Hydraulic Cooler Sizing

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This page describes how to size a hydraulic oil cooler for a hydraulic system. Hydraulic coolers are often specified by their ability to dissipate heat - usually measured in BTU/hr.


1. The power in the hydraulic system:

Horsepower = Pressure * Flow / 1714

2. The heat dissipated in a hydraulic system can be determined by summing the inefficiencies of all components in the system, but is usually between 25% adn 30%. The heat dissipated is measured in BTU/hr:

Heat dissipated = Horsepower * 0.3 * 2542

Here are some values for OSE engines:

Engine hp Formula Heat dissipated
28 28 * 0.3 * 2542 21352 BTU/hr
50 50 * 0.3 * 2542 38130 BTU/hr
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