Study On The Suitability Of Ground Source Heat Pump For Residential Building In Chongqing Area

As a representative city in areas with hot summers and cold winters,Chongqing has relatively harsh climatic conditions.For local residents,there is a strong demand for heating and cooling.On the other hand,domestic energy problems are becoming increasingly prominent.How to meet the energy demand of residents in hot summer and cold winter areas in winter and summer while reducing energy consumption and the use of renewable energy as much as possible should be an important task under the goal of energy conservation and emission reduction.Buried ground source heat pump technology uses shallow geothermal energy for heating and cooling,which is more efficient and environmentally friendly than traditional energy supply methods,and has been widely used in various public buildings.However,the load characteristics of residential buildings are quite different from those of public buildings.It is worth discussing whether it is feasible to use underground ground-source heat pumps for centralized energy supply in residential communities.Based on the above background,this paper studies the suitability of using underground ground-source heat pumps for centralized energy supply in residential buildings in Chongqing:This paper firstly determines the evaluation index for comparison of energy supply schemes through literature research,and builds an evaluation system for the cold and heat source schemes of residential buildings.Questionnaire surveys were conducted on people from different perspectives,so as to determine the subjective weight of each evaluation index under different perspectives.In the selection of evaluation indicators,three firstlevel indicators are used: economic indicators,environmental indicators,and technical indicators.The weights under different perspectives are different.Among them,economic indicators are more important from the user’s perspective and the developer’s perspective,and environmental indicators are more important from the social perspective.On the other hand,load simulation,thermal response test,equipment selection,and energy consumption simulation were carried out in sequence for the target plots intended to use underground ground-source heat pumps for centralized energy supply.The results show that the load characteristics of residential buildings are quite different from those of ordinary public buildings,showing strong unevenness.To ensure the stable operation of the system,system design and control strategies must be adjusted relative to public buildings.Then,using a multi-view comprehensive evaluation system,the decentralized energy supply scheme and the traditional chiller + gas boiler scheme were compared with the underground ground source heat pump scheme.The evaluation results show that the optimal schemes from different perspectives are different,and the underground pipe ground source heat pump scheme has mutual advantages over the decentralized scheme.For this community,the suitability of the underground ground source heat pump needs to meet a certain occupancy rate from the perspective of users and society.From the perspective of users,the occupancy rate must be not less than 70%;from the perspective of society,the occupancy rate must not be less than 70%.Less than 50%.From the developer’s perspective,the optimal solution is always a decentralized energy supply solution with secondary energy efficiency.Finally,according to the results of comparative evaluation and analysis,the influencing factors for determining suitability are occupancy rate,building area,floor area ratio,and winter energy use.The index for evaluating whether it is applicable is the annual operating cost.Orthogonal experiments are also designed to clarify the applicable scope of underground pipe technology applied to residential buildings,that is,a certain building area and floor area ratio must be guaranteed under different energy usage habits.If the operation is intermittent in winter,the minimum occupancy rate is not low.At 50%,the minimum building area is 500,000 square meters at this time;if the winter is continuous operation,the minimum occupancy rate is not less than 40%,and the minimum building area at this time is 420,000 square meters.