Buildings.UsersGuide.ReleaseNotes

Release notes

This section summarizes the changes that have been performed on the Buildings library

• Version 0.3.0 (September 30, 2008)
• Version 0.2.0 (June 17, 2008)
• Version 0.1.0 (May 27, 2008)

Package Content

Name	Description
Version_0_3_0	Version 0.3.0
Version_0_2_0	Version 0.2.0
Version_0_1_0	Version 0.1.0

Buildings.UsersGuide.ReleaseNotes.Version_0_3_0

Version 0.3.0

• The package Buildings.Fluids.Sources has been added. The package contains models for modeling species that do not affect the medium balance of volumes. This can be used to track for example carbon dioxide or other species that have a small concentration.
• The package Buildings.Fluids.Actuators.Motors has been added. The package contains a motor model for valves and dampers.
• The package Buildings.Media has been reorganized and the new medium model Buildings.Media.GasesPTDecoupled.MoistAir has been added.
  In addition, this package now contains a bug fix that is needed for Modelica 2.2.1 and 2.2.2. The bugs are fixed by using a new base class Buildings.Media.Interfaces.PartialSimpleIdealGasMedium (that fixes the bugs) instead of Modelica.Media.Interfaces.PartialSimpleIdealGasMedium. In the original implementation, initial states of fluid volumes can be far away from the steady-state value because of an inconsistent implementation of the the enthalpy and internal energy. When the Buildings library is upgraded to to Modelica 3.0.0, it should be safe to remove this bug fix.
• The package Buildings.HeatExchangers has been revised and several models have been renamed. The heat exchanger models have been revised to allow computing the fluid volumes either dynamically, or in steady-state.
• The damper with exponential opening characteristic has been revised to allow control signals over the whole range between 0 and 1. This was in earlier versions restricted. In the same model, a bug was fixed that caused the flow to be largest for y=0, i.e., when the damper is closed.
• Additional models for psychrometric equations have been added. The new models contain equations that convert dew point temperature and water vapor pressure, as well as water vapor concentration and water vapor pressure.
• A new mixing volume has been added that allows latent heat exchange with the volume. This model can be used to model a volume of moist air with water vapor condensation inside the volume. The condensate is removed from the volume in its liquid phase.

Buildings.UsersGuide.ReleaseNotes.Version_0_2_0

Version 0.2.0

New in this version are models for two and three way valves. In addition, the Fluids package has been slightly revised. The package Fluids.BaseClasses has been added because in the previous version, partial models for fixed resistances where part of the Actuator package.

Buildings.UsersGuide.ReleaseNotes.Version_0_1_0

Version 0.1.0

First release of the library.

This version contains basic models for modeling building HVAC systems. It also contains new medium models in the package Buildings.Media. These medium models have simpler property functions than the ones from Modelica.Media. For example, there is medium model with constant heat capacity which is often sufficiently accurate for building HVAC simulation, in contrast to the more detailed models from Modelica.Media that are valid in a larger temperature range, at the expense of introducing non-linearities due to the medium properties.