Water use by greenhouse evaporative cooling systems in a semi-arid climate

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Water availability is a common concern in semi-arid regions, such as Southern Arizona, USA, where greenhouse crop production is popular due to high solar radiation. Hydroponic greenhouse crop production greatly reduces irrigation water use; however, water use by evaporative cooling systems has never been quantified. This project investigated water use by two evaporative cooling systems: pad-and-fan (P&F) and high-pressure-fog (HPF) with fan ventilation and a central overhead line. Water use data were collected from a double-layer polyethylene film-covered greenhouse (28 × 9.8 × 6.3 m) with mature tomato plants (1.7 plants m -2) from 08:00-17:00 for each ventilation rate tested under semi-arid climate conditions (T Out,Avg=35°C, RH Out,Avg=10%, Solar Avg=900 W m -2). Total daily water use by P&F was 3.2, 6.4, 8.5, and 10.3 L m -2 for ventilation rates of 0.016, 0.034, 0.047, 0.061 m 3 m -2 s -1 respectively. Total daily water use by the HPF system was 7.9, 7.4, and 9.3 L m -2 for fan ventilation rates of 0.01, 0.016, 0.034 m 3 m -2 s -1, respectively. Total greenhouse WUE (water use efficiency) was calculated using hydroponie irrigation (4.5 L m -2) and evaporative cooling water use. Total WUE values were comparable to sprinkler-irrigated WUE (15-19 L m -2) and flood-irrigated WUE (<12L m -2). Using a "closed" hydroponic irrigation system would increase the WUE greatly and should be implemented to conserve water. Furthermore, HPF water use should decrease under natural ventilation.

Original languageEnglish (US)
Title of host publication2007 ASABE Annual International Meeting, Technical Papers
Volume8 BOOK
Publication statusPublished - 2007
Event2007 ASABE Annual International Meeting, Technical Papers - Minneapolis, MN, United States
Duration: Jun 17 2007Jun 20 2007

Other

Other2007 ASABE Annual International Meeting, Technical Papers
CountryUnited States
CityMinneapolis, MN
Period6/17/076/20/07

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Keywords

  • Controlled environment
  • High-pressure-fog
  • Pad-and-fan
  • Ventilation
  • Water use efficiency

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Engineering(all)

Cite this

Sabeh, N. C., Giacomelli, G. A., & Kubota, C. (2007). Water use by greenhouse evaporative cooling systems in a semi-arid climate. In 2007 ASABE Annual International Meeting, Technical Papers (Vol. 8 BOOK)