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Design Margin


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#1 Chemitofreak

Chemitofreak

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Posted 11 June 2018 - 04:55 AM

All,

 

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. 

 

Regards.



#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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