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Evaluating and minimizing water use ...

Sabeh, Nadia Christina.

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Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate./
Author:	Sabeh, Nadia Christina.
Description:	215 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3928.
Contained By:	Dissertation Abstracts International68-06B.
Subject:	Agricultural engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3272861
ISBN:	9780549123040

Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate.
Sabeh, Nadia Christina.

Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate. - 215 p.

Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3928.

Thesis (Ph.D.)--The University of Arizona, 2007.

Water availability is a common concern in semi-arid regions, such as Southern Arizona, USA. Hydroponic greenhouse crop production greatly reduces irrigation water use, but the study of water use by evaporative cooling has been limited.

ISBN: 9780549123040Subjects--Topical Terms:

3168406
Agricultural engineering.

Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate.
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100 1 $a Sabeh, Nadia Christina. $3 3186450
245 1 0 $a Evaluating and minimizing water use by greenhouse evaporative cooling systems in a semi-arid climate.
300 $a 215 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3928.
500 $a Adviser: Gene A. Giacomelli.
502 $a Thesis (Ph.D.)--The University of Arizona, 2007.
520 $a Water availability is a common concern in semi-arid regions, such as Southern Arizona, USA. Hydroponic greenhouse crop production greatly reduces irrigation water use, but the study of water use by evaporative cooling has been limited.
520 $a This project investigated water use by two evaporative cooling systems: pad-and-fan and high-pressure-fog with fan ventilation. All studies were performed in a double-layer polyethylene film-covered greenhouse (28 x 9.8 x 6.3 m) with mature tomato plants (2.9 plants m-2). Water use efficiency (WUE, kg yield per m3 water use) was calculated daily according to ventilation rate, as well as for a 6-month cropping period, which used temperature-controlled pad-and-fan cooling.
520 $a Pad-and-fan water use was 3.2, 6.4, 8.5, and 10.3 L m-2 d-1 for ventilation rates of 0.016, 0.034, 0.047, 0.061 m 3 m-2 s-1, respectively. High-pressure-fog water use with a single central, overhead line was 7.9, 7.4, and 9.3 L m -2 d-1 for ventilation rates of 0.01, 0.016, 0.034 m3 m-2 s-1, respectively. For pad-and-fan ventilation rates less than 0.034 m3 m-2 s-1, total greenhouse WUE (20--33 kg m-3) was similar to field drip irrigation. For the temperature-controlled high-pressure-fog system, total greenhouse WUE (14--17 kg m-3) was similar to field sprinkler irrigation.
520 $a For the 6-month crop cycle, combining water use by closed irrigation and pad-and-fan systems produced a total WUE of 15 kg m -3. Pad-and-fan WUE increased during monsoon conditions due to lower water use rates.
520 $a Evaporative cooling water use and air temperature were well-predicted by the energy balance model. Predictions of air temperature improved when outside climate the measured conditions at one greenhouse location. Wind tunnel and full-scale studies of natural ventilation demonstrated the value of knowing airflow patterns when designing and operating a high-pressure-fog system.
520 $a It is possible for greenhouse tomato production to have a higher WUE than field production, if ventilation rates are not excessive, if closed irrigation is used, and if control methodologies are improved. Water use can be minimized by knowing how the evaporative cooling system affects greenhouse climate and plant responses.
590 $a School code: 0009.
650 4 $a Agricultural engineering. $3 3168406
650 4 $a Horticulture. $3 555447
690 $a 0539
690 $a 0471
710 2 $a The University of Arizona. $b Agricultural & Biosystems Engineering. $3 1019524
773 0 $t Dissertation Abstracts International $g 68-06B.
790 $a 0009
791 $a Ph.D.
792 $a 2007
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3272861