I have set up 2 identical models in Simulink/Simscape Moist Air and Gas in R2022a.
For Moist Air: Controlled Reservoir to Local Restriction to Controlled Reservoir.
For Gas: Reservoir to Local Restriction to Reservoir.
I set the upstream conditions to 14.7 psi, 70 F for both. For Moist Air, i set Trace Gas and Humidity to 0. Down stream is set to 14.65488601 psi and 70F. The area of each Local Restriction is set to 7 in^2. The Cd is set to 1. Min / Max constrictioins are set to 1e-10 and 20 in^2 respectively. The Cross-sectional area at ports A and B is set to 21 in^2. The Upstream / Downstream Resevoir Cross-sectional areas are port A are set to 100 in^2.
I am using PS-Simulink Converters to get lbm/min as the unit from each downstream mass flow sensor.
I am using PS-Simulink Converters to go from a text box with 7 to in^2 to go into the AR port of the local restrictions for both models.
For Moist Air, i get 52.5 lbm/min, for Gas i get 15.04 lbm/min. I have an Excel based hand calc for orifices using basic isentropic relations and get 16.29 lbm/min, much closer to the Gas result.
What is going on with the Moist Air results? I am using the default perfect gas values in the Gas properties block and Air in the Moist Air block. The parameters don’t seeem too different, no where near enough to result in the differences seen below.I have set up 2 identical models in Simulink/Simscape Moist Air and Gas in R2022a.
For Moist Air: Controlled Reservoir to Local Restriction to Controlled Reservoir.
For Gas: Reservoir to Local Restriction to Reservoir.
I set the upstream conditions to 14.7 psi, 70 F for both. For Moist Air, i set Trace Gas and Humidity to 0. Down stream is set to 14.65488601 psi and 70F. The area of each Local Restriction is set to 7 in^2. The Cd is set to 1. Min / Max constrictioins are set to 1e-10 and 20 in^2 respectively. The Cross-sectional area at ports A and B is set to 21 in^2. The Upstream / Downstream Resevoir Cross-sectional areas are port A are set to 100 in^2.
I am using PS-Simulink Converters to get lbm/min as the unit from each downstream mass flow sensor.
I am using PS-Simulink Converters to go from a text box with 7 to in^2 to go into the AR port of the local restrictions for both models.
For Moist Air, i get 52.5 lbm/min, for Gas i get 15.04 lbm/min. I have an Excel based hand calc for orifices using basic isentropic relations and get 16.29 lbm/min, much closer to the Gas result.
What is going on with the Moist Air results? I am using the default perfect gas values in the Gas properties block and Air in the Moist Air block. The parameters don’t seeem too different, no where near enough to result in the differences seen below. I have set up 2 identical models in Simulink/Simscape Moist Air and Gas in R2022a.
For Moist Air: Controlled Reservoir to Local Restriction to Controlled Reservoir.
For Gas: Reservoir to Local Restriction to Reservoir.
I set the upstream conditions to 14.7 psi, 70 F for both. For Moist Air, i set Trace Gas and Humidity to 0. Down stream is set to 14.65488601 psi and 70F. The area of each Local Restriction is set to 7 in^2. The Cd is set to 1. Min / Max constrictioins are set to 1e-10 and 20 in^2 respectively. The Cross-sectional area at ports A and B is set to 21 in^2. The Upstream / Downstream Resevoir Cross-sectional areas are port A are set to 100 in^2.
I am using PS-Simulink Converters to get lbm/min as the unit from each downstream mass flow sensor.
I am using PS-Simulink Converters to go from a text box with 7 to in^2 to go into the AR port of the local restrictions for both models.
For Moist Air, i get 52.5 lbm/min, for Gas i get 15.04 lbm/min. I have an Excel based hand calc for orifices using basic isentropic relations and get 16.29 lbm/min, much closer to the Gas result.
What is going on with the Moist Air results? I am using the default perfect gas values in the Gas properties block and Air in the Moist Air block. The parameters don’t seeem too different, no where near enough to result in the differences seen below. simulink, moist air, gas, mass flow, local restriction, simscape MATLAB Answers — New Questions

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