A thin walled double pipe counter flow heat exchanger is used to cool oil (cp 2 20 kJ kg middot deg C) from 150 to 40 deg C at a rate of 2 kg s by water (cp 4 18 kJ kg middot deg C) that enters at 22oC at a rate of 1 5 kg s Determine the rate of heat transfer in the heat exchanger and the exit temperature of water Hot oil 2 kg s 150 c Cold waler 1 5 kg s 22 C 40 C FIGURE P5 78

Question: A thin-walled double-pipe counter-flow heat exchanger is used to cool oil (cp = 2.20 kJ/kg·°C) from 150 to 40°C at a rate of 2 kg/s

A thin-walled double-pipe counter-flow heat exchanger is used to cool oil (cp = 2.20 kJ/kg·°C) from 150 to 40°C at a rate of 2 kg/s by water (cp = 4.18 kJ/kg·°C) that enters at 22oC at a rate of 1.5 kg/s. Determine the rate of heat transfer in the heat exchanger and the exit temperature of water.

Hot oil 2 kg/s |150 c Cold waler 1.5 kg/s 22 C 40 C FIGURE P5-78

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