Energy Saving And Economic Analysis Of Self-compensated Ground Source Heat Pump System

In the cold area,the problem of soil cold accumulation in the soil source heat pump system is difficult to solve because of the uneven heat and heat load.Therefore,by monitoring the operation data of the "self-compensated" ground-source heat pump system within five years,the energy saving and economic analysis are carried out in this paper.The purpose of this paper is to determine whether the self-compensating ground source heat pump system can solve the imbalance of soil heat and bring about good energy-saving and economic benefit at the same time.This thesis has carried on the following research: 1.Temperature variation of underground soil.2.Energy efficiency analysis of the system.3.Exergy analysis.4.Economic analysis.First,monitoring changes in soil temperature over a period of five years.Secondly,the energy efficiency analysis and exergy analysis are carried out through the data collation and analysis of the parameters in the ground-source heat pump system,and the energy saving optimization scheme is put forwar d.Finally,the research content of this paper is to evaluate the economy of ground source heat pump system,mainly from the static analysis method and the dynamic analysis method of the ground source heat pump system and the air-cooled heat pump central heating system economic comparison analysis.Research shows that: Through monitoring the deep soil temperature of 2.5m-100 m in the system,it can be seen that the temperature shift range of the soil temperature in the shallow subsurface 2.5 m depth is large,and the variation range of soil temperature decreases gradually with the increasing of the depth,and tends to stabilize slowly.Therefore,using self-compensation can effectively solve the problem of soil heat imbalance in severe cold areas.The average value of energy efficiency in summer is 2.96,the average energy efficiency in winter is 3.13,and the energy saving rate is 47.9%.It has good energy saving benefit.The analysis of the system shows that,The heat pump unit is the biggest exergy loss in the system,because the heat and cold source is at the beginning of the heat pump system,and the energy loss is more,End fan coils are also part of the overall system that can be lost,The exergy efficiency of the pipeline in heat pump system can reach more than 90%,and its loss is very small and negligible.Through the energy analysis of the system,it is found that we can improve the exergy efficiency of the unit by improving the exergy efficiency value of the unit or by selecting the efficient unit to improve the exergy efficiency of the unit,and then improve the exergy efficiency of the system.In the economic analysis of ground-source hweat pump system,it is concluded that the static investment recovery period is 4.3 years and the dynamic investment recovery period is 4.8 years.Through the research in this paper,it is found that the technology of "self-compensation" can not only effectively prevent the occurrence of underground cold accumulation,but also bring about better economic benefit of energy saving,which is an effective way.