# GPM Calculations for 102 TR AIR COOLED CHILLER (Also Download Word File)

Calculation for Chilled Water Piping (Closed Piping System) :-

Primary Pump :

 Sections Flow Velocity Pipe Size Diameter Friction Loss Suction Side TR x 2.4102x2.4=244.8Gallons/Min(15.4  Litres/Sec) 4 to 76 Feet/Sec(1.82metres/Sec) 4 Inch(101.6mm) 2.7 Inches of Water Gauge/100Ft(22.13 Pascals/Metre) Discharge Side TR x 2.4102x2.4=244.8Gallons/Min(15.4  Litres/Sec) 8-1210(3.04metres/Sec) 3 Inch(72.15mm) 10.1 Inches of Water Gauge/100Ft(82.8)Pascals/Metre)

Secondary Pump :

 Sections Flow Velocity Pipe Size Diameter Friction Loss Suction Side TR x 2.4102x2.4=244.8Gallons/Min(15.4  Litres/Sec) 4 to 76 Feet/Sec(1.82metres/Sec) 4 Inch(101.6mm) 2.7 Inches of Water Gauge/100Ft(22.13 Pascals/Metre) Discharge Side TR x 2.4102x2.4=244.8Gallons/Min(15.4  Litres/Sec) 8-1210(3.04metres/Sec) 3 Inch(72.15mm) 10.1 Inches of Water Gauge/100Ft(82.8)Pascals/Metre)

Note :- For 10 degree temp drop through the chiller is 2.4gallons per min per ton of cooling (as per rule of thumb is 2.4 for each 1 TR ) and 3.0 gallons per min per ton through your condenser if it is water cooled.

Calculation for Condenser Piping (Open Piping System)

Primary Pump :

 Sections Flow Velocity Pipe Size Diameter Friction Loss Suction Side TR x 3.0102x3.0=306 Gallons/Min(19.3Litres/Sec) 4 to 76 Feet/Sec(1.82metres/Sec) 5 Inch(127mm) 4.5 Inches of Water Gauge/100Ft( 36.89Pascals/Metre) Discharge Side TR x 3.0102x3.0=306 Gallons/Min(19.3Litres/Sec) 8-1210(3.04metres/Sec) 3.5 Inch(88.9 mm) 15(122.9Pascals/Metre)

Secondary Pump :

 Sections Flow Velocity Pipe Size Diameter Friction Loss Suction Side TR x 3.0102x3.0=306 Gallons/Min(19.3Litres/Sec) 4 to 76 Feet/Sec(1.82metres/Sec) 5 Inch(127mm) 4.5 Inches of Water Gauge/100Ft( 36.89Pascals/Metre) Discharge Side TR x 3.0102x3.0=306 Gallons/Min(19.3Litres/Sec) 8-1210(3.04metres/Sec) 3.5 Inch(88.9 mm) 15(122.9Pascals/Metre)