Fan (G)

Fan in the gas mains.

blockType: EngeeFluids.Gas.Turbomachinery.Fan

Path in the library:

/Physical Modeling/Fluids/Gas/Turbomachinery/Fan (G)

Description

Unit Fan (G) represents a fan in a gas network. You can model the torque and pressure gain on the fan as a function of static pressure and flow rate or by usage of tabular data (1D or 2D) for reference pressure, shaft speed and flow rate.

By default, flow and pressure gains are routed from port A to port B. Port C represents the fan housing and port R represents the fan shaft. You can specify the normal direction of shaft rotation in the Mechanical orientation parameters. If the shaft starts to rotate in the opposite direction, the pressure drop across the fan will drop to zero.

Parameterization by nominal pressure, flow rate and shaft speed

If the Fan parameterization is set to `Static pressure and flow rate at reference shaft speed', the block uses the analytical fan similarity laws and reference differential pressure to calculate the pressure rise from port A to port B:

where

- is the reference pressure drop. The block uses a quadratic approximation of the fan pressure drop values for the parameters Maximum static pressure gain at zero flow, Nominal static pressure gain and Maximum volumetric flow rate at zero pressure;
- shaft angular speed, - ;
- reference shaft angular velocity, Reference shaft speed parameters;
- geometric scale factor, parameters Fan diameter scale factor.

The shaft torque is calculated in the unit based on the reference mechanical power and fan similarity laws:

where is the ratio of pressure gain to fan efficiency:

If the Shaft power specification parameters are set to Fan efficiency, the block uses a quadratic efficiency approximation between the peak fan efficiency and 0. The value of is the value of the Nominal efficiency parameter, which the block interprets as the peak efficiency. If the Shaft power specification parameters are set to Brake power, the nominal efficiency of the fan is determined from the nominal effective power under peak or nominal conditions:

It is assumed that the efficiency is zero when there is no flow rate or when the flow rate reaches the maximum volumetric flow rate when there is no pressure rise. The unit uses the current flow rate to calculate the reference flow rate:

Parameterization of one-dimensional tabular data: pressure as a function of flow rate at reference shaft speed

If the Fan parameterization parameter is set to `1D tabulated data - static pressure vs. flow rate at reference shaft speed', the fan operation is modelled as a function of volumetric flow rate. The block interpolates the pressure gain from port A to port B from the 1D parameters Static pressure gain vector:

where

- gas density;
- reference density, the value of the Reference density parameters.

The shaft torque is calculated from the reference mechanical power and the fan similarity laws:

In the instantaneous flow rate block, is used to calculate the reference flow rate:

If during the simulation the instantaneous values of parameters (variables) are outside the tabulated data, the block extrapolates the pressure based on the average slope of the fan curves and the reference torque to the nearest point.

Parameterization of two-dimensional tabular data: pressure as a function of shaft speed and flow rate

If the Fan parameterization parameter is set to 2D tabulated data - static pressure vs. shaft speed and flow rate, the pressure gain generated by the fan is modelled as a 2D function of volumetric flow and angular velocity. The block interpolates the pressure gain from port A to port B based on the two-dimensional parameter Static pressure gain table, dp(w,q):

The block calculates the shaft torque based on the reference mechanical power and fan similarity laws:

where the reference mechanical power is a function of the reference flow rate and the instantaneous shaft speed.

The instantaneous flow rate is used to calculate the reference flow rate:

If during the simulation the parameters (variables) values are outside the tabulated data, the unit extrapolates the pressure gain based on the average slope of the fan and reference torque curves to the nearest point.

*Missing data

If there are unknown elements in the table, use NaN instead of these values. The unit fills in the NaN elements by extrapolation based on the average slope of the fan curves. Artificial numerical values should not be used as they distort the behaviour of the fan when operating in a given range. If there are unknown elements in your tabular data:

NaN elements in the table must be contiguous.
The positions of the NaN elements in the parameters Static pressure gain table, dp(w,q), Efficiency table, eta(w,q) and Mechanical power table, W(w,q) must be adjacent to each other.
The `NaN' elements should be located in the upper right-hand side of the table, corresponding to the highest volumetric flow rate and lowest shaft speed.

