The Research Of Geothermal Combined With Gas Absorption Heat Pump Heating System

In modern society, the problem of energy crisis and environmental pollution isbecoming worse and worse. Geothermal energy, with the clean and sustainableadvantage is being widely used around the world. The tailrace temperature of mid-lowtemperature geothermal water applied in geothermal heating is high. The directemission will cause the extremely low geothermal utilization and enormous energywaste. According to Binhai Petroleum Village heating project, for the purpose ofeconomy、energy conservation and environmental protection, the combined heating ofgeothermal energy and gas absorption heat pump are studied in this paper.First, this paper introduces the heating status and energy situation of this project,determines that the auxiliary heat source is needed to heat in auxiliary on thecondition that the geothermal energy serves as the main heat source. According to thelocal resource conditions, three auxiliary heat sources are proposed,they areabsorption heat pump、gas boiler and compression heat pump.Second, this paper establishes the parameter models of lithium bromide andsingle-effect absorption heat pump, adopts the method of computer programming tosolve the models, analyzes the relationships between the COP of heat pump unit andthe internal temperature parameters. And then it determines the heat mode of quantityadjustment at the beginning and end of heating and the heat mode of qualityadjustment in the middle and cold winter period of heating in the area accordancewith performance curve from simulation.This paper uses TRNSYS to simulate the energy consumption situation of eachscheme, and establishes the comprehensive evaluation index system. This paperevaluates its economy by annual cost considering the time value of money, its energysaving ability by annual primary energy consumption, its environmental protectionproperty by the total value of environmental impact assessment based on the analytichierarchy process. It is concluded that three schemes have advantages than before.Finally, this paper sets up comprehensive evaluation index, introduces thesubjective and objective weighting factor based on the comparison of gas boiler. Bymaking subjective and objective variable weight comprehensive evaluation for thethree schemes, it shows that the absorption heat pump scheme comprehensive evaluation index is0.217, the gas boiler index is0.337, the compression heat pumpindex is0.317. So the absorption heat pump is the best reform project of heat source.