Performance analysis of hybrid ground-coupled heat pump system with multi-functions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

45 Scopus Citations
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Author(s)

  • Tian You
  • Baolong Wang
  • Wei Wu
  • Wenxing Shi
  • Xianting Li

Detail(s)

Original languageEnglish
Pages (from-to)47-59
Journal / PublicationEnergy Conversion and Management
Volume92
Online published2 Jan 2015
Publication statusPublished - 1 Mar 2015
Externally publishedYes

Abstract

Underground thermal imbalance is a significant problem for ground-coupled heat pump (GCHP) systems that serve predominately heated buildings in cold regions, which extract more heat from the ground and inject less heat, especially in buildings requiring domestic hot water (DHW). To solve this problem, a previously developed heat compensation unit with thermosyphon (HCUT) is integrated with a GCHP unit to build a hybrid GCHP system. To improve the energy savings of this hybrid GCHP system, the HCUT unit is set to have multiple functions (heat compensation, direct DHW and direct space heating) in this paper. To analyze the improved system performance, a hotel requiring air-conditioning and DHW is selected and simulated in three typical cold cities using the dynamic software DeST and TRNSYS. The results indicate that the hybrid GCHP system can maintain the underground thermal balance while keeping the indoor air temperature within the design range. Furthermore, the HCUT unit efficiently reduces the energy consumption via its multi-functional operations. Compared to the previous system that only used HCUT for heat compensation, adding the direct DHW function further saves 7.5-11.0% energy in heat compensation (HC) and DHW (i.e., 3.6-4.8% of the whole system). Simultaneously adding the direct DHW and space heating functions to the HCUT can save 9.8-12.9% energy in HC and DHW (i.e., 5.1-6.0% of the whole system). The hybrid GCHP system with a multi-functional HCUT provides more energy savings while maintaining the underground thermal balance in cold regions that demand both air-conditioning and DHW.

Research Area(s)

  • Cold regions, Domestic hot water, Energy-saving, Ground-coupled heat pump, Heat compensation, Thermosyphon

Citation Format(s)

Performance analysis of hybrid ground-coupled heat pump system with multi-functions. / You, Tian; Wang, Baolong; Wu, Wei et al.

In: Energy Conversion and Management, Vol. 92, 01.03.2015, p. 47-59.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review