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1
. Humid Air Properties
2
. Heating / Cooling
3
. Mixing
Input Data
Select
f
unction:
1. Temperature [Tdb]:
°C
2. Relative humidity [RH]:
%
3. Pressure (absolute) [P]:
bar
Calculate
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MegaWatSoft
HumidAir Tables
Excel Add-In
Win32 App
Group
Property name
Property ID
*
Results
Units (SI)
Units (E)
Constants used in calculation
Constants used in calculation
1. Temperatures
1
1. Temperatures
Dry bulb temperature
Tdb
°C
°F
Molar mass of dry air: M = 28.9645 g/mol
Molar mass of dry air: M = 28.9645 lbm/lbmol
2
1. Temperatures
Wet bulb temperature
Twb
°C
°F
Molar mass of water: M = 18.016 g/mol
Molar mass of water: M = 18.016 lbm/lbmol
3
1. Temperatures
Dew point temperature
Tdp
°C
°F
2. Pressures
4
2. Pressures
Pressure (absolute)
P
bar
psi
Reference state (zero enthalpy and entropy) is set at:
Reference state (zero enthalpy and entropy) is set at:
5
2. Pressures
Saturation water pressure
Ps
bar
psi
Temperature: t =
0 °C
Temperature: t =
32 °F
6
2. Pressures
Saturation pressure at wet bulb temperature
Pwb
bar
psi
Pressure: p =
1.01325 bar
Pressure: p =
14.695948804 psi
7
2. Pressures
Saturation pressure at dew point temperature
Pdp
bar
psi
3. Fractions
8
3. Fractions
Mole fraction of water
Xw
dimensionless
dimensionless
9
3. Fractions
Mole fraction of air
Xa
dimensionless
dimensionless
10
3. Fractions
Weight fraction of water
Ww
dimensionless
dimensionless
11
3. Fractions
Weight fraction of air
Wa
dimensionless
dimensionless
4. Humidity
12
4. Humidity
Humidity ratio
W
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
13
4. Humidity
Saturation humidity ratio
Ws
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
14
4. Humidity
Degree of saturation
DS
dimensionless
dimensionless
15
4. Humidity
Relative humidity
RH
dimensionless
dimensionless
5. Specific Volumes
16
5. Specific Volumes
Specific volume of dry air
Va
m³/(kg dry air)
ft³/(lb dry air)
17
5. Specific Volumes
Specific volume of saturated ice
Vi
m³/kg
ft³/lb
18
5. Specific Volumes
Specific volume of saturated water
Vw
m³/kg
ft³/lb
19
5. Specific Volumes
Specific volume of saturated vapor
Vv
m³/kg
ft³/lb
20
5. Specific Volumes
Specific volume of moist air
Vm
m³/(kg dry air)
ft³/(lb dry air)
6. Specific Densities
21
6. Specific Densities
Specific density of dry air
Da
(kg dry air)/m³
(lb dry air)/ft³
22
6. Specific Densities
Specific density of saturated ice
Di
kg/m³
lb/ft³
23
6. Specific Densities
Specific density of saturated water
Dw
kg/m³
lb/ft³
24
6. Specific Densities
Specific density of saturated vapor
Dv
kg/m³
lb/ft³
25
6. Specific Densities
Specific density of moist air
Dm
(kg dry air)/m³
(lb dry air)/ft³
7. Specific Enthalpies
26
7. Specific Enthalpies
Specific enthalpy of dry air
Ha
kJ/(kg dry air)
Btu/(lb dry air)
27
7. Specific Enthalpies
Specific enthalpy of saturated ice
Hi
kJ/kg
Btu/lb
28
7. Specific Enthalpies
Specific enthalpy of saturated water
Hw
kJ/kg
Btu/lb
29
7. Specific Enthalpies
Specific enthalpy of saturated vapor
Hv
kJ/kg
Btu/lb
30
7. Specific Enthalpies
Specific enthalpy of moist air
Hm
kJ/(kg dry air)
Btu/(lb dry air)
8. Specific Entropies
31
8. Specific Entropies
Specific entropy of dry air
Sa
kJ/(kg dry air·K)
Btu/(lb dry air·°F)
32
8. Specific Entropies
Specific entropy of saturated ice
Si
kJ/(kg·K)
Btu/(lb·°F)
33
8. Specific Entropies
Specific entropy of saturated water
Sw
kJ/(kg·K)
Btu/(lb·°F)
34
8. Specific Entropies
Specific entropy of saturated vapor
Sv
kJ/(kg·K)
Btu/(lb·°F)
35
8. Specific Entropies
Specific entropy of moist air
Sm
kJ/(kg dry air·K)
Btu/(lb dry air·°F)
Inlet Point
1. Temperature [Tdb]:
°C
2. Relative Humidity [RH]:
%
3. Pressure [P]:
bar
4. Air flow rate:
m³/hr
Outlet Point
1. Temperature [Tdb]:
°C
2. Relative Humidity [RH]:
%
3. Pressure [P]:
bar
Calculate
Clear Results
Group
Property name
Results (
Calculation 1
)
Results (
Calculation 2
)
Results (
Calculation 3
)
Units (SI)
Units (E)
*
Tips
1. Inlet Data
1
