Heat exchangers Interview Questions

Heat exchangers Interview Questions 

Blog contains

Heat transfer interview questions asked in technical Interviews explained here in easy terms.

Interview questions contain in this blog

1.  Define effectiveness of heat exchangers
2. What do you mean by heat duty of a heat exchanger?
3. Which are two parameters which are measured on site for heat exchanger to evaluate the performance?
4. What is meaning by capacity ratio in heat exchanger?
5. Find the overall heat transfer co

1. Define effectiveness of heat exchangers

Heat exchangers effectiveness can be found by

Where
to = Cold water outlet temperature
ti = Cold fluid inlet temperature
Ti = Hot water inlet temperature

2. What do you mean by heat duty of a heat exchanger?

Heat duty of a heat exchanger is define as the heat that is transferred from hot fluid to cold fluid per unit time.

3. Which are two parameters which are measured on site for heat exchanger to evaluate the performance?

1. Hot and cold fluid inlet and outlet temperatures
2. Mass flowrate of cold and hot fluids

4. What is meaning by capacity ratio in heat exchanger?

Capacity ratio is

to = Cold water outlet temperature
ti = Cold fluid inlet temperature
Ti = Hot water inlet temperature
To = Hot fluid outlet temperature

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5. find the over all heat transfer co efficient for a shell and tube counter flow heat exchanger.

Data

Heat exhausted = 11.27 GJ/ hour
Heat transfer area = 96m2
LMTD = 76°C

Heat transfer co efficient can be calculated by following equation

U = Q / ( A * LMTD )
    =  11.27 * 10 ^6 / ( 3600 * 96 * 76 )
    = 0.43 kW / m2 K