The refrigerant vapour passing through the tubes is condensed by giving up its heat to the air stream. The remaining water Since the water-cooled and evaporative condensers offer condensing temperatures limited by ambient wet bulb temperature, which is almost always lower than ambient dry bulb temperature, refrigeration systems with these types of condensers can work with lower condensing temperatures, thus using energy more efficiently. Consequently, systems with these types of condensers have higher coefficient of performance and refrigeration capacity than the systems with an air-cooled condenser. Furthermore, the water-cooled and evaporative condensers require a lower air flow rate than that of the air-cooled condenser because of the fact that these types of condensers rely on not only sensible but also latent heat transfer.