Photovoltaic panels can convert solar energy directly into electricity, but their efficiency declines as the panels' temperature rise. To solve this problem, Photovoltaic thermal (PVT) systems have been developed to enhance power energy generation from Photovoltaic panels. This research presents the daily and monthly global solar radiation on a horizontal surface in Iraq and applies it to the PVT water system. The thesis contributes in two ways: first, it models a novel copper pipe system that improves thermal efficiency in an actual environment, and second, it investigates the hourly and daily intensity of solar radiation in Iraq. Using collected irradiation at mass flow rates ranging from 0.01 and to 0.02 kg per second, the surface temperature of the PVT model was calculated. Using the experimental data, the surface temperature was also computed in the PVT model. The findings were essentially consistent with those of prior investigations. A PVT system with a constant input temperature is employed to raise the surface temperature throughout simulated testing. This research considers the four unique seasons' weather conditions. With an optimal mass flow rate of 0.02 kg/s and a constant low input temperature, the findings demonstrate the thermal efficiency of the PVT.