Wider range of heat exchangers for hydraulics
A
JBJ Techniques product story
Edited by the Engineeringtalk editorial team
Jul 24, 2000
The full range of Emmegi air-oil and water-oil heat exchangers is now available from JBJ, for cooling of hydraulic systems and normally installed on the return line
In hydraulic systems, energy losses converted into waste thermal energy can alter the fluid temperatures throughout.
To avoid this, it is sometimes necessary to incorporate a heat exchanger into the circuit.
The full range of Emmegi air-oil and water-oil heat exchangers is now available from JBJ.
Both air-oil and water-oil heat exchangers are used for cooling of hydraulic systems and are normally installed on the return line.
The main body of the air-oil systems, such as the MG Air 2000-K series and the HPA series, is fabricated from aluminium alloy using a special brazing process.
Turbulators are used to create controlled turbulent flow to optimise heat dissipation rates, which are up to 300,000 kcal/h.
The maximum oil flow rate is 700 litres/min.
The MG Air 2000-K series is designed for an oil flow of 60 litres/min and has cooling power of 15kW.
The HPA series operates at 120 litres/min and 35kW.
Operating from a single, three-phase DC electric motor or hydraulic motor, working pressures up to 26 bar are possible.
As well as in hydraulic systems, these air-oil coolers ar eused in engines, air compressors and agricultural machinery, earth moving equipment and other off-road vehicles.
Water-based systems can transfer heat through one, two or four water passes, across a cooling surface area which ranges from 0.11 to 10m2.
Heat dissipation rates are up to 300,000kcal/h.
The heat exchangers can be supplied with thermostats to minimise water consumption.
The maximum oil flow rate is 800 litres/min.
They operate up to a working pressure of 40bar and feature an extruded steel body with copper tube bundle, copper connections and covers.
Typical industrial installations include food machinery, machine tools and injection moulding machines.
Special versions are available which operate satisfactorily in sea water and can be used with marine engines and turbines.
In many cases, however, it is not possible to connect the heat exchanger directly into the return circuit, owing to the presence of hammering and variable oil flows.
In this case, an off-line air/oil cooling unit, such as the CSU, can be used.
Based on a recycling principle and connected to the tank by flexible tubing, the unit takes the oil from circulation, cools it and then returns it to circulation.
For this unit to operate satisfactorily, there must be sufficient air circulation to prevent warm air interfering with the thermal exchange mechanism.
Also, the inlet and outlet tubes must be at least as large as those in the hydraulic circuit, to avoid cavitation effects, which can increase the noise in the system and in extreme cases cause damage to the pump.
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