This brief guide is about heating, ventilation and air conditioning systems, often abbreviated to HVAC. The cooling towers used in heating, ventilating and air conditioning systems are primarily used to dispose or reject to atmosphere any unwanted heat generated from a chiller or cooling system.
Water-cooled HVAC chillers are typically more energy efficient than their air-cooled counterparts due to the method of heat rejection using tower water at or near wet-bulb temperatures.
Air-Cooled Chillers for HVAC Systems
Air-cooled chiller systems work by rejecting the unwanted heat at an elevated dry-bulb temperature, and so have a lower average effectiveness. In areas with a hot climate, data centres, large office buildings, hospitals, schools, hotels and other high demand facilities typically use one or more cooling towers as part of their air conditioning systems. Generally, industrial cooling towers are much larger than HVAC towers because of the cooling demand required and the amount of heat generated by industrial and process systems.
Cooling towers are also used in HVAC systems that have multiple water source heat pumps that share a common water system. In this type of common water system, the water circulating inside the loop removes heat from the condenser of the heat pumps whenever the heat pumps are working in the cooling mode. The cooling towers, which are usually located externally are then used to remove the unwanted heat from the water loop and expel it to the atmosphere.
Tower Shut Down & Decommissioning
When the heat pumps are operating in a heating state, the condensers will take heat from the water and use it to provide a source of heating for the space inside a building. When the water loop is being used primarily to supply heat to a building in this way, cooling towers are usually temporarily decommissioned or mothballed, and space heating is delivered by other means, usually by some form of boile
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