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AG 31-011 • REFRIGERANT PIPING DESIGN 62 www.DaikinApplied.com
Table 35: R-134a Refrigerant Line Size Table (kW)
Suction Discharge Liquid
SST 0°C 5°C 10°C -10°C 0°C 10°C
∆ T
(K/m)
0 .04 0 .02 0 .01 0 .04 0 .02 0 .01 0 .04 0 .02 0 .01 0 .02 0 .02 0 .02
vel = 0 .5
m/s
0 .02
∆ p
(Pa/m)
425 212 106 487 243 121 555 278 136 538 538 538 538
OD (mm)
12 0.92 0.63 0.43 1.11 0.76 0.51 1.33 0.91 0.62 1.69 1.77 1.84 6.51 8.50
15 1.76 1.20 0.82 2.12 1.45 0.99 2.54 1.74 1.19 3.23 3.37 3.51 10.6 16.30
18 3.60 2.09 1.43 3.69 2.53 1.72 4.42 3.03 2.07 5.61 5.85 6.09 16.0 28.40
22 5.40 3.69 2.52 6.50 4.46 3.04 7.77 5.34 3.66 9.87 10.3 10.7 24.5 50.1
28 10.7 7.31 5.01 12.8 8.81 6.02 15.3 10.6 7.24 19.5 20.3 21.1 41.0 99.5
35 19.5 13.4 9.21 23.5 16.2 11.1 28.1 19.4 13.3 35.6 37.2 38.7 64.9 183.0
42 32.4 22.3 15.3 39.0 26.9 18.4 46.5 32.1 22.1 59.0 61.6 64.1 95.2 304.0
54 64.4 44.4 30.5 77.3 53.4 36.7 92.2 63.8 44.0 117.0 122.0 127.0 160.0 605.0
67 115.0 79.0 54.4 138.0 95.0 65.4 164.0 113.0 78.3 208.0 217.0 226.0 248.0 1080.0
79 177.0 122.0 84.3 213.0 147.0 101.0 253.0 176.0 122.0 321.0 335.0 349.0 346.0 1670.0
105 379.0 262.0 181.0 454.0 315.0 217.0 541.0 375.0 260.0 686.0 715.0 744.0 618.0 3580.0
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 35 are based on 40°C condensing temperature. Multiply table capacities by the following factors for other
condensing temperatures.
Condensing
Temperature (°C)
Suction Line Discharge Line
20 1.239 0.682
30 1.120 0.856
40 1.0 1.0
50 0.888 1.110
Notes for Table 35 :
1. Table Capacities are in kilowatts of refrigeration.
2. ∆p = pressure drop per unit equivalent length of line, Pa/m
3. ∆t = corresponding change in saturation temperature, K/m
4. Line capacity for other saturation temperatures ∆ t and
equivalent lengths L
e
5. Saturation temperatures ∆ T for other capacities and
equivalent lengths L
e
Line Capacity = Table Capacity
Table L
e
Actual L
e
Actual ∆ t
Table ∆ t
0.55
R-22 Sizing — Notes
×
∆t = Table ∆t
Actual L
e
Table L
e
Actual Capacity
Table Capacity
1.8
×
Line Capacity = Table Capacity
Table L
e
Actual L
e
Actual ∆ t
Table ∆ t
0.55
R-22 Sizing — Notes
×
∆t = Table ∆t
Actual L
e
Table L
e
Actual Capacity
Table Capacity
1.8
×