The effects of drying parameters on the volumetric heat transfer coefficient during rotary drying of coir pith were experimentally investigated using a pilot-scale rotary dryer. Experiments were conducted at a constant inlet air temperature of 55 ℃, varying the inlet air velocity (0.2 m/s, 0.3 m/s, and 0.4 m/s) and feed rate (0.67 L/min, 1 L/min, and 2 L/min), while maintaining constant rotational speed and relative humidity. To assess the effect of temperature, addi-tional tests were performed by varying inlet air temperature (55 ℃, 70 ℃, and 80 ℃) at a constant air velocity (0.3 m/s) and feed rate (1 L/min). The results confirm that the inlet air temperature is the dominant factor influencing the vol-umetric heat transfer coefficient, with its impact becoming more significant at elevated temperatures. An empirical model was developed to predict the volu-metric heat transfer coefficient as a function of inlet air temperature, air veloci-ty, and feed rate. Statistical analysis showed that inlet air temperature had a sig-nificant effect (p = 0.029), whereas air velocity and feed rate were less influen-tial. The model demonstrated a strong predictive capability, with good agree-ment between experimental and predicted values (R2 = 0.894), further support-ed by residual analysis. These results highlight the potential applicability of the developed model for the design and optimization of rotary drying processes in industrial applications.