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CHILLER SIZING GUIDE
Typically on WEDM/CEDM the chiller size has
been pre-determined by the manufacturer. However, there are situations where
chillers need to be sized for specific applications such as the addition of a high
pressure pump or auxiliary filtration system. The following is a breakdown of the
formula used to calculate chiller sizes:
Determine the capacity of the liquid in
dielectric tank using this formula:
L x W x H (inches) ÷ 231 (cu. inches/gallon)
= Gallons
Determine the weight per gallon of liquid.
Water is 8.33 lbs. per gallon. EDM oils range from 5-9 lbs. per gallon.
Determine the specific gravity of the
liquid. Water is 1. EDM oils range from .8 to 1.2, including synthetics.
Determine the temperature rise per hour of
the liquid. To determine the temperature rise, start with the liquid at room
temperature. (Typically first thing in the morning), start the machining process,
measuring the temperature rise every 30 minutes for a 2 hour duration. Use the
higher temperature rise calculated for the 2 hours. The reason for measuring every
half hour is that the heat rise will not always be consistent. Take these numbers
calculating in steps 1 - 4 and plug into this formula: Capacity in Gallons X
Weight/Gallon in Pounds X Specific Gravity X Temperature
Change Per Hour
Example: We have a
conventional EDM machine with a dielectric tank that measures 48" x 36" x
24"; the specific gravity of the EDM oil is .85; the weight of the EDM oil is 6.5
lob. per gallon; the heat rise is calculated at 7 degrees per hour: 180 x 6.5 x .85
x 7 = 6961.50. The recommended chiller would be EDM-PC-8000.
Helpful Formulas:
| SPECIFIC HEAT OF OIL: 0.5 BTU/LB/ºF |
BTU = Kcal X 3.968 |
| SPECIFIC HEAT OF WATER BASED COOLANTS: 1
BTU/LB/ºF |
1 CUBIC FOOT = 7.5 GALLONS |
| WEIGHT OF OIL: 7.8 lbs./gal |
GALLONS = LITERS X 0.2642 |
| WEIGHT OF WATER BASED COOLANTS: 8.3
lbs./gal |
PSI = BARS X 14.50 |
| WATTS X 3.1413 = BTU |
FEET OF WATER X 0.434 = PSI |
EBBCO
CHILLER MODELS
MODEL |
DESCRIPTION |
CAPACITY
BTU/HR |
ELECTRICAL REQUIREMENTS |
VOLTAGE |
PHASE |
HP |
AMPS |
PC-3300IL |
INLINE CHILLER |
3300 |
115/230 |
1 |
1/3 |
9.2/4.2 |
PC-3300P |
CHILLER WITH PUMP |
3300 |
115/230 |
1 |
1/3 |
10.5/5.0 |
PC-6000IL |
INLINE CHILLER |
6000 |
115/230 |
1 |
1/2 |
10.5/5.8 |
PC-6000P |
CHILLER WITH PUMP |
6000 |
115/230 |
1 |
1/2 |
11.8/6.5 |
PC-8000IL |
INLINE CHILLER |
8000 |
115/230 |
1 |
3/4 |
14.0/7.7 |
PC-8000P |
CHILLER WITH PUMP |
8000 |
115/230 |
1 |
3/4 |
16.3/8.6 |
PC-12000IL |
INLINE CHILLER |
12000 |
230 |
1 |
1 |
12 |
PC-12000IL-3 |
INLINE CHILLER |
12000 |
230/460 |
3 |
1 |
9.1/3.5 |
PC-12000P |
CHILLER WITH PUMP |
12000 |
230 |
1 |
1 |
12.7 |
PC-18000IL |
INLINE CHILLER |
18000 |
230 |
1 |
1.5 |
12 |
PC-18000IL-3 |
INLINE CHILLER |
18000 |
230/460 |
3 |
1.5 |
9.1/3.5 |
PC-18000P |
CHILLER WITH PUMP |
18000 |
230 |
1 |
1.5 |
12.7 |
PC-18000P-3 |
CHILLER WITH PUMP |
18000 |
230/460 |
3 |
1.5 |
-- |
PC-24000IL-3 |
INLINE CHILLER |
24000 |
230/460 |
3 |
|
14.8/6.0 |
PC-24000P-3 |
CHILLER WITH PUMP |
24000 |
230/460 |
3 |
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PC-36000IL-3 |
INLINE CHILLER |
36000 |
230/460 |
3 |
|
18.4/7.4 |
PC-36000P-3 |
CHILLER WITH PUMP |
36000 |
230/460 |
3 |
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| OPTIONAL CHILLER COMPONENTS |
PC-ATC |
AMBIENT TRACKING CONTROL |
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PC-DTC |
DIGITAL TEMPERATURE CONTROL |
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Contact Ebbco for Pricing and Delivery
1-800-809-3901
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