The radiant time factors are used to calculate radiant cooling load in the radiant time series method. Based on measurement data of hourly heat gain and cooling load collected within 24 hours,radiant heat gain and radiant cooling load can be calculated by separating convection with radiation. Transfer function is obtained and a 24 term radiant time factors can be calculated by transfer function coefficients matrix. By comparing the results with experiment,it shows that the calculation method of radiant time...