Parameterization of two-dimensional tabular data: flow rate as a function of shaft speed and pressure

If the Fan parameterization parameter is set to 2D tabulated data - flow rate vs. shaft speed and static pressure, the flow rate generated by the fan is modelled as a two-dimensional function of pressure and angular velocity. The block interpolates the flow rate based on the two-dimensional parameter Volumetric flow rate table, q(w,dp). The reference flow rate is defined as a function of the reference pressure increment and the current shaft angular velocity :

where the reference pressure rise is derived from the pressure drop across the fan:

The shaft torque is determined from the reference mechanical power and the fan similarity laws:

where the reference mechanical power is a function of the reference flow rate and the current shaft speed.

If during the simulation the parameters (variables) values go beyond the tabulated values the unit extrapolates the pressure based on the average slope of the fan and reference torque curves to the nearest point.

*Missing data

NaN elements in the table must be contiguous.
The positions of the NaN elements in the parameters Volumetric flow rate table, q(w,dp), Efficiency table, eta(w,dp) and Mechanical power table, W(w,q) must be contiguous with each other.
The `NaN' elements should be located in the upper right-hand side of the table, corresponding to the highest volumetric flow rate and the lowest shaft speed.

Power and efficiency

You can specify the method of calculating the shaft power based on fan efficiency or effective power.

In the block, efficiency is defined as:

where is the effective power , or the mechanical power measured at the shaft:

In a block, the fluid power is defined as:

Torque is defined as follows:

Assumptions and limitations

If the shaft rotates in the opposite direction from the direction specified in the Mechanical orientation parameters, the pressure gain through the block will drop to zero and the results may not be accurate.
The block assumes that the fan is operating quasi-stationary.
The block models fan operation in the approximation of increasing static pressure, not total fan pressure.

Ports

Conserving

# A — gas inlet port
gas

Details

Gas non-directional port associated with the fan inlet section.

Program usage name

inlet

# B — gas outlet port
gas

Details

Gas non-directional port associated with the fan outlet section.

Program usage name

outlet

# R — fan shaft
`rotational mechanics

Details

A mechanical non-directional port associated with a fan shaft.

Program usage name

rod_flange

# C — fan housing
`rotational mechanics

Details

A mechanical non-directional port associated with the fan housing.

Program usage name

case_flange

Parameters

Main

# Fan parameterization — a model for calculating fan characteristics
Static pressure and flow rate at reference shaft speed | 1D tabulated data - static pressure vs. flow rate at reference shaft speed | 2D tabulated data - static pressure vs. shaft speed and flow rate | 2D tabulated data - flow rate vs. shaft speed and static pressure

Details

Parameterization of fan characteristics:

Static pressure and flow rate at reference shaft speed — the characteristics of the fan are calculated based on the set values of the typical, nominal or permissible pressure increase and volume flow.
1D tabulated data – static pressure vs flow rate at reference shaft speed — the fan characteristics are calculated based on the interpolation of pressure increase data depending on the volume flow.
2D tabulated data – static pressure vs shaft speed and flow rate — the fan characteristics are calculated based on the interpolation of pressure gain data depending on the shaft rotation speed and volume flow.
2D tabulated data – flow rate vs shaft speed and static pressure — the fan characteristics are calculated based on the interpolation of volumetric flow data depending on the shaft rotation speed and pressure increase.

Values	`Static pressure and flow rate at reference shaft speed` \| `1D tabulated data - static pressure vs. flow rate at reference shaft speed` \| `2D tabulated data - static pressure vs. shaft speed and flow rate` \| `2D tabulated data - flow rate vs. shaft speed and static pressure`
Default value	`Static pressure and flow rate at reference shaft speed`
Program usage name	`parameterization`
Evaluatable	No

# Shaft power specification — the method of determining the power
Fan efficiency | Brake power

Details

A method for determining fan power:

Fan efficiency — Mechanical power is calculated from the efficiency of the fan.
Brake power — mechanical power is set directly.

