Substantiation of Parameters and Operation Modes of Device for Thermal Comfort of a Mobile Machine Operator

The effects of heat and cold on the human body lead to a reduction in its protective power and reserve capacity. The productivity of operators is reduced by 25∼55% with ambient temperature increasing up to 28∼31°C. It is proved that the temperature and human performance have a strong correlation. The process of forming the thermal state of the human operators in the cabs of mobile machines is still to be understood by automotive engineers. On the basis of theoretical research, we have identified the main factors influencing the thermal state of the human body, justified the blueprint and design parameters of the proposed device for thermal regulation. There is a power dependence of heat flux on the thickness of the operator's clothes, the power, and distance of their body from the local device. When experimenting with the relationships between the human operator's thermal state (thermal sensation) indicator and the parameters of microclimate in the mobile machine cabs, we considered the operating modes of the device. Experimental studies were carried out in a climatic chamber based on a unified cabin. The experiments determined the value of the power density of the heat flow. It amounted to 486 watts; this will be needed in the future to calculate the constructive and regime parameters of the proposed device.