Engee documentation

Fixed-Displacement Pump (TL)

A constant-volume pump in a heat-conducting fluid network.

blockType: EngeeFluids.ThermalLiquid.Turbomachinery.FixedDisplacementPump

fixed displacement pump tl

Path in the library:

/Physical Modeling/Fluids/Thermal Liquid/Pumps & Motors/Fixed-Displacement Pump (TL)

Description

The Fixed-Displacement Pump (TL) block It is a pump that receives energy from a mechanical rotary system and transmits it to a heat-conducting fluid network. The working volume of the pump is fixed at a constant value, which is set using the Displacement parameter.

Ports A and B represent the pump inlet ports. Ports R and C represent the drive shaft and pump housing. The liquid flow can be directed from port A to port B (forward mode) or from port B to port A (reverse mode). Operation in the pump mode occurs when the pressure in the flow direction increases. The operation mode of the hydraulic motor occurs when the pressure drops in the flow direction.

_ Modes of operation_

fixed displacement pump il 1

The unit has four operating modes. The operating mode depends on the pressure drop from port A to port B and angular velocity :

  • Mode 1, Direct pump mode: the positive angular velocity of the shaft causes pressure to rise from port A to port B and flow from port A to port B.

  • Mode 2, reverse hydraulic motor mode: the flow from port B to port A causes a decrease in pressure from port B to port A and a negative angular velocity of the shaft.

  • Mode 3, Reverse pump mode: the negative angular velocity of the shaft causes pressure to rise from port B to port A and flow from port B to port A.

  • Mode 4, direct hydraulic motor mode: the flow from port A to port B causes a decrease in pressure from port A to port B and a positive angular velocity of the shaft.

The time constant of the pump is negligible compared to the time constant of the system. The pump reaches a steady state almost instantly and is considered as a quasi-stationary component.

Energy conservation

The mechanical work performed by the pump is related to the exchange of energy. The energy conservation equation has the form:

where

  • and — energy flows in ports A and B respectively;

  • — hydraulic power of the pump. It is a function of the pressure difference between the pump ports: .

The mechanical power of the pump is determined from the torque and angular velocity :

Flow rate and torque

The mass flow rate of the pump is:

where

  • — actual mass consumption;

  • — ideal mass flow rate;

  • — mass consumption of internal leakage.

The torque required to actuate the pump is:

where

  • — actual torque;

  • — perfect torque;

  • — the moment of friction.

The ideal flow rate and ideal torque are calculated as




where:

  • — the average value of the liquid density in the ports of the heat-conducting liquid A and B;

  • — value of the Displacement parameter;

  • — angular rotation speed of the shaft;

  • — pressure increase from inlet to outlet.

Analytical parameterization of leakage and friction moment

If the Leakage and friction parameterization parameter is set to Analytical, the unit calculates the leakage and friction moment based on the nominal values of shaft rotation speed, pressure drop, mechanical and volumetric efficiency. The leakage rate, which depends on the pressure drop across the hydraulic motor, is calculated as:

and the moment of friction is calculated as:

where

  • — the Hagen-Poiseuille coefficient for laminar flows. The unit calculates this coefficient from the specified nominal parameters;

  • — the average dynamic viscosity of the liquid in the ports;

  • — average density of liquid in ports;

  • — coefficient of dependence of the moment of friction on pressure at nominal working volume, which is determined by the value of the parameter Mechanical efficiency at nominal conditions, :

    where — the moment of friction under nominal conditions:

  • — pressure increase for a given volumetric efficiency, the value of the parameter Nominal pressure gain. This value represents the pressure increase factor at which the nominal volumetric efficiency is indicated.;

  • — value of the No-load torque parameter;

  • — angular velocity for a given volumetric efficiency, the value of the parameter Nominal shaft angular velocity. This value represents the angular velocity at which the unit sets the nominal volumetric efficiency.

