The Moist Air Version of the Heat and Moisture Transport Multiphysics Interface
When the Moist Air version of the predefined Heat and Moisture Transport () interface is added (found under the Heat Transfer branch () of the Model Wizard or Add Physics windows), it combines the Heat Transfer in Moist Air and the Moisture Transport in Air interfaces to model coupled heat and moisture transport in moist air, by modeling moisture transport by vapor diffusion and convection, and heat transfer by conduction and convection with moisture-dependent thermodynamics properties.
Stationary, time-domain, and frequency-domain modeling are supported in all space dimensions.
On the Constituent Physics Interfaces
As a predefined multiphysics coupling, Heat Transfer in Moist Air and Moisture Transport in Air interfaces are added to the Model Builder. In addition, a Multiphysics node is added, which automatically includes the Heat and Moisture multiphysics coupling feature.
The Heat Transfer in Moist Air interface provides features for modeling heat transfer by conduction, convection, and radiation. The Moist Air model, active by default in all domains, provides in addition the functionality for moisture content dependency of thermodynamics properties.
The Moisture Transport in Air interface provides features for modeling moisture transfer by vapor convection and diffusion. A Moist Air model is active by default on all domains.
As an add-on Multiphysics Coupling
The Heat and Moisture multiphysics coupling is also available when there is at least one of each of the following interfaces with the specified model activated:
•
Any version of the Heat Transfer interface, with Fluid or Moist Air model
•
Any version of the Moisture Transport interface, with Moist Air model
Settings for the Physics Interfaces and Coupling Features
When physics interfaces are added using the predefined couplings, specific settings are included with the physics interfaces and the coupling feature.
Table 8-8: Modified Settings for the Moist Air Version of the Heat and Moisture Transport interface
Physics or Coupling Interface
Modified Settings (if Any)
Heat Transfer in Moist Air
In the Thermodynamics, Fluid section of the Moist Air default feature, the Input quantity is set to Relative humidity, and the Relative humidity, , the Relative humidity, temperature condition, , and the Relative humidity, absolute pressure condition, , are automatically set to the variables from the Heat and Moisture multiphysics coupling feature.
The latent heat sources are automatically handled on boundaries where Wet Surface or Moist Surface features are applied.
Moisture Transport in Air
In the Model Input section of the Moist Air default feature, the Temperature, T, is automatically set to the variable from the Heat and Moisture multiphysics coupling feature.
Heat and Moisture
The Heat Transfer and Moisture Transport interfaces are preselected
Note that these settings may be overridden if another predefined coupling is added.