Abstract
The work which is a field measuring and estimation method for the total heat loss coefficient of rooms, so called KA, has been developed by Prof. Y. Matsuo previously, and it is confirmed experimentally by the authors that the method has a good enough accuracy for the present purpose such as to estimate the total heat loss coefficient only. But also it is expected to expand the method to be able to estimate the directional heat loss coefficients separately according to each orientation. In this paper, it was shown that authors succeeded in estimating the directional heat loss coefficients (so called K) by using the condensed orthogonal out-door weather effects, also to estimate the KA value with much higher stability than the previous method.