The unit determines the Hagen-Poiseuille coefficient based on the nominal parameters of the liquid and components

where:

  • — dynamic viscosity for a given volumetric efficiency, the value of the parameter Nominal Dynamic viscosity. This value represents the dynamic viscosity at which the unit determines the nominal volumetric efficiency.;

  • — volumetric efficiency under nominal conditions, the value of the parameter Volumetric efficiency at nominal conditions, is the volumetric efficiency corresponding to the specified nominal conditions.

Tabular data for parameterization

When using tabular data for the efficiency or losses of a hydraulic motor, data can be provided for one or more operating modes. The signs of the tabular data determine the operating mode of the block. If data is provided for less than four operating modes, the block calculates additional data for another mode(s), expanding the specified data into the remaining quadrants.

Tabular data — parameterization of volumetric and mechanical efficiency

If the Leakage and friction parameterization parameter is set to Tabulated data - volumetric and mechanical efficiencies, the block performs parameterization based on tabular data for volumetric and mechanical efficiency.

The leakage rate is:

and the moment of friction is:

where

  • — numerical smoothing parameter for the transition process from the hydraulic motor to the pump;

  • — leakage rate in pump mode;

  • — leakage rate in hydraulic motor mode;

  • — the moment of friction in the pump mode;

  • — the moment of friction in the hydraulic motor mode.

Smoothing parameter is defined by a hyperbolic function

where

  • — the value of the parameter Pressure gain threshold for motor-pump transition;

  • — the value of the Angular velocity threshold for motor-pump transition parameter.

The volumetric flow rate is calculated based on volumetric efficiency, a value that is set in tabular form in the using the Volumetric efficiency table block parameter.

When operating in pump mode, the leakage rate is:

where — volumetric efficiency obtained by interpolation or extrapolation of tabular data.

Similarly, when operating in the hydraulic motor mode, the leakage rate is:

The moment of friction is calculated in a similar way from the mechanical efficiency, a value that is set in tabular form in the area of using the Mechanical efficiency table block parameter.

When operating in pump mode, the friction moment is:

where — mechanical efficiency, obtained either by interpolation or extrapolation of tabular data.

Similarly, when operating in the hydraulic motor mode, the friction moment is:

Tabular data — parameterization of volume and mechanical losses

If the Leakage and friction parameterization parameter is set to Tabulated data - volumetric and mechanical loss, then the leakage volume flow rate is set directly in tabular form in the :

The mass flow rate of the leak is calculated from the volume flow rate:

The moment of friction is:

where and — volumetric and mechanical losses obtained by interpolation or extrapolation of tabular data specified in the Volumetric loss table and Mechanical loss table parameters.

Parameterization via the input signal

If the Leakage and friction parameterization parameter is set to Input signal - volumetric and mechanical efficiencies', then ports EV and EM are enabled. Internal leakage and shaft friction are calculated in the same way as with the parameterization of `Tabulated data - volumetric and mechanical efficiencies, except that the efficiency values and They are delivered directly to the EV and EM ports, respectively.

Efficiency is a positive value with a value between 0 and 1'. The values of the input signals outside these boundaries are set equal to the nearest boundary (`0 for inputs less than 0 and 1 for inputs greater than 1). Volumetric and mechanical efficiency vary between user-defined minimum and maximum values. Any values below or above this range will take the minimum and maximum set values, respectively.

If the Leakage and friction parameterization parameter is set to `Input signal - volumetric and mechanical losses', then ports LV and LM are enabled. These ports receive the values of the leakage current and the moment of friction in the form of positive scalars.

Assumptions and limitations

  • The pump is considered as a quasi-stationary component.

  • The effects of fluid inertia and height differences are ignored.

  • The walls of the hydraulic motor are considered rigid.

  • External leaks are ignored.

Ports

Conserving

# R — mechanical port
`rotational mechanics

Details

Angular velocity of rotation and torque of a shaft.

Program usage name

rod_flange

# C — mechanical port
`rotational mechanics

Details

Angular velocity of rotation and torque of the body.

