Novosibirsk State Technical University has developed a program for calculating the human thermoregulation system, taking into account the thermal resistance of protective clothing at low temperatures. The software, which received a certificate for computer programs in October 2025, is designed to study thermal processes in the body under extreme (emergency) external conditions.
The Department of Technical Thermophysics of the Faculty of Aircraft of NSTU-NETI presented a unique program for calculating the operating characteristics of the human thermoregulation system at low temperatures. For the simulation, the human body was "divided" into separate cylinder elements: arms, legs, chest, abdominal area with internal organs. In addition, three layers are taken into account in each of the elements — muscles, the fat layer and the network of subcutaneous capillaries, which are involved in the thermoregulation process.
The resistance of thermal protective clothing was modeled as the fourth layer. For calculations, an unsteady system of equations of thermal balance, heat transfer and thermal conductivity for heat exchange with the environment has been compiled. As a result of calculations, the temperatures of the layers at the joints between them, the heat losses of the elements during the cooling process were determined depending on gender, age, individual body parameters, physical activity, thermal resistance of clothing at different temperatures and speeds of air and water movement.
The program allowed us to carry out a wide range of studies on cooling in air with temperatures of -50...0 °C and water in the range of 0...20 °C. Cooling of humans in cryosauna conditions — nitrogen vapor with a temperature of -150 °C - was studied separately. This technology is used for the rapid rehabilitation of athletes, pilots and astronauts after intense physical exertion.
The uniqueness of the software was appreciated by colleagues from the Moscow Aviation Institute, in particular, they noted a multi-element and multi-layered approach for calculating the human thermoregulation system, which allows us to study heat losses for various body tissues. According to Alexander Chichindaev, Professor of the Department of Technical Thermophysics at NSTU-NETI, Doctor of Technical Sciences, the program can be useful for specialists in the field of life support systems in the study and design of human thermal protection in the Far North, emergency landing of pilots and cosmonauts, and the development of cosmonaut spacesuits.
Earlier, the Department of Technical Thermophysics presented an innovative program for calculating the human circulatory system, taking into account age, gender, type of motor activity and morphological properties of the body — aorta, arteries, arterioles and capillaries. Special attention was paid to the study of the effect of blood rotation on the functioning of the circulatory system.