Daikin R22, Refrigerant Piping Design Manual, Page: 42 / 78

AG 31-011 • REFRIGERANT PIPING DESIGN 42 www.DaikinApplied.com
Table 7: R-22 Refrigerant Line Sizing (Tons)
Suction Discharge Liquid
SST 0°F 20°F 40°F 0°F 20°F 40°F
∆ T 2°F 1°F 0 .5°F 2°F 1°F 0 .5°F 2°F 1°F 0 .5°F 1°F 1°F 1°F
vel =
100 fpm
1°F
∆ p (PSI) 1 .60 0 .813 0 .406 2 .22 1 .104 0 .552 2 .91 1 .455 0 .727 3 .05 3 .05 3 .05 3 .05
OD (in .)
1/2 — 0.18 0.12 0.40 0.27 0.19 0.6 0.40 0.27 0.8 0.8 0.8 2.3 3.6
5/8 0.51 0.34 0.23 0.76 0.52 0.35 1.1 0.75 0.51 1.5 1.6 1.6 3.7 6.7
7/8 1.3 0.91 0.62 2.0 1.37 0.93 2.9 1.97 1.35 4.0 4.1 4.2 7.8 18.2
1-1/8 2.7 1.86 1.27 4.0 2.77 1.90 5.8 3.99 2.74 8.0 8.3 8.5 13.2 37.0
1-3/8 4.7 3.25 2.22 7.0 4.84 3.32 10.1 6.96 4.78 14.0 14.4 14.8 20.2 64.7
1-5/8 7.5 5.16 3.53 11.1 7.67 5.26 16.0 11.00 7.57 22.1 22.7 23.4 28.5 102.5
2-1/8 15.6 10.71 7.35 23.1 15.92 10.96 33.1 22.81 15.73 45.7 47.1 48.5 49.6 213.0
2-5/8 27.5 18.97 13.04 40.8 28.19 19.40 58.3 40.38 27.84 80.4 82.9 85.4 76.5 376.9
3-1/8 44.0 30.31 20.85 65.0 44.93 31.00 92.9 64.30 44.44 128.2 132.2 136.2 109.2 601.5
3-5/8 65.4 45.09 31.03 96.6 66.81 46.11 137.8 95.68 66.09 190.3 196.2 202.1 147.8 895.7
4-1/8 92.2 63.71 43.85 136.3 94.25 65.12 194.3 134.81 93.22 267.8 276.1 284.4 192.1 1263.2
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 7 are based on 105°F condensing temperature. Multiply table capacities by the following factors for other
condensing temperatures.
Condensing
Temperature (°F)
Suction Line Discharge Line
80 1.11 0.79
90 1.07 0.88
100 1.03 0.95
110 0.97 1.04
120 0.90 1.10
130 0.86 1.18
140 0.80 1.26
Notes for Table 7 :
1. Table capacities are in tons of refrigeration.
2. ∆p = pressure drop due to line friction, psi per 100 ft of
equivalent line length
3. ∆t = corresponding change in saturation temperature,
°F per 100 ft
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
×