| Ground source heat pump as a green energy technology, the soil and groundwater are no pollution, the system is relatively simple, can effect comparing higher renewable energy in today has become the important heating and cooling technology. Therefore, vigorously developing ground source heat pump technology research and application promotion, especially for the influence factors of ground source heat pump heat transfer performance of accurate analysis and study, can choose suitable for different environmental factors of ground source heat pump system, to reduce the energy consumption in our country, reduce the pollution to the environment has important significance.Ground source is not only a kind of clean energy, but can be recycled, abundant reserves, no damage to the environment. In today’s environment problem and energy problem more and more get the attention of the public, almost become the bottleneck of the social development at present stage, so the development of clean and renewable energy is the key of the current energy application problems, using the soil source on the one hand can reduce environmental pollution, on the other hand, because the soil source huge reserves, can form a new way of energy supply, so it has a broad development in the future.For whether civil or commercial buildings used mostly for intermittent use of soil source heat pump, the intermittent operation of the soil source heat pump can not only save energy, but also is beneficial to the heat transfer effect of soil source heat pump, carry on the simulation and analysis can be intuitive understanding of the intermittent operation of the soil temperature field of soil source heat pump, heat medium temperature change, convenient heat pump design.Soil source heat pump as a kind of ground source heat pump, compared with the water source heat pump has not been applied widely, but in recent years, under the government’s vigorously support, soil source heat pump is developing rapidly, and gradually accepted by people, the application of soil source heat pump into a geometric growth.In this paper, on the basis of the existing soil source heat pump, heat pump were analyzed in the actual operation of various influencing factors. Such as intermittent operation, have water seepage in the soil, and so on.Based on soil source heat pump buried underground vertical u-shaped tube, established the mathematical model of unsteady temperature field of the soil around, to find the solution by using FLUENT software. Through the simulation of winter and summer cooling conditions, the soil temperature field around the buried pipes heat pump intermittent operation, the change rule of different rock and soil water content on soil temperature field around underground heat exchanger, the effect of different soil around the buried pipe seepage velocity affect the performance of the underground heat exchanger, for long run efficiently ground-source heat pump system provides a theoretical reference.Simulation results show that with the continuous operation of heat pump, buried pipe radius gradually expanding, the soil temperature field around a long time after the operation, the soil heat action radius of about 3.5 m, continue to run a little change, and the thermal efficiency is low. And intermittent operation can not only save energy waste when not needed, and can make the soil temperature, increase thermal efficiency. In this paper, based on both the practical application of complex soil source heat pump, compares the intermittent operation with conventional continuous operation in thermal efficiency, for the actual ground source heat pump engineering theory as the basis. |
