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Solar and ground source heat-pump system

Author

Listed:
  • Bi, Yuehong
  • Guo, Tingwei
  • Zhang, Liang
  • Chen, Lingen

Abstract

Theoretical and experimental studies were performed for a solar-ground source heat-pump (SGSHP) system with a vertical double-spiral coil (VDSC) ground heat-exchanger (GHX). The heating mode of the SGSHP system is alternated between a solar energy-source heat-pump (SSHP) and a ground-source heat-pump (GSHP) using a low-grade energy utilization system built by the authors. The measured performances were for the SSHP, GSHP and SGSHP systems, as well as the ground heat-exchanger (GHX). The heat absorption rate per unit of ground surface area occupied by the GHX is shown to be 18 times greater than a single-pipe horizontal heat-exchanger. The coefficient of performance (COP) of the system with GHX is a 21% improvement over the system with the single-pipe horizontal heat-exchanger. The underground two-dimensional symmetry temperature field of the GHX was simulated using the volume-control method. The analytical results are compared with the experimental data. The mathematical model presented herein may provide design guidance for the design of a GHX for GSHP systems. The heat-output performance of a solar collector, which was used for a solar-ground source heat-pump with the heating mode, is also predicted. Valuable numerical results were obtained in the experimental study of the real SGSHP system.

Suggested Citation

  • Bi, Yuehong & Guo, Tingwei & Zhang, Liang & Chen, Lingen, 2004. "Solar and ground source heat-pump system," Applied Energy, Elsevier, vol. 78(2), pages 231-245, June.
    • Handle: RePEc:eee:appene:v:78:y:2004:i:2:p:231-245
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