Mitsubishi Electric GUG-01SL-E Technical Manual page 45

Direct expansion coil unit for lossnay, lossnay return air and supply air temperature control
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Calculate supply air temperature using SHF (sensible heat factor) given in the table below.
SHF at the air condition of Outdoor air 33˚CDB, 63%RH (27˚CWB) and Return air 26˚CDB, 50%RH (18.7˚CWB).
[SA temperature control]
SHF is calculated by following formula.
SHF = q
/ q
= c x ΔT / Δh = c [kJ/kg · K] x (T
s
t
From this, supply air temperature T
T
= T
- SHF x (h
- h
O
i
i
q
: Sensible Heat
s
q
: Total Heat
t
SHF : Sensible heat factor (Read out from above table)
h
: Enthalpy of supply air
O
h
: Enthalpy of Dx-coil inlet air
i
c : Specific heat capacity of Air
T
: Dx-coil inlet air temperature
i
Using these parameters,
T
: Supply air temperature
O
= 28.0 - 0.57 x ( 62.0 – 39.8 ) / 1.006
Supply air condition from Dx-coil can be read out by the psychrometric chart.
SHF depends on the designing conditions such as indoor / outdoor air conditions.
Use the adequate SHF for the actual designing by the table on page 65.
9
CHAPTER
- T
i
can be calculated by following formula.
O
) / c
O
Dry-bulb temperature
Wet-bulb temperature
Absolute humidity
Relative humidity
Enthalpy
Model selection and capacity calculation
) [K] / (h
- h
) [kJ/kg(DA)]
O
i
O
0.57
39.8 kJ/kg(DA)
62.0 kJ/kg(DA)
1.006 kJ/kg·K
28.0
15.4
Supply air from Dx-coil unit
[kg/kg(DA)]
[kJ/kg(DA)]
˚C
˚C
[°C]
15.4
[°C]
14.2
0.0096
[%]
88
39.8
42

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