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Air Cooled Heat Exchanger Performance
#1
Posted 11 August 2017 - 11:31 PM
In GTP, i have an air cooled heat exchanger designed as follows:
Duty: 1079.54 kw
air data:
Design air temperature: 45℃
Design air outlet temperature: 47.87℃
Number of fans 4
Air flow/fan: 36.09 m3/s
Altitude: 581 m
Elevation: 6 m
Process data:
Mass flow: 149951 kg/hr
Cp: 2.707 kj/kg/℃
Inlet temperature: 64℃
Outlet temperature: 55℃
What happened to the ACHE if the operating conditions are other than design conditions? Does the ACHE has a constant duty regardless the in/out temperatures?
Please help
#2
Posted 12 August 2017 - 01:02 AM
https://checalc.com/calc/AirExch.html
Hi ,
Is it a unit in service ?
Consider the resource attached . BTW did you check the cleanliness of the HX ? Dirt can affect the performance very easily .
Hope this is helping you.
Breizh
Edited by breizh, 12 August 2017 - 01:10 AM.
#3
Posted 12 August 2017 - 01:23 AM
Dear sargon 1979,
I did not understand " operating conditions other than design conditions".
I presume your query as - " operating conditions if exceeds design condtions" .
My reply: Yes. Depending upon operating parameter under consideration & its value, Heat exchanger duty & performance both can be
affected.
Your Query: Does the ACHE has a constant duty regardless the in/out temperatures?
My reply: No, Duty will change if inlet / outlet temperature is changed keeping other operating parameters constant.
Kindly look / refer text book of Heat transfer by D.Q. Kern.
Hope this helps.
Regards,
SPC
#4
Posted 16 August 2017 - 12:05 AM
Q = UA(delta T)LM
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