CH-85-07-1 -- Indirect Evaporative Cooling—Mechanical Cooling Design PDF

Useful evaporative cooling depends on the wet-bulb temperature of the air entering the equipment, but it is evident that indirect evaporative cooling components, coupled with mechanical refrigerating components, offer the designer a cost-effective design solution to comfort cooling even in areas of the country having relatively high design wet-bulb temperatures. This paper demonstrates that indirect evaporative cooling (where the evaporative effect is used in an arrangement that does not add moisture to the supply airstream) can be used in series with mechanical cooling in ways that result in lower annual operating costs.