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re: solar fan for greenhouse
10 oct 2004
mike c.  wrote:

>love the math!  i am an engineer at caterpillar.  


>i do not think that vents will work in this case.

why not?

>it is a small 12x12 pit greenhouse... i would like to use it in the
>summer time but i run 120-130 in full sun.  i need to keep it at 90. 

at 80 f outdoors, 0.2x0.9x250x12x12 = 6480 btu/h = 16.6asqrt(8)(90-80)^1.5
makes a = 4.36 ft^2, eg a 2'x2' gable end vent.


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