55
CHAPTER
9
Model selection and capacity calculation
Select Dx-coil unit and outdoor unit as shown below.
STEP2. Selection of Dx-coil unit system
STEP3-2. Calculation of Dx-coil unit heating capacity
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
11.4 kW
5.1 kW
6.3 kW
(1) Calculation conditions
(A) L Dx-coil System configuration
(B) Temperature control feature
(2) Characteristics read out from specifications
(A) Heating capacity under specification condition
- Lossnay recovery
- Heating capacity of Dx-coil unit
Ventilation load per unit area =
ρ
x n x V
f
x ( h
O
- h
R
)
201.6 kJ/m
2
= 56.0 W/m
2
For details of each calculation, see Example 1-2.
The floor is assumed same room with Example 1-1.
Therefore, required air volume is also same with Example 1-1.
One of the main purpose of SA temperature control is to make up for ventilation load.
As written in Example 1-2, ventilation load is calculated as following under this conditions.
Example 3-2: Heating office floor by SA temperature control
I: Calculation of required ventilation air volume and selection of Lossnay unit
II: Calculation of heating load to determine the required capacity
III: Calculation of Lossnay energy recovery effect
STEP1. Calculation of required heating capacity
Adequate Lossnay model
LGH-100RVX-E
Required fresh air volume
1000m
3
/h
Dry Bulb Temp. Relative Humidity Wet Bulb Temp.
Enthalpy
Enthalpy difference
Heating
Outdoor Air
0 °C
50%
–3 °C
4.7 kJ/kg(DA)
33.6 kJ/kg(DA)
Return Air
20 °C
50%
13.7 °C
38.3 kJ/kg(DA)
Required heating capacity to make up for above ventilation load (not total heating load)
= 56.0 [W/m
2
] × 200 [m
2
] =
11.2 [kW]
Energy recovered by Lossnay
8.1 kW
Lossnay energy recovery effect can also be calculated by the same way with Example1-2.
Example 1-2 condition
Outdoor air
Return air
Dx-coil inlet air
(Lossnay outlet air)
Dry-bulb temperature [˚C]
0
20
16
Wet-bulb temperature [˚C]
–3
13.8
10
Absolute humidity [kg/kg(DA)]
0.0019
0.0073
0.0052
Relative humidity [%]
50
50
46
Enthalpy [kJ/kg(DA)]
4.7
38.3
29.1
Содержание GUG-01SL-E
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