Evaluation of Hydraulic Performance of the Compensating and Non-Compensating Emitters in Various Pressures and Temperatures

Document Type : Research Paper

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Abstract

Discharge of emitters changes by various factors such as pressure, manufacturing coefficient of variation, clogging and the temperature of water irrigation. In order to study the effects of temperature on discharge of emitters, 10 types of emitters have been tested in irrigation laboratory in Faculty of Water Sciences Engineering Ahwaz, ShahidCharmUniversity. In this research, the effect of 4 different temperatures i.e. 10, 20, 30, 40°C under 4 pressures i.e. 5, 10, 15, 20 m was reviewed. By calculation of manufacturing coefficient of variation and based on American Society of Agricultural Engineers Standard, qualitative classification of emitters was done. Finally, four type were excellent, two of them unusable and the others  were between both conditions. For experiments in temperature of 10° , the ice and in temperatures of 30° and 40°, a tank equipped with an electric heater and controlling unit for temperature was used respectively. With regard to obtained results by raising temperature of irrigation water, the discharge of non-compensating emitters was increased. In compensating emitters, the temperature didn't have significant effect on discharge of emitters in 3 cases, but in two types cause  discharge was decreased and in one, discharge was increased. In final, result showed that temperature doesn't have a significant effect on manufacturing coefficient of variation and water emission Uniformity.

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History

  • Receive Date: 23 April 2011
  • Revise Date: 29 September 2014
  • Accept Date: 02 October 2012
  • Publish Date: 21 November 2012

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