Cold water (cp = 4.18 kj/kg⋅°c) leading to a shower enters a well-insulated, thin-walled, double-pipe, counterflow heat exchanger at 10°c at a rate of 0.95 kg/s and is heated to 70°c by hot water (cp = 4.19 kj/kg⋅°c) that enters at 85°c at a rate of 1.6 kg/s. determine (a) the rate of heat transfer and (b) the rate of entropy generation in the heat exchanger.
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Ответ:
(a) The rate of heat transfer is 238.26 kW.
(b) Rate of entropy generation is 0.063 kW/K.
Explanation:
(a) Taking the heat gained by the cold water into consideration,
Q = (0.95 kg/s)(4.18 kJ/kg.⁰C)(70-10) = 238.26 kW.
(b) Entropy generation = entropy in cold water + entropy in hot water
But
∴ = (0.95)(4.18)(ln(343/283)) + (1.6)(4.19)(ln(1- (238.26/((1.6)(4.19)(358))))
= 0.7636 + (- 0.7009) = 0.0627 kW/K.
Ответ:
A
Explanation:
it would start as a low population which is smaller than get larger