Abstract
Performance of solar photovoltaic water pumping units relies on available solar radiations of the area, geographical conditions and system configurations. This study was conducted to analyze the influence of solar radiation, motor speed and water head on water discharge of a solar water pumping systems (SWPS). For that, a SWPS was installed, configured and its performance was examined at Sadiqabad Colony, Nawabshah for two consecutive months from 12:00 to 13:00 hours. Light meter, Model- HDS 2302.0, Delta OHM was used for measurement of global solar radiation, PROVA-RM 1000 tachometer for motor pump speed and stopwatch for recording of elapsed time for filling up of 30 liters capacity water can. Results revealed that the average minimum solar radiations were 776 W/m2 at 12:00 hours in the month of May and maximum 902 W/m2 at 13:00 hours in the month of June during experimental work. The maximum average motor speed and flow rate were noted at L1 and minimum at L4, whereas, the maximum time taken by the solar water pumping system for filling up of water can at L4 and minimum at L1. The time taken to provide one liter of water was found inversely proportional with motor speed and directly with the water head.
Highlights
Solar energy is one of the key alternative, renewable and viable energy resources in the world [1]
The study results include solar radiation and performance parameters, like motor speed, time taken by the solar water pumping systems (SWPS) to fill up the 30 liters capacity can at different levels and water flow rate
The time taken to provide one liter of water was found inversely proportional with motor speed and directly with the water head
Summary
Solar energy is one of the key alternative, renewable and viable energy resources in the world [1]. It is green technology resource, nature-friendly, does not produce emissions that cause greenhouse effect or destroy the ecological balance. It is omnipresent, safe, abundant and freely available [2-4]. Pakistan receives about 1kW/m2/day of global solar radiations for 6 to 7 hours. The number of sunshine hours per year in the country is nearly 3000 to 3300 [5]. There are two ways to use solar energy, namely indirectly through the use of thermal systems and directly via photovoltaic (PV) modules. The applications of solar energy include power generation, solar water pumping, water heating and cooling, street lighting and rural electrification [2, 4, 6]
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