They are two of the most important inputs, and they work together. Oil flow rate and the temperature differential (how many degrees you must remove from the oil and how far the oil sits above the cooling medium) determine the heat load and the heat transfer driving force. Get either wrong, and the exchanger will be undersized (oil runs hot, seals and fluid degrade) or oversized (wasted cost, overcooled oil, slow warm-up). Heat load, cooling medium temperature, viscosity, and pressure drop complete the sizing picture.
Hydraulic systems turn wasted energy into heat. That heat must leave the system at the same rate it is generated, or oil temperature climbs until something fails. A heat exchanger is the component that guarantees this balance, and sizing it correctly starts with understanding how flow rate and temperature differential drive the calculation
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