Application Manuals

Dehumidification in HVAC Systems

  • Application Manuals
  • $16
  • Item # SYS-APM004-EN
  • Published Jan 1, 2002

Discusses the dehumidification of HVAC systems when it comes to performance of various, cold-coil commercial, particularly at part-load conditions.  

Topics include:

  • Why control humidity in buildings?
  • Sources of moisture
  • Cold coil versus desiccant dehumidification
  • Full-load versus part-load conditions
  • ASHRAE weather data
  • Dehumidification performance of constant-volume systems (packaged direct expansion DX equipment, energy recovery, fan-speed adjustment, mixed-air bypass, return-air bypass, DX coil circuiting, dual path air handlers, supply-air tempering or reheat)
  • Dehumidification performance of VAV systems (minimum airflow settings, supply-air temperature reset, supply-air tempering at VAV terminals, colder supply-air temperatures)
  • Dedicated outdoor-air systems (neutral versus cold, to space versus to other units, reset control strategies)
  • Unoccupied humidity control
  • Building pressure control
  • Airside economizer control
  • ASHRAE Standards 62 and 90.1

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January 01, 2002