Experimental Study of Small Scale Drip Irrigation Using Positive Displacement Solar Pump in Direct Coupling Conditions

In this paper, experimental performance of a solar photovoltaic positive displacement pump connected to drip irrigation system has been studied in direct coupling condition. Also, a mathematical model has been presented to predict the main parameters of the system. The values ​​of solar radiation, water discharge, emitter line pressure, panel surface temperature, ambient temperature, current and output voltage of solar panel have been measured in actual operation time. The results illustrate that the positive displacement pump discharge shows three different behaviors in a day. The output flow of the pump tends to be constant after a mid-day threshold radiation. The amount of discharge and line pressure in the morning and evening, when the sun radiation is in a low level, are ascending and descending, respectively. One of the important factors in the performance of the panel is the surface temperature of the panel, with the maximum observed temperature being 60.7 degrees Celsius.