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GeothermalSolns - Design of Alternative Energy Systems...

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1 ME 417 Design of Alternative Energy Systems Geothermal Problem Solutions 1. A hot geothermal source has a hot water at 65 ° C with a flow rate of 0.05 kg/s. Determine the flow rate of R-134a that can be boiled by this source. Solution: An energy balance on the boiler gives ) T - (T c m h m out w, in w, w P, w R134a fg, R134a ° ° = In order to use this equation, we must determine the operating temperature of the boiler. With the hot water entering at 65 ° C, we will choose 60 ° C as the boiler temperature. Then going to the sR-134a table we have h fg,R134a = 113.52 kJ/kg and T w,out = 60 ° C. Then kg/s 0.00925 2) 60)/(113.5 - )(65 (0.05)(4.2 )/h T - (T c m m R134a fg, out w, in w, w P, w R134a = = = ° ° 2. A vapor compression refrigeration system operating between –8 ° C and 30 ° C is to be replaced with an underground cooling loop. Both systems are to supply a cooling load of 2 kW and 75 cooling days. Determine the break even capital cost for the underground cooling loop for an interest rate of 12%, a lifetime of 25 years, and an electricity cost of 0.07 $/kWh.
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