Page 233 - Low Temperature Energy Systems with Applications of Renewable Energy
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220                 Low-Temperature Energy Systems with Applications of Renewable Energy

         h     enthalpy
         s     entropy
         T     temperature
         V     volume
         W _   power



         Greek letters

         h     efficiency
         s c   carnot factor
         x     exergetic weight
         c     exergy analysis



         Subscripts

         BWSWD      Boise Warm Springs Water District
         C          condenser
         CB         City of Boise
         COP        coefficient of performance
         CM         compressor
         EM         electric motor
         HPU        heat pump unit
         SICH       State of Idaho Capital Mall
         SC         subcooler
         EC         economizer
         TV         throttle valve
         IC         intercooler
         EV         evaporator
         P          pump
         HS         heating system
         RH         regenerative heat exchanger
         WPS        water purification system



         Review questions



          1. If the waste brine from a geothermal power plant is 120 C and the lowest temperature
             allowable during cooling to prevent scaling is 40 C, list and briefly describe the possible

             direct heat uses that might be made with the brine.
          2. Describe the role of legends and myths of ancient peoples in exploration activities for
             geothermal prospects.
          3. The hot springs at Chaudes-Aigues in France have been known for millennia. Their
             longevity and constancy make them scientific and technical curiosities. Write a short essay
             discussing their origins and what conditions have led to their very long life.
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