ZEMCH 2019 International Conference Proceedings April.2020 | Page 390
Figure 4. Variations of equivalent thermal efficiency against day hours.
Figure 5. Variations of useful thermal energy against day hours.
For the purpose of dual‐fluid PV/T system evaluation and optimization, the exergy analysis is also
taken into consideration, which can provide detailed insight into process for possible improvement of
system performance. In other words, the exergy analysis gives an idea about maximum amount of
output that is achievable from the proposed PV/T system. Figure 6 shows the variations of overall
oxergy efficiency with respect to time of the day. It can be seen that the exergy efficiency varies linearly
with the daily sunlight and depicted the maximum value for both cases at the peak sun intensity hours.
The maximum exergy efficiencies for the glass to glass case and glass to tedlar case are 15.11% and
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ZEMCH 2019 International Conference l Seoul, Korea