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1、The Efficiency of RainwaterHarvesting Systems by Stefan by Stefan 21 March 2013 21 March 2013 Introduction n nRainwaterharvesting systems are widely applied in mountainous and arid areas of northern Shaanxi Province in order to satisfy irrigation and drinking water demand. n nSo determination of the
2、 quantitative relationship between collected water and precipitation is a basic issue for optimizing these systems. Introduction n nHowever, serial related data is very limited because no experiment has been done under simulated rainfall conditions. n nIt is essential to get enough information and t
3、o use proper software to handle the data. The objectives of this research areto determine the quantity of rainwater that can be collected from a rainwaterharvesting system（common used） during different precipitation events and to design a GUI interface in Matlab to automatically get feedback about t
4、he amount of water collected during different precipitation eventsMaterials and Methods Sampling location : Mizhi county Soil type: loess-derived soil Experiment site: YanglingExperiment time: April 2012Employed tool: MatlabMizhi county Experimental Design Treatments Treatments (precipitation):(prec
5、ipitation): 0 (control), 3, 6, 9, 12, 15, 20, 30, 40, 50, 60, 0 (control), 3, 6, 9, 12, 15, 20, 30, 40, 50, 60, 70and 80 mm of 70and 80 mm of simulatedsimulated precipitation precipitationMeasurements: Measurements: Precipitation Precipitation Quantity of collected water Quantity of collected water
6、Application achieve:Application achieve: Through GUI design in Matlab, we can predict the Through GUI design in Matlab, we can predict the amount of collected water for any given amount of collected water for any given precipitation event precipitation event Conclusions n nWhen precipitation was les
7、s than 6 mm, no water was collected and the system efficiency was approximately zero n nWhen the precipitation increased from 6 mm to about 60 mm, the quantity of collected water increased faster than the precipitation, raising the collection efficiency to a peak of 40% Conclusions n nAs the precipi
8、tation increased above 60 mm, system efficiency remained just over 40%n nThe GUI interface functioned well. For example, with a precipitation event of 42 mm, we can predict 6.46 mm of collected waterQuestions?Questions?Thank youThank you！The Efficiency of RainwaterHarvesting Systems by StefanRainwat
9、erharvesting systems are widely applied in mountainous and arid areas of northern Shaanxi Province in order to satisfy irrigation and drinking demand. So determination on the quantity of rainwater that can be collected in different rainfall conditions from the rainwaterharvesting system is a basic i
10、ssue for optimizing these systems. However, no research has been done to get information in simulated rainfall condition, limiting getting serial data which is essential for a better understanding. We evaluated the water collecting efficiency of them in this paper. We tested this efficiency in 13 tr
11、eatments with simulated precipitations ranging from 0 mm to 80 mm. Matlab (R:2010a) was employed to interpose the precipitationcollected water function and a GUI interface was designed to automatically get the feedback of collected water quantity during different precipitation events. The collecting
12、 efficiency can be divided into three stages. When precipitation was less than 6 mm, no water was collected while when the precipitation increased from 6 mm to about 60 mm, the quantity of collected water increased faster than the precipitation, raising the collection efficiency to a peak of 40%. Af
13、ter that, as the precipitation increased above 60 mm, this efficiency remained just over 40%. The GUI interface functioned well. For example, with a precipitation event of 42 mm, we can predict 6.46 mm of collected water. This study indicated that efficiency of rainwaterharvesting systems increased as the precipitation after it reached the threshold value of 6 mm.
