AIR OIL EXCHANGERS
- DC motor heat exchanger
DC motor heat exchanger
The exchangers of this series are particularly used to cool oleohydraulic plants on movable machines; they are equipped with solenoid valves at direct current at 12 or 24 V.
The radiative pack is made of aluminium because this material is a very good conductor; this allows great thermic yields and relatively little over-all dimensions. Thanks to the particular structure of the radiative pack the exchangers of the series APL are very resistant to the stresses produced by water hammers which, as peak values, must not exceed the minimum allowable dynamic pressure of 20 bar.
The maximum allowable static pressure is of 35 bar.
It is 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.
For a good exchanger working some oil rates are indicated in the tables. Going down the lowest rate of flow, the low oil speed causes a great loss in yield, whereas a rate of flow which is superior to maximum indicated, causes great losses of pressure and does not considerably increase the thermal yield.
The yield curves indicate 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 disperse it is enough to multiply such capacity by the difference between the requested oil temperature and the summer room temperature.
The components have been carefully chosen in order to supply the customer with a reliable product. In particular the fans have long life and all of them have a very high electric protection, IP 64, like the stationary thermostat, available with two different calibrations, , 47°C o 60°C, with protection IP 65.
The thermostat calibration shows the initial temperature of the fans; the stop temperature is lower of 11°C. We must consider that the tolerance on the above mentioned operating temperatures is ±5°C.
If the exchanger is equipped with thermostat, the electric system has a relay, which is inside a pull box with protection IP 65.