Testing of natural convection heat transfer performance of electric heaters under lower air pressure

Theoretically analyses the relations between the surface coefficient of heat transfer and air pressure. Experimentally tests the heat transfer performance under lower air pressure and normal air pressure. Concludes that the ratio of surface heat transfer coefficients under lower air pressure to that under normal air pressure is in direct proportion to 0.2 power of the ratio of lower air pressure value to normal air pressure value, that the heat emission power under lower air pressure is almost equal to that under normal air pressure, and that the surface temperature rises when air pressure falls.