Excel Psychrometric Tool

Excel Psychrometric Tool

Use this skill to create a macro-enabled Excel workbook for quick moist-air calculations.

Assume Windows, PowerShell, and desktop Excel. Prefer creating or refreshing a workbook in the current workspace and leaving it open for the user.

Workflow

1. Confirm that Excel is already running when the user says it is open. If needed, attach to the active Excel instance.
2. Run scripts/build_excel_psychrometric_tool.ps1 to create or refresh the workbook.
3. Save the workbook as psychrometric_air_tool.xlsm in the current workspace unless the user asks for a different path or name.
4. Leave the workbook open in Excel.
5. Verify the calculator with one known case, then clear the sheet and save it blank.

Quick Rules

• Use the bundled PowerShell script instead of rebuilding the workbook logic by hand.
• Use standard atmospheric pressure 101.325 kPa.
• Use these units:
  • air temperature: deg C
  • relative humidity: %
  • humidity ratio: g/kg dry air
  • dew point temperature: deg C
• Mark direct user inputs red and calculated outputs green.
• Provide Calculate and Clear buttons in the workbook.
• Keep the calculator behavior conservative and explicit when inputs are inconsistent.

Important Limitation

Do not claim that every pair of inputs is enough. Humidity ratio + dew point temperature are both vapor-pressure information, so they do not uniquely determine air temperature and relative humidity. The workbook should explain this and show a prompt instead of inventing values.

Script Usage

Run the bundled script from the current workspace:

& ".\skills\excel-psychrometric-tool\scripts\build_excel_psychrometric_tool.ps1"

To override the workbook location:

& ".\skills\excel-psychrometric-tool\scripts\build_excel_psychrometric_tool.ps1" -OutputPath ".\custom_name.xlsm"

Validation

After creating the workbook, verify one known case before handing it off:

1. Enter 25 for air temperature.
2. Enter 50 for relative humidity.
3. Run the calculate macro.
4. Expect approximately:
   • humidity ratio: 9.86 g/kg dry air
   • dew point: 13.86 deg C
5. Confirm the two entered cells are red and the two calculated cells are green.
6. Run the clear macro and save the workbook blank.

Deliverable

Report the workbook path, whether Excel was already open, the verification result, and the humidity ratio + dew point limitation.