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I've used the Taco-HSS program and found it very helpful. Like most computer programs you're asked to input the entire system and it determines the highest pressure drop. You create a piping diagram with a Visio type interface and then tell the program what all the loads are. I went from...

Just two more thoughts on this Isn't most electrical equipment rated for 104F (40C)? Not the most profound difference, but if you are documenting your calculations. . . Second, is there any reason to ventilate the space below 80F room temp? From an energy stand point 'off' saves the most...

When using waste steam keep an eye on the variablity of the cooling load. If the cooling load is constant and the waste stream is also constant everything works out great. if the cooling load varies with Outside temperature for example the you'll have to dump you waste steam or create a false...

Everything TADiep said is true. But you do have to look at the application and environment. Yes, I use heavy computer loads for computers in general but then I'm using that to cover miscellaneous office equipment that no one can tell me about when I'm running loads (like copiers fax machines...

What about xtra filtration of the return air and UV or BiPolar Ionization treatment of the supply airstream? According to their salesmen it can bring the outside air requirements back down to the 5 cfm level. They wouldn't lie to us, would they? Honestly I haven't tried it. But Its something...

If you are going to use outside air to cool in the winter, fine. But keep an eye on your humidity levels, the electrical guys get a little nervous as they drop below 20%. Not an unsolvable problem, but it should be addressed. Ultrasonic or high pressure water humidifiers can address the issue...

I would caution against using commercial equipment for UPS cooling. The standard commercial cycle is 3000 hours per year of operation and this equipment lasts 15 or 20 years. A UPS room will require 8760 hours of mechanical cooling per year. This is partly why the computer room units are so...