I have a small computer datacenter that consumes about 25kw. Airconditioning cools it to about 25C.

When renewing the airconditioning, I suggested replacing it with air heat pumps for 'green' cooling, so the heat could be used to heat water for radiator space eating or hot water heating. I was hit by a barrage of reasons why this wouldn't work, although my calculations suggest it would. However, I can't find any suppliers for this, which suggests I am wrong.

Would it work, and if not, why not?

I have been told that the substances in gravy react together and bind when they cool - it is not, apparenty just a case of a liquid turning to a solid. I would like to know why this happens, and even hopefully what molecules are involved. Thankyou xxx