bank of heat exchangers 1

[AO1958]

Hi there,

Hope somebody can help me in this topic.

I have to calculate three different heat exchagers - put in bank in the air flow direction - to cool water coming from a glass furnace.

Following is the topic: I have the fan curve of the producer given according to standard conditions, but inlet temperature of air in the first heat exchanger is 106F.
Threfore the point is that this air flow will pass through these three heat exchangers.

I think I need to fix the air flow.
My opinion is not to consider volumetric air flow, since we all know volumetric flow will change when passing through these heat exchangers.
A more reasonable solution would be:
1 - To calculate the volumetric air flow with given fan curve at standard conditions.
2 - To calculate the mass flow @conditions where the curve is given (mass flow = volumetric*density@standard conditions)
3 - To utilize this mass flow to calculate the capacity for the three heat exchangers.

Please, has anybody any different idea ?
Many thanks for your feedback, comments or opinions.

 

[speco]

Ione,

A quick check to verify the altitude correction factor. If you use -.00037 in the formula, and plug in an altitude of, say, 5000 ft, you get a correction factor of .157. If that were the case, everyone in Denver would be dead from hypoxia. (amb pressure would be 2.30 psia)

If you use -.000037, it results in a correction factor of .831, which makes more sense.

Regards,

Speco.

 

[ione]

Speco,

I had meanwhile double-checked and drawn the conclusion you were right and this is why I gave you a star.

 

[AO1958]

To all, many thanks.
I will apply your formulas and get back to you, should it be the case.

Thanks again.