By Danish Technological Institute, published Oct 11, 2011 - 24 pages
Free cooling is a possible solution when the temperature for the cooling load is above the outdoor temperature. To increase efficiency on a yearly basis, the objective is to raise the temperature level at which free cooling can be applied in order to achieve more hours of free cooling operation. By supplementing the traditional glycol based free cooling system with a CO2 based system, the benefits of phase transition and an increased heat transfer coefficient are utilized and the temp
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