Mitsubishi Electric GUG-01SL-E, Technical Manual

Page: 45 / 76

42
CHAPTER
9
Model selection and capacity calculation
SHF at the air condition of Outdoor air 33˚CDB, 63%RH (27˚CWB) and Return air 26˚CDB, 50%RH (18.7˚CWB).
39.8 kJ/kg(DA)
0.57
62.0 kJ/kg(DA)
15.4
˚C
28.0
˚C
1.006 kJ/kg·K
Calculate supply air temperature using SHF (sensible heat factor) given in the table below.
[RA temperature control]
Dx-coil unit
GUG-01SL-E GUG-02SL-E GUG-03SL-E
Connected
Lossnay
LGH-
50RVX-E
LGH-
65RVX-E
LGH-
80RVX-E
LGH-
100RVX-E
LGH-
150RVX-E
LGH-
200RVX-E
LGH-
150RVXT-E
LGH-
200RVXT-E
LGH-
250RVXT-E
Air volume
[m
3
/h]
500 650 800 1000
1500 2000 1500 2000 2500
Connected
Outdoor unit
ZRP35 ZRP35 ZRP50
ZRP71 ZRP100 ZRP100 ZRP100 ZRP100 ZRP125
CA (kW) 3.80 4.22
5.09 7.36 9.68 10.19 9.68 10.19 13.19
SHC (kW) 2.17
2.45 3.05 4.2 5.71 6.62 5.71 6.62 9.36
SHF
0.57 0.58 0.60 0.57 0.59 0.65 0.59 0.65 0.71
Dx-coil unit
- -
GUG-02SL-E GUG-03SL-E
Connectable
Lossnay
- -
LGH-
80RVX-E
LGH-
100RVX-E
LGH-
150RVX-E
LGH-
200RVX-E
LGH-
150RVXT-E
LGH-
200RVXT-E
LGH-
250RVXT-E
Air volume
[m 3 /h]
- -
800 1000 1500 2000 1500 2000 2500
Connected
Outdoor unit
- -
ZRP50 ZRP50 ZRP71 ZRP71 ZRP71 ZRP71 ZRP71
CA (kW)
- -
5.09
5.4 7.23 7.54 7.23 7.54 8.23
SHC (kW)
- -
3.05 3.35 5.21
5.66 5.21 5.66 6.25
SHF
- -
0.60 0.62 0.72 0.75
0.72 0.75 0.76
[SA temperature control]
SHF is calculated by following formula.
SHF = q
s
/ q
t
= c x ΔT / Δh = c [kJ/kg · K] x (T
i
- T
O
) [K] / (h
i
- h
O
) [kJ/kg(DA)]
From this, supply air temperature T
O
can be calculated by following formula.
Supply air condition from Dx-coil can be read out by the psychrometric chart.
T
O
= T
i
- SHF x (h
i
- h
O
) / c
q
s
: Sensible Heat
q
t
: Total Heat
SHF : Sensible heat factor (Read out from above table)
h
O
: Enthalpy of supply air
h
i
: Enthalpy of Dx-coil inlet air
c : Specific heat capacity of Air
T
i
: Dx-coil inlet air temperature
Using these parameters,
T
O
: Supply air temperature
= 28.0 - 0.57 x ( 62.0 – 39.8 ) / 1.006
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.
Supply air from Dx-coil unit
Dry-bulb temperature [°C] 15.4
Wet-bulb temperature [°C] 14.2
Absolute humidity [kg/kg(DA)] 0.0096
Relative humidity [%] 88
Enthalpy [kJ/kg(DA)] 39.8