During the experiments, several parameters are measured in order to evaluate the system performance. The quantities needed to be measured are, the temperatures at different points of the stills (brine and glass cover temperatures), ambient temperature, total solar radiation, wind velocity and the amount of distillate. The temperatures have been measured using calibrated copper constantan type thermocouples (±1C) which were connected to a digital temperature indicator. Total insolation was measured on the same level of stills glass covers with the help of a Data logging solar power meter ranged of 0-5000 W/m2 with an accuracy of ±1 W/m2. Wind speed was measured with the help of a van type anemometer, ranged of 0.4 - 30 m/s with an accuracy of ± 0.1 m/s. A flask of 2 liter capacity (an accuracy of 5 ml) was used to measure the hourly yield.
Based on the accuracy of each measuring instrument, an estimate of the uncertainty in measurements has been carried out following the procedure explained by Kline & McClintock. It has been found out that the maximum uncertainty in the measurements is about 2 %.
During the experiments, several parameters are measured in order to evaluate the system performance. The quantities needed to be measured are, the temperatures at different points of the stills (brine and glass cover temperatures), ambient temperature, total solar radiation, wind velocity and the amount of distillate. The temperatures have been measured using calibrated copper constantan type thermocouples (±1C) which were connected to a digital temperature indicator. Total insolation was measured on the same level of stills glass covers with the help of a Data logging solar power meter ranged of 0-5000 W/m2 with an accuracy of ±1 W/m2. Wind speed was measured with the help of a van type anemometer, ranged of 0.4 - 30 m/s with an accuracy of ± 0.1 m/s. A flask of 2 liter capacity (an accuracy of 5 ml) was used to measure the hourly yield.
Based on the accuracy of each measuring instrument, an estimate of the uncertainty in measurements has been carried out following the procedure explained by Kline & McClintock. It has been found out that the maximum uncertainty in the measurements is about 2 %.
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