| Solar assisted heat of low temperature water source pump system is adopted for the purpose of fully utilizing the abundant solar energy and underground water resources in sitang.This system collects heat by the flat plate solar collector, stores heat by the direct contact heat storage water tank, supplies heat by the low temperature water source pump and takes the radiator as the heating ending.While heating from November to February in lasa of xizang, for the maximum collection solar energy, we can know that the optimum tilt angle of the collector is 55.21° through optimization calculation. In order to optimize the function of technical economy ,through optimization calculation ,we can know that the collector area of flat plate collector is about 49% of the heat building area, the thermal energy storage capacity of the heat storage water tank is 100L/ m~2(collector area),the guaranteeing rate of solar energy is 99.8%.Through systematic simulation using Simulink, we know that the operation of the collector pump is controlled by the solar circuit changer to control the offlet and inlet. The circular operation of collector is controlled by the 0℃ temperature differential circuit changer and the upper limit of heat collection temperature; This tank operates at the heat storage temperature between 10~ 50℃. When the underground water temperature is under 10℃, the heat supply is realized by drawing out the underground water through water source pump; the switch of the water source pump is controlled by the differential of the heat quantity stored in the tank and the heat loading of the building, combining whether the heat storage water temperature is higher than the lowest operative temperature of the heating ending. At the same time the heat resisting temperature has to be higher than 40℃. A well has to be sunk to guarantee the normal operation of the system in the gloomy weather and to meet the demand of the heat supply when the water storage temperature is under 10℃. |
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