The Running Characteristic Experimental Of Solar Energy-Ground Source Heat Pump System

Since this century, energy crisis and environmental pollution problems increasingly become two huge obstacles on the development road of every country in the world, developing green renewable energy becomes more and more pressing needs. Solar and shallow geothermal energy as a new type of green energy, base on its efficient in winter heating the building, it has become the focus of the current global research and development. Solar and shallow layer of geothermal energy has its unique advantages. But have their own flaws when be used alone, to resolve this problem, in this article, ground-source heat pumps and solar thermal systems will be discussed, clarified the structure and working principle of heat pipe vacuum tube solar collector and ground-source heat pump, combine the advantages and disadvantages of them, formulated solar heating system coupled with the ground source heat pump system using solar-ground source heat pump system plan, so that it not only overcome the intermittent of solar energy,but also can relieve the pressure of the recovery of soil temperature field, it will get good effect on energy saving and environmental protection.This paper firstly reconstruction the ground-source heat pump system from the original test-bed of Dalian University of technology, join the solar system, to form the solar-ground source heat pump system test-bed. And make two bench experiments on the new joint conducted system.To explore the performance and operating results of the ground source heat pump system when its run alone, and also to set referential for the joint system experiments, the part I of the experiment design as a separate winter heating test by ground-source heat pump system. Analysis of laboratory test results, defined the operational performance of ground source heat pump system, and through this experiment, mastered the change of soil temperature field of underground and recovery characteristics, thus proposed the concept of "steady recovery time".On this basis, to make more in-depth research on solar-ground source heat pump system operating characteristics, the part II experiment design as study on joint system in series and parallel operation mode. By comparison and analysis of experimental results of the4groups conditions, established parallel operation mode is the optimized operation for the joint system. On this basis, through further discussion on the problem of energy load distribution within the joint system, find that increasing the solar collector side fluids are available from many-sided to enhance performance of solar-ground source heat pump system. By comparing the two-part experiment, proves the united heat pump system is markedly elevated in the unit performance after joining the solar, as well as has a positive role in promoting the recovery rate increase of the underground soil temperature field.