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AG 31-011 • REFRIGERANT PIPING DESIGN
Table 42: Minimum Capacity For Discharge Riser (kW)
Saturated
Discharge
Temp
Discharge
Gas Temp
Pipe O .D . (mm)
(°C)
(°C)
12
15
18
22
28
35
42
54
67
79
105
130
20
60
0.563
0.032
0.735
2.956
5.619
9.969
16.094
30.859
43.377
80.897
116.904
288.938
70
0.5494
1.006
1.691
2.881
5.477
9.717
15.687
30.078
52.027
48.851
162.682
281.630
80
0.535
.0982
1.650
2.811
5.343
9.480
15.305
29.346
50.761
76.933
158.726
173.780
30
70
0.596
1.092
1.836
3.127
5.945
10.547
17.028
32.649
56.474
85.591
176.588
305.702
80
0.579
1.062
1.785
3.040
5.779
10.254
16.554
31.740
54.901
83.208
171.671
2970190
90
0.565
0.035
1.740
2.964
5.635
9.998
16.140
30.948
53.531
81.131
167.386
289.773
40
80
0.618
1.132
1.903
3.242
6.163
10.934
17.563
33.847
58.546
88.732
183.069
316.922
90
0.601
1.103
1.853
3.157
6.001
10.647
17.189
32.959
47.009
86.403
178.263
308.603
100
0.584
1.071
1.800
3.067
5.830
10.343
16.698
32.018
55.382
83.936
173.173
299.791
50
90
0.630
1.156
1.943
3.310
6.291
11.162
18.020
34.552
59.766
90.580
186.882
323.523
100
0.611
1.121
1.884
3.209
6.100
10.823
17.473
33.503
57.951
87.831
181.209
313.702
110
0.595
1.092
1.834
3.125
5.941
10.540
17.016
32.627
46.435
85.532
176.467
305.493
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,
Refrigeration capacity in kilowatts is based on saturated evaporator at -5°C, and condensing temperature as shown in table. For
other liquid line temperatures, use correction factors in the following table.
Saturated Suction Temperature (°C)
-50
-40
-30
-20
0
5
10
0.87
0.90
0.93
0.96
—
1.02
—
Table 43: R-134a Minimum Capacity For Discharge Riser (kW)
Saturated
Discharge
Temp
Discharge
Gas Temp
Pipe O .D . (mm)
(°C)
(°C)
12
15
18
22
28
35
42
54
67
79
105
130
20
60
0.469
0.860
1.445
2.462
4.681
8.305
13.408
25.709
44.469
67.396
139.050
240.718
70
0.441
0.808
1.358
2.314
4.399
7.805
12.600
24.159
41.788
63.334
130.668
226.207
80
0.431
0.790
1.327
2.261
4.298
7.626
12.311
23.605
40.830
61.881
127.671
221.020
30
70
0.493
0.904
1.519
2.587
4.918
8.726
14.087
27.011
46.722
70.812
145.096
252.916
80
0.463
0.849
1.426
2.430
4.260
8.196
13.232
25.371
43.885
66.512
137.225
237.560
90
0.452
0.829
1.393
2.374
4.513
8.007
19.926
24.785
42.870
64.974
134.052
232.066
40
80
0.507
0.930
1.563
2.662
5.061
8.979
14.496
27.794
48.075
72.863
150.328
260.242
90
0.477
0.874
1.469
2.502
4.756
8.439
13.624
26.122
45.184
68.480
141.285
244.588
100
0.465
0.852
1.432
2.439
4.637
8.227
13.281
25.466
44.048
66.759
137.735
238.443
50
90
0.510
0.936
1.573
2.679
5.093
9.037
14.589
27.973
48.385
73.332
151.296
261.918
100
0.479
0.878
1.476
2.514
4.779
8.480
13.690
26.248
45.402
68.811
141.696 2485.772
110
0.467
0.857
1.441
2.454
4.665
8.278
13.364
25.624
44.322
67.173
138.590
239.921
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,
Refrigeration capacity in kilowatts is based on saturated evaporator at -5°C, and condensing temperature as shown in table. For
other liquid line temperatures, use correction factors in the following table.
Saturated Suction Temperature (°C)
-50
-40
-30
-20
0
5
10
—
—
—
—
1.02
1.04
1.06