Version 188.8.131.52. Build 2.1.7009.26342
- Due to the growing number of data that was being shown in the Heat Balance page (fields for inlet/outlet, shell/tubes, fluid data table, etc.), we have decided to simplify this page and to move the fluid information to two previous pages, exclusively dedicated to the selection of the Fluid in the tubes and in the shell.
The fluid's physical properties have been grouped in two
categories, depending if the property is related to the fluid in its
liquid state or in gas state.
Liquid Phase: Density, Specific Heat, Thermal Conductivity, Consistency Index, Flow Behaviour Index and Latent Heat.
Gas Phase: Gas Density, Specific Heat Gas at constant pressure (Cp), Thermal Conductivity Gas, Dynamic Viscosity Gas, Vapour Pressure and Vapour Fraction.
Depending on the type of process that needs to be
calculated (either Sensible heat or Condensation), the properties that
the fluid must be filled and defined are different:
Sensible Heat: There are two cases:
- Fluid in liquid phase: In this case it will be needed to have information about the Density, the Specific Heat, the Thermal Conductivity, Consistency Index and Flow Behaviour Index. All of them are available in the Liquid Phase tab of the fluid data table.
- Fluid in gas phase: In this case it will be necessary to have information about the Gas Density, Specific Heat at Constant Pressure (Cp), Gas Thermal Conductivity and Gas Dynamic Viscosity. Besides, the Vapour Fraction must be 1 through all desired temperatures (between the inlet and outlet temperatures), to indicate that the fluid is in gas phase during the whole process.
- Condensation: For this type of calculations, the fluid must be defined the following properties: Density (liquid), Specific Heat (liquid), Thermal Conductivity (liquid), Consistency Index, Flow Behaviour Index, Latent Heat, Density Gas, Dynamic Viscosity Gas and Vapour Pressure. Besides the Vapour Fraction must always be 0 and the Pressure at which the fluid is being defined must be NaN (that is internally considered by the application as a fluid defined in saturation). The fluid's field Condensable is activated automatically when all these criteria are met.
Liquid Phase Density Sp. Heat. Th. Cond. Cons. Idx. Flow B. Idx. Latent Heat Sensible Heat with Liquid X X X X X X Sensible Heat with Gas Condensation X X X X X X Gas Phase Density Sp. Heat Cp Th. Cond. Dyn. Visc. Vap. Press. Vapour % Sensible Heat with Liquid Sensible Heat with Gas X X X X 1 Condensation X X X 0
- Sensible Heat: There are two cases:
Fluid in Tubes (and Shell):
- These two new pages, previous to Heat Balance, must be used to edit/select the fluid that will be used in the subsequent calculations. The fluid's associated data table has been unfolded in two new tabs, one for the fluid's properties in Liquid Phase and another one for the Gas Phase.
- Vapour Fraction: It is one of the new properties for fluids. In the case of simple fluids (with a single compound) its value will be 0 when it is in liquid phase and 1 when in gas phase. More complex fluids (with several compounds) and that might show partial condensation will have values among 0 and 1. Even though at this moment the application cannot perform calculations with such fluids, this field lays the foundations to be able to do it in later versions.
- Pressure: Change in the units of pressure: instead of using bar (and psi), now the application shows bar-a (and psi-a).
- Fix in the calculation of geometries with several passes: When the number of passes to calculate is larger than the number of tubes, an IndexOutOfRangeException was thrown. This problem has been fixed and now a more describing error message is shown to the user.
- Fix in the graphical representation of tubeplates: Geometries, despite of sometimes being invalid, should always be drawn when possible. The reason for a geometry to be invalid might as simple as a minimal tolerance not met and despite that, its graphical representation can be done. In other cases, the geometry is invalid and so absurd that it is not possible to draw anything of it. If, for example, the shell inner diameter is smaller than the tubes outer diameter, only a simple circle will be drawn. These extreme cases were not considered in the previous version and sometimes non-sense artifacts were drawn.
- Minor bug fixes and improvements in the handling of the different systems of units.
Last Modified: 2020-11-26
Last Modified: 2020-11-26