ASA Hydraulik

Applications, Uses and Selection of Coolers

ISO 9001:2000

Oil to Air Heat Exchangers and Oil to Water Heat Exchangers
For Mobile and Industrial Applications

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Applications for Coolers, Use of Coolers in the System, Cooler Selection

1. Application of coolers :

Removal of heat in hydraulic systems
Cooling of motor oil
Cooling of retarder oil
Cooling of hardening oils
Cooling of transformer oils
Mobile applications – especially agricultural applications with biological oils
Cooling of water-glycol mixtures
If there is no cooler in a system, the thermal energy absorbed by the oil is higher than the energy that can be removed by convection and radiation. This leads to a overheating of the oil which can result in shorten oil life, leakage, premature wear, seal hardening, etc.

Use applications from branch for descriptive purposes.

2. Use of coolers in the system :

a) Return line
b) As circulation unit
c) In feeding circuit of closed systems
Advantage – Disadvantages of different types of coolers in a system.

3. Cooler selection :

To determine the right cooler size for an application we need to know the thermal energy that needs to be absorbed. There are calculations for approximating the required heat rejection.

The common measurement of HEAT DISSIPATION of a cooler is in KW, BTU/Hr or Horsepower. Energy that is put into the system that does not do useful work is convert into heat. The energy applied to the system multiplied by the systems efficiency will give the percentage of energy generating heat. The input energy and system efficiency are generally know or can be estimated. Hydraulic circuits with constant pumps have a general efficiency from 70%-75%. Circuits with variable pumps from 80%-85%.

For more detail and an example see page 4 of the catalog.

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