Program usage name

case_flange

# A — thermal liquid port
thermal liquid

Details

The fluid inlet or outlet port of a pump.

Program usage name

port_a

# B — thermal liquid port
thermal liquid

Details

The fluid inlet or outlet port of a pump.

Program usage name

port_b

Input

# EV — volumetric efficiency
scalar

Details

Volumetric efficiency specified as a scalar. The value must be in the range from 0 to 1.

Dependencies

To use this port, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Data types

Float64.
Complex numbers support

No

# EM — mechanical efficiency
scalar

Details

The mechanical efficiency of the pump, given as a scalar. The value must be in the range from 0 to 1.

Dependencies

To use this port, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Data types

Float64.
Complex numbers support

No

# LV — leakage volume flow rate
scalar

Details

Pump losses, in m3/s, given as a scalar.

Dependencies

To use this port, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical losses'.

Data types

Float64.
Complex numbers support

No

# LM — friction moment
scalar

Details

The mechanical losses of the pump, in N⋅m, given as a scalar.

Dependencies

To use this port, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical losses'.

Data types

Float64.
Complex numbers support

No

Parameters

Parameters

# Leakage and friction parameterization — method for calculating leakage flow rate and friction torque
Analytical | Tabulated data - volumetric and mechanical efficiencies | Tabulated data - volumetric and mechanical losses | Input signal - volumetric and mechanical efficiencies | Input signal - volumetric and mechanical losses

Details

Parametrization of pump leakage and friction characteristics:

  • `Analytical' - leakage flow and friction torque are calculated using analytical equations.

  • Tabulated data - volumetric and mechanical efficiencies - volumetric and mechanical efficiencies are calculated from the user defined parameters Pressure gain vector, dp and Shaft angular velocity vector, w and interpolated from the corresponding two-dimensional tables Volumetric efficiency table, e_v(dp,w) and Mechanical efficiency table, e_m(dp,w).

  • `Tabulated data - volumetric and mechanical loss' - leakage flow rate and friction torque are calculated from the user defined parameters Pressure gain vector, dp and Shaft angular velocity vector, w and interpolated from the corresponding two-dimensional tables Volumetric loss table, q_loss(dp,w) and Mechanical loss table, torque_loss(dp,w).

  • `Input signal - volumetric and mechanical efficiencies' - volumetric and mechanical efficiencies are input as signals to the EV and EM ports respectively.

  • Input signal - volumetric and mechanical loss - leakage flow rate and friction torque are input as signals to ports LV and LM respectively.

Values

Analytical | Tabulated data - volumetric and mechanical efficiencies | Tabulated data - volumetric and mechanical losses | Input signal - volumetric and mechanical efficiencies | Input signal - volumetric and mechanical losses
Default value

Analytical
Program usage name

leakage_and_friction_parameterization
Evaluatable

No

# Displacement — working volume
l/rad | l/rev | gal/rad | gal/rev | igal/rad | m^3/deg | m^3/rad | m^3/rev | cm^3/rad | cm^3/rev | mm^3/rad | km^3/rad | ft^3/rad | in^3/deg | in^3/rad | in^3/rev | N*m/Pa/rad | N*m/bar/rad | lbf*ft/psi/rad

Details

The volume of fluid displaced when the shaft is rotated by a certain angle. The unit stores this value throughout the simulation.

Units

l/rad | l/rev | gal/rad | gal/rev | igal/rad | m^3/deg | m^3/rad | m^3/rev | cm^3/rad | cm^3/rev | mm^3/rad | km^3/rad | ft^3/rad | in^3/deg | in^3/rad | in^3/rev | N*m/Pa/rad | N*m/bar/rad | lbf*ft/psi/rad
Default value

30.0 cm^3/rev
Program usage name

displacement
Evaluatable

Yes

# Nominal shaft angular velocity — nominal angular speed of the shaft
rpm | deg/s | rad/s

Details

The angular speed of the rotating shaft corresponding to a given volumetric efficiency. This value under standard operating conditions is usually given in the manufacturer’s specification. The unit uses this parameters to calculate leakage flow and friction torque.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameter to `Analytical'.

