Daikin JEHCCU0180CL3 [6/216] Amount of sub cooling k ta te 27 32 35 38 43

Daikin JEHCCU0180CL3 [6/216] Amount of sub cooling k ta te 27 32 35 38 43
3.14 Series 4 EVI Unit
3.14.1 Piping Size Selection
Sizing of liquid and suction lines for EVI model will be different from
standard scroll models. Piping sizes of this model need to follow the
recommended correction coefficient of cooling capacity. This is vital
as if the pipework selected is oversized, especially for the suction
pipe, the gas velocity will be decreased at low mass flow rate / low
evaporating temperature, causing oil return problems. Undersized
suction lines will also cause decreased capacity due to increased
pressure drop.
The correction factor of refrigerant R404A is shown as below table:
(Watts)
CF
CF
CF
CF
CF
27
32
35
38
43
Ta
Te
-40
0.64
0.61
0.59
0.57
0.54
-35
0.66
0.63
0.61
0.59
0.55
-30
0.68
0.65
0.63
0.61
0.57
-25
0.70
0.67
0.65
0.63
0.58
-20
0.72
0.69
0.67
0.65
0.60
O-CU06-AUG17-3
All specifications are subjected to change by the manufacturer without prior notice. The English text is the original instruction.
Other languages are the translations of the original instructions.
6
3.14.2 Insulation Selection
The liquid pipe connecting CCU service valve to the evaporator must
be well insulated with recommended wall thickness of minimum ¾’’.
3.14.2 Expansion Valve Selection
The lower liquid temperature of the EVI unit can increase evaporator
expansion valve capacities. Selection of the expansion valve needs
to be done based on the expected amount of sub-cooling shown in
below tables:
For instance,
At condition of Te -35°C, Ta +32°C
Refrigerant R404A
Published cooling capacity = 5.9kW.
Cooling capacity = Correction factor x Published cooling capacity
= 0.63 x 5.9 kW
= 3.707kW
Therefore, the pipe sizes should be selected against the corrected
capacity of 3.71kW.
The correction factor of refrigerant R407A is shown as below table:
(Watts)
CF
CF
CF
CF
CF
27
32
35
38
43
Ta
Te
-40
0.73
0.68
0.65
0.62
0.57
-35
0.73
0.69
0.66
0.63
0.58
-30
0.73
0.69
0.67
0.64
0.60
-25
0.73
0.70
0.67
0.65
0.61
-20
0.73
0.70
0.68
0.66
0.63
(Watts)
CF
CF
CF
CF
CF
27
32
35
38
43
Ta
Te
-40
0.72
0.68
0.65
0.62
0.57
-35
0.73
0.68
0.66
0.63
0.58
-30
0.73
0.69
0.66
0.64
0.60
-25
0.73
0.69
0.67
0.65
0.61
-20
0.72
0.69
0.67
0.65
0.62
(Watts)
CF
CF
CF
CF
CF
27
32
35
38
43
Ta
Te
-40
0.71
0.67
0.65
0.62
0.58
-35
0.72
0.68
0.65
0.63
0.59
-30
0.71
0.68
0.65
0.63
0.59
-25
0.72
0.68
0.66
0.64
0.60
-20
0.72
0.69
0.67
0.65
0.61
The correction factor of refrigerant R407F is shown as below table:
The correction factor of refrigerant R448A/R449A is shown as below
table:
(A.) R404A
Amount of Sub-cooling (K)
Ta\Te
27
32
35
38
43
-40
39.9
40.9
41.5
42.1
43.1
-35
36.9
37.9
38.5
39.1
40.1
-30
33.9
34.9
35.5
36.1
37.1
-25
30.9
31.9
32.5
33.1
34.1
-20
27.9
28.9
29.5
30.1
31.1
(B.) R407A
Amount of Sub-cooling (K)
Ta\Te
27
32
35
38
43
-40
33.1
38.0
41.0
43.9
48.9
-35
32.8
37.0
39.5
42.0
46.2
-30
32.4
35.9
38.0
40.1
43.5
-25
32.1
34.9
36.5
38.1
40.9
-20
31.8
33.8
35.0
36.2
38.2
(C.) R407F
Amount of Sub-cooling (K)
Ta\Te
27
32
35
38
43
-40
33.8
38.8
41.9
44.9
50.0
-35
33.5
37.8
40.4
42.9
47.2
-30
33.1
36.7
38.8
41.0
44.5
-25
32.8
35.7
37.3
38.9
41.8
-20
32.5
34.6
35.8
37.0
39.0
(D.) R448A/R449A
Amount of Sub-cooling (K)
Ta\Te
27
32
35
38
43
-40
33.1
37.9
40.9
43.8
48.8
-35
32.8
36.9
39.4
41.9
46.1
-30
32.4
35.8
37.9
40.0
43.4
-25
32.1
34.8
36.4
38.0
40.8
-20
31.8
33.8
34.9
36.1
38.1
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