Wet-bnlb temperature

The above calculation has assumed that the water temperature (85°F) has remained unchanged down the tower. In reality, the water temperature will tend to approach the wet bulb temperature of the air. Because the water temperature will never drop below the wet bnlb temperature, the wet bulb temperature can thus be used as a limit of reduced performance. 

The regulation of the mode of operation can be realized manually or automatically. As a signal for regnlation, the temperatures of the drying space, the ontlet air of the collector, and the rock bed can be nsed. As a controlling signal for the operation of the dampers 6, the wet bnlb temperature or the relative humidity of the drying space can be applied. 

Trim Coolers Conventional air-cooled heat exchangers can cool the process fluid to within 8.3°C (15°F) of the design diy-bnlb temperatnre. When a lower process outlet temperature is required, a trim cooler is installed in series with the air-cooled heat exchanger. The water-cooled trim cooler can be designed for a 5.6 to 11.1°C (10 to 20°F) approach to the wet-bulb temperature (which in the United States is about 8.3°C (15°F) less than the dry-bnlb temperatnre). In arid areas the difference between dry- and wet-bnlb temperatnres is much greater. 

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