Performance evaluation of Solar Power-Driven Pump Irrigation System at NIA Division II) Talavera, Nueva Ecija
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Date
2024
Authors
Nathaniel A. Gonzales
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Abstract
The research focused on assessing the performance of a solar powered pump irrigation system at NIA (Division II) Talavera, Nueva Ecija. The evaluation comprised three trials, first starting at 9:00 am, the second beginning at 12:00 pm and concluding at 12:30 pm, and the third commencing at 3:00 pm and concluding at 3:30. Various parameters, including ambient conditions, PV temperature, solar array, solar input and output and discharge, were recorded at one-minute intervals over a 30-minute duration. The average ambient conditions for the surrounding temperature were 30oC, and the relative humidity was 57.03%. The average solar radiation was 414.90 W/m2, PV temperature recorded at 34.50oC, solar input voltage at 512.69V and amperage at 19.46A. The solar output averaged 222.14V with an amperage of 3.95A. The discharge rate was measured at 18,774.4L/h. After collecting the data, head loss calculations were performed, resulting in 0.12m and 8.54m for total head in trial 1, 0.13m head loss and 8.55m total head in trial 2, and 0.05m head loss and 8.47m total head in trial 3. Subsequently, the total head and head loss data were used to determine the system and pump efficiencies. In trial 1, pump efficiency was 57.04%, and the system efficiency was 3.87%. for the second trial, pump efficiency was 52.59% and system efficiency was 3.85%. In the third trial, pump efficiency was 38.85% and system efficiency was 7.71%.
Water drawdown data were obtained both before and after the operation of the Solar Power-driven Pump Irrigation System (SPIS). The initial measurement, taken at 8:00 am using a Solinst 101 P2 water level meter, recorded a value of 3.21 Mbgs. By 4:00 pm, the drawdown was measured again, registering a value of 4.82 Mbgs. This indicates a decline of 1.61 Mbgs from the initial measurement, and the SPIS operated the pump for a total of eight hours. The establishment of a 10-hectare field for irrigation utilizing a Solar Power-Driven Pump Irrigation System (SPIS) was undertaken. The cropping schedule adheres to the Philippine National Standard PNS/BAFS/PAES 217:2017 ICS 65,060.35, following a staggered one-week schedule for rice. The cropping schedule is based on the growth phases of rice and corn.
The Blaney-Craddle Method was employed in the study to accurately compute potential evapotranspiration (PET) for optimizing the irrigation schedule. Additionally, PET was calculated using Thornthwaine’s approach, utilizing predicted weather information from the PAGASA 2024 Weather Outlook. The research aimed to enhance crop productivity and water use efficiency by tailoring irrigation techniques to the specific requirements of maize and rice crops. With well-defined guidelines and climatic projections, this systematic approach ensures sustainable agricultural practices.