Units

rpm | deg/s | rad/s
Default value

1800.0 rpm
Program usage name

w_nominal
Evaluatable

Yes

# Nominal pressure gain — nominal pressure increase between inlet and outlet
Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar

Details

The pressure increase corresponding to the specified volumetric efficiency. This value under standard operating conditions can usually be found in the manufacturer’s specification. The unit uses this parameters to calculate the internal leakage flow rate.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameter to `Analytical'.

Units

Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar
Default value

10.0 MPa
Program usage name

p_nominal
Evaluatable

Yes

# Nominal dynamic viscosity — nominal dynamic viscosity for a given volumetric efficiency
P | cP | reyn | s*uPa

Details

The nominal dynamic viscosity of the fluid corresponding to a given volumetric efficiency. This value under standard operating conditions can usually be found in the manufacturer’s specification. The unit uses this parameters to calculate the internal leakage flow rate.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameter to `Analytical'.

Units

P | cP | reyn | s*uPa
Default value

0.9 cP
Program usage name

mu_nominal
Evaluatable

Yes

# Volumetric efficiency at nominal conditions — volumetric efficiency at nominal conditions

Details

The ratio of the actual flow rate to the ideal flow rate under nominal conditions. This value under standard operating conditions can usually be found in the manufacturer’s specification. The unit uses this parameters to calculate the internal leakage flow rate.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameter to `Analytical'.

Default value

0.92
Program usage name

nominal_volumetric_efficiency
Evaluatable

Yes

# Mechanical efficiency at nominal conditions — mechanical efficiency at rated conditions

Details

The ratio of the actual torque to the ideal torque produced under nominal conditions.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Analytical'.

Default value

0.88
Program usage name

nominal_mechanical_efficiency
Evaluatable

Yes

# No-load torque — rest friction torque
N*m | mN*m | lbf*ft

Details

The minimum torque value to overcome seal friction. This torque is the load-independent component of the total friction torque.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameter to `Analytical'.

Units

N*m | mN*m | lbf*ft
Default value

0.0 N*m
Program usage name

no_load_torque
Evaluatable

Yes

# Pressure gain vector, dp — vector of pressure increase values for tabular parameterization
Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar

Details

Vector of differential pressure values for the tabular parameterization of leakage and torque friction. The elements of the vector must be listed in ascending order.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical efficiencies'.

Units

Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar
Default value

[0.1, 1.0, 2.0] MPa
Program usage name

delta_p_vector_efficiency
Evaluatable

Yes

# Shaft angular velocity vector, w — vector of angular velocity values for tabular parameterization
rpm | deg/s | rad/s

Details

Vector of angular velocity data for tabular parameterization of leakage and friction torque. The elements of the vector must be listed in ascending order.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical efficiencies'.

Units

rpm | deg/s | rad/s
Default value

[250.0, 500.0, 1000.0, 2000.0, 3000.0, 4000.0] rpm
Program usage name

w_vector_efficiency
Evaluatable

Yes

# Volumetric efficiency table, e_v(dp,w) — table of volumetric efficiency values

Details

Matrix at of volumetric efficiencies at a given fluid pressure drop and angular speed of shaft rotation. The block uses linear interpolation between the elements of the table.

The values and are the dimensions of the corresponding vectors:

  • - number of vector elements in the Pressure gain vector parameters, dp.

  • - number of vector elements in the Shaft angular velocity vector parameters, w.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical efficiencies'.

