ASHRAE STANDARD - 55R

BSR/ASHRAE Standard 55P, Thermal Environmental Conditions for Human Occupancy 2/24/03
Third Public Review Draft (Independent Substantive Changes to the Second Public Review)
}
HCN=2.38f*POWSP(ABSSP(100*XF-TAA),.25f);
if (HCF>HCN)
HC=HCF;
else
HC=HCN;
XN=(P4+P1*HC-P2*POWSP(XF,4))/(100.f+P3*HC);
nIterations++;
if (nIterations>1 && ABSSP(XN-XF) OneMet)
PM4 = .42f * (MW-OneMet);
else
PM4 = 0.f;
PM5 = 3.05f*.001f*(5733.f-6.99f*MW-PressureInPascals);
PM6 = 1.7f * .00001f * M * (5867.f-PressureInPascals) + .0014f * M * (34.f-
Conditions.AirTemperature);
Results.PMV = PM3 * (MW-PM5-PM4-PM6-PM1-PM2);
TCLN = (int)(TCL*100.f)/100.f;
//---Compute PPD------------------------------------------------------
Results.PPD = 0.01f*(100.f - 95.f*EXPSP(-.03353f*POWSP(Results.PMV,4)-
.2179f*POWSP(Results.PMV,2)));
}
else
return -1;
return 0;
}
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