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

被引:13
作者
Kindaichi, Sayaka [1 ]
Nishina, Daisaku [1 ]
机构
[1] Hiroshima Univ, Grad Sch Engn, 1-4-1 Kagamiyama, Higashihiroshima 7398527, Japan
关键词
Ground source heat pump systems; Cooling-dominant regions; Borehole-type ground heat exchangers; Operational management; Variable temperature penalty; THERMAL PERFORMANCE; EXCHANGERS; OPTIMIZATION; ARRANGEMENT; TEMPERATURE; IMBALANCE; DESIGN; MODEL;
D O I
10.1016/j.renene.2018.04.065
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 degrees 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. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:182 / 194
页数:13
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