User manual

Dymola 2015 Release Notes 37
• Flat tube type air – gas components have been added.
• Flat tube type air – two phase components have been added.
• A new type of fin geometry has been added.
• It is now possible to discretize the flat type internal flow orthogonal to the flow
direction.
• Heat exchanger test benches are now included.
In order to support all different heat exchanger types using common base classes, there have
been some changes to the internal structure of the model with this release. Some examples:
• A common template PartialFlatTubeHX for all flat tube type heat exchangers has been
created.
• A separate template for each of air – gas, air – liquid, and air – two phases has been
created.
• The geometry records have been structured in a hierarchical way.
The included conversion script supports automatic conversion of user models from versions
1.0 and 1.0.1.
3.9.8 Hydraulics Library
The version 4.0 is a major release, with a number of enhancements and improvements; the
following are some examples.
With “Thermo Hydraulics” it is now possible to enable thermo dynamic equations, as well
as to disregard the temperature effects. The models of the working fluids are based on
polynomials and accurately model fluid properties dependent on temperature and pressure.
A large variety of pre-defined thermo-dynamically sound oil models are included. A
descriptive guide/tutorial is added on how to get started with Thermo Hydraulics.
New fluid property models of jet fuels have been added, as have new mass flow rate- and
temperature sensors.
In the Elements package, a number of modifications to the spool valve component have
been made.
The library is significantly improved in terms of ease of use, quality and graphical
appearance, some examples are:
• Pressure dependent color on cylinders and chamber, for animation purposes.
• More consistent use of the circle on ports (for visualizing where pressure might be a
state).
• Restructured Fluids package; the oils are now easier to find.
• The previous pumps package is now divided into three subpackages: Pumps, Motors,
and Sources.
• The friction model in Cylinders is now replaceable.
• OilVolume, MultiPortOilVolume, and Chamber now extend from the same template
(VolumeDynamics), where all common parameters and equations are located.