Cold water (cp 4 18 kJ kg cent deg C) leading to a shower enters a well insulated, thin walled, double pipe, counter flow heat exchanger at 15 deg C at a rate of 0 25 kg s and is heated to 45 deg C by hot water (cp 4 19 kJ kg cent deg C) that enters at 100 deg C at a rate of 3 kg s Determine (a) The rate of heat transfer and (b) The rate of energy destruction in the heat exchanger Take T0 25 deg C Cold water 0 25 kg s 15C Hot water 3 kg s 100 C 45C

Question: 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

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 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 energy destruction in the heat exchanger. Take T0 = 25°C.

Cold water (cp = 4.18 kJ/kg €¢ °C)

Cold water 0.25 kg/s | 15C Hot water 3 kg/s 100 C 45C

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