Tool - Q[W] for an insulated Box in LTSpice

[iMo]

Attached a simulation of the rate of heat transfer Q[Watt] for an insulated box.
It should produce the same results as the excel table I published some time back.
There is a youtube link inside - that is a lecture this tool is based on.
The inner sizes of the box (w,l,h) and the insulation thickness (d) are in meters.
Provided as-is, use at your own risk..
 

PS: there are two shape factors - for edges (0.54) and corners (0.15) - those have to be adjusted in case the the insulation thickness d is comparable with the w or l or h. There are books written on this topic thus feel free to investigate..