1. Inlet Data
Inlet temperature [ Tdb ]
°C
°F
2
1. Inlet Data
Inlet relative humidity [ RH ]
dimensionless
dimensionless
3
1. Inlet Data
Inlet pressure [ P ]
bar
psi
4
1. Inlet Data
Inlet air flow rate
m³/hr
ft³/min
2. Outlet Data
5
2. Outlet Data
Outlet temperature [ Tdb ]
°C
°F
6
2. Outlet Data
Outlet relative humidity [ RH ]
dimensionless
dimensionless
7
2. Outlet Data
Outlet pressure [ P ]
bar
psi
8
2. Outlet Data
Outlet air flor rate
m³/hr
ft³/min
3. Heating / Cooling
9
3. Heating / Cooling
Sensible heat flow (heating)
kW
Btu/h
Sensible heating component
10
3. Heating / Cooling
Latent heat flow (heating)
kW
Btu/h
Humidifying component
11
3. Heating / Cooling
Sensible heat flow (cooling)
kW
Btu/h
Sensible cooling component
12
3. Heating / Cooling
Latent heat flow (cooling)
kW
Btu/h
Dehumidifying component
13
3. Heating / Cooling
Total heat flow
kW
Btu/h
14
3. Heating / Cooling
Sensible heat factor
dimensionless
dimensionless
Inlet Point 1
1. Temperature [Tdb]:
°C
2. Relative Humidity [RH]:
%
3. Pressure [P]:
bar
4. Air flow rate:
m³/hr
Inlet Point 2
1. Temperature [Tdb]:
°C
2. Relative Humidity [RH]:
%
3. Pressure [P]:
bar
4. Air flow rate:
m³/hr
Calculate
Clear Results
Group
Property name
Results (
Calculation 1
)
Results (
Calculation 2
)
Results (
Calculation 3
)
Units (SI)
Units (E)
*
Tips
1. Inlet Point 1
1
1. Inlet Point 1
Inlet temperature [ Tdb ]
°C
°F
2
1. Inlet Point 1
Inlet relative humidity [ RH ]
dimensionless
dimensionless
3
1. Inlet Point 1
Inlet pressure [ P ]
bar
psi
4
1. Inlet Point 1
Inlet humidity ratio [ W ]
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
5
1. Inlet Point 1
Inlet enthalpy [ Hm ]
kJ/(kg dry air)
Btu/(lb dry air)
6
1. Inlet Point 1
Inlet density [ Dm ]
(kg dry air)/m³
(lb dry air)/ft³
7
1. Inlet Point 1
Inlet air flow rate
m³/hr
ft³/min
8
1. Inlet Point 1
Inlet mass flow rate
kg/s
lb/s
2. Inlet Point 2
9
2. Inlet Point 2
Inlet temperature [ Tdb ]
°C
°F
10
2. Inlet Point 2
Inlet relative humidity [ RH ]
dimensionless
dimensionless
11
2. Inlet Point 2
Inlet pressure [ P ]
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
12
2. Inlet Point 2
Inlet humidity ratio [ W ]
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
13
2. Inlet Point 2
Inlet enthalpy [ Hm ]
kJ/(kg dry air)
Btu/(lb dry air)
14
2. Inlet Point 2
Inlet density [ Dm ]
(kg dry air)/m³
(lb dry air)/ft³
15
2. Inlet Point 2
Inlet air flow rate
m³/hr
ft³/min
16
2. Inlet Point 2
Inlet mass flow rate
kg/s
lb/s
3. Mixing Point
17
3. Mixing Point
Temperature [Tdb]
°C
°F
18
3. Mixing Point
Relative Humidity [RH]
dimensionless
dimensionless
19
3. Mixing Point
Pressure (absolute) [P]
bar
psi
20
3. Mixing Point
Humidity ratio [W]
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
21
3. Mixing Point
Enthalpy [Hm]
kJ/(kg dry air)
Btu/(lb dry air)
22
3. Mixing Point
Density [ Dm ]
(kg dry air)/m³
(lb dry air)/ft³
23
3. Mixing Point
Air flow rate
m³/hr
ft³/min
24
3. Mixing Point
Mass flow rate
kg/s
lb/s
25
3. Mixing Point
Superheat (non fog) area
dimensionless
dimensionless
26
3. Mixing Point
Supersaturation (fog) area
dimensionless
dimensionless
27
3. Mixing Point
Moisture created as fog or droplets
(kg moisture)/(kg dry air)
(lb moisture)/(lb dry air)
S
etup Pane
Units
SI
U
nits
E
nglish Units
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utput Pane
*
Tdb
[°C]
Twb
[°C]
Tdp
[°C]
P
[bar]
Xw
[ - ]
Xa
[ - ]
Ww
[ - ]
Wa
[ - ]
W
[(kg moisture)/(kg dry air)]
RH
[ - ]
Va
[m³/(kg dry air)]
Vm
[m³/(kg dry air)]
Da
[(kg dry air)/m³]
Dm
[(kg dry air)/m³]
Ha
[kJ/(kg dry air)]
Hm
[kJ/(kg dry air)]
Sa
[kJ/(kg dry air·K)]
Sm
[kJ/(kg dry air·K)]
Process
Point
1
2
3
4
5
6
*
Tdb
[°F]
Twb
[°F]
Tdp
[°F]
P
[psi]
Xw
[ - ]
Xa
[ - ]
Ww
[ - ]
Wa
[ - ]
W
[(lb moisture)/(lb dry air)]
RH
[ - ]
Va
[ft³/(lb dry air)]
Vm
[ft³/(lb dry air)]
Da
[(lb dry air)/ft³]
Dm
[(lb dry air)/ft³]
Ha
[Btu/(lb dry air)]
Hm
[Btu/(lb dry air)]
Sa
[Btu/(lb dry air·°F)]
Sm
[Btu/(lb dry air·°F)]
Process
Point
1
2
3
4
5
6
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