 Mcquay pipe sizer is used for Sizing the Pipe in HVAC Industry

## Solved Example

Chilled Water Pipe Designing or Sizing:

Requirement: (Parameters)

• Flow Rate in GPM ( lit/Sec or m3/sec)
• 1 US Gallon = 3.78 lit
• 1 TR = 2.4 gpm ( if ∆T = 100F , CHWR-CHWS= 100F)
• Flow Rate = (TR x 24) / ∆T gpm
• From load calculation HAP report
• Chilled water piping layout
• Velocity in FPS
• Friction (ft/100’ or pipe length)

Using Pipe Sizer Software

Previous Example

Steps to use Pipe Sizer

1. Select the material and schedule
2. Standard chilled water Temperature = 500F Water
3. Select any Diameter and check the velocity
4. In order to get the required velocity decrease or increase diameter

Pipe Sizing A-B (Roof Piping)

Q = 1440 GPM

Vmax = 10FPS

Software Result

Vactual = 9.24 FPS

Pipe Diameter =8’’

Head loss hf = 3.158 ft/100ft

Pipe Sizing B-C (Riser Piping)

Q = 840 GPM

Vmax = 10FPS

Software Result

Vactual = 9.33 FPS

Pipe Diameter =6’’

Head loss hf = 4.49 ft/100ft

Pipe Sizing C-D (Riser Piping)

Q = 360 GPM

Vmax = 10FPS

Software Result

Vactual = 9.07 FPS

Pipe Diameter =4’’

Head loss hf = 7.019 ft/100ft

Pipe Sizing B-B1 AHU-3 (Floor Piping)

Q = 600 GPM

Vmax = 7 FPS

Software Result

Vactual = 6.66 FPS

Pipe Diameter =6’’

Head loss hf = 2.368 ft/100ft

Pipe Sizing C-C1 AHU-2 (Floor Piping)

Q = 480 GPM

Vmax = 7 FPS

Software Result

Vactual = 5.33 FPS

Pipe Diameter =6’’

Head loss hf = 1.555 ft/100ft

Pipe Sizing D-E AHU-1 (Floor Piping)

Q = 360 GPM

Vmax = 7 FPS

Software Result

Vactual = 5.77 FPS

Pipe Diameter =5’’

Head loss hf = 2.261 ft/100ft

For Return Line is Also the same as the supply Line

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