PSYCHROMETRIC CHART FUNDAMENTALS:DEHUMIDIFICATION AND REHEAT

DEHUMIDIFICATION AND REHEAT

Dehumidification lowers the dry-bulb temperature, which often requires the use of reheat to provide comfortable conditions. Dehumidification and reheat are actually two processes on the psychrometric chart. Applications, such as computer rooms, textile mills, and furniture manufacturing plants require that a constant relative humidity be maintained at close tolerances. To accomplish this, the air is cooled below a comfortable level to remove moisture, and is then reheated (sensible heat only) to provide comfort. Figure 29 is an air conditioning system with both a cooling coil and reheat coil.