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Variable air volume system heat recovery economizer.

Author(s) : SCOFIELD C. M., DESCHAMPS N., WEAVER T. S.

Type of article: Article

Summary

Outdoor air–return air–exhaust air economizer systems on VAV air-handling units (AHU) have sometimes created IAQ problems as the supply fan air volume decreases (during cold ambient conditions) to match the building cooling requirements. The minimum outdoor air fraction prescribed by ASHRAE Standard 62.1-2016 drops below acceptable levels without reheat at the AHU. Often, indoor zone air change rates (ach) are kept high because of a mistaken perception that high ach will yield better IAQ. The result is wasted reheat energy at the interior zone VAV terminals and increased fan energy at the supply fan.

Details

  • Original title: Variable air volume system heat recovery economizer.
  • Record ID : 30018236
  • Languages: English
  • Source: ASHRAE Journal - vol. 58 - n. 5
  • Publication date: 2016/05

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