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Active desiccant integration with packaged rooftop HVAC equipment.

Author(s) : SAND J. R., FISCHER J. C.

Type of article: Article

Summary

Current research indicates a direct correlation between indoor air quality and fresh air ventilation rates which supports requirements for building ventilation standards calling for continuous supply and increased amounts of ventilation to help assure safe and healthy interior air environments. The integration of a rooftop, unitary air conditioner with an active desiccant module, allows the use of a standard rooftop air conditioner with a thermally regenerated active desiccant component to provide a compact, cost-effective, and simple-to-use packaged system for efficiently pretreating and supplying ventilation air adequate to ensure healthy indoor environments. By designing a combined vapour-compression/active desiccant system with the desiccant component positioned after a conventional cooling coil, the dehumidification effectiveness of the desiccant is significantly enhanced because it operates on cold, saturated, or nearly saturated, air leaving the evaporator. "Postcoil" rather than the normally used, "precoil" desiccant arrangement also minimizes the regeneration temperature required for the active desiccant, allows for partial bypass and postcooling of the desiccated air after recombination, and dramatic decreases in the overall size for the preconditioning unit.

Details

  • Original title: Active desiccant integration with packaged rooftop HVAC equipment.
  • Record ID : 2006-0902
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 25 - n. 17-18
  • Publication date: 2005/12

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