ASHRAE-Standard-55 - Page 039
Extracted Content
Table D-1 Validation Table for SET Computer Model (for a standing person)
| Temperature | MRT | Air Speed | RH | met | clo | SET |
|---|---|---|---|---|---|---|
| °C °F | °C °F | m/s fpm | % | % | % | °C °F |
| 25 77 0 32 10 50 15 59 20 68 30 86 40 104 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 | 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 25 77 10 50 40 104 25 77 25 77 25 77 25 77 25 77 25 77 25 77 | 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.1 19.7 0.6 118.1 1.1 216.5 3 590.6 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 0.15 29.5 | 50 50 50 50 50 50 50 10 90 50 50 50 50 50 50 50 50 50 50 50 50 50 | 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.8 2 4 | 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.1 1 2 4 0.5 0.5 0.5 | 23.8 74.9 12.1 53.7 16.8 62.3 19.2 66.5 21.5 70.7 26.4 79.5 34.1 93.8 23.3 73.9 24.8 76.6 24.0 75.2 21.3 70.4 20.2 68.4 18.7 65.6 15.3 59.6 31.6 88.9 20.7 69.3 27.2 81.0 32.4 90.3 37.8 99.7 23.3 73.9 25.9 78.7 30.4 86.8 |
D4. COMPUTER PROGRAM FOR CALCULATION OF SET
The following code is one implementation of the SET calculation using JavaScript in SI units. If the following code is used to calculate the cooling effect as described in Normative Appendix D, the input parameter CALCULATE_CE should be set equal to “true.” Alternatively, if it is used to calculate the SET temperature, CALCULATE_CE should be set to “false.”
FindSaturatedVaporPressureTorr = function(T) {
/* Helper function for pierceSET calculates Saturated Vapor Pres
sure(Torr)at Temperature T (°C) */
return Math.exp(18.6686 - 4030.183/(T + 235.0)); } pierceSET = function(TA, TR, VEL, RH, MET, CLO, WME, PATM,
CALCULATE_CE=false, BODY_POSITION) {
/* Input variables - TA (air temperature): °C,
TR (mean radiant temperature): °C, VEL (air speed): m/s, RH (relative humidity): %, MET: met unit CLO: clo unit WME (external work): W/m [2], PATM (atmospheric pressure): kPa BODY_POSITION (body position): “sitting or standing”*/
ANSI/ASHRAE Standard 55-2023 37