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www.DaikinApplied.com 61 AG 31-011 • REFRIGERANT PIPING DESIGN
Table 34: R-22 Refrigerant Line Sizing Table (kW)
Suction Discharge Liquid
SST -20°C -5°C 5°C -40°C -20°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
0 .02
∆ p
(Pa/m)
378 189 94 .6 572 286 143 366 189 183 74 .90 74 .90 74 .90 749
OD (mm)
12 0.75 0.51 0.34 1.25 0.87 0.59 1.76 1.20 0.82 2.30 2.44 2.60 7.08 11.24
15 1.43 0.97 0.66 2.45 1.67 1.14 3.37 2.30 1.56 4.37 4.65 4.95 11.49 21.54
18 2.49 1.70 1.15 4.26 2.91 1.98 5.85 4.00 2.73 7.59 8.06 8.59 17.41 37.49
22 4.39 3.00 2.04 7.51 5.14 3.50 10.31 7.07 4.82 13.32 15.15 15.07 26.66 66.18
28 8.71 5.95 4.06 14.83 10.16 6.95 20.34 13.98 9.56 26.24 27.89 29.7 44.57 131.0
35 15.99 10.96 7.48 27.22 18.69 12.8 37.31 25.66 17.59 48.03 51.05 54.37 70.52 240.7
42 26.56 18.20 12.46 45.17 31.03 21.27 61.84 42.59 29.21 79.50 84.52 90.00 103.4 399.3
54 52.81 36.26 24.88 89.69 61.79 42.43 122.7 84.60 58.23 157.3 167.2 178.1 174.1 794.2
67 94.08 64.79 44.48 159.5 110.05 75.68 218.3 150.08 103.80 279.4 297.0 316.3 269.9 1415.0
79 145.9 100.51 69.04 247.2 170.64 117.39 337.9 233.56 161.10 431.3 458.5 488.2 376.5 2190.9
105 312.2 215.39 148.34 527.8 365.08 251.92 721.9 499.16 344.89 919.7 977.6 1041.0 672.0 4697.0
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 34 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 1.18 0.80
30 1.10 0.88
40 1.00 1.00
50 0.91 1.11
Notes for Table 34 :
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
×