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mass flow rate of the working fluid can be obtained for a particular heat source. The first requirement is to know or estimate the heat source flow rate and temperature. When using geothermal brine as the heat source, the temperature of the brine only needs to be lowered to a temperature which does not allow precipitation of any dissolved solids. This needs to be confirmed by geochemical analysis of the fluids to quantify dissolved solids in the brine. Well testing should have also been done to know the approximate flow rate of the brine. Once this information is known, the temperature-heat transfer (T-q) diagram, in conjunction with an energy balance can be used to calculate the maximum flow rate of the working fluid. Equation 11 is a simplified energy balance between the working fluid and the geothermal brine. ()() (11) In Equation 11 ṁwf is the mass flow rate of the working fluid, h1 is the enthalpy of the working fluid at the turbine inlet conditions, h4 is the enthalpy of the working fluid after it exits the pump, ṁgeo is the mass flow rate of the geothermal brine, cavg is the brine’s average heat capacity over the temperature range from the hot temperature, Tx to the cold temperature Ty. Equation 11 can be solved to calculate the mass flow rate of the working fluid when the flow rate of the geothermal brine and temperatures are known. After the mass flow rate of the working fluid is known, the pinch point analysis can be performed. In the analysis, it is necessary to calculate the amount of heat energy required to increase the enthalpy of the working fluid from the conditions at the outlet of the pump to saturated liquid conditions. The percentage of heat transferred in preheating the working 32PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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