Thermal Transfer Systems BOL Series - Manual (Page 4)

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Performance Curves
Selection Procedure
step 1 determine Heat load. Typical Rule of Thumb, -size cooler for 1/3
of the input horsepower. Heat load may be expressed as either
Horsepower or BTU/Hr
or KW/°C .
HP=BTU/HR ÷ 2545
BTU/HR=HP x 2545
step 2 determine entering temperature difference.
(Actual E.T.D.)
E.T.D. = Entering oil – Entering Ambient
temperature air temperature
The entering oil temperature is generally the maximum desired
system oil temperature.
Entering air temperature is the highest Ambient Air temperature
the application will see.
step 3 determine the Corrected Heat dissipation to use the Curves
englisH Version
Corrected (BTU/Hr) 100°F
Heat Rejection
=
Heat Load
x
Desired E.T.D.
(BTU/HR) to use with selection chart
BTU/HR = KW x 1894.61 x E.T.D.(°F)
°C
metriC Version
Corrected KW Heatload (kw)
—— ———————
Heat Rejection °C
=
Desired E.T.D. (°C)
step 4 select model From Curves Enter the Performance Curves at the
bottom with the GPM oil flow and proceed upward to the adjusted
Heat Rejection from Step 3. Any Model or Curve on or above this
point will meet these conditions.
step 5 Calculate oil pressure drop Find the oil pressure drop
correction factor and multiply it by the Oil Pressure Drop found on
performance curve.
Listed Performance Curves are based on:
• 50 SSU (11 cSt) oil
• 100° F (55.56° C) Entering Temperature Difference (E.T.D.)
If your application conditions are different, then continue with the
selection procedure.
10,000
20,000
40,000
60,000
80,000
100,000
200,000
300,000
400,000
600,000
800,000
1,000,000
0.05
0.1
0.2
0.3
0.4
0.5
1.1
1.6
2.1
3.2
4.2
5.3
H
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ej
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B
TU
/H
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1
00
F
ET
D
H
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t R
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KW
/°
C
BOL-30
BOL-400
BOL-725
BOL-950
BOL-1200
BOL-1600
BOL-2000
BOL-16
BOL-8
BOL-4
= 5 PSI
= 10 PSI
= 15 PSI
= 20 PSI (0.34 BAR)
(0.69 BAR)
(1.03 BAR)
(1.38 BAR)
Oil P
Oil Flow GPM (LPM)
1
(3.79)
2
(7.57)
20
(75.71)
40
(151.42)
60
(227.12)
100
(378.54)
4
(15.14)
6
(22.71)
10
(37.85)
200
(757.08)
400
(1514.16)
BOL Models with Standard P-BAR Core
performance data Curve
Note: Derate heat
rejection values 15%
if using 50Hz motors.