Tower water make-up requirements: Untreated – 2% of flow rate; Treated – 1.5% of flow rate
Chillers: 2.4GPM/Ton @ 10° F ∆T Flow Rate
- 12,000 BTU/HR/Ton
- 20° F – 60° F Standard Supply Range
- Rating at 50° F Supply Temperature
- 85° F Water Cooled Condenser
- 95° F Air Cooled Condenser
Cooling Tower = 15,000 BTU/HR/Ton
- 3 GPM per Ton
- 85° F Leaving Water Temperature
- 95° F Entering Water Temperature
- 78° F Wet Bulb
Weighted Water Test
Chiller Ton = GPMx∆T (Delta Temp) / 24
Tower Ton = GPMx∆T (Delta Temp) / 30
Chiller Sizing
Injection Molding
30#/hr H.D. Polyethlene = 1ton
35#/hr L.D. Polyethlene = 1ton
35#/hr Polypropylene = 1ton
45#/hr PVC = 1 ton
50#/hr ABS = 1 ton
Blow Molding
40#/hr Polyolefins = 1 ton
40#/hr PET = 1 ton
Minimum Flow 04.8 gpm/ton
Extrusion
50#/hr H.D. Polyethlene = 1 ton
50#/hr L.D. Polyethlene = 1 ton
50#/hr Polypropylene = 1 ton
75#/hr Polystyrene = 1 ton
75#/hr PVC = 1 ton
Injection Molding
50#/hr Polystyrene = 1 ton
40#/hr Nylon = 1 ton
35#/hr Acrylic = 1 ton
40#/hr Polyurethane = 1 ton
50#/hr Acetal = 1 ton
40#/hr PPO = 1 ton
40#/hr PET = 1 ton
50#/hr Polycarb = 1 ton
Blown Film Air Ring Cooling
105 CFM (50 ° F @ 78° F WBT) = 1 ton
Chiller Capacity Loss/Gain
- Decrease nominal tonnage by approximately 2% per degree below a 50 ° F leaving water temperature.
- Increase nominal tonnage approximately 2% per degree above 50 ° F leaving water temperature up to 55 ° F
Other Equipment
- Air Compressor w/no after cooler = .1 ton/Hp
- Air Compressor w/after cooler = .2 Ton/Hp
- Vacuum Pump = .1 ton/Hp
- Hydraulic Cooling =. 1 ton/Hp
- Barrel Cooling = .1 ton/in screw Dia.
- Hot Runner Mold = 1 ton/10.5KW
- Water Pump in Circuit = .2 Ton/Hr
- Feed Throat 400Ton Machine or above 1 Ton; Below 400 Ton – 1/2 Ton
Extrusion Equipment
- Gear Box Cooling = 1 Ton/100Hp
- Feed Throat 3″ Screw or Less = 1 Ton
- Above 3″ Screw = 2 Tons
- Barrel or Screw Cooling = 1 Ton/Inch of Screw Diameter
Pipe Sizing Guide
(Based on 5 – 7 feet/second velocity)
1/8” = .75 GPM
¼” = 1.5 GPM
3/8” = 3 GPM
1/2″ = 6 GPM
3/4″ = 10 GPM
1″ = 15 GPM
1 1/4″ = 30 GPM
1 1/2″ = 40 GPM
2″ = 70 GPM
2 1/2″ = 100 GPM
3″ = 150 GPM
4″= 275 GPM
6″ = 600 GPM
8″ = 1,000 GPM
10″ = 3000 GPM
12″ = 5000 GPM