Psychrometric Functions Resume

8/12/2019 Psychrometric Functions Resume

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Dry bulb temperature tdb °C Absolute humi

Relative humidity f % Specific volum

Height above sea level H m.a.s.l. Density

Maximum values for the input parameters - At altitudes above sea level

tdbMax = 96 °C the dry bulb temperature, rela

f Max = 50 % range limitations are required

Hmax = 5300 m.a.s.l. - The numbers in square bra

Group 1 Group 2

tdb, f , H tdb, twb, H

tdb ºC tdb 37.80 °C tdb 37.8

f % f 31.5 % f 31.4

H m s.n.m. H 10.0 m H 10.0

x kg/kg x 0.01294 [11] x 0.0129

v m3/kg v 0.900 [12] v 0.900

r kg/m3 r 1.125 [13] r 1.125

tdp ºC tdp 17.82 [14] tdp 17.82

ent kJ/kg ent 71.1 [15] ent 71.0

twb ºC twb 23.88 [16] twb 23.88



ity x kg w/kg da Dew point temperature tdp

v m3/kg da Specific enthalpy ent

r kg /m3 Wet bulb temperature twb

with, "H < Hmax", the routine can handle relative humidities "f" greater than the given value "fMax". Th

tive humidity and height above sea level, are defined in order to obtain an acceptable maximum numb

only in the functions calculating the wet bulb temperature (functions 16, 36, 46 and 56).

kets indicate the number of the function in the VBA environment

Group 3 Group 4

tdb, x, H ent, x, H

°C tdb 37.80 °C tdb 37.80 [48]

[27] f 31.5 [37] f 31.5 [47]

m H 10.0 m H 10.0 m

[21] x 0.0129 kg/kg x 0.0129 kg/kg

[22] v 0.900 [32] v 0.900 [42]

[23] r 1.125 [33] r 1.125 [43]

[24] tdp 17.82 [34] tdp 17.82 [44]

[25] ent 71.05 [35] ent 71.05 kJ/kg

ºC twb 23.88 [36] twb 23.88 [46]

Psychrometric Functions_Resume

Groups



Rev. cjc. 21.02.2014

ºC

kJ/kg da

ºC

e maximum values of

r of iterations. These

Group 5

tdb, ent, H

tdb 37.8 °C

f 31.5 [57]

H 10.0 m

x 0.0129 [51]

v 0.900 [52]

r 1.125 [53]

tdp 17.82 [54]

ent 71.05 KJ/kg

twb 23.88 [56]

Psychrometric Functions Resume

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