Abstract
This work aimed to evaluate a microsprinkler irrigation system using photovoltaic energy without energy storage. The influence of photovoltaic pumping on irrigation was evaluated from the Emission Uniformity, Shewhart control charts and Process Capacity. The experiment consisted of two amorphous photovoltaic panels connected in parallel, directly connected to a water pump, where the flow of the pumping system was carried out through a ½” tube (main line), to the irrigation system composed of four microsprinklers. The voltage and current parameters were collected, and the power of the photovoltaic system was calculated, while for the irrigation system the pressures of the four microsprinklers were measured to later calculate the flow rate of the irrigation system. The experiment was conducted at the State University of Western Paraná, UNIOESTE, where 25 days of collection were carried out, in the open, at four different times, from 10:00 am to 11:00 am, from 11:05 am to 12:05 pm, from 2:00 pm to 3:00 pm and from 3:05 pm to 4:05 pm . Power generation presented a low coefficient of variation throughout the day, which resulted in flow and pressure stability, culminating in an Emission Uniformity (UE) value qualified as excellent (93.66%) according to the ASAE. The values of energy generation, flow, pressure, and emission uniformity presented a Process Capacity (CP) value above 1.33, defining the process as capable and adequate throughout the analyzed period.
Highlights
Increases in the need of water resources demands to serve all sectors, whether urban, industrial, or even agricultural, in the irrigation sector, stimulate research aimed at qualitative and rational use (Silva et al 2013).population growth requires increasing amounts and promotes competition for water between agriculture and other sectors of the economy (Alves et al 2015)
The average energy generated from the photovoltaic panel was below the ideal operating values of the pump (79 Wh), reducing the nominal flow from 234 L h-1 to 174.22 L h-1, that is, with a decrease of 25.316% of power required by the pump, there was a reduction of 25.547% in the flow to the irrigation system
Despite the energy supply values below the rated power of the water pump, the stabilization of energy over the collection periods resulted in low coefficient of variation values for the pressure, flow and emission uniformity parameters, resulting in in high emission uniformity
Summary
Increases in the need of water resources demands to serve all sectors, whether urban, industrial, or even agricultural, in the irrigation sector, stimulate research aimed at qualitative and rational use (Silva et al 2013).population growth requires increasing amounts and promotes competition for water between agriculture and other sectors of the economy (Alves et al 2015). Increases in the need of water resources demands to serve all sectors, whether urban, industrial, or even agricultural, in the irrigation sector, stimulate research aimed at qualitative and rational use (Silva et al 2013). Technicians and government office to guide the adoption of strategies to minimize water consumption guiding farmers. In order to minimize consumption and improve efficiency, the use of a localized irrigation system is essential, since it has greater uniformity in distribution, application efficiency and water productivity (Douh et al 2013). Localized irrigation applies water with high uniformity, close to the soil surface directly in the plant root zone in small quantities, but with high frequency, keeping the soil close to the root zone, close to the field capacity (Oliveira et al 2016)
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