Mass & Energy Flow Rate Sensor (MA)

Measure mass and energy flow rates in a moist air network

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• Simscape / Foundation Library / Moist Air / Sensors

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Description

The Mass & Energy Flow Rate Sensor (MA) block represents an ideal sensor that measures mass flow rate and energy flow rates in a moist air network. There is no change in pressure, temperature, specific humidity, or trace gas mass fraction across the sensor.

Because the flow rates are Through variables, the block must connect in series with the component being measured.

The relative orientation of ports A and B establishes the measurement sign. The sign is positive if flow occurs from port A to port B. Switching port connections reverses the measurement sign.

Four physical signal ports output the measurement data. Connect the ports to PS-Simulink Converter blocks to transform the output physical signals into Simulink^® signals, for example, for plotting or additional data processing.

Ports

Output

M — Mixture mass flow rate, kg/s

physical signal

Physical signal output port for the mixture mass flow rate measurement.

Phi — Mixture energy flow rate, W

physical signal

Physical signal output port for the mixture energy flow rate measurement.

Mw — Water vapor mass flow rate, kg/s

physical signal

Physical signal output port for the water vapor mass flow rate measurement.

Mg — Trace gas mass flow rate, kg/s

physical signal

Physical signal output port for the trace gas mass flow rate measurement.

Conserving

A — Sensor inlet

moist air

Moist air conserving port. Mass and energy flow rates are positive if air flows from port A to port B.

B — Sensor outlet

moist air

Moist air conserving port. Mass and energy flow rates are positive if air flows from port A to port B.

Model Examples

Aircraft Environmental Control System

Models an aircraft environmental control system (ECS) that regulates pressure, temperature, humidity, and ozone (O3) to maintain a comfortable and safe cabin environment. Cooling and dehumidification are provided by the air cycle machine (ACM), which operates as an inverse Brayton cycle to remove heat from pressurized hot engine bleed air. Some hot bleed air is mixed directly with the output of the ACM to adjust the temperature. Pressurization is maintained by the outflow valve in the cabin. This model simulates the ECS operating from a hot ground condition to a cold cruise condition and back to a cold ground condition.

Open Model

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2018a