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The purpose of this presentation is to:
Define Free Cooling,
Discuss the different types of free cooling systems that have, and are being used, along with the advantages and disadvantages of each,
Walk thru the design of a typical free cooling system while developing an understanding of the factors affecting performance and cost, and
Go thru “tips” for successful operation.
We setup our example with a 2,400 GPM secondary pumping station. The first two graphs are the 100% pump on the left, and the 50/50/50 on the right. The bell curve represents our building load profile. The blue line is the ‘’design’’ profile, whereas the red line is the ‘’Actual’’ profile line (notice the red line has a lower peak, and is to the left a little). What the graph on the right is showing us is that starting at 83% load, we start running on one pump (2 redundant).