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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




                                                  Page 1
                                     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


                                 Page 2
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




  Page 6
                                           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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