Values	`Fan efficiency` \| `Brake power`
Default value	`Fan efficiency`
Program usage name	`mechanical_power_type`
Evaluatable	No

# Nominal volumetric flow rate — flow rate at the reference shaft rotation speed
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

Volumetric flow rate through the fan at a reference shaft rotation speed under nominal, standard, or design operating conditions.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`0.12 m^3/s`
Program usage name	`Vdot_nominal`
Evaluatable	Yes

# Nominal static pressure gain — pressure increase at the reference shaft rotation speed
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

Pressure increase from port A to port B at the reference shaft rotation speed under nominal, standard or design operating conditions.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`5400.0 Pa`
Program usage name	`delta_p_nominal`
Evaluatable	Yes

# Nominal efficiency — efficiency at the reference shaft rotation speed

Details

The nominal efficiency of converting shaft power into hydraulic power at a reference shaft rotation speed under nominal, standard or design operating conditions.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed, and for the Shaft power specification parameter , the value Fan efficiency.

Default value	`0.4`
Program usage name	`efficiency_nominal`
Evaluatable	Yes

# Nominal mechanical power — power at rated efficiency
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

Mechanical power that drives the gas flow at a reference shaft rotation speed under nominal, standard, or design operating conditions.

Dependencies

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`1620.0 W`
Program usage name	`mechanical_power_nominal`
Evaluatable	Yes

# Maximum static pressure gain at zero flow — maximum pressure at the reference shaft rotation speed
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

Pressure increase from port A to port B at the reference shaft rotation speed when there is no flow through the fan.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`6400.0 Pa`
Program usage name	`delta_p_max_at_zero_Vdot_nominal`
Evaluatable	Yes

# Maximum volumetric flow rate at zero pressure — maximum flow rate at the reference shaft rotation speed
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

Volumetric flow rate at a given shaft rotation speed and constant pressure.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`0.24 m^3/s`
Program usage name	`Vdot_max_at_zero_delta_p_nominal`
Evaluatable	Yes

Details

The reference angular velocity of the shaft corresponding to the fan characteristic curve data.

Dependencies

To use this parameter, set the Fan parameterization parameter to Static pressure and flow rate at reference shaft speed or 1D tabulated data - static pressure vs. flow rate at reference shaft speed.

Units	`rad/s` \| `deg/s` \| `rad/min` \| `deg/min` \| `rpm` \| `rps`
Default value	`3000.0 rpm`
Program usage names	`w_ref_nominal`, `w_ref_1D`
Evaluatable	Yes

# Volumetric flow rate vector — the vector of flow values corresponding to the fan curve
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

Vector of volume flow values for one-dimensional interpolation of the characteristic curve of the fan. If the Shaft power specification parameter has the value Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Dependencies

To use this parameter, set the Fan parameterization parameter to 1D tabulated data - static pressure vs. flow rate at reference shaft speed.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`[0.0278, 0.0556, 0.0833, 0.111, 0.139, 0.167] m^3/s`
Program usage name	`Vdot_vector_1D`
Evaluatable	Yes

# Static pressure gain vector — pressure gain vector for a given volume flow rate
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

The vector of pressure increase values. Each element of this vector must correspond to an element of the Volumetric flow rate vector vector. A pressure gain is an increase in pressure from port A to port B at a reference shaft rotation speed. If the Shaft power specification parameter has the value Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Dependencies

To use this parameter, set the Fan parameterization parameter to 1D tabulated data - static pressure vs. flow rate at reference shaft speed.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`[6410.0, 6375.0, 6018.0, 5366.0, 4501.0, 3609.0] Pa`
Program usage name	`delta_p_vector_1D`
Evaluatable	Yes

# Efficiency vector — efficiency vector for a given volume flow rate

Details

The vector of fan efficiency values. Each element of this vector must correspond to an element of the Volumetric flow rate vector vector. Efficiency is the ratio of hydraulic power to mechanical shaft power at a reference shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 1D tabulated data - static pressure vs. flow rate at reference shaft speed, and for the Shaft power specification parameter , the value Fan efficiency.