Default value

[0.816 0.908 0.954 0.977 0.981 0.984; 0.325 0.663 0.831 0.916 0.925 0.946; 0.137 0.568 0.78 0.892 0.893 0.910]
Program usage name

volumetric_efficiency_matrix
Evaluatable

Yes

# Mechanical efficiency table, e_m(dp,w) — table of mechanical efficiency values

Details

Matrix at mechanical efficiencies at a given fluid pressure drop and angular speed of shaft rotation. The block uses linear interpolation between the elements of the table. The values and are the dimensions of the corresponding vectors:

  • - number of elements in the pressure drop vector Pressure gain vector, dp.

  • - number of elements in the angular velocity vector Shaft angular velocity vector, w.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical efficiencies'.

Default value

[0.996 0.996 0.996 0.996 0.996 0.996; 0.988 0.989 0.989 0.989 0.989 0.990; 0.981 0.981 0.982 0.982 0.983 0.984]
Program usage name

mechanical_efficiency_matrix
Evaluatable

Yes

# Pressure gain vector, dp — vector of pressure increase values for tabular parameterization
Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar

Details

Vector of pressure increase values for the tabular parameterization of leakage and torque friction. The elements of the vector must be listed in ascending order.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical losses'.

Units

Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar
Default value

[0.1, 1.0, 2.0] MPa
Program usage name

delta_p_vector_loss
Evaluatable

Yes

# Shaft angular velocity vector, w — vector of angular velocity values for tabular parameterization
rpm | deg/s | rad/s

Details

Vector of angular velocity data for tabular parameterization of leakage and friction torque. The elements of the vector must be listed in ascending order.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical losses'.

Units

rpm | deg/s | rad/s
Default value

[250.0, 500.0, 1000.0, 2000.0, 3000.0, 4000.0] rpm
Program usage name

w_vector_loss
Evaluatable

Yes

# Volumetric loss table, q_loss(dp,w) — table of volume loss values
m^3/s | m^3/h | cm^3/s | mm^3/s | ft^3/s | lpm | l/s | gpm | gal/s | gal/h

Details

Matrix at volume losses at a given fluid pressure drop and angular speed of shaft rotation. The block uses linear interpolation between the elements of the table.

The values and are the dimensions of the corresponding vectors:

  • - number of elements in the pressure gain vector Pressure gain vector, dp.

  • - number of elements in the angular velocity vector Shaft angular velocity vector, w.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical losses'.

Units

m^3/s | m^3/h | cm^3/s | mm^3/s | ft^3/s | lpm | l/s | gpm | gal/s | gal/h
Default value

1e-3 * [0.0230 0.0230 0.0230 0.0230 0.0285 0.0320; 0.0844 0.0842 0.0845 0.0840 0.1125 0.1080; 0.1079 0.1080 0.1100 0.1080 0.1605 0.1800] m^3/s
Program usage name

volumetric_loss_matrix
Evaluatable

Yes

# Mechanical loss table, torque_loss(dp,w) — table of mechanical loss values
N*m | mN*m | lbf*ft

Details

Matrix at of mechanical losses at a given fluid pressure drop and angular speed of shaft rotation.

The block uses linear interpolation between the elements of the table. The values and are the dimensions of the corresponding vectors:

  • - number of elements in the pressure gain vector Pressure gain vector, dp.

  • - number of elements in the angular velocity vector Shaft angular velocity vector, w.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Tabulated data - volumetric and mechanical losses'.

Units

N*m | mN*m | lbf*ft
Default value

[0.0020 0.0020 0.0020 0.0020 0.0020 0.0020; 0.0607 0.0556 0.0556 0.0556 0.0556 0.0505; 0.1937 0.1937 0.1833 0.1833 0.1729 0.1626] N*m
Program usage name

mechanical_loss_matrix
Evaluatable

Yes

# Minimum volumetric efficiency — minimum volumetric efficiency

Details

The minimum value of the volumetric efficiency. If the input signal is below this value, the volumetric efficiency is set to the minimum volumetric efficiency value.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Default value

1e-3
Program usage name

min_volumetric_efficiency
Evaluatable

Yes

# Maximum volumetric efficiency — maximum volumetric efficiency

Details

The maximum value of the volumetric efficiency. If the input signal exceeds this value, the volumetric efficiency is set to the maximum volumetric efficiency value.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Default value

