Differences between design expectations and actual operation of ground source heat pumps for green buildings in the cold region of northern China

Jingmeng Sang, Xin Liu, Chuanzhi Liang, Guohui Feng, Zonghan Li, Xiuhui Wu and Mengmeng Song

Energy, 2022, vol. 252, issue C

Abstract: Ground source heat pump technology and green buildings have been combined. This is an effective way to improve the utilisation rate of renewable energy, increase energy savings and reduce emissions. However, some green building ground source heat pump systems have high energy consumption and poor energy-saving effects. Data was collected from the ground source heat pump systems in five typical green buildings (T1 to T5) in a cold region of China. The mechanisms of the differences between the actual operation and design expectations were explored for the ground source heat pump systems in cold regions. The results showed that the key factors affecting the efficiency of the building energy systems were the coefficient of performance (COP) and energy efficiency ratio (EER). Of buildings T1 - T5, T1, T3, and T5 experienced excessive heating, with excess heating rates of 19.4%, 18.1%, and 3.7% respectively. The difference between the expected and actual heat pump systems was illustrated by factors such as the water supply temperature at the ground source side, the water leakage at the user side and ground source side, insufficient depth of the water intake and recharge wells, and the dirt accumulation in the plate heat exchanger.

Keywords: Difference mechanism; Building energy consumption; System energy efficiency; Oversupply (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:252:y:2022:i:c:s036054422200980x

DOI: 10.1016/j.energy.2022.124077

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