My rules of engagement will not change from the previous pieces in this series, so we can actually make some apples-to-apples comparisons when we get to the end. Upon completion of this series, we will apply these algorithms to a couple different scenarios to explore the variables which might make one model more attractive than another. In today’s piece, I will present algorithms for assessing the relative merits of water-side economization when the economizer (heat exchanger) and chiller are parallel, as illustrated in Figure 3. In November I began the conversation on free cooling, starting with water-side economization with economizer and chiller in series with each other, enabling periods of partial free cooling. In September I covered cooling coil performance. My task in a series on cooling efficiency algorithms is to provide a roadmap for removing some of the guesswork in both design decisions and management practices. Therefore, one might conclude that merely opening all the windows to let the hot air out and let cooler air in would provide the best path to energy savings and capacity optimization. Next to powering all our IT equipment, powering the mechanical plant to cool all that IT equipment is the largest energy consumer in the data center and is frequently the main constraint to growth.
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