Easy problem with heat transfer from surrounding air to water tank

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SUMMARY

The discussion focuses on calculating heat transfer from surrounding air to a closed water tank. The tank has a surface area of 47 m², with water at 14°C and surrounding air at 20°C. The heat transfer equation is defined as Q=UA, where U is calculated using the formula U=1/(R1+R2+R3). The values for R1, R2, and R3 are discussed, with R1 being 0.12, and R2 calculated based on the tank material's thickness and thermal conductivity. It is concluded that the R-value for heat transfer between water and tank material is negligible and can be ignored.

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JonasTj
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Hi!
Im doing some measures on a closed water tank with the water temperature 14C and surrounding air with temperature of 20C. I want to know how much heat transfer there is between the surrounding air and the tank.

A= 47m2 (area of tank in contact with the surrounding air)
Q=UA
U=1/(R1+R2+R3)

R1= air to tank transfer = 0.12 (i found this value)
R2= heat transfer in the tank material = d/λ. d=0.1 λ=1
R3= heat transfer between water and tank material. How do i calculate this?

Best regards / Jonas
 
Science news on Phys.org
Welcome to PF!

Unfortunately, heat transfer is not an easy thing to calculate. Fortunately, the heat transfer between water and tank is so good, the R-value is near zero so you can ignore it.
 
Thank you very much for your help!
 

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