Performance evaluation of solar power-driven pump irrigation at Quezon, Nueva Ecija
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Date
2024
Authors
Vincent James O. Villanueva
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Abstract
The study evaluated the efficiency of the solar power-driven pump irrigation system in Quezon, Nueva Ecija. The performance evaluation of a solar power-driven pump irrigation consists of three trials. The first trial begins at 9:00 am and ends at 9:30 am; the second trial begins at 12:00 p.m and ends at 12:30 p.m.; and the third trial begins at 3:00 p.m. The ambient condition, PV temperature, solar array, solar input and output, and discharge data were gathered every 1 minute for a total of 30 minutes. The materials used in the research included measuring tape, a temperature humidity meter for ambient conditions, an infrared thermometer for PV temperature, a clamp-meter for voltage and ampere measurements, a camera for documentation and a static water level meter for drawdown. The average of three trials in ambient conditions was 34.47oC and 29.24% RH, solar radiation was 514.95 W/m2, PV temperature was 45.03oC, solar input voltage was 530.92V and ampere was 7.43A, solar output voltage was 283.91V and ampere was 8.02, and discharge was 31,621.56 L/h. the data acquired throughout the evaluation was required to calculate the total head and system efficiency. The first was determining the velocity through pipe that has 1.77 m/s, 1.76 m/s and 1.71 m/s, after that Reynolds number formula was used that has 177,443.60, with this the data was combined as turbulent flow, then after that identify the friction coefficient using the moody diagram. After gathering the data, the head loss for trial 1 to trial 3 was 0.62m and 0.58m. After computing the total head loss of trial 3, the value was 16.03m, 16.02m and 15.98. With these values, we were able to compute for system efficiencies, in trial 1 the pump efficiency was 60%, and system efficiency was 6%, for trial 2 the pump efficiency was 58.67% and 6.47% for system efficiency, and for trial 3 the pump efficiency was 66.57% with 13.8% system efficiency.
The water drawdown was determined before and after the pump operation by the used of solinst 101 P2 water level meter. There are 3 surrounding wells at SPIS from Quezon, nueva Ecija, the measuring of water level started at 8:00 am before the SPIS starts operating, the initial values for water level which measured in mbgs ( meters below ground surface) was 2.255 mbgs for the 1st well, the 2nd well has 2.265 mbgs, and 3rd well was measured at 2.47, this well varies in elevation and distance from the SPIS. The final measurement of water level was conducted at 4:00pm with following values of 2.99 in the 1st well, 294 in the 2nd well, and 2.77 in the 3rd well. The difference between the 1st well was 0.74 mbgs, for 2nd well value at 0.51 mbgs, and for 3rd well was 0.30 mbgs. Thus indicating a declination of water level from the water table during the pumping period.