Mathematical Modeling of Double-Skin Facade in Northern Area of China

Table 7

The contrast of the ratio of energy conversion when the building orientation is changed.

Building orientation	The energy saving ratio of the DSF (%)	Reference to Low-e hollow glass curtain wall	Reference to concrete-perlites-85
Northward	Heat energy saving rate	8.0	−9.0
	Air conditioning energy saving rate	21.3	−44.9
	Annual energy saving rate	16.1	−31.3
Westward	Heat energy saving rate	9.5	−7.3
	Air conditioning energy saving rate	28.2	−36.8
	Annual energy saving rate	21.3	−23.0
Southward	Heat energy saving rate	6.3	−10.2
	Air conditioning energy saving rate	26.3	−43.7
	Annual energy saving rate	16.0	−31.0
Eastward	Heat energy saving rate	10.1	−6.2
	Air conditioning energy saving rate	23.7	−41.8
	Annual energy saving rate	18.9	−26.4