Question

A two-fluid heat exchanger has inlet and outlet temperatures of 65 and 40 degree C for the hot fluid and 15 and 30 degree C for the cold fluid. Can you tell whether this exchanger is operating under counterflow or parallel-flow conditions? Determine the effectiveness of the heat exchanger.

Answer 1

Answer:

 Parallel flow

$\epsilon =0.5$

Explanation:

Given that

For hot fluid

Inlet temperature=65 C

Outlet temperature=40 C

For cold fluid

Inlet temperature=15 C

Outlet temperature=30 C

Here is only temperature is given and did not provide the information about heat capacity of fluids so by only seeing temperature we can not predict the types of heat exchanger. But there is not too much difference in temperature of exits fluids so we can say that this is parallel flow heat exchanger.  

Effectiveness of heat exchanger given as

$\epsilon =\dfrac{\Delta T}{\Delta T_{max}}$

$\epsilon =\dfrac{65-40}{65-15}$

 $\epsilon =0.5$