Study On Energy Characteristics Of Pressurized Water Supply System In Ground Source Heat Pump System With Student Apartment

As a new type of heating water system,heat pump hot water system plays an increasingly important role in the field of modern central hot water supply with its advantages of energy saving,environmental protection and high energy utilization.In this paper,a 24-hour pressurized water supply ground source heat pump hot water system of a student apartment in Nanning is taken as the research object to carry out experimental research,theoretical analysis and simulation calculation(1)The hot water supply and demand matching of the ground source heat pump hot water project are analyzed,and the applicability and practicability of the hot water system are evaluated.(2)By monitoring the experimental data of the ground source heat pump hot water system in several different operation cycles,the variation law of the user’s load demand in the daily cycle(24 hours a day)and the variation of the basic operation parameters of the ground source heat pump hot water system with the user’s load demand in the daily cycle are summarized.(3)The results show that compared with the open water tank,the application of pressurized water tank in the building is more energy-saving,the daily cycle energy consumption can be reduced by 34.8k Wh,and the annual water supply energy consumption can be saved by 11484 k Wh.(4)TRNSYS is used as the platform to model and simulate the ground source heat pump hot water system,and the annual operation data,energy consumption change and energy loss along the pipeline of the system are obtained.The results show that the total heating capacity of the ground source heat pump unit is 427986.23 k Wh,the total consumption output of the user is 341233.71 k Wh,and the heat dissipation due to the operation of the system is 86753.48 k Wh,The heat loss of water tank and pipeline accounts for about 21% of the total heating capacity of the system.(5)The neural network is used to establish the mapping model between the unit operation parameters and the cop of the unit operation.Through the model,combined with the 24-hour load variation law of the user end,the unit operation strategy and the matching buried pipe group operation strategy under three different working conditions of summer,winter and transition season are proposed.Compared with the original daily cycle energy consumption,the improved operation strategy can reduce19.9% in summer,7% in winter and 12.3% in transition season.The results show that the energy consumption of ground heat pump is reduced by 7.5% in summer and10.1% in winter.