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How to use the tanks / reservoirs

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  • How to use the tanks / reservoirs

    Automation Studio™ proposes several types of tanks/reservoirs, this thread will try to explain the particularity of each, the operation condition and which one should be used in different application. One of the model is the Hydrostatic Reservoir, for this reservoir the connector is below the fluid level. By default this reservoir is set to have an infinite volume, so the user will never run out of fluid and the hydrostatic pressure will be equivalent to the "Initial Height". If the parameter "Infinite Volume" is set to FALSE, the parameters "Initial Volume" and "Initial Height" will be considered. If the fluid height changes during simulation, this will cause a hydrostatic pressure on the connector which is lying at the bottom of the reservoir. Please note that when the "Infinite Volume" property is set to TRUE, the "Initial Height" is also considered for the hydrostatic pressure, but the "Initial Volume" is useless. This situation can be compared to an incredibly large lake that has the same depth everywhere in which you are pumping your fluid.

    Ports One port, but can receive many lines
    Plot variables Flow, Fluid Height, pressure
    Dynamic instruments Flow, Fluid Height, Pressure and Total Compressed Volume
    Controller or Graph Generators Fluid Height
    Can be used as an accessory Yes
    Failures / troubleshooting External leak, Restricted port, Blocked port

    This reservoir can be used for most mobile and industrial hydraulics applications. Since each symbol represent one reservoir, if an application requires only one tank, other reservoir, such as Multiport or customized one may be more appropriate. Multiport Hydrostatic Reservoir, has all the properties and features of the Hydrostatic Reservoir but can have many ports, ports which can be modify using the variable Number of ports from the Data tab. Application note: This reservoir can be used for most mobile and industrial hydraulics applications. Compare to the one port version, this multiport can be used to represent the unique tank of a complete system. This reservoir is more appropriate to perform analysis that requires a finite volume of oil that is recirculating, such as in thermal exchange of a hydrostatic transmission. Atmospheric Reservoir, it is a reservoir in which the connector is slightly over the fluid level. Therefore, this kind of reservoir will be very helpful for the return lines because no back pressure will be produced.

    Ports One port, but can receive many lines
    Plot variables Flow, Input pressure
    Dynamic instruments Flow, Fluid Height, Pressure and Total Compressed Volume
    Controller or Graph Generators N/A
    Can be used as an accessory Yes
    Failures / troubleshooting External leak, Restricted port, Blocked port

    Multiport Atmospheric Reservoir, has all the properties and features of the Atmospheric Reservoir but can have many ports, ports which can be modify using the variable Number of ports from the Data tab. Pressure-Sealed Reservoir, is considered empty and pressurized. All connectors (1 to 3) are connected into the same reservoir's compartment, so the pressure is equal on all of these connectors. When the simulation is launched, the pressure on the connectors is defined by the "Precharge" value. Reservoir, same as Hydrostatic Reservoir, different symbol. Custom Reservoir, The properties of the data branch are similar than other reservoir. Note that model types can be selected between “No overflow” and “Overflow”. With the overflow model, when the reservoir reach maximum filling volume, the oil will begin to flow out or make the reservoir pressurized. It is considered with a square geometry. The customized reservoir can be configured using its builder to match the user layout needs. Under the Builder branch, the user can set the number of connectors, where they will be located on the reservoir edges, the height of each one and also set their flow coefficient (Cv or Kv). Sensors can also be integrated on the reservoir for pressure, temperature or level readings. Under the Builder branch also the user can configure the tank based on height, maximum volume, internal cross section and volume; depending which combination was chosen, the Technical – Characteristic variables will be available or not. The flow coefficient can be changed also from Kv to Cv and adjusted to simulate port size. The number of ports vertical and horizontal can be modified. Once the number of ports are selected, but the ports are not configured, they will have an “?”.

    tank.png

    By configure a port it means: “Add connector” using the icons from the top of the window, the port will turn red “Add sensors” using the icons (Add sensor) from the top of the window Modify the “Input Kv” and “Output Kv” the height or the volume depending of the setting from the Configuration mode. Modify the “Flow Direction”

    Ports Variable on 2 directions
    Plot variables Fluid Height, Temperature
    Dynamic instruments Fluid Height, Temperature and Total Compressed Volume
    Controller or Graph Generators Fluid Height, Sensor, Temperature
    Can be used as an accessory Yes
    Failures / troubleshooting External leak, Restricted port, Blocked port

    Application note: This reservoir is suitable for more advance applications where the reservoirs characteristics and behaviors is important in specific analysis. To name a few:
    • When it is required to know the oil levels and activate sensors accordingly;
    • When reservoir needs to be considered in a thermal analysis as a heat generator through his restrictive ports (“Kv” or “Cv” factor on ports) or as a heat dissipation device by defining its size and “Heat transfer coefficient”;
    • When you desire to simulate a pressurized case drain full of oil for components such as pumps and motors in hydrostatic transmission, using the “Overflow” model.
    Other aspects common to all tanks/reservoirs The parameter "Infinite Volume" it is very important for a thermal evolution, if this is something you want to evaluate, the option "Infinite Volume" has to be set to False and the "Initial Volume" value has to be realistic for the size of the system to be analyzed. Another aspect for the thermal evolution is that the tank/reservoir has to be unique for the installation you try to evaluate the temperature evolution. For more detailed information please use “?” from the Data tab.
    Best Regards,
    Forum Admin
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