Enthalpy [Kj/Kg(Da)]; Lgh-100Rvx-E + Gug-02Sl-E + Puhz-Zrp71; Return Air; (Lossnay Outlet Air) - Mitsubishi Electric GUG-01SL-E Technical Manual

9
Model selection and capacity calculation
CHAPTER
Example 3-1 : Cooling for an office floor by SA temperature control
For details of each calculation, see Example 1-1.
STEP1. Calculation of required cooling capacity
I: Calculation of required ventilation air volume and selection of Lossnay unit
The floor is assumed same room with Example 1-1.
Therefore, required air volume is also same with Example 1-1.
Required fresh air volume
II : Calculation of cooling load to determine the required capacity
One of the main purposes of SA temperature control is to make up for ventilation load.
As written in Example 1-1, ventilation load is calculated as following under this conditions.
Ventilation load per unit area = ρ x n x V
Outdoor Air
Cooling

Return Air

Required cooling capacity to make up for above ventilation load (not total cooling load)
III : Calculation of Lossnay energy recovery effect
Lossnay energy recovery effect can also be calculated by the same way with Example1-1.
Energy recovered by Lossnay
Example 1-1 condition
Dry-bulb temperature
Wet-bulb temperature
Absolute humidity [kg/kg(DA)]
Relative humidity
Enthalpy [kJ/kg(DA)]
STEP2. Selection of Dx-coil unit system
Select Dx-coil unit and outdoor unit as shown below.
LGH-100RVX-E
Temperature control feature
Supply air temperature control
STEP3-1. Calculation of Cooling capacity of Dx-coil unit
I : Read out characteristics from the specification sheet
(1) Calculation conditions
(A) Lossnay + Dx-coil System configuration
(B) Temperature control feature
(2) Characteristics read out from specifications
(D) Cooling capacity under specification condition
- Lossnay recovery
- Cooling capacity of Dx-coil unit
53
3
1000m /h
x ( h
f
Dry Bulb Temp. Relative Humidity Wet Bulb Temp.
33 °C
26 °C
2
= 53.0 [W/m ] × 200 [m
Outdoor air
[˚C] 33
[˚C] 27
0.0201
[%] 63
84.6
Lossnay model
Adequate Lossnay model
- h )
190.8 kJ/m
O R
63% 27 °C
50% 18.7 °C
2
] = 10.6 [kW]
7.5 kW
Return air
26
18.7
0.0105
50
52.9
Adequate Dx-coil unit model
Adequate outdoor unit model
LGH-100RVX-E + GUG-02SL-E + PUHZ-ZRP50
SA Temperature control
9.5 kW
4.2 kW
5.3 kW
LGH-100RVX-E
= 53.0 W/m
2 2
Enthalpy Enthalpy Difference
84.6 kJ/kg(DA)
31.8 kJ/kg(DA)
52.8 kJ/kg(DA)

Dx-coil inlet air

(Lossnay outlet air)

21.4
0.0133
62.0
GUG-02SL-E
PUHZ-ZRP50
28
56