Performance analysis of a residential heating system using borehole heat exchanger coupled with solar assisted PV/T heat pump

Jian Yao, Wen Jie Liu, Lu Zhang, Binshu Tian, Yanjun Dai, M Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Borehole heat exchanger (BHE) is a promising method for extracting heat from the deep geothermal energy which has been widely used for residential heating in high latitude areas. The solar assisted photovoltaic/thermal (PV/T) heat pump could convert solar energy into useful heat efficiently, and could be further used to heat water from the BHE to a higher temperature level. In this paper, a residential heating system using BHE coupled with solar assisted PV/T heat pump is therefore proposed with further performance analysis. The simulation results show that a larger mass flow rate could increase the BHE's heat extract capacity but also increase the flow resistance and pump power under nominal conditions. The circulating water would not extract heat from rock-soil if the inlet temperature exceeds 48.5 °C when mass flow rate is 12 kg/s. Furthermore, the maximum water temperature from this hybrid system could reach 40.8 °C while the solar fraction is 67.5% when the area of PV/T module is 1000 m 2, solar irradiation is 600 W/m 2 and depth of the BHE is 2500 m. In the meantime, the heating COP of this hybrid system could reach 7.4 and the system could operate independently without power input from electrical grid.

Original languageEnglish
Pages (from-to)160-175
Number of pages16
JournalRenewable Energy
Volume160
Early online date28 Jun 2020
DOIs
Publication statusE-pub ahead of print - 28 Jun 2020

Keywords

  • Borehole heat exchanger; Solar energy; PV/T; Heat pump; Residential heating
  • Solar energy
  • PV/T
  • Heat pump
  • Residential heating

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