# Download - University of Colorado at Boulder by liwenting

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```									                                                     Psych

Altitude =      5400 ft.
Pressure =    0.8187 atm        (Atmospheric pressure at given altitude and 68°F)

Points on Psychrometric Chart      Example Calculations
T          W                       h        RH            v
80     0.0110               #NAME? #NAME?          #NAME?
55     0.0090               #NAME? #NAME?          #NAME?
100     0.0160               #NAME? #NAME?          #NAME?

This module contains the following psychrometric functions:
As configured here, pressures are expected in atmospheres,
relative humidities are expected as fractions, and
temperatures as °F
FUNCTION              CALCULATES
SatPress(T)         Saturation pressure
SatTemp(Ps)           Saturation temperature
HumRatRH(T,RH,PAtm) Humidity ratio
RelHum(T,W,PAtm)         Relative humidity
Enthalpy(T,W)         Enthalpy
DewPoint(W,PAtm)         Dew-point temperature
WetBulb(T,W,PAtm)        Wet-bulb temperature
SpecVol(T,W,PAtm)         Specific volume
HumRatH(T,H)           Humidity ratio
TempH(W,H)             Temperature
RHTwb(T,TWB,PAtm)          Relative humidity
HumRatTwb(T,TWB,PAtm) Humidity ratio
HfgWat(T)           Heat of vaporization of water
TAdp(T1,W1,T2,W2,PAtm) Apparatus dew-point temperature

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Chart

Psychrometric Chart, 5400 ft.

0.0400

0.0350

0.0300

Humidity Ratio
0.0250

0.0200

0.0150

0.0100

0.0050

0.0000
30   40   50   60         70          80     90   100   110
Temperature, F

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Temperature   Humidity
30    #NAME?
35    #NAME?
40    #NAME?
45    #NAME?
50    #NAME?
55    #NAME?
60    #NAME?
65    #NAME?
70    #NAME?
75    #NAME?
80    #NAME?
85    #NAME?
90    #NAME?
95    #NAME?
100    #NAME?
105    #NAME?
110    #NAME?
Thermal Comfort
Altitude (ft)                       0
Atmospheric Pressure (atm)     1.0000

Metabolic Rate (met)                1        Air Temperature (F)                  80
Clothing Level (clo)              0.6        Air Relative Humidity (%)            60
Air Velocity (fpm)                 30        PMV                             #NAME?
MRT - TAir (F)                      2        PPD                             #NAME?

This chart gives the
0.03
percentage of
people dissatisfied         Percent Dissatisfied                   0.028
(PPD) over a range
0.026
of indoor air
temperature and                                                    0.024
humidity levels. The
calculations are                                                   0.022              90-100
based on the
metabolic rate,                                                                       80-90
0.02
clothing level, air                                                                   70-80
velocity, and radiant                                              0.018
temperature                                                                           60-70
difference given                                                   0.016              50-60
above.                                                                     Humidity
0.014              40-50
0.012              30-40
20-30
0.01
10-20
0.008              0-10
0.006
0.004
0.002
0
66 68 70 72 74 76 78 80 82 84 86
Temperature (F)
90-100
80-90
70-80
60-70
50-60
40-50
30-40
20-30
10-20
0-10
PPDSheet

WSat       #NAME?    #NAME?    #NAME?    #NAME?
66        68        70        72
0   #NAME?    #NAME?    #NAME?    #NAME?
0.002   #NAME?    #NAME?    #NAME?    #NAME?
0.004   #NAME?    #NAME?    #NAME?    #NAME?
0.006   #NAME?    #NAME?    #NAME?    #NAME?
0.008   #NAME?    #NAME?    #NAME?    #NAME?
0.01   #NAME?    #NAME?    #NAME?    #NAME?
0.012   #NAME?    #NAME?    #NAME?    #NAME?
0.014   #NAME?    #NAME?    #NAME?    #NAME?
0.016       999       999   #NAME?    #NAME?
0.018       999       999       999       999
0.02       999       999       999       999
0.022       999       999       999       999
0.024       999       999       999       999
0.026       999       999       999       999
0.028       999       999       999       999
0.03       999       999       999       999

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PPDSheet

#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
74        76        78        80        82        84        86
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
#NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
999       999   #NAME?    #NAME?    #NAME?    #NAME?    #NAME?
999       999       999   #NAME?    #NAME?    #NAME?    #NAME?
999       999       999       999   #NAME?    #NAME?    #NAME?
999       999       999       999       999       999   #NAME?
999       999       999       999       999       999       999
999       999       999       999       999       999       999

Page 7

```
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