Overview
Three-year hourly field data for eight
installed systems in Jordan
have been analyzed. Based on two seconds scanning rate, hourly, daily, monthly
and yearly averages of in-plane insolation and its frequency distribution for
seven locations are presented and discussed. In-plane insolation is compared
with insolation on a horizontal plane for a sample location. PV array efficiencies
for the eight systems are presented. Instantaneous, average and best results of
performance ratios are obtained. Actual oversizing factors of the systems have
been determined. The effect of insolation, time of day, ambient temperature, cell
temperature and wind speed on PV array yield are determined. The effect of ambient temperature, insolation and wind speed on the PV cell temperature is determined. A new model for cell temperature
as a function of insolation and ambient temperature is developed, compared with
another model and validated.
Sample Data
Figure 1. Daily total insolation on
horizontal plane over a three-year period
Figure 2. Variation of cell temperature with insolation
Figure 3. Variation of cell temperature with ambient temperature
