Model selection and capacity calculation
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
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
STEP2. Selection of Dx-coil unit system
Select Dx-coil unit and outdoor unit as shown below.
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
x ( h
Dry Bulb Temp. Relative Humidity Wet Bulb Temp.
= 53.0 [W/m
] × 200 [m
Adequate Lossnay model
] = 10.6 [kW]
Adequate Dx-coil unit model
Adequate outdoor unit model
LGH-100RVX-E + GUG-02SL-E + PUHZ-ZRP50
SA Temperature control
= 53.0 W/m
Dx-coil inlet air
(Lossnay outlet air)