Which of the following statements about two-phase heat exchangers are correct?
Statement 1: Two-phase heat exchangers undergo phase change during the heat transfer process.
Statement 2: It is used mainly in water-to-water heat transfer applications.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: a
Explanation: Two-phase heat exchangers undergo phase change during the heat transfer process. The phase change occurs in either or both the fluids thus resulting in liquid to gas or gas to liquid change. The two-phase heat exchangers includecondensers, boilers and evaporators.