COMBINED WET DRY COOLING-TOWERS OF CELL-TYPE CONSTRUCTION/

This article provides a general picture of the state of technical deve lopments with respect to wet/dry cooling towers. More stringent enviro nmental protection requirements led to the introduction of the hybrid cooling tower, which effectively suppresses detrimental plume formatio n at an efficiency level comparable to that of the wet cooling tower. It is explained that the attainable exhaust air state, in conjunction with the ambient air state, is the only possible basis for a decision in order to obtain both a low-priced design and proper functioning. Th e cell-type construction, including material selection and automatic o peration of the recooling system, is described in detail. In the last section, the fluid cooling tower, designed for a closed circuit, is pr esented as a combination of the essential elements of wet and dry cool ing technology. When the ambient temperature is low, the fluid cooling tower can also be operated as a dry cooling tower, i.e., without wate r consumption or plume production, Roth hybrid and fluid cooling tower s of die cell type conform particularly well to the more stringent env ironmental protection requirements and to the standard of operational reliability set for recooling systems. It is therefore to be expected that use of these types will became more widespread.