Hydraulic Oil Cooler
hydraulic-oil-cooler
Standard Oil Cooler 1-2 Pass Models :
Model
Size
Capacity kcal/hr
Oil Flow LPM
A
B
C
D
E
N1/N2
N3/N4
NS DRAIN
FOC 2 4 "x 18 " 1500 10-15 456 78 300 370 100 G 3/4 " G 1 " G 1/4 "
FOC 3 4 " x 20 " 2400 15-30 472 81 310 386 100 G 3/4 " G 1 " G 1/4 "
FOC 5 4 " x 24 " 3000 20-35 606 88 430 520 100 G 1 " G 1 " G 1/4 "
FOC 7.5 4 " x 30 " 5000 30-35 756 93 570 670 100 G 1 " G 1 " G 1/4 "
FOC 10 6 " x 18 " 6000 35-75 456 78 300 350 150 G 1 " G 1 1/2 " G 1/4 "
FOC 15 6 " x 20 " 10500 60-100 472 78 315 366 150 G 1 " G 1 1/2 " G 1/4 "
FOC 20 6 " x 24 " 13500 80-150 606 98 410 500 150 40 NB Flange G 1 1/2 " G 1/4 "
FOC 25 6 " x 30 " 18000 100-190 756 103 550 650 150 G 1 1/2 " G 1/4 "
FOC 30 8 " x 24 " 24000 140-270 606 98 410 500 200 40 NB BSP G 2 " G 1/2 "
FOC 40 8 " x 24 " 32000 180-370 606 98 410 500 200 G 2 " G 1/2 "
FOC 50 8 " x 30 " 34000 220-415 756 118 520 650 200 50 NB BSP G 2 " G 1/2 "
FOC 60 8 " x 36 " 38000 240-456 906 98 710 800 200 G 2 " G 1/2 "
Construction Material
Model
Tubes
Shell
Tubessheet
End Cover
Baffies
Standard Models
Copper IS 1239 ERW IS 2062 CI IS 2062
Marine Application
Cu Ni SS 316 L Brass/AB-2 LG-4 Brass
Max. Operating Pressure (Shell) 10 bar
Max. Operating Pressure (Tube) 5 bar
Max. Operating Temperature 100 0C
Water Flow Rate 1.3 × Oil Flow Rate
Heat Exchange Selection :
Heat Load Q (kW) = m x Cp x Δ T
Where, m = Mass flow rate of oil = Oil flow rate ( LPM ) x p
m (kg/s) = ( LPM x p / 60,000 )
Heat load Q (kW) = m x Cp x (To-Ti)
Heat load Q (k cal /hr) = Q (kW) x 860.4

Heat load Q (kW) = m x Cp x Δ T
Where, m (kg/s) = 40 x 864 / 60,000 = 0.576 kg/s
Heat load Q (kW) = 0.576 x 1.965 x (50-45) = 5.66 kW
Heat load Q (k cal /hr) = 5.66 kW x 860.4 = 4870 k cal/hr
Thus selecting FOC 7.5 Model from Table for above heat load and
oil flow rate. Water flow rate = 1.3 times Oil flow rate
Apart from our standard models, we undertake design of shell and tube
heat exchangers as per customer requirement.

