Reservoir (MA)
Boundary conditions for moist air network at constant pressure, temperature, moisture, and trace gas levels
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Simscape / Foundation Library / Moist Air / Elements
Description
The Reservoir (MA) block sets boundary conditions in a moist air network. The volume of moist air inside the reservoir is assumed infinite. Therefore, the flow is assumed quasi-steady. Moist air leaves the reservoir at the reservoir pressure, temperature, specific humidity, and trace gas mass fraction. Moist air enters the reservoir at the reservoir pressure, but the temperature, specific humidity, and trace gas mass fraction are determined by the moist air network upstream.
You specify the reservoir pressure, temperature, amount of moisture, and amount of
trace gas by entering block parameter values. Block parameters related to trace gas are
ignored if Trace gas model in the Moist Air
Properties (MA) block is set to None
.
You can specify moisture as one of:
Relative humidity, φw
Specific humidity, xw
Water vapor mole fraction, yw
Humidity ratio, rw
You can specify trace gas as one of:
Trace gas mass fraction, xg
Trace gas mole fraction, yg
These moisture and trace gas quantities are related to each other as follows:
where:
p is pressure.
R is specific gas constant.
Subscripts a
, w
, and g
indicate the properties of dry air, water vapor, and trace gas, respectively. Subscript
ws
indicates water vapor at saturation.
Ports
Conserving
Parameters
Extended Capabilities
Version History
Introduced in R2018a