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Heat loss from a hot water vessel

Question asked by Will Griffiths on Oct 25, 2013
Latest reply on Oct 28, 2013 by Jared Conway

Hi,

 

I'm new to SW Simulation and am trying to model a hot water vessel to determine heat loss. The trouble is that I appear to get wildly different results when playing about, these range from unrealistically low to high and I therefore don't trust the results.

 

It's a simple model as far as I'm concerned - I've created a block of PIR insulation and extruded a cavity inside, then placed a water volume inside it. I then assigned a temperature to the water volume surface (45 degrees C) and a convection coefficient of 7.7 W/m2K to all external surfaces of the insulation. Clearly, I've ignored the metal cylinder itself.

 

Any thoughts on why results seem to fluctuate? I've used a curvature based mesh on the finest setting

 

Thanks

 

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