Research On The Application Of Solar Energy And Ground Source Heat Pump Combined Energy System In Building Energy Saving

In order to improve the utilization of renewable resources and to improve the energy efficiency ratio of ground source heat pump system, a variety of solar ground source heat pump system is proposed. In this paper, we simulate and analyze the different form of hybrid ground-source heat pump systems based on the building model of an office building in Ji’nan, the different forms of equipment parameters, operation mode and energy saving effect are discussed too.We use TRNSYS platform to model and simulate the hourly load of the air conditioning system of an office building which is seated in Jinan, Shandong Province. And the maximum heat load is 341.6Kw, the maximum cooling load is 425.94Kw.We found that the design of the load index of the intermittent operation of the system is 20-30% more than the all day operating one by the earlier simulation of different operating time. The single ground source heat pump system is designed based on the earlier simulation. Analysis the mathematical model of the relevant components in TRNSYS. The system 8760 hours hourly simulation data were analyzed, through the analysis: analysis of buried pipe exchanger side return water temperature to judge whether to meet the needs of the system, the calculated winter COP of the unit is maintained at around 4, summer between 6-7.5, annual system energy efficiency ratio is 3.23.Mathematical model of various components in the solar system are analyzed in theory. The connecting way and area of solar collectors, and the parameters of the water pump and water tank capacity is determined. Inclination and azimuth of collector is optimized by the Hooke-Jeeves optimal algorithm, the solar collector in Jinan area optimized Angle is 55.0625 ° in the winter day, and the azimuth Angle is 2.125 °.Based the research of above,we design and analyses the two series forms of solar ground source heat pump.Through the simulation calculation:the annual energy efficiency ratio of the collector series first system is 3.23, for the whole year increase 2.84% than single ground source heat pump system; the annual energy efficiency ratio of the buried tube collectors first system is 3.335, for the whole year increase0.439% than the collector series first system. Analysis found that when the weather is better outside, solar energy hot water injection to the soil, on the contrary, the temperature of solar energy hot water is low, so it is difficult to thus to enhance the performance of series systems.Problems based on the series model, this paper of solar ground source heat pump composite alternating system were theoretical analysis, determined the solar system pump the control parameters and logic of when to start and stop, analyze the alternately control points. The alternating system model was built through the TRNSYS platform. It turned out that when the tank is 50m3 and heat exchanger area is 550 m2, the annual energy efficiency ratio of the system is 3.89, which is 20.43% more than the single ground source heat pump system annual energy efficiency ratio. The analysis shows that the energy efficiency ratio of the composite system is higher than that of the series system. The average temperature of soil rises 10℃ when the complex alternative system runs for decade.The ground temperature can be maintained within a fluctuation range of 14-18℃ by the way of connecting the underground pipes with cooling tower in the transitional season.Through the theoretical analysis and system simulation, it has a certain reference to the practical engineering application.