Controlled Trace Gas Source (MA)
Addition or removal of impurity gases.
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Description
The Trace Gas Source (MA) unit is a permanent source or absorber of impurity gas for a connected wet air network.
A positive or negative mass flow rate of impurity gas causes the impurity gas level to increase or decrease.
The energy associated with the addition or removal of the impurity gas is equal to
,
where:
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- is the impurity gas mass flow rate given by the parameter Trace gas mass flow rate.
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- is the specific enthalpy of the admixture gas.
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- is the temperature of the added impurity gas, given by the input scalar signal at the T port. The unit uses this value to estimate the specific enthalpy of the added impurity gas only. The specific enthalpy of the removed impurity gas is determined from the temperature of the connected humid air network.
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- is the temperature at port S, which is equal to the temperature of the connected humid air network.
Port S is the humid air source port. Connect this port to the S port of the humid air final volume unit to add or remove impurity gas using the Trace Gas Source (MA) unit.
Parameters
Rate of added trace gas - constant mass flow rate through the source
0 (By default)
Mass flow rate of added trace gas through the source.
A positive value adds impurity gas to the connected humid air network. A negative value removes impurity gas from this network.
Added trace gas temperature specification - method of setting the trace gas temperature specification
Atmospheric temperature (By default) | Specified temperature.
Selects the impurity gas temperature specification method:
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`Atmospheric temperature' - the atmospheric temperature set by the Moist Air Properties (MA) unit connected to the circuit is used.
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`Specified temperature' - the value is set using the Temperature of added trace gas parameter.
Temperature of added trace gas - temperature of added trace gas
`293.15 K (by default).
Temperature of added trace gas. This temperature remains constant during the simulation. The unit only uses this value to estimate the specific enthalpy of the added impurity gas. The specific enthalpy of the removed impurity gas is determined based on the temperature of the connected humid air network.
Dependencies
Used when the Added trace gas temperature specification is set to Specified temperature.