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Simple index for onsite operation management of ground source heat pump systems in cooling-dominant regions

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  • Kindaichi, Sayaka
  • Nishina, Daisaku

Abstract

In ground source heat pump (GSHP) systems, large imbalances between cooling and heating loads cause a rise or decline in ground temperature because of thermal interference between multiple ground heat exchangers (GHEs). To evaluate annual changes in ground temperature, we applied a variable temperature penalty, which was simply obtained using measured data without computer simulation. First, we examined measured data for 3 years after completion of a hybrid GSHP system that had 70 borehole-type GHEs, combined with an air source heat pump unit. In the hybrid system, the GSHP showed high efficiency (coefficient of performance > 5.0) throughout the year and had a variable contribution between years with regard to cooling/heating output and time of operation. The amount of heat rejected to the ground by cooling reached ∼4.8 times that of heat extracted from the ground by heating after 3 years of operation. This imbalance produced ground temperature increases of ∼3 °C in an internal borehole. The variable temperature penalty reproduced the measured temperature increase, suggesting that the index is appropriate for assessing long-term ground temperature changes in the operation phase. This simple index allows operational improvement onsite and will aid the sustainable operation of GSHP systems in cooling-dominant regions.

Suggested Citation

  • Kindaichi, Sayaka & Nishina, Daisaku, 2018. "Simple index for onsite operation management of ground source heat pump systems in cooling-dominant regions," Renewable Energy, Elsevier, vol. 127(C), pages 182-194.
    • Handle: RePEc:eee:renene:v:127:y:2018:i:c:p:182-194
    DOI: 10.1016/j.renene.2018.04.065
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    References listed on IDEAS

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    1. Takao Katsura & Yasushi Nakamura & Tomoya Ohara & Ken Kinouchi & Katsunori Nagano, 2024. "Investigation of the Optimal Operation Method of the Heat Recovery Ground Source Heat Pump System Installed in an Actual Building and Evaluation of Energy Saving Effect," Energies, MDPI, vol. 17(14), pages 1-27, July.

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