Audit in 138
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Navigation: Main Page -> Models -> Common Sections
This page is for Build 138 or earlier. For Build 139 or later please see Audit.
The details and values on the Audit tab page are only created after the SysCAD Solver has been started. It displays a summary of information required for mass and energy balance around the unit operation. This functionality can be enabled or disabled using the option "PlantModel.Audit.Action" on the Settings Tab Page of the Plant Model. If this is not required then this can be switched off which will provide a small improvement on solver speed.
Audit Summary
Next to each of the following fields there will be up to five columns. The columns are:
- Qm: The total mass flow in the current iteration.
- Mt: Total accumulated mass since the project was last restarted, only visible in a Dynamic project.
- Hf: The Total Enthalpy of all species in the current iteration.
- TotalHf: Total accumulated Enthalpy since the project was last restarted, only visible in a Dynamic project.
- AuditSp: This column is only visible if the Audit level chosen is Species (see "PlantModel.Audit.Level" on the Settings Tab Page of the Plant Model). If the tick box is selected, then that field will appear as an additional column in the Species Flows Table on the AuditSp page. The result will then be shown for each species.
| Tag / Symbol | Description | |
|---|---|---|
| --In-- | ||
| Sources (Sr) | Material/energy which has been added via a reaction source, or if the unit is a Feeder then this is the amount of material delivered by the Feeder. (Note, a Feeder is a true source of material to the project, unlike a cross page connector which moves material from one flowsheet to another.) | |
| Makeups (Mu) | Material/energy which has been added via a Makeup Block. | |
| Links.In (Li) | Material/energy which has entered the unit via a link (pipe). | |
| Leaks.In (Ki) | This is only visible in a dynamic project. | |
| Other.In (Oi) | Energy added such as from an EHX block or Heat Exchange option in a Reaction Block. | |
| --Out-- | ||
| Sinks (Sn) | Material/energy which has been removed via a reaction sink, or if the unit is a Sink then this is the amount of material removed via the Sink. (Note, a Sink is a true sink of material from the project, unlike a cross page connector which moves material from one flowsheet to another.) | |
| Spills (Sp) | Material/energy which has been spilt. This is only visible in a dynamic project. | |
| Vents (Vn) | Material/energy which has been vented. This is only visible in a dynamic project. | |
| Discards (Di) | Material/energy which has been removed via a Discard Block. | |
| Links.Out (Lo) | Material which has left the unit via a link (pipe). | |
| Leaks.Out (Ko) | This is only visible in a dynamic project. | |
| Other.Out (Oo) | Energy removed externally such as from an EHX block or Heat Exchange option in a Reaction Block. | |
| --Audit-- | ||
| Total.In (I=Sr+Mu+Li+Ki+Oi) | The Total of all inputs = Sources (Sr) + Makeups (Mu) + Links In (Li) + Leaks In (Ki) + Other In (Oi) | |
| Total.Out (O=Sn+Sp+Vn+Di+Lo+Ko+Oo) | The Total of all outputs = Sinks (Sn) + Spills (Sp) + Vents (Vn) + Discards (Di) + Links Out (Lo) + Leaks Out (Ko) + Other Out (Oo) | |
| Total.Nett (O-I) | Total.Out - Total.In | |
| Accumulation (Ac) | This is only visible in a dynamic project. The amount of material added to a surge unit. | |
| Depletion (Dp) | This is only visible in a dynamic project. The amount of material removed from a surge unit. | |
| Error ((O+Dp)-I-Ac) | The absolute error. For a ProBal project, this will the same as Total.Nett. For a dynamic project this will be Total.Out + Depletion - Total.In - Accumulation | |
| Error.Rel | This is the relative error. | |
Audit Details Table
| Tag / Symbol | Description |
|---|---|
| Audit Details | |
| Details... | |
| Copy to Clipboard Options: Note: Before pasting copied data onto MS Excel, please ensure 'R1C1 reference Style' is checked in Options -- General. Note Also: This block copy includes a default SysCAD report, so once the tags are pasted (to set up the report in Excel), you can refresh the table by running a SysCAD value report in the normal manner. | |
