In this study, the electrical, electrochemical and thermodynamic performance of a PV/T electrolyzer system was investigated, and the experimental results were verified with a numerical model. The annual amounts of electrical and thermal energy from the PV/T electrolyzer system were calculated as 556.8 kWh and 1912 kWh, respectively. In addition, the hydrogen production performance for the PV/T electrolyzer was compared with that of a PV electrolyzer system. The amount of hydrogen was calculated as 3.96 kg annually for the PV system, while this value was calculated as 4.49 kg for the PV/T system. Furthermore, the amount of hydrogen production was calculated as 4.59 kg for a 65 °C operation temperature. The electrical, thermal and total energy efficiencies of the PV/T system, which were obtained hourly on a daily basis, were calculated and varied between 12–13.8%, 36.1–45.2% and 49.1–58.4%, respectively. The hourly exergy analyses were also carried out on a daily basis and the results showed that the exergy efficiencies changed between 13.8–14.32%. The change in the electrolysis voltage was investigated by changing the current and temperature in the ranges of 200–1600 mA/cm2 A and 30–65 °C, respectively. While the current and the water temperature varied in the ranges of 400–2350 mA/cm2 and 28.1–45.8 °C respectively, energy efficiency and exergy efficiency were in the ranges of 57.85–69.45% and 71.1–79.7%, respectively.

ÖzetBu çalışmada, Balıkesir Üniversitesi Çağış kampüsünde kurulan hibrit fotovoltaik termal (PV/T) bir sistemin elektriksel ve termal çalışma performansları incelenmiştir. Kurulan sistemin, şebeke bağımsız olarak akülerle birlikte elektriksel çalışma performansı değerlendirilmiştir. 0.015, 0.044 ve 0.069 kg/s' lik akışkan hızlarında yapılan ölçümlerde sistemin termal veriminin %49.9 ile %52.11 arasında değiştiği görülmüştür. Ağustos ayı için, belirlenen elektriksel yük profilinde, sistemin şebeke bağımsız elektriksel performans incelemesi sonucunda akülerle yük besleme yaparken şarj durumu %40 ile %100 arasında değiştiği belirlenmiştir. Ayrıca PV/T panelin soğutmalı ve soğutmasız durumlarda elektriksel performansı incelenmiştir ve soğutma yapıldığı durumda elektriksel çıkış maksimum güç noktasında %12.9' luk bir artış belirlenmiş ve bu değerlerde elektriksel verim %12 olarak hesaplanmıştır. AbstractIn this study, electrical and thermal performances of a hybrid photovoltaic thermal system (PV/T) which built in Balıkesir University Campus area were investigated. The off-grid electrical performance of the system with batteries has been evaluated. It is found that the thermal efficiency of this system changes between 49.9% and 52.11% by the measurements in 0.015, 0.044 and 0.069 kg/s flow rates. In August, the state of * Metin GÜL, metingul@balikesir.edu.tr, http://orcid.org/0000-0001-6168-1768Ersin AKYÜZ, eakyuz@balikesir.edu.tr, http://orcid.org/0000-0001-9786-3221

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