This study investigated the performance of a solar chimney window equipped with a PV-powered fan (SCW-PV) in reducing heat gain and improving ventilation in buildings. The research methodology involved comparative testing of two houses: one with a common glazed window (reference) and the other with the SCW-PV installed. The SCW-PV consisted of two glass layers with an aluminum frame, vents at the top and bottom, and a DC fan connected to a PV panel without a battery. This field test investigated the variables of temperature and heat transfer reduction, with data collected during daytime hours on clear-sky days. Temperature, heat flux, and air velocity sensors were calibrated and recorded the data. Results showed that the SCW-PV effectively lowered the room space temperature compared to the common glazed window, reducing window heat gain by 10-20 W/m2 (15-55% reduction). The ventilation rate through the SCW-PV ranged from 15-50 m3/h, corresponding to 5.2-17.4 air changes per hour (ACH) in the 2.88 m3 room. The findings suggest that the SCW-PV is a significant tool for reducing window heat gain, minimizing heat accumulation in room spaces, and improving indoor thermal comfort. Therefore, the SCW-PV is recommended for implementation in buildings to enhance energy efficiency and occupant comfort. GRAPHICAL ABSTRACT HIGHLIGHTS • Heat Gain Reduction: Achieved a 10-20 W/m² reduction in window heat gain, equating to a 15-55% decrease.• Ventilation Improvement: Ventilation rate through the SCW-PV ranged from 15-50 m³/h, resulting in 5.2-17.4 air changes per hour (ACH) in a 2.88 m³ room.

In the present research, an investigational study on thermal performance of a mixed asphalt conical solar water heater (MACSWH) was analyzed under field conditions. The key target of the present research is to evaluate the dynamics of heat and performance of a conical solar collector with an attached mixed asphalt as an absorber plate. In the current experimental test setup, the mixed asphalt as an absorber plate with a diameter of 0.20 m and thickness of 0.05 m was set in the middle of the focal area for accumulating the solar radiation, reflecting from a polished zinc conical reflector. The aperture diameter of the MACSWH was 0.45 m with a concentration ratio of 2.20. The copper pipe had a total length of 2 m, and the inclination angle of the conical was fixed at 15 deg. The experimental results provide evidence that the mixed asphalt set as an absorber plate at the center of the focal area was an effective practical approach to improve the performance of a conical solar collector. This method raises the maximum percentage difference between inlet water temperature and outlet water temperature by approximately 47.27%, while the maximum temperatures of absorber plate, copper pipe, and efficacy are at 82 °C, 62 °C, and 72%, respectively.