Direct and diffuse irradiances on a horizontal surface measured during 30 years period at the meteorological station in Warsaw (Bielany) and averaged in a special way [2] have been used as input data for simulation of solar energy availability at the Research Center Jablonna. These averaged input solar data are presented in Fig.2.

Building envelope constitutes opaque and transparent surfaces with different orientation and inclination. The location of these surfaces causes different availability of solar radiation and in consequence influences in different way on the magnitude of solar energy incident on surfaces under consideration. Solar hourly irradiations on tilted surfaces with different orientation that constitute the envelope of the EDI building of the Research Center Jablonna have been calculated using the anisotropic diffuse solar radiation model described in mathematical way by the HDKR model [4]. The results of calculations are presented for some selected cases of surfaces orientation and inclination [3], that have been under special consideration because of their probably application (location) in the EDI building envelope.

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The analysis of availability of solar radiation on surfaces with different orientation and inclination gives indications for shaping the building envelope.