|
Metlov G.N., Korolev V.A., Belenov A.T. - Mobile Solar Photovoltaic Systems for Water-lifting Irrigation |
|
|
|
|
Written by Erkin Turdibaev
|
|
Tuesday, 14 November 2017 |
|
The possibility of using solar photovoltaic systems for water-lifting irrigation in the southern regions of Russia is considered. The advantages of using solar energy to lift the water are associated with seasonal coincidental of the maximum of annual solar radiation parish and the maximum of annual water requirements, with a relatively low probability of having cloudy days in spring-summer-autumn period. There is presented average statistical data on the number of sunshine hours and monthly sums of total radiation for the Rostov and Astrakhan regions, where irrigated agriculture is used quite widely. One of the most promising technologies for the solar water-lifting systems application can be use of irrigation set pipes to irrigate various cultivated crops by furrows. The structure of such systems includes flexible flat collapsible pipelines made of polymer materials. The main difference between these systems is that the water supply from open irrigation system demands pressure no more than 1–3 m. Furthermore, as in these systems water supply is carried out by furrows thermal shocks for the plants are eliminated, and the system can work in the daytime. To evaluate water-lifting unit parameters, you can use such a generalized indicator as 1,5 ÷ 2,0 W/m4 per day, whose meaning is that the supply flow rate of 1 m3 per day to a height of 1 m there is required 1,5 ÷ 2,0 W of solar photovoltaic battery power. For a more accurate calculating basic indicators of solar water-lifting systems, there is presented nomogram, which links the parameters of pump units, the required capacity of photovoltaic panels and the intensity of solar radiation. The nomogram allows to solve the inverse problem: according to the need of the daily water amount and knowing the desired height of lifting water from the irrigation network it can help to determine the required capacity of the photovoltaic battery. To reduce energy costs there is proposed to use low-pressure irrigation pipelines together with the pump units with axial impellers.
|
