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www.DaikinApplied.com 63 AG 31-011 • REFRIGERANT PIPING DESIGN
Table 36: R-410A Refrigerant Line Size Table – SI
Suction Discharge Liquid
SST -20°C -5°C 5°C -20°C -5°C 5°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
2
∆ p
(Pa/m)
599 .1 299 .6 149 .8 894 .2 447 .1 223 .6 1137 .6 568 .8 284 .4 1172 .1 1172 .1 1172 .1 1179
OD (mm)
12 1.20 0.82 0.56 2.05 1.40 0.96 2.83 1.94 1.32 3.84 4.00 4.07 6.2 14.3
15 2.29 1.57 1.07 3.90 2.68 1.83 5.37 3.69 2.53 7.31 7.60 7.75 10.1 27.2
18 3.98 2.73 1.86 6.76 4.65 3.19 9.30 6.41 4.39 12.67 13.16 13.42 15.4 47.3
22 7.00 4.81 3.28 11.89 8.19 5.61 16.32 11.26 7.74 22.20 23.08 23.53 23.5 83.0
28 13.82 9.51 6.51 23.43 16.15 11.09 32.11 22.19 15.28 43.70 45.42 46.31 39.3 163.7
35 25.33 17.44 11.95 42.82 29.56 20.38 58.75 40.66 27.99 79.84 82.98 84.62 62.2 299.6
42 42.00 28.92 19.88 70.89 49.03 33.75 97.02 67.28 46.41 131.87 137.06 139.76 91.3 495.7
54 83.26 57.48 39.55 140.29 97.22 67.10 191.84 133.10 92.11 260.80 271.06 276.39 153.7 982.0
67 147.94 102.34 70.53 249.16 172.78 119.50 340.33 236.73 163.91 462.73 480.93 490.40 238.2 1746.4
79 229.02 158.27 109.33 384.65 267.04 184.82 525.59 365.38 253.23 713.37 741.44 756.03 332.2 2695.2
105 488.64 338.41 234.20 820.20 569.83 395.31 1119.32 778.82 541.15 1519.45 1579.22 1610.30 592.9 5744.4
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 36 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 1.238 0.657
30 1.122 0.866
40 1.000 1.000
50 0.867 1.117
Notes for Table 36 :
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
×