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Heat Transfer in a heat exchanger. 
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#1
May1111, 09:23 PM

P: 8

So this concept is confusing me.
You have a 20GPM, 150Degree F, 40PSIG water coming in to a heat exchanger through a 1" diameter pipe. Chilled water is available for cooling from a 6" diameter line at 40 Degrees F, With a pressure of 110PSIG and a flow of 270GPM. The original solution needs to be cooled from 150 degrees to 80 degrees exiting in a 1.5" line.
This is confusing me ~.~ 


#2
May1111, 09:24 PM

P: 8

So this concept is confusing me.
You have a 20GPM, 150Degree F, 40PSIG water coming in to a heat exchanger through a 1" diameter pipe. Chilled water is available for cooling from a 6" diameter line at 40 Degrees F, With a pressure of 110PSIG and a flow of 270GPM. The original solution needs to be cooled from 150 degrees to 80 degrees exiting in a 1.5" line.
This is confusing me ~.~ 


#3
May1111, 09:24 PM

P: 8

So this concept is confusing me.
You have a 20GPM, 150Degree F, 40PSIG water coming in to a heat exchanger through a 1" diameter pipe. Chilled water is available for cooling from a 6" diameter line at 40 Degrees F, With a pressure of 110PSIG and a flow of 270GPM. The original solution needs to be cooled from 150 degrees to 80 degrees exiting in a 1.5" line.
This is confusing me ~.~ 


#4
May1111, 10:08 PM

P: 688

Heat Transfer in a heat exchanger.
I would first ask which questions do you understand and which ones are confusing?
Much can be said about these topics  good to know where to start. 


#5
May1111, 10:30 PM

P: 8

I wanted to try and clarify this. If it is just a double tube simple heat exchanger like this shown here.
http://i56.tinypic.com/34znmti.png *What is the calculation to calculate the heat transfer coefficient. *How much surface area would be required between the two pipes for the solution to cool from 150 degrees to 80 degrees. 


#6
May1111, 10:30 PM

P: 8

I wanted to try and clarify this. If it is just a double tube simple heat exchanger like this shown here.
http://i56.tinypic.com/34znmti.png *What is the calculation to calculate the heat transfer coefficient. *How much surface area would be required between the two pipes for the solution to cool from 150 degrees to 80 degrees. 


#7
May1111, 10:30 PM

P: 8

I wanted to try and clarify this. If it is just a double tube simple heat exchanger like this shown here.
http://i56.tinypic.com/34znmti.png *What is the calculation to calculate the heat transfer coefficient. *How much surface area would be required between the two pipes for the solution to cool from 150 degrees to 80 degrees. 


#8
May1111, 10:40 PM

HW Helper
P: 6,207

For the value of U, I believe you need to use the fact that
[tex] \frac{1}{U} = \frac{1}{h_o} + \frac{1}{h_i}[/tex] where h_{o} is the outer heat transfer coefficient and h_{i} is the inner heat transfer coefficient. so essentially [tex] \frac{1}{U} = \frac{1}{h_{cold}} + \frac{1}{h_{hot}}[/tex] yes it is just like that in your diagram. You would need to look up how pressure and diameter relates to stress for the hoop stress. For the chilled water requirements, you will just need a simple heat balance on the system. 


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