Cooling water enters the tubes at 60f at a rate of

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Unformatted text preview: 6 kJ/kg · °C) flowing at a rate of 2 kg/s from 80°C to 40°C by water (Cp 4.18 kJ/kg · °C) that enters at 20°C and leaves at 55°C. Determine (a) the rate of heat transfer and (b) the rate of entropy generation in the heat exchanger. 7–113 A well-insulated, thin-walled, double-pipe, counterflow heat exchanger is to be used to cool oil (Cp 2.20 kJ/kg · °C) from 150°C to 40°C at a rate of 2 kg/s by water (Cp 4.18 kJ/kg · °C) that enters at 22°C at a rate of 1.5 kg/s. Determine (a) the rate of heat transfer and (b) the rate of entropy generation in the heat exchanger. 7–114 Cold water (Cp 4.18 kJ/kg · °C) leading to a shower enters a well-insulated, thin-walled, double-pipe, counter-flow heat exchanger at 15°C at a rate of 0.25 kg/s and is heated to 0.25 kg/s 15°C Hot water 100°C 3 kg/s 45°C FIGURE P7–114 Cold water 7–117E Steam is to be condensed on the shell side of a heat exchanger at 90°F. Cooling water enters the tubes at 60°F at a rate of 115.3 lbm/s and leaves at 73°F. Assuming the heat exchanger to be well-insulated, determine (a) the rate of heat transfer in the...
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This document was uploaded on 11/28/2012.

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