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Heat Transfer Temperatures


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#1 Noran Shedid

Noran Shedid

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Posted 19 June 2020 - 09:00 AM

Is it reasonable for air to enter a heat exchanger at 140 oC and exit at 46 to heat pentane from 35 to 130 oC?

#2 Chemitofreak

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Posted 20 June 2020 - 09:32 AM

Can you provide some background about the system

 

I would rather use steam for heating purpose then air, but that is because I do not have any idea about your system.


Edited by Chemitofreak, 22 June 2020 - 01:38 AM.


#3 MrShorty

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Posted 22 June 2020 - 01:54 PM

Reasonable is rather subjective. How do you intend to decide what is "reasonable"?

 

Part of this might depend on where you are at as a student in your studies,but It essentially boils down to a heat/energy balance calculation. Given only the temperature differences, calculate how much heat is provided by the air. Then calculate how much heat is required by the pentane. Figure in any inefficiencies or heat losses you are expected to include. Identify your changeable parameters (flow rates, pressures, maybe?). Finally, solve the system so that the net heat/energy change is 0 (the amount of heat supplied by the air=heat "lost"+heat absorbed by pentane). Then you can decide, based on what parameters you varied to balance the heat/energy whether it is "reasonable."






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