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Unformatted text preview: as a result of taking daily showers.
7–110 Steam is to be condensed in the condenser of a steam
power plant at a temperature of 50°C with cooling water from
a nearby lake, which enters the tubes of the condenser at 18°C
at a rate of 101 kg/s and leaves at 27°C. Assuming the condenser to be perfectly insulated, determine (a) the rate of condensation of the steam and (b) the rate of entropy generation in
the condenser. Answers: (a) 1.595 kg/s, (b) 1.10 kW/K
7–111 A well-insulated heat exchanger is to heat water
(Cp 4.18 kJ/kg · °C) from 25°C to 60°C at a rate of 0.50 kg/s.
The heating is to be accomplished by geothermal water
(Cp 4.31 kJ/kg · °C) available at 140°C at a mass flow rate of
0.75 kg/s. Determine (a) the rate of heat transfer and (b) the
rate of entropy generation in the heat exchanger.
25°C 45°C by hot water (Cp 4.19 kJ/kg · °C) that enters at 100°C
at a rate of 3 kg/s. Determine (a) the rate of heat transfer and
(b) the rate of entropy generation in the heat exch...
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This document was uploaded on 11/28/2012.
- Spring '09