It is estimated that for every degree cooler the water supplied by the cooling tower to the chiller is, chiller efficiency will increase two to three percent. The reality, however, is that the chiller’s efficiency improves with cold condensing water, which comes from the cooling tower. Consequently, more attention is paid to the chiller than the cooling tower in most facilities. Chillers use about five times the energy of the cooling tower. Many people overlook the importance of the cooling tower to the overall energy efficiency of a building’s cooling system. Cooling towers come in all sizes from as small as a minivan to as large as a three story building covering the area of a football field. The induced draft counter flow cooling tower is probably the most common. In cross flow cooling towers, the air enters the side of the tower and travels perpendicularly to the water stream. In counter flow cooling towers, the air enters at the bottom of the tower and travels up in the opposite direction of the water stream. In forced draft cooling towers, the fan is mounted on the side of the tower and is used to “push” air through the tower. In induced draft cooling towers, the fan is mounted at the top of the tower and is used to “pull” air through the tower.
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