ASHRAE-Standard-55 - Page 034
Extracted Content
Figure C-3 Solar horizontal angle relative to the front of the person (SHARP) and solar altitude .
Table C-3 Sky Vault View Fraction fsvv for Single-Sided Window Geometry and Occupant Location
| Window Width, ft (m) | 30 (9.1) | 150 (45.5) | 30 (9.1) | 150 (45.5) | 30 (9.1) | 150 (45.5) | 30 (9.1) | 150 (45.5) | 6 (1.8) | 6 (1.8) | 6 (1.8) | 4 (1.2) | 4 (1.2) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Window Height, ft (m) | 10 (3) | 10 (3) | 6 (1.8) | 6 (1.8) | 10 (3) | 10 (3) | 6 (1.8) | 6 (1.8) | 9 (2.7) | 6 (1.8) | 6 (1.8) | 4 (1.2) | 4 (1.2) |
| Distance from Window to Occupant, ft (m) | 3.3 (1) | 3.3 (1) | 3.3 (1) | 3.3 (1) | 6 (1.8) | 6 (1.8) | 6 (1.8) | 6 (1.8) | 3.3 (1) | 3.3 (1) | 6 (1.8) | 3.3 (1) | 6 (1.8) |
| Fsvv | 27% | 31% | 20% | 23% | 17% | 21% | 11% | 14% | 14% | 11% | 4% | 6% | 2% |
Table C-4 Direct-Beam Solar Radiation Values for a Standard Cloudless Atmosphere, by Solar Altitude
| 5 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
|---|---|---|---|---|---|---|---|---|
| 210 | 390 | 620 | 740 | 810 | 860 | 890 | 910 | 920 |
C3. COMPUTER PROGRAM FOR CALCULATING COMFORT IMPACT OF SOLAR GAIN ON OCCUPANTS
The following code is one implementation of the solar calculation using JavaScript in SI units.
function find_span(arr, x){
/* For ordered array arr and value x, find the left index of the
closed interval that the value falls in. */
for (var i = 0; i < arr.length - 1; i++){
if (x <= arr[i+1] && x >= arr[i]){ return i; } } return -1; }
32 ANSI/ASHRAE Standard 55-2023