Elbows, Sweeps and Swoop s - homepage | ACEEE...2017/02/27 · Elbows, Sweeps and SwoopTMs Gary...
Transcript of Elbows, Sweeps and Swoop s - homepage | ACEEE...2017/02/27 · Elbows, Sweeps and SwoopTMs Gary...
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Topics• Pressure Drop in Pipe and Fittings
• NESEA Conference, Mar 7-9, Boston, MA
• ASHRAE, June 23-28, Long Beach, CA
– 90.1, 189.1 Considering volume in pipe from source to use
• CEC Research Grant
– How Low Can You Go? How Close Can You Get?
– Estimated start date: June 2017
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Pressure Drop in Pipe and Fittings
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Pressure Drop in Pipe and Fittings
• Many materials and types of fittings• Calculations vs. measured data• Are the data we use representative of present day
materials and fittings?
From the current ASHRAE Fundamentals Pipe Sizing chapter• Hegberg (1995) and Rahmeyer (1999a, 1999b) discuss the origins of some of
the data shown in Tables 4 and Table 5. • The Hydraulic Institute (1990) data appear to have come from Freeman
(1941), work that was actually performed in 1895. • The work of Giesecke (1926) and Giesecke and Badgett (1931, 1932a, 1932b
may not be representative of current materials.
4
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Copper Tube: Fittings and Equivalent Length
http://www.engineeringtoolbox.com/equivalent-length-copper-pipe-fittings-d_1670.html
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CDA Publication A4015-14/16: Copper Tube Handbook, Table 14-7, Page 78
Copper Tube: Fittings and Equivalent Length
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PEX Fittings and Equivalent Length
https://www.huduser.gov/portal/publications/pex_design_guide.pdf Page 79
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http://www.charlottepipe.com/Documents/PL_Tech_Man/Charlotte_Plastics_Tech_Manual.pdf Page 48
PVC and CPVC: Fittings and Equivalent Length
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Pipe from ¼ inch to ¾ inch Nominal
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Pipe from ¼ inch to ¾ inch Nominal
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Close-coupled Elbows
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Even Closer
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90 Degree Elbows
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90 Degree Bend Supports
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15
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90° Elbow Type 2 FPS 4 FPS 5 FPS 8 FPS
PEX Crimp Insert 8.6 10.1 9.8 11.9
PEX Poly SS Press 7.9 8.9 8.9 9.6
PEX Cold Expansion 6.6 7.3 8.0 9.1
CPVC (Std Elb) 1.7 0.8 0.9 1.3
Copper (Std Tight Elb) 0.0 0.4 0.3 0.6
Water Velocity in Tubing Feet per Second
Equivalent Feet of 1/2" Tubing
Pressure Drop Due to Elbows
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Pressure Drop Due to Elbows
90° Elbow Type 2 FPS 4 FPS 5 FPS 8 FPS
PEX Poly SS Press 7.9 8.9 9.6Tight Spacing 8.4 10.8 11.7
PEX Cold Expansion 6.6 8.0 9.1Tight Spacing 7.9 9.3 9.4
CPVC (Std Elb) 1.7 0.9 1.3Tight Spacing 0.7 1.3 1.5
Tight Spacing of Elbows
Equivalent Feet of 1/2" TubingWater Velocity in Tubing Feet per Second
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Pressure Drop Due to Elbows
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Nominal Diameter1”
3/4”
5/8”
1/2”
3/8”
1/4”
1/8”
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Elbows
Sweeps
SwoopTMs
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Ideal 90 Degree Bend?
• One is which there is no extra pressure drop other than that due to the length of the bend
SwoopTM
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3/4”
1/2”
3/8”
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3/4”
1/2”
3/8”
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3/4”
1/2”
3/8”