ASHRAE-Standard-55 - Page 015

Extracted Content

Table 5-5 High-Performance (Low-e) Glazing Units

Representative Occupant Distance from Interior Window or Shade Surface, ft (m)	Fraction of Body Exposed to Sun (f ), bes %	Glazing Unit Total Solar Transmission (T ), % sol	Glazing Unit Indirect SHGC (SHGC – T ), % sol	Interior Shade Openness Factor, %	Interior Shade Solar Absorptance of Window-Facing Side, %
4.8 (1.5)	50	35	4.5	9	65
5.1 (1.6)	100	35	4.5	5	65

Table 5-6 Clear, Low-Performance Glazing Units

Representative Occupant Distance from Interior Window or Shade Surface, ft (m)	Fraction of Body Exposed to Sun (f ), bes %	Glazing Unit Total Solar Transmission (T ), % sol	Glazing Unit Indirect SHGC (SHGC – T ), sol %	Interior Shade Openness Factor, %	Interior Shade Solar Absorptance of Window-Facing Side, %
11.0 (3.3)	50	83	10	1	25
14.5 (4.4)	50	83	10	1	65
12.2 (3.7)	100	83	10	1	25
15.9 (4.9)	100	83	10	1	65

Table 5-7 Tinted Glazing Units	Col2	Col3	Col4	Col5	Col6
Representative Occupant Distance from Interior Window or Shade Surface, ft (m)	Fraction of Body Exposed to Sun (****fbes), %	Glazing Unit Total Solar Transmission (****Tsol), %	Glazing Unit Indirect SHGC (SHGC –****Tsol), %	Interior Shade Openness Factor, %	Interior Shade Solar Absorptance of Window-Facing Side, %
5.3 (1.6)	50	10	20	8	25
6.1 (1.9)	50	10	20	1	65
5.9 (1.8)	100	10	20	1	25
7.4 (2.3)	100	10	20	1	65
>7.3 (2.2)	50	<15	8	No shade	No shade

Table 5-8 Dynamic Glazing Units (Increasing Tsol Represents Decreasing Tint)

Representative Occupant Distance from Interior Window or Shade Surface, ft (m)	Fraction of Body Exposed to Sun (f ), bes %	Glazing Unit Total Solar Transmission (T ), % sol	Glazing Unit Indirect SHGC (SHGC – T ), % sol	Interior Shade Openness Factor, %	Interior Shade Solar Absorptance of Window-Facing Side, %
6.1 (1.9)	50	0.5	10	N/A	No shade
6.1 (1.9)	100	0.5	10	N/A	No shade
7.9 (2.4)	50	3	10	N/A	No shade
9.5 (2.9)	100	3	10	N/A	No shade
9.8 (3.0)	50	6	10	N/A	No shade
10.3 (3.1)	50	9	10	N/A	No shade

Table 5-9 Interior Shade Solar Absorptance Based on Color Description of Window-Facing Side of Shade

Solar Absorptance, %	<15	15 to 25	25 to 65	>65
Color Description	White	Silver, cornsilk, wheat, oyster, beige, pearl	Beige, pewter, smoke, pebble, stone, pearl grey, light grey	Charcoal, graphite, chestnut

ANSI/ASHRAE Standard 55-2023 13