Version 188.8.131.52. Build 2.1.7146.18255
New feature: Mixtures:
The new feature for Mixtures in HRS-AHED allows the user to
define mixtures of the following 48 compounds (initially, more to be
added in the future):
- Acetone, Acetylene, Air, Ammonia, Aniline, Argon,
- Benzene, Butane,
- Carbon dioxide, Carbon monoxide,
- Ethane, Ethanol, Ethylene, Ethylene dichloride (EDC), Ethylene glycol,
- Helium, Heptane, Hexane, Hydrochloric acid gas, Hydrogen,
- Methane, Methanol, Methyl amine,
- Nitric oxide, Nitrogen, Nonane,
- Octane, Oxygen,
- Pentane, Phenol, Propane, Propylene glycol,
- R-11, R-12, R-123, R-123a, R-124, R-134a, R-141b, R-143a, R-22, R-23,
- Sulfhydric acid, Sulfur dioxide, Sulfur trioxide,
- The purpose of a Mixture is to serve as a starting point for automatic and fully generation of a Fluid, with all its characteristics and properties. The option to manually define a Fluid, filling the data tables for each temperature and values for its properties, is still available, but this new feature automates and speeds-up this process. HRS-AHED still uses the concept of Fluid, and Mixtures serve as a previous step for having a Fluid in a quick way.
- The properties for each chemical compound, so as the mixtures of them, are made following the rules described in bibliography. These rules do not always have into account certain special particularities that each compound or mixture might have. As a result, the calculation of very polar compounds or with hydrogen bonds (usually) results in data with lower precision than those of, for instance, an alkane or a gas in standard conditions. For this reason, whenever you have empiric data available, these would be preferable. It is also worth revising the obtained results and if any of the properties are believed not to be correctly calculated, fix it manually. HRS cannot be yield responsible for the accuracy of the generated data. The models used for the generation of these compounds and mixtures are available on demand.
- It is possible to define Mixtures using either % molar and/or % mass proportions.
- It is also possible (and advisable) to save the Mixtures. Whenever a Fluid is calculated from a Mixture that has already been saved as such, the Fluid also saves (internally) the information for recovering the starting Mixture. So, if at a later time it would be needed, for instance, modifying the range of temperatures for which the Fluid is defined, or changing its pressure, or if the proportions of the Mixture change slightly, it is possible to quickly recalculate the Fluid, since the original Mixture can be retrieved. It will not be possible to regenerate/recalculate a Fluid from a Mixture that had not been explicitly saved, since the starting Mixture does not exist as such. It will be possible, however (if starting data is known), to create a new Mixture and generate the Fluid again, but it will not be as convenient nor as quick.
- As the same as for the rest of objects in the application (Projects, Fluids and Geometries), it is also possible to share Mixtures in Groups and send copies to other users of the application.
- The new feature for Mixtures in HRS-AHED allows the user to define mixtures of the following 48 compounds (initially, more to be added in the future):
- New non-iterative method for Heat Balance calculation when the free parameter is one of the shell temperatures (either at the inlet or at the outlet). This new method uses a new Enthalpy property of Fluids, dynamically calculated at the server-side (it is not shown as an additional column among the rest of fluid's properties).
- New (alternative) method for Nusselt calculation, from D.R. Oliver, applicable only to cases where laminar flow in tube-side is present. Nusselt values are calculated using the previous method (Sieder-Tate) and also using this new method, and at the end the program picks the larger of both values. In order to be able to use this method, the derivative function of Density of the fluid must be calculated. In order to achieve this, a polynomial interpolation of grade 4 is attempted over the Fluid's Densities data. If this derivative cannot be calculated, it is not possible to use the method of D.R. Oliver and only Sieder-Tate is used.
- An error has been fixed in the calculation of Area Needed that appeared in calculations with Full Baffles (Bell/Delaware Method) when also a manual value for KSide at the Shell Inlet or Outlet was forced.
- When (during the Overall Calculation) the Number of Modules per Block is modified (Geometry has been altered), despite being warned in the log, the application also shows a dialog box (pop-up).
- When the user manually overrides any of the K values (either with/without fouling, inlet/outlet at the shell/tubes), the calculation will always raise a warning. This is because when any of these values is fixed it is not possible to calculate the wall temperatures with the same precision, either outer (shell) or inner (tubes) or even the metal temperature (average of both). For this reason these values are not shown either in the Temperature vs. Area graphs.
- The Temperatures graph in the Batch tab was not showing the correct units of measure when Metric was not being used.
- Project Loading: In previous versions, when a Project was saved not having an active process (the end of the list, without naming it), it could not be loaded again. This issue has been fixed.
- Licenses: A problem has been solved that prevented already registered users from requesting new licenses in additional computers.
- When there were errors or warnings during the calculations and some fields were highlighted (red = error, orange = warning), with only placing the cursor inside this highlighted field and moving the focus onto another field without altering it, sometimes the highlighting disappeared. This error has been fixed.
- Size of Windows: In configurations with more than one monitor, sometimes the application could not be correctly maximized. This issue has been fixed.
- Undo & Redo: The Undo (Ctrl+Z) and Redo (Ctrl+Y) functions did not work correctly in certain cases. For instance, when changes right after an Overall Calculation were undo in a process with a Geometry with Baffles, if the user retried to perform the same Global Calculation an error message appeared. This error has been fixed.
- Minor bug fixes and improvements.
Last Modified: 2020-10-27
Last Modified: 2020-10-27