To size your production machine cooling load use the following information: Calculate the total lbs/hour of material your machine uses and divide it by the lbs/ton listed below for your specific process. This will give you the tons of cooling required at 50° Fleaving water temperature.
When operating below 50° F you must decrease the rated chiller cooling capacity by 2% for every one degree F you operate below 50° F.
To correct for 45° F operation you would divide the chiller rated cooling load by 0.9. See calculation: 100% – (2% x 5° F below 50° F) = 90% or 0.9.
| INJECTION MOLDING = 1 LBS/TON | EXTRUSION = 1 LBS/TON |
| 30 lbs/hour HDPE 35 lbs/hour LDPE 35 lbs/hour Acrylic 35 lbs/hour PP 40 lbs/hour Nylon 40 lbs/hour Derlin 40 lbs/hour Urethane 45 lbs/hour PET 50 lbs/hour PS 50 lbs/hour ABS 50 lbs/hour PC 50 lbs/hour Acetal 70 lbs/hour PVC |
SHEET CALENDERING 35 lbs/hour PE 60 lbs/hour ABS 60 lbs/hour PS PROFILE |
| FEED THROAT: 1/2 ton up to 400 ton injection. 1 ton over 400 ton injection. |
Barrel = 1 ton/” screw dia Screw = 2 tons Throat = 1/2 ton up to 3″ Throat = 1 ton 4″ to 6″ Gear drive = 100 hp/ton (oil cooling) |
| BLOW HOLDING = 1 TON | VACUUM FORMING = 1 TON |
| 40 lbs/hour HDPE 40 lbs/hour PET 40 lbs/hour PVC |
70 lbs/hour HDPE & LDPE 70 lbs/hour PP 200 lbs/hour PS 250 lbs/hour PVC |
| HOT RUNNER MOLDS convert heater watts to btu’s and divide by 2. (watts x 3.414 divide by 24,000 Btu’s)MOTOR COOLING LOAD FOR PORTABLE CHILLERS | |
| Hydraulic cooling: | 8 hp = 1 ton |
| Vacuum pumps: | 8 hp = 1 ton |
| Air compressors: | 8 hp = 1 ton (internal oil cooling). |
| 8 hp = 1 ton (after cooler cooling). | |
| Chilled water flow rate is 2.4 gpm/ton. | |
| Chiller ton is 12,000 Btu’s | |
| Chiller operating temperature range with water is from 45° F. to 60° F. leaving water temperature. | |
| Chiller operating temperature range with glycol/water is from 25 F. to 45° F. leaving water temperature. | |