PsychroPrint is a native Windows desktop app for producing accurate, print-ready psychrometric charts in IP units. PsychroLib 2.5.0 is bundled into the published executable and supplies the psychrometric property calculations.
- Calculates standard barometric pressure from a user-selected elevation in feet.
- Draws dry-bulb temperature, humidity ratio, saturation, relative-humidity, wet-bulb, enthalpy, and specific-volume lines in IP units.
- Displays humidity ratio in grains of moisture per pound of dry air by default, with an optional lb moisture/lb dry-air scale; the maximum-range input switches units with the printed ruler.
- Labels wet-bulb temperature directly on the saturation boundary and places enthalpy on a separate offset scale connected to the constant-enthalpy family.
- Supports Letter, Legal, 11 x 17 Tabloid/Ledger, ANSI C/D/E, Arch A/B/C/D/E, and custom paper dimensions in inches.
- Supports portrait and landscape output.
- Selects 1 F, 2 F, or 5 F dry-bulb grid spacing; 1 F is the default engineering grid.
- In the 1 F engineering grid, draws dotted wet-bulb lines every 1 F with distributed 5 F labels, plus a clipped enthalpy band with solid 5 Btu/lb chart continuations, solid 1 Btu/lb external divisions, and dashed 0.2 Btu/lb subdivisions.
- Adds labeled state points from dry-bulb temperature and relative humidity.
- Provides advanced control of all 13 printed color families, with Engineering, Monochrome, and Blueprint defaults plus persistent custom presets.
- Previews and prints the same vector scene through the native Windows print dialog.
- Exports a true vector PDF with an exact paper-size MediaBox.
Requirements: Windows 10 or 11 and the .NET 8 SDK or newer.
For development:
.\run.ps1Choose the elevation, paper, orientation, temperature range, humidity-ratio units, and maximum humidity ratio. Select Update preview, then use Export PDF or Print. For PDF printing, select Actual size or 100% rather than Fit when dimensional page fidelity matters.
To run verification and create a self-contained portable executable:
.\build.ps1The script restores the official PsychroLib 2.5.0 NuGet package, runs numerical and PDF verification, publishes a self-contained single-file win-x64 executable, and creates dist\PsychroPrint-win-x64.zip.
The portable executable is written to:
dist\PsychroPrint\PsychroPrint.exe
No Python installation or separate PsychroLib installation is required for the published executable.
Psychrometric calculations are provided by PsychroLib 2.5.0, copyright 2018-2020 The PsychroLib Contributors and licensed under the MIT License. The NuGet package credits D. Thevenard, D. Meyer, and DJGosnell; the upstream project acknowledges DJGosnell for the C# port.
For research use, cite D. Meyer and D. Thevenard, "PsychroLib: a library of psychrometric functions to calculate thermodynamic properties of air," Journal of Open Source Software 4(33), 1137 (2019), doi:10.21105/joss.01137, and the PsychroLib 2.5.0 software archive.
PsychroLib documents its equations and coefficients as originating in Chapter 1, Psychrometrics, of the 2017 ASHRAE Handbook—Fundamentals. PsychroPrint's chart organization also follows established psychrometric-chart conventions and was visually informed by an ASHRAE Psychrometric Chart No. 1 reference supplied during development.
No ASHRAE chart file, scan, logo, or other ASHRAE artwork is included in this repository or generated by the software. ASHRAE® is a registered service mark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. PsychroPrint is an independent project and is not affiliated with, sponsored by, certified by, or endorsed by ASHRAE.
See THIRD_PARTY_NOTICES.md for the complete dependency notice and license text.
PsychroPrint source code and original project assets are available under the MIT License. Third-party components and referenced publications remain subject to their respective licenses, copyrights, and trademarks.
- The app creates a
Psychrometrics(UnitSystem.IP)instance and does not expose SI inputs or outputs. - Elevation pressure uses PsychroLib's standard-atmosphere relationship; it is station pressure, not a weather-adjusted sea-level pressure.
- Chart curves are sampled at 0.5 F or finer and exported as vector paths. The saturation boundary is sampled at 0.25 F.
- A printer must support the selected sheet size. If its driver rejects a custom size, export PDF and print on a device configured for that media.
- PsychroPrint is an engineering calculation aid. Project design values and final selections remain the engineer's responsibility.
src\PsychroPrint- WPF app, chart engine, WPF renderer, and vector PDF exporter.tests\PsychroPrint.Verification- dependency-free numerical and output checks.output\pdf- generated verification chart.dist- portable published app and ZIP package.