Recent Advances in Transcritical CO 2 (R744) Heat Pump System: A Review

Rajib Uddin Rony, Huojun Yang, Sumathy Krishnan and Jongchul Song
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Rajib Uddin Rony: College of Engineering, North Dakota State University, Fargo, ND 58108, USA
Huojun Yang: College of Engineering, North Dakota State University, Fargo, ND 58108, USA
Sumathy Krishnan: College of Engineering, North Dakota State University, Fargo, ND 58108, USA
Jongchul Song: Architectural Engineering and Construction Science, Kansas State University, Manhattan, KS 66506, USA

Energies, 2019, vol. 12, issue 3, 1-35

Abstract: Heat pump (HP) is one of the most energy efficient tools for address heating and possibly cooling needs in buildings. Growing environmental concerns over conventional HP refrigerants, chlorofluorocarbons (CFCs), and hydrofluorocarbons (HFCs) have forced legislators and researchers to look for alternatives. As such, carbon dioxide (R744/CO 2 ) has come to light due to its low global warming potential (GWP) and zero ozone depleting characteristics. Even though CO 2 is environmentally benign, the performance of CO 2 HP has been of concern since its inception. To improve the performance of CO 2 HP, research has been playing a pivotal role in developing functional designs of heat exchangers, expansion devices, and compressors to suit the CO 2 transcritical cycle. Different CO 2 HP cycles coupled with auxiliary components, hybrid systems, and refrigerant mixtures along with advanced control strategies have been applied and tested. This paper presents a complete overview of the most recent developments of transcritical CO 2 HPs, their components, and applications.

Keywords: CO 2; heat pumps; transcritical cycle; COP (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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