Application And Discussion Of Deep Level Geothermal Water Resource In The HVAC Engineering Field

Energy is the power to promote the rapid development of the socio-economic, energy's sustainable development and utilization is the important material basis and safeguard of socio-economy, population, resources, and environment coordinated development. Geothermal energy as a clean energy, has irreplaceable advantages:first is abundant; second, as long as uses reasonably, there'll be no environmental pollution; the three-phase for the solar and wind energy, geothermal energy exploitation cost is relatively low.In view of the domestic and foreign energy resources' tense situation as well as present various problems which exist in the process of the geothermal direct use, in order to exploit and utilize the deep level geothermal resource more reasonably, this paper proposes the application and discussion of the U-tube downhole heat exchanger in the exploitation and utilization of deep level geothermal resources, intend to explore new ways of the deep level geothermic water's exploitation and utilization, and provide some reference for the coming research.This article mainly has the following several aspect researchs:1) Establishing the mathematical model of heat exchanger, and finding out the factors which influence the efficiency of heat exchanger, thus provide reference to improve the performance of heat exchanger and increase the efficiency of heat transfer. After calculation, we can draw the conclusion that the heat output of the heat exchanger will be increased if we increase the flow of the circulating water or reduce the temperature of the return water. The length of the heat exchanger also has influence on the heat output and the temperature of the supply water, the longer the heat exchanger, the higher the supply water temperature, and the heat output power is also bigger, but when the length increases to a certain degree, the temperature of the supply water and the heat output power increase slow; at the same time, the initial cost of the system will be also added if increase the length of the heat exchanger, so the length of the heat exchanger should be chosen reasonably according to the technology and the economic of the actual engineering.2) Analyzing the utilization of the absorption heat transformer in process of exploiting geothermal resource. The absorption heat transformer can produce the high temperature hot water using the low-grade heat source, the energy saving result is apparent. The heat source of this paper is the low temperature return geothermal water which temperature is 50℃, the performance of the absorption heat transformer in the utilization of the geothermal resource and the influential factor is discussed. The result and discussion show that, at the same temperature of the return geothermal water, the system COP and each heat exchanger's heating load are both increase gradually with temperature decreasing of the condenser inlet water; at the same cooling water temperature, the system COP and each heat exchanger's heating load are both increase gradually with temperature increasing of the geothermal return water.3) Analyzing the operation of the downhole heat exchanger heating system with peaking load heat pump, compared with the common geothermal heating system, the heating area has a very big enhancement with the peaking load heat pump.Annual cost method is used for the economic analysis of the downhole heat exchanger heating system with peaking load heat pump, and compared with several other traditional heating systems. Concluded that although the initial cost of the downhole heat exchanger heating system with peaking load heat pump is high, the operating charges is lower, so this system has competitiveness for comprehensive comparison.4) Investigating the utilize situation of the geothermal resource in Shanghe county Shandong province, and analysing the problem exist in the utilization. Aiming at the exist problems, put forward a new geothermal comprehensive utilization system, which solves the problem exist in the utilization of the geothermal resource effectively and reduces the waste of geothermal water.