Comparative Study On The Coupled Modes Of Solar-Ground Source Heat Pump Heating System

The combination technology of solar seasonal thermal storage and ground source heat pump technology is considered as a recognized advanced building heating technology.Solar heating systems and ground source heat pump heating systems have a variety of coupled modes and the diffirent coupled mode systems have different system cost performance,the research on the coupled modes of solar ground-source heat pump system has practical significance for the application of this system.Based on the solar seasonal storage heating technology,taking the fourth floor of Hebei University of Technology energy conservation test center as the target architecture,this paper respectively designed five kinds of the typical coupled mode systems,which are solar direct supply type,tank temperature control type,solar heating ground heat exchanger outlet type,solar energy-ground source combined type,solar cascade utilization type.And simulation models based on TRNSYS software were established,which simulated the five kinds of coupled mode systems for 20 years.Aiming at the operation performance and system economy of five kinds of coupled mode systems,a comparative analysis is made.The results of system operation performance show that the average COPs for 20 years of solar direct supply type,tank temperature control type,solar heating ground heat exchanger outlet type,solar energy-ground source combined type,solar cascade utilization type is 4.28,4.03,2.85,2.88 and 3.60.The average annual electricity consumption during the 20-year operation period is respectively 24632 kWh,26607kWh,37005 kWh,36615kWh and 29478 kWh.The economic comparative analysis respectively from the initial investment,operating cost,annual cost.The initial investments of five kinds coupled modes are not much diffirence,the initial investment of solar direct supply type,water tank temperature control type,solar heating ground heat exchanger type,solar and ground source combined type,solar cascade utilization type are 493897 yuan,507957 yuan,504137 yuan,529966 yuan and 498116 yuan.System operating costs can vary significantly due to system power consumption differences,the operating cost of solar direct supply type,water tank temperature control type,solar heating ground heat exchanger type,solar and ground source combined type,solar cascade utilization type are 12674 yuan,13689 yuan,19039 yuan,15166 yuan and 18839 yuan.The annual cost method is used to compare the five coupling modes,the annual cost of solar direct supply type,water tank temperature control type,solar heating ground heat exchanger type,solar and ground source combined type,solar cascade utilization type is 63051 yuan,65501 yuan,70461 yuan,72896 yuan and 65974 yuan.Comprehensive analysis,direct solar energy supply is the best coupled mode.Using the method of difference investment recovery period to compare the solar direct supply type solar energy-ground source heat pump heating system with the municipal heating,the difference investment recovery period of solar direct supply type solar energy-ground source heat pump heating system is determined for 5.6 years.