The advantage of using air into the cooling of oleo hydraulic systems has its bases on the following facts:
• There is no need of water
• The system is independent of the connection to the water main
• Lower working costs in comparison with the water-oil exchangers, even if the starting investment is higher
• Possibility to use warm air to heat the room in winter.
The particular structure of the cooling element allows great thermic performances and pressure resistance.
Maximum working static pressure: 20 bar; test pressure: 35 bar.
Out technical Department is available to suggest and find the better solution in case of particular working conditions, pressures, frequencies, vibrations, etc.
It is always recommended to assemble in parallel with the exchanger a by-pass valve to avoid extreme counter-pressures, particularly when the machine is started with cold oil. On the contrary, it is not useful to use a check valve as by-pass to protect the exchanger from pressure’s peaks, since the inertia of the valve itself is too high in comparison with the speed of the pressure waves that occur into the oleo hydraulic systems.
The flow rates shown in the tables are the ones recommended for the exchanger proper working.
The efficiency curves show the specific exchange capacity in kcal/ h°C or in kW/°C according to the different oil rates. To calculate the heat quantity the different exchangers are able to dissipate it is enough to multiply such capacity by the difference between the requested oil temperature and the summer room temperature.
The electric system of these exchangers is already wired, according to EN 20204 Regulation.
Starting from the type AP 300, all the exchangers of this series are equipped with an adjustable thermo switch, which allows keeping the oil temperature between 30°C and 90°C, according to the different needs.
Particular attention is paid to the noise of our fans that, working into industrial factories and close to the operators, should have low noise levels but at the same time should have the proper exchange efficiency.
For the right calculation of air-oil heat exchangers, we supply our customers with a calculation program on CD-ROM or that can be downloaded from our website.
The air-oil heat exchangers can be used to cool other kind of fluids, which must be compatible with aluminium and its alloys.
However, for each use, with the exception of oil cooling, we recommend to consult our Technical Department.