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Jasper Documentation

Open-source chemical process simulation for modern engineering teams.

Jasper provides complete visibility into your chemical processes. Build flowsheets, run simulations, and analyze results with a modern, intuitive interface. Automatically calculate material balances, energy requirements, and equipment sizing across your entire system.

Simulation Modes​

Jasper offers two simulation engines to match your needs:

  • Quick mode (browser-based) -- Ideal gas / Raoult's Law calculations running entirely in your browser. Instant results, no backend required.
  • Rigorous mode (IDAES-powered) -- Equation-oriented process simulation using the IDAES framework. Supports cubic equations of state (SRK, PR), activity coefficient models (NRTL, UNIQUAC, eNRTL), and 70+ validated components.

See Thermodynamics Overview for details on each engine's capabilities.

Why Jasper?​

Chemical process simulation is essential for designing efficient systems. When engineers design processes, understanding material balances and energy requirements is critical. Jasper gives you:

  • Thermodynamic calculations - Heat capacity, enthalpy, and vapor-liquid equilibrium using industry-standard correlations
  • IDAES rigorous simulation - Equation-oriented solving with SRK, PR, NRTL, UNIQUAC, and eNRTL property packages
  • Unit operation models - Comprehensive library including mixers, heaters, flash drums, reactors, and distillation columns
  • Component database - 50+ chemicals in Quick mode; 70+ in Rigorous mode with validated property data from NIST, DIPPR, Perry's, and RPP

Get started​

Quickstart

Get simulations running in under 5 minutes with our TypeScript SDK.

Thermodynamics

Heat capacity, enthalpy, and VLE calculation methods.

Unit Operations

Feed, mixer, flash, heater, reactor, and more equipment models.

Component Database

50+ chemicals with validated thermodynamic property data.

How it works​

The simulation engine uses a sequential modular approach:

  1. Topology analysis - Determine calculation order from flowsheet connectivity
  2. Block solving - Execute each unit operation in sequence
  3. Stream propagation - Pass outlet conditions to downstream units
  4. Convergence - Iterate on recycle streams until convergence

What gets calculated​

For each stream and unit operation, Jasper calculates:

  • Material balances (molar and mass flows)
  • Energy balances (enthalpy, heat duties)
  • Phase equilibrium (vapor/liquid splits)
  • Equipment sizing (preliminary)
  • Capital cost estimates (order of magnitude)