Research on a Variable Water Supply Temperature Strategy for a Ground-Source Heat Pump System Based on TRNSYS-GENOPT (TRNOPT) Optimization

Jiaqi Cao, Shiyu Zhou, Tao Wang (), Baoqi Shan and Xueping Liu
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Jiaqi Cao: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Shiyu Zhou: School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Tao Wang: 801 Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250013, China
Baoqi Shan: Ecology Institute of Shandong Academy of Sciences, Jinan 250101, China
Xueping Liu: Shandong Institute of Product Quality Inspection, Jinan 250101, China

Sustainability, 2023, vol. 15, issue 5, 1-14

Abstract: An office building located at Jinan equipped with ground-source heat pump (GSHP) system was selected as the research object. The GSHP system model was established using TRNSYS software. With the total energy consumption of the system as the objective function, several control strategies were proposed for the optimization work of water supply temperature at the load side of the heat pump unit. Firstly, a variable water temperature control strategy was adjusted according to the load ratio of the unit. In addition, the TRNSYS-GENOPT (TRNOPT) optimization module in TRNSYS was used to find the optimal water supply temperatures for different load ratios. After simulating and comparing the system’s energy consumption under the three control strategies, we found that the total annual energy consumption under the variable water supply temperature scheme is less than that under the constant water supply temperature scheme by 10,531.41 kWh. The energy saving ratio is about 5.7%. The simulation found that the total annual energy consumption under the optimized water supply temperature based on TRNOPT is lower than that under the variable water supply temperature scheme by 1072.04 kWh, and it is lower than that under the constant water supply temperature scheme by 11,603.45 kWh. The annual energy saving ratio of the system is about 6.3%. It is concluded that the optimized water supply temperature scheme based on TRNOPT has a better energy saving effect than the first two water supply temperature schemes.

Keywords: GSHP; water supply temperature; optimal control strategy; TRNOPT (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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