 132,

Journal Article Type Article
Acceptance Date Jul 20, 2020
Online Publication Date Jul 30, 2020
Publication Date 2020-10
Deposit Date Aug 3, 2020
Publicly Available Date Jul 31, 2021
Journal Renewable and Sustainable Energy Reviews
Print ISSN 1364-0321
Electronic ISSN 1879-0690
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 132
Article Number 110132
Keywords Heat pump; Solar assisted; Direct expansion; Experiment; Solar energy; Photovoltaic; Thermal
Public URL