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Design Margin

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#1 Chemitofreak


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Posted 11 June 2018 - 04:55 AM



Can any one explain the meaning of the following, I have came across the same in one of the Air Cooler Datasheet:


Exchanger to be designed 125% of flow and 120% of surface Area


Does it mean that the exchanger shall have 25% margin on the flowrate and 20% excess area on top of that.


For me 20% excess area for a Air Cooler is over the top requirement.


Thanks in advance. 



#2 Chemitofreak


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Posted 15 June 2018 - 02:20 AM

# Response Awaited.

#3 Saml


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Posted 15 June 2018 - 06:33 AM

It means what the client wanted to mean. The only way to know is to ask for clarification. If you are reviewing an existing exchanger, you would have to re-calculate it and make an educated guess as to what was designed.


- May be that it should work at 125% flow or have 20% excess area whatever gives the bigger design.

- Or may the client wanted a design for 125% flow and then to add 20% area.

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