Using the theory of wall thermal system, according to the characteristics of regional differences and surface characteristics differences in the outdoor boundary conditions of wall heat transfer, Lhasa, Yinchuan and Xi'an were selected as representative areas. The equivalent calculation method of the thermal parameters of the outer wall surface was discussed, and the influencing law of the solar radiation absorption coefficient on the energy saving of the south wall and the temperature of the inner wall surface under the heating condition in winter was discussed. The results show that increasing the solar absorptivity of the south wall can effectively increase the energy saving, but it will reduce the stability of the inner wall surface temperature and the fluctuation range of the inner wall surface temperature. This effect is most significant in the Lhasa area with the highest solar radiation intensity, followed by Yinchuan, followed by Xi'an, and with the increase of wall heat transfer resistance and thermal inertia index, the sensitivity of energy saving and inner wall fluctuation to solar absorptivity becomes smaller.
Key words
solar energy /
passive solar heating /
energy saving /
solar absorptivity /
equivalent calculation /
fluctuation range of inner wall temperature
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