Research On The Operation Mode Of Solar Assisted Ground Source Heat Pump In Cold Area

The long-term operation of ground source heat pump in winter in cold area makes the average temperature of the ground drop,and the ground source heat pump system can not last for a long time.To solve this problem,a solar assisted ground source heat pump heating system is proposed in this paper.Taking Zhangjiakou as an example,the operation characteristics of the system are studied in detail.First of all,according to the low electricity price policy,the solar assisted ground source heat pump heating system is proposed,and combined with low electricity heat storage.The objective function of investment cost and operation cost of the system is proposed.Taking the 70000 square meters residential area in Zhangjiakou area as an example,the enumeration method is used to calculate and solve the problem.When the area of solar collector is 2181 square meters,the minimum total cost of the system is2253917.67 yuan.Secondly,aiming at the heat storage tank in the system,a new structure of the heat storage tank is constructed.The internal structure of the heat storage tank includes the flow stabilizer and the water baffle,and the simulation of heat storage and heating of the tank is carried out with FLUENT software.The simulation results show that there are six temperature layers in the heat storage and heating modes.Finally,it is concluded that the water storage tank can meet the heating demand of users for five hours under the condition of four hours of heat storage.Then,the operation mode simulation analysis of solar assisted ground source heat pump heating system,combined with meteorological parameters and building load,through MATLAB software programming simulation,the corresponding operation mode of each time period,selected four typical day operation mode for analysis.When the annual cost of the system is the lowest,the equipment cost is3553900 yuan,the operation cost is 1839000 yuan,and the annual cost is 2254000 yuan.Finally,the program of solar assisted ground source heat pump heating system optimization is designed.By inputting the building area,roof area,heat pump unit price,building heat index and selecting the city where the building is located,the energy equation and cost formula in Chapter 2 and Chapter 4 are used to optimize the system,and then the optimal solar collector area is obtained and the system cost is drawn Annual value function chart.