Study On Determination Of Operation Energy Efficiency Index Of Underground Water Source Heat Pump System In Shaanxi Province

As an energy-saving,environment-friendly heating and cooling technology,groundwater source heat pump(GWSHP)has been widely used in the HVAC field in recent years.However,a large amount of test data shows that the actual GWSHP system is inefficient compared with the design value,so that the advantages of this technology have not been fully utilized.The research shows that the operational energy efficiency of the actual GWSHP system is related to the system configuration,operation strategy,management level,geographical conditions and so on.Although China has already established the relevant regulations for the operation of renewable energy systems,it has poor operability for implementation of local indicators,and it does not consider the problems of constraint index and leading index.Therefore,the study on determination method of the operational energy efficiency index of GWSHP system and obtention of constraint value and leading value of the index are a key issue to promote the promotion of this technology and guide the actual operation.Firstly,the paper conducted the field research on the actual operation of heat pump system in Shaanxi Province,and obtained the information of groundwater resource conditions,system configuration and energy-saving measures and so on,which can provide the basis for the reasonable division of system level and the conditions of system simulation.Secondly,due to the weak operability of the national standards for local implementation,the study established the energy efficiency index of GWSHP system of evaluation system based on the national standard,and adopted double indices,that is the energy consumption of unit building heating area and coefficient of performance,to evaluate the energy efficiency of the system.The index of water side of ratio of electricity consumption to transferred heat quantity EHR-h(S),the heat pumpseasonal performance factor SCOP and load side of ratio of electricity consumption to transferred heat quantity EHR-h(L)are used to evaluate the energy efficiency of water supply side transmission system,heat pump unit and load side of transmission and distribution system,respectively.Thirdly,this paper uses software TRNSYS17 to simulate the GWSHP system based on the reasonable classification of the system,obtains the constraint index and the leading index of the operational energy efficiency of the GWSHP systems with different levels in central and southern Shaanxi,that provides the reference and basis for energy-saving operation of the GWSHP system.Finally,the paper test an actual GWSHP system in Shaanxi Province,and compares the operational energy efficiency of system with the constraint index and the leading index to evaluate the energy efficiency level.At the same time,the study analyzes and summarizes the typical problems in the actual operation of the heat pump system,and then clarifies the direction to improve energy efficiency,which will guide the GWSHP system with energy-saving operation.