Heat Exchanger Question

[jamesk]

Dear all,

 

I have a thermodynamics exam this week and am going through tutorial questions for which I have answers but no worked solutions. Can you please help in finding them?

 

I don't know what equations to use to find the effectiveness and the fluid outlet temperature in the attached question.

 

I think there may be a way to use 'E (effectiveness) = Q/ C min (Th1-Tc1)' , where Th1 and Tc1 are the hot fluid and cold fluid inlet temperatures respectively. There may be a method to get Q from the info given in the question, but I don't know a useful formula.

 

I have attached the ques. and the answers are at the bottom right corner of the attachment.

 

Thank you for looking, JK

 

p.s. If you press ctrl and use the mouse scroll button you can zoom in and see the attached pic. clearer as it is a bit hard to read.