Dynamic Coupled Electrical and Thermal Model for PV-T Solar Energy Collectors

Abstract

This paper proposes a nonlinear state space model of a hybrid Photo-Voltaic /Thermal (glazed and unglazed PV/T) system taking into account the coupling of the electrical and the hydraulic circuits. A real time behavioral model is presented as Variable Structure Automatic System (VSAS), for simulation analysis and PV/T design optimization. The proposed model is appropriate for prediction, monitoring, control and can be used for diagnosis and the system Remaining Useful Life span increase. The analysis of the energy balance of the PVT system in its environment, leads to propose a new Maximum Life Span Power Point (MLSPP) to be used instead of the simple MPP to increase the life cycle of the PVT system.

Experimental Validation of a Thermo-Electric Model of the Photovoltaic Module under Outdoor Conditions

“…In addition to validating the presented dynamic thermo-electric model, the importance of accuracy of measuring devices and optical losses is also included. Various authors [10,12,13,23,30] used constant values of optical losses in their models to determine the temperature distribution of fixed PV modules. Even though, in this paper measurements are performed on a dual-axis tracking system, the optical losses were calculated as a function of an incident angle of the Sun's rays, which is similar as in the following studies [31,32]).…”

“…It is very difficult or almost impossible to measure the temperature of the PV cell layer in various outdoor conditions. Therefore, various models have been developed in order to determine the operating temperature of PV cells with help of meteorological and experimental data [11][12][13][14][15]. In addition to meteorological data, operating temperature of the PV module is also influenced by the type of materials and operation PowerPoint at which the PV module operates.…”