The Technical Engineering College / Mosul examined the technical master’s thesis in the specialization of Refrigeration Engineering Technologies, submitted by the researcher Omar Younis Hamada Omar, entitled:

“An Experimental Study on the Performance of a Water-Based PVT Solar Collector Integrated with Phase Change Materials (PCM).”

The thesis demonstrated that an increase in the temperature of photovoltaic cells leads to a reduction in their electrical efficiency, and that integrating photovoltaic–thermal (PVT) systems with solar thermal collectors (STC) represents an effective solution for dual utilization of solar energy (thermal and electrical). The study also showed that the use of phase change materials (PCM) and a porous medium within the STC significantly extends thermal storage duration and enhances temperature stability, particularly during periods of reduced solar radiation.

The main objective of the research was to experimentally investigate the performance of a hybrid PVT–STC solar system operating with both water and air, and to analyze the effects of water and air flow rates on outlet temperatures, thermal efficiency, electrical efficiency, and total energy production under the local climatic conditions of the city of Mosul. The study further focused on evaluating the role of thermal energy storage using paraffin wax and a porous medium in improving system efficiency during low solar irradiance periods.

The results indicated that the proposed hybrid system achieved a noticeable improvement in water and air heating while simultaneously generating electrical power. An increase in water flow rate was found to enhance electrical efficiency by reducing the temperature of the photovoltaic cells, whereas lower flow rates contributed to higher outlet temperatures. Accordingly, the thesis recommended adopting integrated PVT–STC systems with thermal energy storage as a practical and efficient solution for solar energy applications in hot regions.

The examination committee consisted of the following members:

• Prof. Dr. Thamer Khalaf Salim – Chairperson

• Assoc. Prof. Dr. Nabil Mukhlif Abdulrazzaq – Member

• Assoc. Prof. Dr. Harith Maher Abd – Member

• Prof. Dr. Omar Rafi‘ Mahmoud – Member and Supervisor