| CopySimple | This button will copy onto the clipboard a simple version of the mass and energy balance around the unit operation where a single table will be presented regardless of the number of nodes present. |
| CopyFull | This button will copy onto the clipboard a full version of the mass and energy balance around the unit operation. |
| Mass.In (M1) | Mass flow in |
| Mass.Gain (M2) | Mass added by the Model |
| Mass.Gain.RCT (M3) | Mass added/removed by a Reaction Block using Sources or Sinks. |
| Mass.Out (M4) | Mass flow out |
| FeedCp@T | Heat Capacity at Feed (Entry) Conditions. |
| ProdCp@T | Heat Capacity at Product (Exit) Conditions. |
| TotalHeat.In (H1) | Total Heat flowing in (Sensible + Heat of formation) |
| TotalHeat.Gain | Total Heat associated with MassGain |
| TotalHeat.Gain.RCT | Total Heat associated with MassGain.RCT |
| TotalHeat.Out (H2) | Total Heat flowing out |
| TotalHeat.Change (H3=H2-H1) |
Total Heat Change. This will normally be zero if: 1. There is no energy loss to the environment; 2. No reactions have Heat of Reaction (HoR) override; or 3. There are no Sources or Sinks in the Reaction Block. If any of the above scenarios are true, then this value will not be zero. |
| PowerIn | Heat flow from External Heat Source |
| PowerIn.RCT | Heat flow from External Heat Source in Reaction Block |
| PowerIn.RCT.SrcCorr | Heat flow from External Heat Source in Reaction Block due to Sources |
| PowerIn.RCT.SnkCorr | Heat flow from External Heat Source in Reaction Block due to Sinks |
| PowerIn.EHX | Heat flow from External Heat Source in Environmental Heat Exchange sub-model |
| SensibleHeat.In (S1) | Sensible Heat flowing in |
| SensibleHeat.Gain | Sensible Heat associated with MassGain |
| SensibleHeat.Gain.RCT | Sensible Heat associated with MassGain.RCT |
| SensibleHeat.Out (S2) | Sensible Heat flowing out |
| SensibleHeat.Change (S3=S1-S2) |
Sensible Heat Change |
| VLE.HfChange@0 | Sensible Heat Change due to Phase changes in VLE block |
| HOR.Std@0 | HOR @ 0°C calculated by the 'Standard' Species Model (relies on SDB). This includes the heat of dilution term. |
| HOR.Mdl@0 (R1) | HOR @ 0°C and Reaction pressure, calculated by the 'Current Species Model' (may rely on SDB) |
| HOR.Used@0 (R2) | HOR @ 0°C and Reaction pressure actually used. This will be different to the above terms if a HOR override has been used. This excludes the heat of dilution term. |
| HOR.HtDil@0 (R3) | HOR @ 0°C for heat of dilution. Refer to Heat of Dilution in Reaction Energy Calculations for details on how this is calculated. |
| HOR.Work@0 (R4) | HOR @ 0°C for work done to compress/expand gases |
| HOR.Diff@0 (R5=(R2+R3+R4)-R1) |
HOR Difference @ 0°C. This will be non-zero if a HOR override has been used. |
| HOR.Used@Ref | HOR @ 0°C and Reference pressure of 101.325kPa. |
| HOD.(Compound)@0.Nett | Heat of Dilution due to compound @ 0°C and Reference pressure of 101.325kPa. This is for the change in concentration for the common flow between the input and output streams (i.e. minimum flowrate of inputs sum and outputs sum). |
AuditSp
This page is only visible if species audit is chosen.
Species Flows
| Audit Species Flows | ||||
| Basis | (1) All (2) Individual Phase. This will only change the display order if additional phases are present. | |||
| SpeciesFlow | Total.In | Total.Out | Total.Nett | Additional columns will be displayed here based on what is selected in the Audit Summary Table - Specie.Audit Column |
|---|---|---|---|---|
| Species x | Total In for Species x | Total Out for Species x | Difference of Species x in - out | Additional fields please refer to Audit Summary Table for details. |
Species Content
This table is only visible in a dynamic project.
| Audit Species Content | |||
| SpeciesContent | Accumulation | Depletion | Content |
|---|---|---|---|
| Species x | Total of Species x Accumulated in the content since start of Run | Total of Species x depleted from the content since start of Run | Species x in the content. |