Radiation angle factor calculation between human body and radiant panel by contour integral method

Radiation angle factor is an important parameter for calculating the radiation heat transfer between human body and radiant panel. In view of the complexity of radiation angle factors between human body and radiant panel, considers the shape of a standing human body as a cuboid to calculate radiation angle factors. Takes the radiant ceiling for example, establishes basic mathematical expressions of radiation angle factor between human body and radiant panel by using contour integral method and algebraic method, and verifies the reasonability of  the results.