Performance of heat exchanger

[Pope33]

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)]
Contact Area = 40 m^2
Steam heat capacity = 2.07 kJ/kg K
Other fluid heat capacity = 3.91 kJ/kg K

I would appreciate your help.

 

[EdStainless]

Is the steam exiting as steam or water?
How did you get you heat transfer coef? Calculated?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[Pope33]

Yes the steam is exiting as condensate water.
Yes the transfer coefficient was calculated when the trail was done.

I hope this helps.