Chemical Storage Tank Heat Transfer in Sun versus Shade

[HydroAU]

I am trying to present the benefits of installing a roof structure to shield a sodium hypochlorite storage tank (FRP material) from direct sunlight and mitigate chemical degradation. I would like to try and quantify the increase in average temperature of the chemical within a sun-exposed tank in relation to a shaded tank.

I thought I could possibly use a simplified method where you have (mC_pΔT/t)_chemical + (mC_pΔT/t)_tank + UAΔT to calculate the required heat input and compare this value to solar radiation data. My biggest question is in regards to the overall heat transfer coefficient U.

Would it be reasonable to assume that, all other things being equal, the overall heat transfer coefficients would be roughly the same or at least in a similar range between the sun and shaded scenarios?

A second question is in regards to the heat used to increase the temperature of the tank material. I am not particularly interested in increasing the tank temperature, but believe it needs to be factored in since the solar radiation does not act on the chemical directly and some heat will be spent to increase the tank temperature. If I am evaluating a 1 °C temperature increase in the chemical, would it be reasonable to assume a 1 °C increase in the tank material as well?

Thanks for the help!

 

[IRstuff]

The integrated radiance from 0.2 um to 20 um in Modtran for 23-km visibility mid-latitude summer results in an equivalent blackbody temperature of ~250 K looking straight up.

Infrared thermometers only see LWIR, so there are some caveats, notably that urban aerosols that are relatively emissive, compared to the air itself.

The cited article appears to have elided some considerations when looking at radiometric measurements. It looks like they ignored the radiated emission to the back side of the bottom plate, which affects the apparent sky temperature.

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[MortenA]

API 521 has some rule-of-thumb nos for radiation. Cant remember if bith sunlight and shade is included