Default value	`[0.257, 0.394, 0.453, 0.470, 0.459, 0.415]`
Program usage name	`efficiency_vector_1D`
Evaluatable	Yes

# Mechanical power vector — The vector of mechanical power for a given flow rate is used to calculate the torque on the shaft
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The vector of values of the mechanical power of the shaft. Each element of this vector must correspond to an element of the Volumetric flow rate vector vector. Mechanical power is the power that drives the fan at a reference shaft rotation speed. These values may be negative if the fan data is outside the normal operating range.

Dependencies

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`[693.0, 900.0, 1107.0, 1267.0, 1363.0, 1452.0] W`
Program usage name	`mechanical_power_vector_1D`
Evaluatable	Yes

# Reference density — the gas density at which the reference operating mode of the fan was measured
kg/m^3 | g/m^3 | g/cm^3 | g/mm^3 | lbm/ft^3 | lbm/gal | lbm/in^3

Details

The gas density corresponding to the fan characteristic curve data.

Dependencies

To use this parameter, set the Fan parameterization parameter to 1D tabulated data - static pressure vs. flow rate at reference shaft speed, 2D tabulated data - static pressure vs. shaft speed and flow rate or 2D tabulated data - flow rate vs. shaft speed and static pressure.

Units	`kg/m^3` \| `g/m^3` \| `g/cm^3` \| `g/mm^3` \| `lbm/ft^3` \| `lbm/gal` \| `lbm/in^3`
Default value	`1.2 kg/m^3`
Program usage names	`rho_ref_1D`, `rho_ref_2D_delta_p`, `rho_ref_2D_Vdot`
Evaluatable	Yes

# Minimum shaft speed threshold as fraction of reference — threshold for minimum shaft rotation speed

Details

The threshold for the minimum shaft rotation speed in fractions of the reference shaft rotation speed. The unit uses this value to ensure that the shaft rotation speed does not become equal. 0 and it did not cause a division by zero error in the expression for .

Dependencies

Default value	`0.01`
Program usage name	`w_threshold_factor`
Evaluatable	Yes

Details

A vector of shaft angular velocity values for two-dimensional interpolation of fan characteristic curves.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - static pressure vs. shaft speed and flow rate or 2D tabulated data - flow rate vs. shaft speed and static pressure.

Units	`rad/s` \| `deg/s` \| `rad/min` \| `deg/min` \| `rpm` \| `rps`
Default value	`[2400.0, 3000.0, 3600.0] rpm`
Program usage names	`w_vector_2D_delta_p`, `w_vector_2D_Vdot`
Evaluatable	Yes

# Volumetric flow rate vector, q — volume flow vector (for 2D tabulated data - static pressure vs. shaft_speed and flow rate)
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

Vector of volume flow values for two-dimensional interpolation of fan characteristic curves. If the Shaft power specification parameter is set to Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - static pressure vs. shaft speed and flow rate.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`[0.0278, 0.0556, 0.0833, 0.111, 0.139, 0.167] m^3/s`
Program usage name	`Vdot_vector_2D_delta_p`
Evaluatable	Yes

# Static pressure gain table, dp(w,q) — pressure increment for pressure parameterization
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

The matrix on pressure increase values for two-dimensional interpolation of pressure increase. A pressure gain is an increase in pressure from port A to port B. If the Shaft power specification parameter is set to Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w. The elements corresponding to zero consumption must be arranged in strictly ascending order.
— the number of elements in the parameter Volumetric flow rate vector, q.

If there are unknown elements in the table, use NaN instead of these values. The block fills in the elements NaN by extrapolating based on the average slope of the fan curves. Do not use artificial numerical values, as they distort the behavior of the fan when operating in this range. When using unknown elements:

Elements NaN the tables must be adjacent.
Item positions NaN The parameters Static pressure gain table, dp(w,q), Efficiency table, eta(w,q) and Mechanical power table, W(w,q) must match each other.
Elements NaN They should be located in the upper right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - static pressure vs. shaft speed and flow rate.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`[4111.0 4010.0 3551.0 2881.0 2167.0 1453.0; 6410.0 6375.0 6018.0 5366.0 4501.0 3609.0; 9217.0 9285.0 9022.0 8428.0 7552.0 6482.0] Pa`
Program usage name	`delta_p_matrix_2D_delta_p`
Evaluatable	Yes

# Efficiency table, eta(w,q) — efficiency for torque parameterization

Details

The matrix on efficiency values for 2D torque interpolation. Efficiency is the ratio of hydraulic power to mechanical shaft power at a reference shaft rotation speed.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w.
— the number of elements in the parameter Volumetric flow rate vector, q.

