Air Distribution and Its Uniformity

Ying Zhang, Murat Kacira

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Scopus citations


Air distribution system in plant factories with artificial lighting (PFALs) is responsible for the air exchange and replacement to create desired growing conditions for plants. Combined effects of multitiers, heat from supplemental light ing, improper air conditioning, and air distribution system design can lead to environmental nonuniformity in PFALs. The principle for the design of air distribu tion system is to understand the physics of wind and how crops response to wind. This chapter describes how wind affects the photosynthesis and transpiration pro cesses of crops by briefly explaining the theory of leaf boundary layer and boundary layer resistance. Then an example application of improving air movement to prevent plant physiological disorder (e.g., tipburn in lettuces) is introduced. For the design of air distribution system, the overall control with mixing ventilation systems and the localized control with cooling fans and perforated air tubes are described. Finally, several indices for assessment of ventilation performance are defined such as air exchange effectiveness, local mean age of air, efficiency of heat removal, and coefficient of variation.

Original languageEnglish (US)
Title of host publicationSmart Plant Factory
Subtitle of host publicationThe Next Generation Indoor Vertical Farms
PublisherSpringer Singapore
Number of pages14
ISBN (Electronic)9789811310652
ISBN (Print)9789811310645
StatePublished - Jan 1 2018


  • Air distribution system
  • Air exchange effectiveness
  • Air movement
  • Boundary layer
  • Boundary layer resistance
  • Coefficient of variation
  • Computational fluid dynamics
  • Cooling fan
  • Efficiency of heat removal
  • Local mean age of air
  • Perforated air tube
  • Simulation

ASJC Scopus subject areas

  • General Engineering
  • General Environmental Science
  • General Biochemistry, Genetics and Molecular Biology
  • General Economics, Econometrics and Finance
  • General Business, Management and Accounting
  • General Agricultural and Biological Sciences
  • General Earth and Planetary Sciences


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