A double pipe exchanger is operated for heating and cooling the following fluids:

i. acrylic acid heats from 12^o C to 44^o C using a parallel flow of naphthalene that cools from 93^o C to 52^o C.

ii. acrylic acid heats from 12^o C to 44^o C using a counter-flow of naphthalene that cools from 93^o C to 52^o C.

iii. fuel oil is heated from 30^o C to 115^o C using saturated steam at 11.71 bars in counter flow.

iv. superheated steam at 180^o C and 1.0815 bars is subcooled to 40^o C using glycerin in counterflow that heats from 10^o C to 95^o C.

v. ethyl benzene is heated from 25 to 55^o C using engine oil in counter-flow which cools from 92 to 62^o C

vi. superheated steam at 100^o C and 0.7514 bars which exits at as saturated liquid water is used to boil refrigerant R-134a at 1 atm which enters the exchanger in counter flow at -73^o C and leaves as a saturated vapor.

A. For each of these cases, draw a T-x diagram of the temperature profile through the exchanger.

B. Determine the temperature driving force for heat transfer in each of these problems. Write answers as positive numbers. 

C. For iii, iv, v and vi, would it matter if the fluids were switched from counterflow to parallel flow?

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solution 1 here we are using double pipe heat exchanger Th1hot fluid inlet temperature Th2hot fluid ... View the full answer