Simulation Of A Ground Source Heat Pump System In Beijing Based On TRNSYS

Protecting the environment and developing new energy have become the subject of social development.As one of the new energy sources,geothermal energy shows a unique superiority due to its abundant resources and small environmental impact.Among them,the high efficiency,small geographical restrictions of geothermal heat pump technology make it popularity,it has been widely promoted and used.In practical applications,the flow rate of the heat pump unit and the temperature of the soil directly affect the performance of the system;the article takes a ground-source heat pump system in Beijing as the research object,and mainly optimize the flow range at the unit;ansys the impact on the average soil temperature during long-term operation,to evaluate the operation of the system.The original formation temperature in Beijing is calculated.Considering the influence of the annual cycle,the value of original formation temperature is 14-15°C within the range of 0-70m;At the same time,it was 14.3°C measured on site by the thermal response test in Changping,the calculated value is consistent with the measured value.The system's simulation model is established by TRNSYS software.Through input the detailed building parameters,the year-by-hour load is calculated.The cumulative load ratio in summer/winter is 1.12.To tested the model by comparing the simulated and measured temperature difference between inlet and outlet on the source and load side of the heat pump unit during one year operation;based on the distribution of the load,the flow rate is optimized,comparing the inlet and outlet temperatures of the buried pipe at 300-540 h in winter and 4024-4264 h in summer,the energy consumption of the heat pump unit,and COP of the system;by comparison,after optimizing the flow,it is more beneficial to the system.Analysis the change of the average formation temperature when the system operate on original design condition and improved operating condition for 10 years and 20 years,temperature increases firstly and then keep stable,it impact less on the average formation temperature on improved operating condition,and more conducive to the operation of the system.