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The human thermoregulation model COM (Complex Thermal Environment Comfort Model)was developed ， incorporat − ing the blood flow model for extremities and the conductive heat transfer model at contacting skin surfaces ． The whole body model has 17 body segments ， each consisting of 2 compartments for core and skin ． Each core compartment of extremities has artery and vein blood poo 正in its center ． The central blood compartment exchanges heat with blood pools and the tissues except extremities ． The heat balance equations for each tissue are described ． The current model is able to predict fairly weU for the body temperature distribution under unsteady state conditions ．