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The wash still in a whisky distillery uses mechanical vapour re-compression as shown in the simplified diagram of the Figure shown below. The vapour from the still is at 80° C. Take a minimum temperature difference between the vapour leaving the still and the steam in the heat exchanger of about 20 K, and a minimum temperature difference between the steam in the coil and the liquid in the still also of about 20 K. Assuming a compressor isentropic efficiency of 0.65, and a combined mechanical and electrical transmission efficiency for the compressor motor of 0.9, choose suitable pressures for the steam circuit and calculate the COP of the heat pump.
an electric power plant uses solid waste for fuel in the production of electricity. the cost y in dollars per hour to
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1. steam is contained in a closed rigid container with a volume of 1 m3. initially the pressure and temperature of the
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