Required Parameters
  • Oil Grade
  • Density of Oil p (kg/m3)
  • Specific Heat of Oil Cp (kJ/kg °C)
  • Oil Inlet Temperature Ti (°C)
  • Oil Outlet Temp Required To (°C)
  • Oil Flow Rate LPM
Assumed Parameters
  • Oil Grade= ISO VG 68
  • Density of Oil p (kg/m3) = 864
  • Specific Heat of Oil Cp (kJ/kg °C) =1.965
  • Oil Inlet Temperature Ti ( °C) = 50
  • Oil Outlet Temp Required To ( °C) = 45
  • Oil Flow Rate LPM = 40
Flowtex Oil Cooling Package Models (AHOC1 - AHOC9)
table
Cooler Model Oil Flow LPM Heat Loan KW A B C D E F G H I J
AHOC1 10-30 2-5 400 369 198 250 200 DIA 12 175 110 DIA 8.5 G 1/2 "
AHOC2 30-70 4-10 527 466 420 350 300 DIA 12 225 110 DIA 11 G 1/2 "
AHOC3 50-90 8-15 540 466 453 350 300 DIA 12 225 110 DIA 11 G1 "
AHOC4 70-130 12-20 657 591 440 350 300 DIA 12 300 150 DIA 11 G 1 1/4 "
AHOC5 100-180 18-26 690 591 473 350 300 DIA 12 300 150 DUA 11 G 1 1/4 "
AHOC6 150-220 25-35 787 760 545 425 375 DIA 14 350 150 DIA 13 G 1 1/4 "
AHOC7 200-270 32-42 820 760 577 425 375 DIA 14 350 150 DIA 13 G 1 1/4 "
AHOC8 250-320 40-50 887 868 565 450 400 DIA 14 415 165 DIA 13 G 1 1/4 "
AHOC9 300-420 45-65 920 868 623 450 400 DIA 14 415 165 DIA 13 G1 1/2 "
Flowtex Oil Cooling Package Models (AHOC10 - AHOC13)
table1
Cooler Model Oil Flow LPM Heat Loan KW A B C D E F G H I J
AHOC10 350-480 60-75 1241 1079 681 450 380 829 1029 18 Ø X 36 G 1/2 " G 1/2 "
AHOC11 400-500 72-85 1241 1079 730 450 380 829 1029 18 Ø X 36 SLOT G2 " G2 "
AHOC12 450-500 85-93 1365 1208 715 450 380 958 1158 18 Ø X 36 SLOT G2 " G2 "
AHOC13 480-520 90-100 1365 1208 731 450 380 958 1158 18 Ø X 36 SLOT G2 " G2 "
Materials :
  • Core : Brazed aluminium bar & plate.
  • Connection : Aluminium female BSP.
  • Fan Cowl : Steel with powder coating finish.
  • Fan Guard : Steel
  • Fan : PAG
  • Motor Bracket : Steel with enamel finish.
  • Motor : Electric motor (Make CGl)
Cooler Type Fan Dia (mm) Fan Speed (RPM) Noise Level dB (A) Motor Voltage / Frequency (+ / 10%) Motor Power HP Three Phase Max. Working Pressure (Bar)
*AHOC1 250 1410 68 380/50 0.5 15
*AHOC2 350 1410 79 415/50 0.75 15
AHOC3 350 1410 79 415/50 0.75 15
AHOC4 450 1410 80 415/50 1 15
AHOC5 450 1410 80 415/50 1 15
AHOC6 550 1410 83 415/50 1.5 15
AHOC7 530 1410 83 415/50 1.5 15
AHOC8 630 1410 85 415/50 1.5 15
AHOC9 630 1410 85 415/50 2 15
AHOC10 750 1440 85 415/50 2 15
AHOC11 750 1440 95 415/50 3 15
AHOC12 900 1440 95 415/50 3 15
AHOC13 900 1440 95 415/50 3 15
Selection Procedure
Design Condition :
  • Oil gRADE : iso vg 68
  • Oil Flow Rate : 10 to 520 LPM
  • Oil Inlet Temperature = 70 0 C
  • Oil Outlet Tempeture = 650C
  • Ambient Air Temperature = 40 0C

Heat Load to be rejected (Q) in kW.
Q = 0.03 x Oil Flow Rate in LPM x (Inlet Oil Temperature - Outlet Oil Temperature)
The Inlet oil temperature is generally the maximum system oil temperature.
The Outlet oil temperature is generally the desired oil temperature from the cooler


E.T.D oC = Inlet Oil Temperature Inlet Air Temperature.
The Inlet Air Temperature is the highest Ambient Air temperature the application will see.


Corrected Heat Load = Q ( kW ) x 30 oC / E.T.D


On the Graph of Heat Load ( kW) v/s Oil Flow Rate (LPM) plot the intersecting point of Corrected Heat Load and Oil Flow Rate. From the graph provided select appropriate model of AHOC. Select the nearest curve above the intersection point of the graph.


From the table of pressure drop (bar) and Oil Flow Rate (LPM), for the selected model of Hydraulic Oil Cooler the corresponding pressure drop indicates the maximum pressure drop for the given maximum oil flow rate.

Example :
Actual Conditions (Assumed):
  • Fluid : ISO VG 68
  • Oil Inlet Temperature : 70 oC
  • Oil Outlet Temperature : 51.8 oC
  • Ambient Temperature : 45oC
  • Flow Rate : 20 LPM.

Q = 0.03 x Oil Flow Rate in LPM x (Inlet Oil Temperature - Outlet oil temperature)
= 0.03 x 20 ( 70 - 51.8 )
= 11 kW.


E.T.D oC = Inlet Oil Temperature - Inlet Air Temperature.
= 70 - 45
= 25oC


Corrected Heat Load = Q ( kW ) x 30·C I E.T.D
= 11 x 301 25
= 13.2 kW.


Find the intersection point between the corrected heat load and flow rate on the performance curves. Any curve above this point will work for this application. In these case the intersection point on the graph indicates AHOC6.


The pressure drop should be found next. From the table of pressure drop ( bar) and max. oil flow rate I for AHOC6 the maximum pressure drop of oil will be 0.92 bar.

Similarly, you can try to select any AHOC models as per your requirement by following the above steps with your technical data.