Illustrations - Refrigeration Line Sizing - Frozen Foods • 37
ILLUSTRATIONS
FIGURE 20
Refrigeration Line Sizing - Frozen Foods
40°F 50°F 60°F 70°F 80°F 90°F 100°F 120°F
0.96 0.95 0.95 0.95 0.97 1.00 1.05 1.21
Liquid Correction Factor:
1.12
Liquid Correction Factors for Liquid Line Sizing Table - Use Maximum Liquid Temperature
For maximum liquid temperatures other than 90°F, multiply rated Btuh by liquid correction factor before using the Liquid Line Sizing Table
Maximum Liquid Temperature:
Suction Horizontal Line Sizing
Up to 50 equivalent feet Up to 100 equivalent feet Up to 150 equivalent feet Up to 200 equivalent feet
90°F Liquid, 2°F Pressure Drop
‡
90°F Liquid, 2°F Pressure Drop
‡
90°F Liquid, 2°F Pressure Drop
‡
90°F Liquid, 2°F Pressure Drop
‡
From To Horizontal From To
Horizontal From To Horizontal
From To Horizontal
0 1,730
3/8
++
0 1,180
3/8
++
0 940
3/8
++
0 800
3/8
++
1,740 4,100
1/2
++
1,190 2,810
1/2
++
950 2,240
1/2
++
810 1,910
1/2
++
4,110 7,700
5/8
2,820 5,280
5/8
2,250 4,220
5/8
1,920 3,600
5/8
7,710 12,800
7/8
5,290 8,780
7/8
4,230 7,030
7/8
3,610 6,000
7/8
12,810 20,300 7/8 8,790 14,000 7/8 7,040 11,200 7/8 6,010 9,530 7/8
20,310 41,000 1-1/8 14,010 28,200 1-1/8 11,210 22,700 1-1/8 9,540 19,400 1-1/8
41,010 71,400 1-3/8 28,210 49,200 1-3/8 22,710 39,500 1-3/8 19,410 33,800 1-3/8
71,410 113,000 1-5/8 49,210 77,800 1-5/8 39,510 62,500 1-5/8 33,810 53,500 1-5/8
62,510 130,000 2-1/8 53,510 112,000 2-1/8
‡
For 1°F pressure drop, multiply rated BTU by 1.44 before using the Suction Horizontal Line Sizing Table.
++
Larger suction horizontal line size may be used, if preferred.
†
3/4 horizontal suction line may be used to reduce cost.
40°F 50°F 60°F 70°F 80°F 90°F 100°F 120°F
0.72 0.76 0.81 0.86 0.92 1.00 1.09 1.37
Liquid Correction Factors for Suction Horizontal Line Sizing Table - Use Maximum Liquid Temperature
For maximum liquid temperatures other than 90°F, multiply rated Btuh by liquid correction factor before using the Suction Horizontal Line Sizing Table
Maximum Liquid Temperature:
Liquid Correction Factor:
1.21
Suction Vertical Riser Sizing
Maximum Allowable Riser Size For Adequate Oil Return*
70°F Minimum Liquid Temperature, using 0.35 PSI Per 100 Feet (per 2006 ASHRAE Handbook - Refrigeration).
1,360 2,550 1/2
2,560 4,270 5/8
4,280 6,790
6,800 13,900 7/8
13,910 24,300 1-1/8
24,310 38,400 1-3/8
38,410 80,000 1-5/8
80,010 142,000 2-1/8
* If horizontal line size is smaller than specified vertical riser size, the smaller size may be used for both.
†
3/4 suction riser may be used to reduce pressure drop.
It may be necessary to make adjustments to compensate for
special situations which cause the actual Btuh to differ from
the rated Btuh of the cases.
All liquid line and suction line sizes are inches, refrigeration O.D.
Subject to change without notice.
R-404 Line Sizing Tables for Zero Zone VZ/VLC Frozen Food Freezer (-7°F Evaporator Temperature)
Liquid Line Sizing - Electric Defrost*
Up to 100 equivalent feet
Up to 150 equivalent feet
Up to 200 equivalent feet
90°F Liquid, 2°F Pressure Drop
90°F Liquid, 2°F Pressure Drop
90°F Liquid, 2°F Pressure Drop
90°F Liquid, 2°F Pressure Drop
For hot gas defrost, use a liquid line one size larger than shown.
For 1°F pressure drop, multiply rated Btuh by 1.45 before using the Liquid Line Sizing Table.
Larger liquid line size may be used (such as 3/8), if preferred.
3/4 liquid line may be used to reduce cost.
Liquid Correction Factors for Suction Vertical Riser Sizing Table - Use
Multiply rated Btuh by liquid correction factor before using the Suction Vertical Riser Sizing Table
Liquid Correction Factor:
Refer back to page 12
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