54
CHAPTER
9
Model selection and capacity calculation
II: Calculate the capacity of Dx-coil unit
1.0
1.0
5.3 kW
5.5 kW
1.04
(1) Air volume factor
(A) Air volume factor C
1
(2) Air condition difference factor
(A) Total air condition difference factor C
2
For the quick reference of air condition difference factor C
2
, see the page 63.
(3) Corrected refrigerant pipe length factor
(A) Corrected refrigerant pipe length factor C
3
(4) Adjusted Dx-coil unit capacity
(A) Dx-coil unit cooling capacity on the specification
(B) Adjusted Dx-coil unit cooling capacity
= (A) x C
1
x C
2
x C
3
= 5.3 x 1.0 x 1.04 x 1.0
STEP4. Comparison of L Dx-coil unit capacity with required capacity
By calculations from STEP 1 to 3, the capacity of L Dx-coil unit is summate as shown below.
Capacity calculation result
(A) Required cooling capacity for ventilation load
(B) Lossnay energy recovery
(C) Dx-coil cooling capacity
(D) L DX-coil unit system cooling capacity
= (B) + (C)
As a result, (D) is bigger than (A).
Therefore, under this example condition, L Dx-coil unit system has enough capacity for making up for ventilation load.
This result is based on when Dx-coil unit works at maximum capability point.
In the actual operation, Dx-coil unit changes its capability to follow the setting temperature.
For the “model selection of Dx-coil unit by supply air temperature”, see STEP3-3 on the page 57.
7.5 kW
5.5 kW
10.6 kW
13.0 kW
Summary of Contents for GUG-01SL-E
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