53
CHAPTER
9
Model selection and capacity calculation
III: Calculation of Lossnay energy recovery effect
Energy recovered by Lossnay
7.5 kW
Lossnay energy recovery effect can also be calculated by the same way with Example1-1.
Select Dx-coil unit and outdoor unit as shown below.
Example 1-1 condition
Outdoor air
Return air
Dx-coil inlet air
(Lossnay outlet air)
Dry-bulb temperature [˚C]
33
26
28
Wet-bulb temperature [˚C]
27
18.7
21.4
Absolute humidity [kg/kg(DA)]
0.0201
0.0105
0.0133
Relative humidity [%]
63
50
56
Enthalpy [kJ/kg(DA)]
84.6
52.9
62.0
STEP2. Selection of Dx-coil unit system
STEP3-1. Calculation of Cooling capacity of Dx-coil unit
Adequate Dx-coil unit model
GUG-02SL-E
Lossnay model
LGH-100RVX-E
Adequate outdoor unit model
PUHZ-ZRP50
Temperature control feature
Supply air temperature control
I: Read out characteristics from the specification sheet
LGH-100RVX-E + GUG-02SL-E + PUHZ-ZRP50
SA Temperature control
9.5 kW
4.2 kW
5.3 kW
(1) Calculation conditions
(A) L 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
Ventilation load per unit area =
ρ
x n x V
f
x ( h
O
- h
R
)
190.8 kJ/m
2
= 53.0 W/m
2
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.
II: Calculation of cooling load to determine the required capacity
Dry Bulb Temp. Relative Humidity Wet Bulb Temp.
Enthalpy
Enthalpy Difference
Cooling
Outdoor Air
33 °C
63%
27 °C
84.6 kJ/kg(DA)
31.8 kJ/kg(DA)
Return Air
26 °C
50%
18.7 °C
52.8 kJ/kg(DA)
Required cooling capacity to make up for above ventilation load (not total cooling load)
= 53.0 [W/m
2
] × 200 [m
2
] =
10.6 [kW]
For details of each calculation, see Example 1-1.
The floor is assumed same room with Example 1-1.
Therefore, required air volume is also same with Example 1-1.
Example 3-1: Cooling for an office floor by SA temperature control
I: Calculation of required ventilation air volume and selection of Lossnay unit
STEP1. Calculation of required cooling capacity
Adequate Lossnay model
LGH-100RVX-E
Required fresh air volume
1000m
3
/h
Содержание GUG-01SL-E
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