AIRAH Handbook - Millenium Edition Amendment 01

REFRIGERANT PIPE CAPACITY - R22
Fig 1 R22 Suction line capacity for 1K equivalent pressure drop
Amendment – Replaces pages 1016 – 1017 AIRAH HANDBOOK – Millenium Edition

Copper Pipe
Size Nominal
mm
12
15
18
22
28
35
42
54
67
79
105
100m Discharge Line: Δ T=2 K,
( Δ P=75kPa)
Saturated Suction Temperature, °C
100m Liquid Line
-40 -20 +5 Velocity = 0.5 m/s Δ T = 2 K
2.3
4.37
7.59
13.32
26.24
48.03
79.5
157.33
279.41
431.31
919.67
2.44
4.65
8.06
14.15
27.89
51.05
84.52
167.24
297.02
458.50
977.64
2.60
4.95
8.59
15.07
29.70
54.37
90.00
178.09
316.29
488.24
1041.05
7.08
11.49
17.41
26.66
44.57
70.52
103.45
174.13
269.94
376.47
671.98
Amendment – Replaces pages 1016 – 1017 AIRAH HANDBOOK – Millenium Edition
( Δ P=75 kPa)
11.24
21.54
37.49
66.18
131.01
240.67
399.34
794.19
1414.99
2190.88
4696.95
The above tables gives kW of refrigeration resulting in a line friction drop (Δ P in kPa) per 100m equivalent
pipe length as shown, with corresponding change (Δ T) in saturation temperature.
REFRIGERANT PIPE CAPACITY - R 22 (cont.)
FITTING EQUIVALENT LENGTHS (METERS OF STRAIGHT PIPE)
Pipe OD mm 12.7 15.9 19.1 22.2* 28.6* 34.9* 41.3* 54.0*
Pipe OD inches 1/2 5/8 3/4 3/4 1-1/8* 1-3/8* 1-5/8* 2-1/8*
Smooth bend type
90° Standard 0.40 0.50 0.60 0.70 0.90 1.10 1.28 1.58
90° Long Radius 0.30 0.30 0.40 0.45 0.60 0.75 0.85 1.05
45° Standard 0.20 0.20 0.30 0.35 0.45 0.55 0.65 0.85
45° Long Radius* 0.15 0.15 0.20 0.22 0.30 0.37 0.43 0.57
*Data for these sizes fitting interpolated
Table 1: Fitting Equivalent Lengths (meters of a straight pipe)

Fig 2: R22 suction risers minimum capacity for oil return
Notes for discharge and liquid lines
Note 1. For other Δ Ts and Equivalent Lengths, Le:
⎡ Table Le Actual ΔT
Loss Desired ⎤
Line Capacity = Table Capacity × ⎢ ×
Actual Le Table T Loss
⎥
⎣
Δ ⎦
Note 2. For other Capacity and Equivalent Lengths in a given pipe size:
Actual Le ⎡Actual
Capacity⎤
Δ T = TableΔT
× ×
Table Le
⎢
TableCapacity
⎥
⎣
⎦
Note 3. Values based on 40°C condensing temperature.
Amendment – Replaces pages 1016 – 1017 AIRAH HANDBOOK – Millenium Edition
1.
8
0.
55

For capacities at other condensing temperatures, multiply table capacity by the following factors:
Condensing Temperature, °C
20 30 40 50
Suction Lines 1.18 1.10 1.00 0.91
Hot Gas Lines 0.80 0.88 1.00 1.11
Source: ASHRAE
Wills, I; Simplified R22 Suction Line sizing, AIRAH journal, pg 30-31 (June 2001)
Amendment – Replaces pages 1016 – 1017 AIRAH HANDBOOK – Millenium Edition