17
ENG
Heos BOX R704
+0300140EN - rel. 1.0 - 25.05.2022
Minimum cooling capacity in kW to ensure the oil is carried through an
evaporator with 2 circuits
T_evap
SH
T_cond
Piping nominal outside diameter (OD), mm
°C
K
°C
6
8
10
12
14
16
18
22
-5
10
5
0.633
1.615
2.820
4.927
7.772
11.023
14.976
24.518
10
0.598
1.527
2.667
4.659
7.349
10.422
14.161
23.182
15
0.562
1.433
2.504
4.374
6.900
9.786
13.296
21.766
20
0.522
1.333
2.328
4.067
6.415
9.099
12.362
20.238
25
0.479
1.221
2.134
3.727
5.879
8.338
11.329
18.546
Tab. 2.t
Example OD for an evaporator with a LT circuit:
• Number of loads = 1
• Nominal cooling capacity Qn = 1 kW
• T_evap = -30°C
• T_cond = 5°C
OD = 10 mm
Qn > min Q to guarantee the oil is
carried
(1 kW > 0.735 kW)
OK
OD = 12 mm
Qn < min Q to guarantee the oil is
carried
(1 kW < 1.285 kW)
NOT OK
The diameter of the evaporator piping should be 10 mm or lower
2.12.4 Suction pipe sizing requirements
When sizing the suction piping, it is important to select the correct
diameter, taking into consideration the minimum cooling capacity needed
to carry the oil.
The tables below show the minimum cooling capacity as a function of:
• Operating conditions;
• Pipe diameter.
For the optimum diameter, make sure that the required design cooling
capacity is higher than the value shown in the table that guarantees oil
return.
LT application (low temperature)
Minimum cooling capacity in kW to ensure the oil is carried in the
suction piping
T_evap
SH
T_cond
Piping nominal outside diameter (OD), mm
°C
K
°C
6
8
10
12
14
16
18
22
-30
10
5
0.275
0.702
1.226
2.141
3.378
4.790
6.508
10.655
10
0.260
0.664
1.159
2.025
3.195
4.531
6.155
10.077
15
0.244
0.623
1.089
1.902
3.000
4.255
5.781
9.465
20
0.227
0.580
1.013
1.769
2.791
3.958
5.378
8.804
25
0.208
0.532
0.929
1.622
2.559
3.629
4.931
8.072
Tab. 2.u
Minimum cooling capacity in kW to ensure the oil is carried in the
suction piping
T_evap
SH
T_cond
Piping nominal outside diameter (OD), mm
°C
K
°C
6
8
10
12
14
16
18
22
-25
10
5
0.298
0.761
1.329
2.322
3.663
5.195
7.059
11.556
10
0.282
0.720
1.257
2.197
3.465
4.914
6.677
10.931
15
0.265
0.676
1.181
2.063
3.255
4.616
6.272
10.268
20
0.247
0.629
1.099
1.920
3.028
4.295
5.835
9.553
25
0.226
0.577
1.008
1.761
2.777
3.939
5.352
8.762
Tab. 2.v
Содержание HB200C0300CE0
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