Author: Xu, Shiyuan
Title: Long-term performance analysis of a GSHP system in northern China
Advisors: Lu, Lin (BSE)
Degree: M.Eng.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Ground source heat pump systems
Geothermal resources -- Environmental aspects
Department: Department of Building Services Engineering
Pages: 94 pages : color illustrations
Language: English
Abstract: At present, the survey data of shallow geothermal energy in northern China is enough. Through a number of investigations and explorations on shallow geothermal energy in northern China, the distribution of shallow geothermal energy in many cities in northern China has been preliminarily mastered. However, the statistical results of development and utilization projects in recent years show that this technology lacks detailed and long-term comprehensive system operation data in the promotion and application process. Most energy efficiency analysis of ground source heat pump system only stays in the experimental research or simulation stage, and few people carry out quantitative detection, detection analysis and evaluation of energy saving and environmental protection performance of the system through field test analysis and simulation. Therefore, this study aims to provide data support for the development and utilization of shallow geothermal energy in the future, and provide real data reference for the further promotion and application of shallow geothermal energy. This research was based on the field data test analysis and simulation software TRNSYS. This study analyzed the current system energy saving, environmental protection performance and soil temperature impact. Based on the temperature difference, flow rate and power consumption between user-side and pipe-side, the system energy consumption and pollutant discharge can be estimated. The long-term operation performance of the system can be simulated by software.
The results show that compared with the conventional air-conditioning system, the standard coal consumption is reduced by 87.88t. It can save energy and reduce energy consumption. The CO₂, SO₂ and dust emissions of the GSHP system in annual operation are 7.33t, 0.059t and 13.65t respectively, indicating that the pollutant emissions are increased compared with the conventional system, the system achieves the effect of emission reduction. Software simulation results show that with the passage of time, heat output of heat pump declined by year, the total quantity of heat of the heating season decreased by 30%. In addition, the average temperature of soil around buildings is fluctuating in 13 °C, and the operation of GSHP system has an impact on the soil temperature. At present, the energy consumption of air-conditioning in buildings in China accounts for about 40-60% of the total energy consumption of all buildings. Compared with developed countries, China is in a relatively low level. Due to the signing of relevant emission reduction agreements, the Chinese government needs to improve the energy efficiency of air-conditioning, which is of great significance for reducing energy consumption and coping with climate change. The use of shallow geothermal energy, especially GSHP technology, is highly recommended. This may indicate there is a need for the government to promote the application of GSHP technology.
Rights: All rights reserved
Access: restricted access

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