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. 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 heat exchangers type EM have been designed to be used outdoors, in areas were the level of salinity in the air is high (off-shore application) The components are the following: Aluminum cooling element with anodizing and corrosion proofing treatment (SWAAT test according to ASTM G 85-94 ANNEX A3) Coated AISI 304 stainless steel frame Three-phase electric fan, 400V 50Hz or 480V 60Hz, with IP 56 protection degree and stainless steel protection grill for off-shore application Fixed thermo-switch (47-36°C or 60-49°C) IP 65 protection degree For the right calculation of air-oil heat exchangers, we supply our customers with a calculation software. The air-oil heat exchangers can be used to cool other kind of fluids, which must be compatible with aluminum and its alloys. However, for each use, with the exception of oil cooling, we recommend to consult our Technical Department.

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