Numerical study on dynamic heat transfer characteristics of the human body in decoupled radiant cooling space

Low-temperature radiant temperatures below the dew point can now be used in hot and humid areas thanks to decoupled radiant cooling technology. In high-temperature, high-humidity air settings, condensation-free low-temperature radiant cooling has been made possible by the materials with high infrared transmittance. It is yet unknown how the human body transfers heat dynamically in low-temperature radiant cooling environments. Thus, a transient heat transport model of the human body in three dimensions was created and validated. In a thermal setting with low-temperature radiation, the dynamic process of the human body was examined. Under low-temperature radiant conditions, the variations in the body’s heat flux and skin temperature were examined. According to the findings, the radiant heat flux on the human body’s upper torso can reach 49 W/m² and the ratio of radiant heat flux can approach 70% once steady-state conditions are met. The human body can reach thermal equilibrium through radiant heat transfer using a low-temperature radiant panel when the initial air temperature is 32 °C and the radiant cooling panel’s temperature is 5 °C. This is possible when the human body’s surface heat flux density is 70 W/m².