heat transfer problem

[smokey2007]

(see attachment)

 

here is my problem

 

i know the delta temperature i want my nylon to be. with that i can solve for a multitude of things. to start off, this will give me my heat that is required to leave the nylon.

 

however, something went wrong. i am attempting to cool nylon, through stainless steel, and with flowly water on the other side in a series of heat exchange plates.

 

the last part of the attachment shows that when two different calculations are taken place, a different number results (not good).

 

as well as my Nusselt number is way too low. it should be a min of 100.

 

any help would be greatly appreciated on what i did wrong?!

heat_transfer2_calcs.txt