Engineering & Science

Psychra

Air-handling design you can audit.

Traceable air-handling unit (AHU) design. Every number shows its formula, inputs and reference, with mass and energy balance checks at every stage and an interactive psychrometric chart.

Book a demo Try the live demo

Psychra · workflow illustration

OfflineRuns in Edge or Chrome

TraceableEvery number has its source

SI / IPUnits handled automatically

PDFPrint-ready reports

Try it

See it work, right here.

An interactive illustration of how Psychra works, running in your browser with sample data.

Please note: this live demo animates only part of how Psychra works, using sample data. It is not the real interface, and it shows a small fraction of the application. It is meant to give you an intuitive idea of how it works. Book a demo to see the real software.

Features

Everything you need, nothing you don’t.

Complete component library

Mixing, filtration, heat recovery, cooling and dehumidification, heating, humidification, fans, ducts and room loads.

Interactive psychrometric chart

See every state point and process line plotted live as you change the design.

Click-to-trace calculations

Click any number to see its formula, the values substituted in, the assumptions and the reference, then walk back to the raw inputs.

Balance checks

Mass and energy balances are checked at every stage. Anything that does not close is highlighted immediately.

Envelope sweep

Sweep a whole range of temperature and humidity conditions and see which condition sizes each component.

Settling estimate

Estimate how long a space takes to move between two set-points and compare it with your target.

How it works

Four steps, start to finish.

Define

Set the conditions, airflow and room loads.

Build

Assemble the AHU from components.

Analyse

Check states, balances and the envelope.

Report

Export a traceable PDF report.

Compare

How Psychra stands out.

Capability	Building load software	Manufacturer selection tools	Spreadsheets
Every number traceable to formula and source	Varies		Varies
Vendor-neutral
Multi-component AHU process design	Varies		Varies
Mass and energy balance checks	Varies	Varies
Operating-envelope sweep	Varies	Varies
Runs offline with no install

Comparison reflects typical products in each category. Individual products vary.

Built for

Who uses Psychra

HVAC and building-services engineersCleanroom and controlled-environment designersDesign consultantsEngineers reviewing contractor calculations

Platform: Single offline file in Edge or Chrome
Units: SI and IP
Reports: Print-ready PDF
Projects: Saved as files you control
Analysis modes: Single point, envelope, settling
Internet needed: No

FAQ

Questions, answered.

Where do the formulas come from?

Each calculation carries its own reference to standard engineering sources, shown right next to the result.

Does it replace manufacturer selection software?

Psychra designs and checks the process independently of any manufacturer. You can then use any supplier’s tools to select equipment that meets it.

Does it need installation?

No. It runs offline as a single file in Edge or Chrome.

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