In counter flow heat exchangers
A. Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
B. Both the fluids at inlet are in their hottest state
C. Both the fluids at exit are in their hottest state
D. One fluid is in hottest state and other in coldest state at inlet
Answer: Option B
Solution(By Examveda Team)
A counter-flow heat exchanger is one in which the direction of the flow of one of the working fluids is opposite to the direction to the flow of the other fluid. In a parallel flow exchanger, both fluids in the heat exchanger flow in the same direction.Join The Discussion
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If the direction of the flow is opposite that mean the inlet of the two different fluids will be different I.e one with hottest fluid will have the hottest at inlet and the coolest fluid will be at the inlet opposite to the other. So my doubt is how come both the fluids at the inlet are in their hottest state.
D should be the corect option