2 replies to this topic

[Robie]

I have designed a heat storage tank, consisting of two concentric cylinders. The space between the cylinders is 5cm filled with fibreglass wool for insulation( circumferential and 2 bases). Charging is by thermosyphon principle. I would like to be helped with the calculation of the overall heat loss coefficients during both charging and cool down periods. Can someone explain thoroughly the Physics behind this, assuming the Liquid in the tank is stationary.

 

 

Thanks in advance.

[Robie]

Can I use the methods of LMTD?

[StealthProg]

You need the thermal conductivity of the insulation, surface area, depth and temperature difference, you ca use the average temperature difference between the strating point and end point which will give you an approximate answer.  In reality there are convective heat transfer effects but thats too detailed.