Influence of radiator surface emissivity on distribution of indoor mean radiant temperature

Analyses the feasibility of an alternative algorithm, which uses infinitesimal sphere formula calculating the view factor of human on the environment instead of Fanger’s graphic method. Deduces a formula calculating mean radiant temperature in the environment with the surfaces whose emissivity is less. Analyses the influences of surface emissivity on distribution of indoor mean radiant temperature under the design condition and at different surface temperatures separately. The results show that the greater the surface emissivity of radiator is, the higher mean radiant temperature near radiator is. The higher the surface temperature of radiator is, the larger the influence of surface emissivity on the distribution of mean radiant temperature is. The surface emissivity should be considered as an important parameter for both the calculation of indoor mean radiant temperature and the heating design.