Dear Aiyub,

There appears to be something wrong with the last part of the calculation :

Your friend is assuming 1 air change per hour (thats fine!) and therfore you will get 19,200 Btu/hr

Now , 19,200 Btu/hr x 24/18 = 25,600 Btu/hr (not 256,000 Btu)

Note that Dan came-up with 24,000 Btu/hr ( so your friend's method is not so bad after all)

My computer programme came up with 27,255 Btu/hr. I'm contemplating putting it on a PDA application where refrigeration personnel can come up with quick and accurate load calculations on the spot !

Compressor : Bitzer 4CC-6.2 Y