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Max Bulk Temperature Attained Due To Solar Radiation


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#1 ayan_dg

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Posted 25 November 2010 - 01:16 AM

I have an API 650 Internal Floating roof tank storing Methanol. The tank has no insulation. The maximum rundown temperature of Methanol is 45°C. Tank dimension is 25 m dia and 15 m height , the tank is Nitrogen blanketed.
Max ambient temperature is 44°C , max solar radiation is 947 W/m2 , sun metal temperature is 75°C.
Boiling point (Normal) of methanol is 65°C.
I want to calculate max temperature attained by Methanol in a day due to Solar radiation effect considering run down does not come for a day.
This I need to know to estimate whether I need a cooler or not. Also I find out the max vaporization rate due to solar heating. The tank vent goes to Flare.

#2 Zauberberg

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Posted 25 November 2010 - 09:49 AM

If you know the total absorbed heat (kJ), it should be equivalent to Methanol temperature rise + Heat required to evaporate calculated vapor flow. Following the basic thermodynamic rule, temperature of Methanol cannot increase above its boiling point till all the Methanol inside the tank has evaporated.

#3 ankur2061

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Posted 25 November 2010 - 12:01 PM

Ayan,

The attached file should help you in determining the evaporation due to solar radiation from a tank.

Regards,
Ankur.

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