[Strawbale] window/sill details

[Matt Chase]

If I'm correct, the turbulence generated by a recessed window when 
compared to a window flush with the wall surface would increase heat 
loss.  Also, only important for deep recesses, there is more 
external surface area which leads to further heat loss.  Consider 
the design of heat exchangers: lots of surface area, generating lots 
of turbulence apparently makes a good heat exchanger.  The question 
is, how big is the difference?

Matthew Chase

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Maintenance issues aside, I'd heard that inset windows lose less 
heat.  The reasoning, apparently, is that airflow over a flatter 
surface (wall and window) is greater, thereby being able to peel 
away more heat.

Can anyone back this up?


-Mark Nagel
Everett, WA


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