NTU Example Problem - Double Pipe CounterFlow Heat Exchanger
Effectiveness NTU Method is used to find exit temperatures in a double pipe counter flow heat exchanger. You'll learn how to find Heat Capacity Rate, Heat Capacity Ratio, Heat Transfer Effectiveness, and NTU net thermal units.
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• Heat Transfer
CHAPTERS
0:00 When to use NTU method?
2:46 Maximum rate of heat transfer
4:57 Heat Capacity Rate equation
7:05 NTU Equation
10:46 Heat Capacity Ratio equation
11:40 Counterflow Heat Exchanger Effectiveness
13:32 Find Heat Exchanger Exit Temperatures
16:16 Find Fouling Factor
Hot water (cph = 4188 J/kg K) with a mass flow rate of 2.5 kg/s at 100 C enters a thin-walled concentric tube counterflow heat exchanger with a surface area of 23 m2 and an overall heat transfer coefficient of 1000 W/m2K. … Determine (a) the heat transfer rate for the heat exchanger and (b) the outlet temperatures of the cold and hot fluids. … determine c the fouling factor that caused the reduction in the overall heat transfer coefficient.