Elements NaN the tables must be adjacent.
Item positions NaN The parameters Static pressure gain table, dp(w,q), Efficiency table, eta(w,q) and Mechanical power table, W(w,q) must match each other.
Elements NaN They should be located in the upper right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - static pressure vs. shaft speed and flow rate and Shaft power specification value Fan efficiency.

Default value	`[0.300 0.434 0.468 0.459 0.400 0.300; 0.257 0.394 0.453 0.470 0.459 0.415; 0.225 0.359 0.434 0.461 0.470 0.459]`
Program usage name	`efficiency_matrix_2D_delta_p`
Evaluatable	Yes

# Mechanical power table, W(w,q) — mechanical power for torque parameterization
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The matrix on mechanical power values for 2D torque interpolation. These values may be negative if the fan data is outside the normal operating range. Mechanical power is the power that drives the fan.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w. The elements corresponding to zero consumption must be arranged in strictly ascending order.
— the number of elements in the parameter Volumetric flow rate vector, q.

Elements NaN the tables must be adjacent.
Item positions NaN The parameters Static pressure gain table, dp(w,q), Efficiency table, eta(w,q) and Mechanical power table, W(w,q) must match each other.
Elements NaN They should be located in the upper-right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - static pressure vs. shaft speed and flow rate and Shaft power specification value Brake power.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`[381.0 514.0 632.0 697.0 753.0 809.0; 693.0 900.0 1107.0 1267.0 1363.0 1452.0; 1139.0 1438.0 1732.0 2029.0 2233.0 2358.0] W`
Program usage name	`mechanical_power_matrix_2D_delta_p`
Evaluatable	Yes

# Static pressure gain vector, dp — vector of pressure gain values (for 2D tabulated data - flow rate vs. shaft_speed and static pressure)
Pa | uPa | hPa | kPa | MPa | GPa | kgf/m^2 | kgf/cm^2 | kgf/mm^2 | mbar | bar | kbar | atm | ksi | psi | mmHg | inHg

Details

A vector of pressure gain values for two-dimensional interpolation of characteristic fan curves. If the Shaft power specification parameter is set to Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - flow rate vs. shaft speed and static pressure.

Units	`Pa` \| `uPa` \| `hPa` \| `kPa` \| `MPa` \| `GPa` \| `kgf/m^2` \| `kgf/cm^2` \| `kgf/mm^2` \| `mbar` \| `bar` \| `kbar` \| `atm` \| `ksi` \| `psi` \| `mmHg` \| `inHg`
Default value	`[31.0, 62.0, 93.0, 124.0] Pa`
Program usage name	`delta_p_vector_2D_Vdot`
Evaluatable	Yes

# Volumetric flow rate table, q(w,dp) — volumetric flow rate corresponding to the vectors of rotation speed and pressure increase
m^3/s | mm^3/s | cm^3/s | m^3/hr | m^3/min | l/hr | l/min | l/s | gal/hr | gal/min | gal/s | ft^3/hr | ft^3/min | ft^3/s

Details

The matrix on volume flow values for two-dimensional volume flow interpolation. If the Shaft power specification parameter is set to Brake power, then the fan data may exceed the normal operating range, and these values may be negative.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w. The elements corresponding to zero consumption must be arranged in strictly ascending order.
— the number of elements in the parameter Static pressure gain vector, Dp.

Elements NaN the tables must be adjacent.
Item positions NaN in the parameters Volumetric flow rate table, q(w,dp), Efficiency table, eta(w,dp) and Mechanical power table, W(w,dp) must match each other.
Elements NaN They should be located in the upper-right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - flow rate vs. shaft speed and static pressure.

