Plate heat exchanger NTU method effectiveness

[ram33]

Hi All

I need to do an evaluation of a pilot plant heat exchanger that we have installed and see if it would be better suited than our current bigger installations. I was trying to calculate the effectiveness of the heat exchanger but I keep on getting 1 with the NTU method. Below is the information that I have so any suggestions on how to do this would be greatly appreciated. It is a counter flow plate heat exchanger.

Steam pressure in = 120 kPa
Steam Temperature in = 400 C
Other fluid temperature in = 110 C
Steam flow in = 0.278 kg/s
Other fluid flow in = 1.806 kg/s
Heat Transfer Coefficient = 2.5 [kw/(m^2 C)] (Calculated when the trail was done).
Contact Area = 40 m^2
Steam heat capacity = 2.07 kJ/kg K
Other fluid heat capacity = 3.91 kJ/kg K

The steam comes out as condensate.

I would appreciate your help.

 

[Chestermiller]

Hi All

I need to do an evaluation of a pilot plant heat exchanger that we have installed and see if it would be better suited than our current bigger installations. I was trying to calculate the effectiveness of the heat exchanger but I keep on getting 1 with the NTU method. Below is the information that I have so any suggestions on how to do this would be greatly appreciated. It is a counter flow plate heat exchanger.

Steam pressure in = 120 kPa
Steam Temperature in = 400 C
Other fluid temperature in = 110 C
Steam flow in = 0.278 kg/s
Other fluid flow in = 1.806 kg/s
Heat Transfer Coefficient = 2.5 [kw/(m^2 C)] (Calculated when the trail was done).
Contact Area = 40 m^2
Steam heat capacity = 2.07 kJ/kg K
Other fluid heat capacity = 3.91 kJ/kg K

The steam comes out as condensate.

I would appreciate your help.

Please show us the details of your analysis.