OEM:Air to Oil Cooler Selection

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PERFORMANCE REQUIREMENTS
The following information is required to select an air to oil cooler.
Heat Load	Click for more information kW hp (tick correct unit)
Oil Flow Rate	This is simply the flow rate of the oil circulating through the cooler. litres/minute
Oil Type	Advise oil grade or viscosity vs temperature details. (eg ISO 68)
Maximum desired oil temperature	Oil coolers are typically sized using the maximum desired oil temperatures. Typical temp. ranges are: Hydraulic oil 43 - 54°C Hydrostatic drive oil 54 - 82°C Bearing lube oil 49 - 71°C Lube oil circuits 43 - 54°C °C
Maximum allowable oil pressure drop	Most systems can tolerate a pressure drop through the heat exchanger of 1.5 to 2 Bar. Excessive pressure drop should be avoided. Care should be taken to limit pressure drop to 0.3-0.5 Bar for case drain applications where high back pressure will blow out pump shaft seals. Bar PSI
Cooling ambient air temperature	Cooling air temperature: This is the temperature of the air entering the cooler, also referred to as the ambient air temperature. A normal maximum air temperature is usually between 32°C to 38°C. Care should be taken not to install in confined space as ambient temperature will increase and cause overheating. °C
Motor Data	Most models are available with a wide variety of motors. List as desired. Be sure to indicate any special requirements. 12V 24V 240V 415V Hydraulic No Motor Other:
Maximum Envelope	This may be any height, width and depth depending on the application. Allowances should be given so as not to obstruct fan air flow. Height x Width x Depth (mm) x x
Air face velocity (mobile cores only)	Typically oil coolers are sized for 5.5m/s (20 kph) air velocity. When an air volume flow is given in m3/s, it may be converted by: (face velocity m/s) = (flow rate m³/s) / (face area of core m²). m/s
Maximum pressure cooler will be subject to	Bar PSI
Are any cylinders or other pressure spike producing components in the cooler circuit?	Click for more information No Yes, give details:
Any additional information about your circuit or environment that will help with the selection of your cooler.

MORE INFORMATION
Heat Load The heat load may be determined by: A. Hydraulic oil cooling: Assume 30% of the input power will be rejected to heat. If the input power is unknown, this formula may be used: kW= (system press. Bar) x (L/min flow) x 0.00167 B. Hydrostatic oil cooling: Assume 25% of the input power will be rejected to heat. C. Heat load test: the heat load can be determined by actually measuring the degree temperature rise from a cold start-up. This temperature rise is the exact amount of heat going into the oil. To run a heat load test, disconnect any heat exchanger in the test loop. Record the increase in oil temperature every 5 minutes. Review the data received, and determine the greatest temperature rise in any 5 minute period. Heat load = system volume x oil heat capacity x (T2 - T1) / 5 minutes x 60 sec./min For example - Initial oil temp 40°C Final oil temp 50°C Time for temp rise 5 minutes System oil volume 240 litres Oil heat capacity 1.72 kJ/L°C Heat Load = 240 x 1.72 x (50-40) / 5 x 60 = 13.8 kW Back to form Cylinders or other pressure spike producing components Do not install aluminium oil cooler elements in circuits where sudden changes of pressure or oil flow are likely to occur. Eg:- Cylinder circuits or circuits with oscillating valves. Use of this type of cooler in such circuits will result in rupture of the tubes or cracking of tube to header joints. Aluminium is also subject to fatigue failure under high frequency pressure and/or temp cycling. Bypass relief valves or accumulators are not effective against pressure spikes. For these applications refer to DP & HL off-line coolers. Back to form