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The Heat Transfer Coefficient (HTC, h) is critical for evaluating the thermal performance of Trombe Walls (TW), passive solar heating systems that utilize solar energy for space heating. This study analyzes convective and radiative HTC mechanisms on a TW absorber surface, emphasizing factors such as airflow patterns, surface roughness, temperature gradients, emissivity, and environmental conditions (solar radiation, ambient temperature, wind speed). Experimental and numerical methods were applied to quantify HTC f...