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Performance analysis of an R744 ground source heat pump system with air-cooled and water-cooled gas coolers

Abstract

In order to decrease the earth's energy imbalance degree, a R744 ground source heat pump system (GSHPS) with air-cooled and water-cooled gas coolers was designed, and the performances of this system were analyzed numerically. The results show that, for the proposed R744 system in different regions, the earth's energy imbalance degree can always be decreased to zero by optimizing the cooling load proportion of air-cooled gas cooler. Comparing with the system without air-cooled gas cooler, the investment cost of the proposed R744 system is decreased by 14.5%~25.5% due to the decreasing cost of ground heat exchanger, and the coefficient of performance is increased. With the increase of ground heat exchanger depth, the performance deteriorates, and the ground heat exchanger with shorter depth is preferred in the GSHPS. The investment and operation costs of the proposed R744 system are lower than that of the existing R134a system.
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Category

Academic article

Language

English

Author(s)

  • Haitao Hu
  • Trygve Magne Eikevik
  • Petter Nekså
  • Armin Hafner
  • Guoliang Ding
  • Qingnan Huang
  • Jingjing Ye

Affiliation

  • SINTEF Energy Research / Gassteknologi
  • SINTEF Energy Research / Termisk energi
  • Norwegian University of Science and Technology
  • Shanghai Jiao Tong University

Year

2016

Published in

International journal of refrigeration

ISSN

0140-7007

Volume

63

Page(s)

72 - 86

View this publication at Norwegian Research Information Repository