COOLING TOWER NOMENCLATURE

Cooling Tower Range
Cooling Tower range is a diffential temperature between the water entering to the cooling tower and the water leaving the cooling tower. For example, if entering water (hot water) temperature is 100° F, and leaving water (cold water) temperature is 90°F, the cooling tower range will be 10° F.

Cooling Tower Evaporation Loss
Cooling tower evaporation loss is the quantity of water evaporated during the circulation.

Blow Down
Blow down may also be reffered as bleed or purge. It is the water flushed out of the circulation system to counter the accumulation of dissolved solids.

Cooling Tower Approach
Cooling tower approach is a difference in temperature between the cooling tower outlet temperature and the wet bulb temperature. For example if the outlet temperature from cooling tower is 90° F and the design wet bulb temperature is 83° F, the cooling tower approach will be 7° F.

Cooling Tower drift Loss
Cooling tower drift loss is the loss of water occured due to the spillage of water droplets picked up by the air and carried out of the cooling tower.

Make – Up Water
Make up is the water filled in to the cooling tower to compensate all losses (Evaporation loss and Drift loss).

Cooling Tower Capacity
The heat rejection capacity of a cooling tower is called cooling capacity, which is calculated in the unit of TR, BTU/Hr or kcal/Hr considering the mass (water flow) temperature difference and specific heat.