Units	`m^3/s` \| `mm^3/s` \| `cm^3/s` \| `m^3/hr` \| `m^3/min` \| `l/hr` \| `l/min` \| `l/s` \| `gal/hr` \| `gal/min` \| `gal/s` \| `ft^3/hr` \| `ft^3/min` \| `ft^3/s`
Default value	`[0.802 0.759 0.703 0.611; 0.936 0.902 0.862 0.810; 1.056 1.027 0.994 0.956] m^3/s`
Program usage name	`Vdot_matrix_2D_Vdot`
Evaluatable	Yes

# Efficiency table, eta(w,dp) — efficiency for torque parameterization

Details

The matrix on efficiency values for two-dimensional torque interpolation. Efficiency is the ratio of hydraulic power to mechanical shaft power at a reference shaft rotation speed.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w.
— the number of elements in the parameter Static pressure gain vector, Dp.

Elements NaN the tables must be adjacent.
Item positions NaN in the parameters Volumetric flow rate table, q(w,dp), Efficiency table, eta(w,dp) and Mechanical power table, W(w,dp) must match each other.
Elements NaN They should be located in the upper-right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - flow rate vs. shaft speed and static pressure and Shaft power specification value Fan efficiency.

Default value	`[0.088 0.162 0.220 0.261; 0.068 0.128 0.180 0.222; 0.055 0.105 0.148 0.188]`
Program usage name	`efficiency_matrix_2D_Vdot`
Evaluatable	Yes

# Mechanical power table, W(w,dp) — mechanical power for torque parameterization
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The matrix on mechanical power values for two-dimensional torque interpolation. These values may be negative if the fan data is outside the normal operating range. Mechanical power is the power that drives the fan.

Values and — these are the sizes of the corresponding vectors:

— the number of elements in the Shaft speed vector parameter, w. The elements corresponding to zero consumption must be arranged in strictly ascending order.
— the number of elements in the parameter Static pressure gain vector, Dp.

Elements NaN the tables must be adjacent.
Item positions NaN in the parameters Volumetric flow rate table, q(w,dp), Efficiency table, eta(w,dp) and Mechanical power table, W(w,dp) must match each other.
Elements NaN They should be located in the upper-right part of the table, which corresponds to the highest volume flow and the lowest shaft rotation speed.

Dependencies

To use this parameter, set the Fan parameterization parameter to 2D tabulated data - flow rate vs. shaft speed and static pressure and Shaft power specification value Brake power.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`[283.0, 290.0, 297.0, 290.0; 427.0, 437.0, 445.0, 452.0; 595.0, 606.0, 625.0, 631.0] W`
Program usage name	`mechanical_power_matrix_2D_Vdot`
Evaluatable	Yes

# Fan diameter scale factor — geometric scale factor

Details

A geometric scale factor for increasing or decreasing the size of the simulated fan compared to a given fan parameterization. Scaling may be inaccurate for scale factors that have a value much larger or much smaller. 1.

Default value	`1.0`
Program usage name	`diameter_scale_factor`
Evaluatable	Yes

# Mechanical orientation — direction of rotation
Positive angular velocity of port R relative to port C corresponds to normal fan operation | Negative angular velocity of port R relative to port C corresponds to normal fan operation

Details

The normal operation of the fan is in the positive (or negative) direction of rotation of the shaft. By default, the normal operation mode corresponds to the positive direction of rotation.

Values	`Positive angular velocity of port R relative to port C corresponds to normal fan operation` \| `Negative angular velocity of port R relative to port C corresponds to normal fan operation`
Default value	`Positive angular velocity of port R relative to port C corresponds to normal fan operation`
Program usage name	`orientation`
Evaluatable	No

# Inlet flow area (port A) — port area A
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The cross-sectional area of the duct at the fan inlet.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`0.01 m^2`
Program usage name	`inlet_area`
Evaluatable	Yes

# Outlet flow area (port B) — port area B
m^2 | um^2 | mm^2 | cm^2 | km^2 | in^2 | ft^2 | yd^2 | mi^2 | ha | ac

Details

The cross-sectional area of the duct at the fan outlet.

Units	`m^2` \| `um^2` \| `mm^2` \| `cm^2` \| `km^2` \| `in^2` \| `ft^2` \| `yd^2` \| `mi^2` \| `ha` \| `ac`
Default value	`0.01 m^2`
Program usage name	`outlet_area`
Evaluatable	Yes