Evaporative Cooling Tower Design

An evaporative cooling tower provides cooling based on a design wet bulb temperature.

Evaporative cooling tower design.

The towers themselves are enclosed steady flow devices for cooling water by evaporation through direct contact with air. Evaporating water at the top of a cooling tower creates a downdraft of cooler air that can then be circulated to a specific space or area. Design considerations of cooling tower. Cooling towers work on the principle of heat rejection.

For new buildings design teams can demonstrate the cooling tower s contribution to indoor water reduction with makeup water meters conductivity controllers and overflow alarms and drift eliminators. Evaporative cooling uses the fact that water will absorb a relatively large amount of heat in order to evaporate. 14 3309 ft3 lb dry air air enthalpy. When evaporative cooling is used with supplemental dx cooling it can reduce the dx cooling required.

In hot dry climates evaporative cooling towers will cool outdoor air and circulate it to a space or building. 0 0714 lb ft3 air specific volume. A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. The required cooling tower design and size will be a function of following values.

They are the most economical approach to cool large amounts of water. Evaporative cooling towers typically cool water to approximately 85 f but may cool as low as 65 f. Energy design resources e news april 2010. Moreover since they use 100 outside air for cooling the right evaporative cooling system can improve indoor air quality while reducing overall operating cost and energy consumption content source.

For most industrial manufacturing electric power generation and even air conditioning needs cooling towers are a critical element of the design. The efficiency of this device depends essentially on climatic conditions in particular the wet bulb temperature and the relative humidity of the ambient air. Evaporative cooling differs from typical air conditioning systems which use vapor compression or absorption refrigeration cycles. Cooling tower thermal design manual air density.

An evaporative cooling tower system capable of achieving these goals has the potential to earn points toward energy optimization credit. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet bulb air temperature or in the case of closed circuit dry cooling towers rely solely on air to cool the working fluid to near. 46 3774 btu lb dry air download the example file exe1 1 zip this file covers the examples of 1 1 through 1 4.