Question

What type of heat exchanger is used in cryogenic applications?

(a) Shell and tube Heat exchanger

(b) Plate heat exchanger

(c) Finned tube heat exchanger

(d) Plate fin heat exchanger

The question was posed to me in an international level competition.

My enquiry is from Heat Transfer Applications in portion Heat Transfer Applications of Food Processing Unit Operations

Answer 1

Correct choice is (d) Plate fin heat exchanger

To explain: Plate fin heat exchangeris used in cryogenic applications. They use corrugated fins which are separated by flat plates. These are used in gas-to-gas applications at where it has low pressures and temperatures not above 800°C.