|Table of Contents|

Research on Influence of Operation Mode on Geothermal Field Efficiency of Groundwater Heat Pump(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
284-292
Research Field:
基础工程
Publishing date:

Info

Title:
Research on Influence of Operation Mode on Geothermal Field Efficiency of Groundwater Heat Pump
Author(s):
ZHOU Nian-qing1;  KONG Ling-xi1;  WANG Xiao-qing2;  WANG Yang2
(1. Department of Hydraulic Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Engineering and Technology Research Center of Shallow Geothermal Energy, Shanghai 200072, China)
Keywords:
groundwater heat pump;  coupled thermal conduction and groundwater seepage;  geothermal field;  heat transfixion;  operation mode
PACS:
TK521
DOI:
10.19815/j.jace.2021.09126
Abstract:
Based on a groundwater heat pump project in Shanghai, a 2D simplified coupled thermal conduction and groundwater seepage numerical model was established to simulate the heat transport process of porous media in the production aquifer by means of finite element analysis tool COMSOL Multiphysics, and the field monitoring data of heat pump operation for 3 years were used to identify and verify the model. The efficiency influenced by cooling/heating load design and pumping/injection mode of heat pump system were discussed on geothermal field under different working conditions in production area, the evolution characteristics of geothermal field during operation of heat pump were predicted and analyzed, and finally the operating effect of the system was evaluated. The results show that when the heat pump system is running according to the original design scheme, the pumping and injection wells have a good short-term operation effect, but the heat transfixion phenomenon will occur at the end of the 7th heating period, which means that long-term operation will not be conducive to the heat production of hot wells. If 20% heating load is reduced and 20% cooling load is increased, the diffusion velocity of cold affected zone is reduced 46.3%, the operation effect of the system is significantly improved, and heat transfixion phenomenon will not occur within nine simulated operating cycles, which indicates that reasonable adjustment of the cooling and heating load is beneficial to long-term stable operation of heat pump system. When the cooling load and heating load is constant, the diffusion velocity of cold affected zone decreases by 9.3% and 15.7% respectively when the circulating water flow decreases by 10% and 20% respectively, the heat transfixion phenomenon is effectively alleviated, and it can still meet the needs of the project for refrigeration and heating. It is further clarified that the pumping and irrigation mode of large temperature difference and small flow should be adopted in the groundwater source heat pump system.

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Last Update: 2022-09-30