An experimentally validated, transient model for sheet and tube PVT collector

The simulation results fount to be in good agreement with experimental data. In more details, the RMS deviation for collector's outlet temperature was estimated to 0.66% for stable weather conditions and to 4.22% for extremely transient conditions with sporadic showers. Also, the discrepancy for power generation fount to be 5.05% and 14.91% for stable and transient weather conditions respectively. Moreover, for unstable weather without rain but with abrupt changes on flow-rate, the model found at sufficient accuracy with RMS deviation of 2.06% for water outlet temperature and 4.15% for power generation. Finally, by considering the absorber's heat inertia on the collector energy balance equation, a positive contribution on model's accuracy can be obtained, contrary to the steady-state version.