A counter flow heat exchanger is being used to cool a flow of cyclohexane from 110°C to 62°C. The cyclohexane enters the heat exchanger at a flow rate of 14 L/s.
The cyclohexane is cooled by water entering the heat exchanger at 48°C with a flow rate of 10 L/s. Determine,

a. The outlet temperature of the water

b. The pinch point temperature difference and its location (hot or cold end)

c. The effectiveness of the heat exchanger

d. The exergetic efficiency of the heat exchanger if the dead state temperature is 20°C The effectiveness of a counter flow heat exchanger is related to the heat transfer surface area by the following relationship,

e. Determine the UA product for this heat exchanger (kW/K)

Transcribed Image Text:

UA 1-exp Cmin E min min 1- (Cum exp-UA (1-Com) Cmax Cmin Cmax 1-min Cmax