• Cooling Tower = 3 GPM per ton
• 1 Tower Ton = 15,000 BTU/hr
• Tower Ton = GPM x ΔT/30

• Chiller Tower = 2.4 GPM / ton
• 1 ChillerTon = 12,000 BTU / hr
• Chiller Ton = GPM x ΔT / 24

MATERIAL
• 30# / hr H.D. Polyethylene = 1 ton
• 35# / hr L.D. Polyethylene = 1 ton
• 35# / hr Polypropylene = 1 ton
• 45# / hr PVC = 1 ton
• 50# / hr ABS = 1 ton
• 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

MACHINE
• Hydraulics = .1 ton / HP
• Feed Throat = 1/2 ton each

MATERIAL
• 50# / hr H.D. Polyethylene = 1 ton
• 50# / hr L.D. Polyethylene = 1 ton
• 50# / hr Polypropylene = 1 ton
• 75# / hr Polystyrene = 1 ton
• 70# / hr PVC = 1 ton

MACHINE
• Extruder Barrel = .1 ton / inch
• Gear Box = 1 ton / 100 HP
• Feed Throat : diameter is < 3" = 1 ton
• Feed Throat : diameter is > 3" = 1 ton
• Air Ring Cooling @ 105 CFM = 1 ton
    (50°F air @ 78°F WBT)

MATERIAL
• 40# / hr Polyolefins = 1 ton
Minimun Flow is 4.8 GPM / ton

MACHINE
• Hydraulics = .1 ton / inch
• Feed Throat = 1/2 ton

• Air Compressors with no after cooler = .1 ton / HP
• Air Compressor with after cooler = .2 ton / HP
• Vacuum Pump = .1 ton / HP
• Machine Tools = .1 ton / HP
• Water-Cooled Chillers = 1 ton tower for 1 ton chiller
• Mold Temperature Controllers = 1.2 ton per zone (heating)
• Mold Temperature Controllers = use PPH chart (cooling)
• Barrel Cooling = Heat removal (BTU / hr) = 1 ton / inch screw diameter
• Spot Welders = 1/4 ton per tip (for chilled water)
• Plating Baths = Heat removal (BTU / hr) = DC amps x DC volts x 2.56
• Mold Room Heating = 25 BTU / sq.ft. with 16' ceiling
• Non Mold Room Heating = 50 BTU / sq.ft. with 16' ceiling
• Mold Room Air Conditioning = 80 sq.ft / ton with 16' ceiling

• Zinc = Heat removal (BTU / hr) = M x 35 BTU / lb
             M = throughput rate (lbs / hr)
             Pour at 800°F
             Remove at 300°F
• Aluminum = Heat removal (BTU / hr) = M x 35 BTU / lb
                     M = throughput rate (lbs / hr)
                     Pour at 1200°F
                     Remove at 900°F

• For each 1°F below 50°F LWT = 2% of rated chiller capacity