Which of the following statements about Printed circuit heat exchanger are correct?
Statement 1: Printed circuit heat exchanger is an example for direct heat exchanger.
Statement 2: It has high heat transfer surface area per unit volume of the exchanger.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: c
Explanation: Printed circuit heat exchanger is an example for indirect heat exchanger. It can be used as alternatives to shell and tube heat exchanger. It has high heat transfer surface area per unit volume of the exchanger. It also reduces the energy requirement. But it is expensive than shell and tube units and the fluid needs to be extremely clean or else blockages can occur due to the fine channels. Therefore the fluids are filtered before the feeding into inlet pipe.