1.0
Program usage name

max_volumetric_efficiency
Evaluatable

Yes

# Minimum mechanical efficiency — minimum mechanical efficiency

Details

The minimum value of the mechanical efficiency. If the input signal is below this value, the mechanical efficiency is set to the minimum mechanical efficiency value.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Default value

1e-3
Program usage name

min_mechanical_efficiency
Evaluatable

Yes

# Maximum mechanical efficiency — maximum mechanical efficiency

Details

The maximum value of the mechanical efficiency. If the input signal is higher than this value, the mechanical efficiency is set to the maximum mechanical efficiency value.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical efficiencies'.

Default value

1.0
Program usage name

max_mechanical_efficiency
Evaluatable

Yes

# Pressure gain threshold for pump-motor transition — threshold pressure for transient operation
Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar

Details

The differential pressure threshold for the transition between pump and motor operation. The transition region is defined in the region of 0 MPa between the positive and negative values of the threshold differential pressure. Within this region, the calculated leakage rate and friction torque are corrected according to the transition term , to ensure a smooth transition from one mode to the other.

Dependencies

To use this parameter, set Leakage and friction parameterization to one of the values:

  • `Tabulated data - volumetric and mechanical efficiencies';

  • `Input signal - volumetric and mechanical efficiencies';

  • Input signal - volumetric and mechanical losses.

Units

Pa | GPa | MPa | atm | bar | kPa | ksi | psi | uPa | kbar
Default value

1e-3 MPa
Program usage name

p_threshold
Evaluatable

Yes

# Angular velocity threshold for pump-motor transition — threshold angular velocity for transient mode
rpm | deg/s | rad/s

Details

The angular velocity threshold for the transition between pump and hydraulic motor operation. The transition region is defined around 0 rpm between the positive and negative values of the angular velocity threshold. Within this region, the calculated leakage rate and friction torque are corrected according to the transition term , to ensure a smooth transition from one mode to the other.

Dependencies

To use this parameter, set Leakage and friction parameterization to one of the values:

  • `Tabulated data - volumetric and mechanical efficiencies';

  • `Input signal - volumetric and mechanical efficiencies';

  • Input signal - volumetric and mechanical losses.

Units

rpm | deg/s | rad/s
Default value

100.0 rpm
Program usage name

w_threshold
Evaluatable

Yes

# Cross-sectional area at ports A and B — cross-sectional area of ports A and B
m^2 | cm^2 | ft^2 | in^2 | km^2 | mi^2 | mm^2 | um^2 | yd^2

Details

Cross-sectional area of ports A and B. It is assumed that the areas are equal.

Units

m^2 | cm^2 | ft^2 | in^2 | km^2 | mi^2 | mm^2 | um^2 | yd^2
Default value

0.01 m^2
Program usage name

port_area
Evaluatable

Yes

# Check if operating beyond the range of supplied tabulated data — reporting of data overruns
None | Error

Details

Select Error to stop the simulation when the block uses values outside the provided data range.

If the Leakage and friction parameterization parameter is set to Tabulated data - torque and speed, this parameter also checks if the block is running in the NaN value range.

Dependencies

To use this parameter, set the Leakage and friction parameterization to one of the values:

  • Tabulated data - volumetric and mechanical efficiencies;

  • `Tabulated data - volumetric and mechanical losses'.

Values

None | Error
Default value

None
Program usage name

supplied_range_assert_action
Evaluatable

No

# Check if operating beyond pump mode — message about unit operation outside pump mode
None | Error

Details

Select Error to stop the simulation when the unit is operating in forward or reverse hydraulic motor modes.

Dependencies

To use this parameter, set the Leakage and friction parameterization parameters to `Input signal - volumetric and mechanical losses'.

Values

None | Error
Default value

None
Program usage name

operating_mode_assert_action
Evaluatable

No