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CO-NDENSER TYPE Air-cooled Evaporative Water-cooled EQUIPMENT COST (DOLLARS=*F/BTU/HR) 0.50 0.25 0.05 The water-cooled condenser option is by far the most economical; however,verylargequantitiesofwaterarerequired. Thecool- ing water flow rate is defined as follows: For the sample engine shown in Figure 31, a cooling water flow of 317 GPM would be required for a water temperature of 70°F. Assuming a 100 ft. head for transport of the cooling water to the condenser and SO percent pump/motor efficiency, the power required for the circulation pump would be: 26.5 For an air-cooled condenser, the power required to drive the cooling fan as a function of the heat rejection load and the differential between condensing steam and ambient temperature is as fallows: E=c 6900 (AT) For the sample engine shown in Figure 31, the fan power consump- tion would be 36.8 KW for an 85'F ambient. This results in a loss factor of 0.963 on the steam Rankine cycle efficiency. For a water-cooled condenser, this factor would only be 0.988. The penalty factor for an evaporative cooling system would fall some- wherebetweenthetwoabovevalues. Priortothestartofthe study, however, a decision was made not to evaluate cooling tower performance AUXILIARIES Other PCS power consumers have been grouped into a category labeled"PCSAuxiliaryPower." Theestimatedpowerconsumptionas a function of the overall power output of items in this category would be the following: . 19 -PDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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