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Calculate heat.
See it move.

Go from equations to experiments with QHeat. Solve heat transfer problems, explore thermal simulations, and build interactive scenes in the Heat Sandbox—all in your browser.

Start exploring QHeatExplore the tools

5

Focused calculators

3D

Thermal simulators

Heat

Physics Sandbox

Build a scene.
Watch energy move.

Turn a heat transfer question into a visual experiment. Draw solid regions, set material properties, add heat sources and fans, then explore how heat, fluid motion, radiation, sunlight, and particles interact in two dimensions.

Start with an example or a blank canvas. Pause, step through the simulation, and adjust your scene to investigate a different setup.

Open Heat Sandbox
01 / CREATE

Draw your experiment

Build with rectangles, ellipses, and polygons. Edit properties, add annotations, and refine your scene with undo and redo.

02 / EXPLORE

Connect the physics

Explore conduction, natural and fan-driven convection, radiation, sunlight, and particle heat and momentum exchange.

03 / MEASURE

Follow the results

Place temperature, heat flux, and airspeed sensors. Inspect readings, graphs, and flow visualizations as the scene evolves.

04 / KEEP

Continue your work

Open and save local scene files, export sensor readings as CSV, or sign in to store scenes in your account.

From a single unknown to a thermal experiment.

Choose a calculator for a focused problem, or explore how geometry, boundary conditions, and operating choices affect a simulation.

Heat transfer calculators

5 tools

Fourier’s law

Conduction

Calculate steady heat flow through a flat wall. Solve for heat transfer rate, conductivity, area, thickness, or temperature.

Open calculator

Newton’s law of cooling

Convection

Explore heat exchange between a surface and a fluid. Find the heat transfer rate, coefficient, area, or temperature.

Open calculator

Stefan–Boltzmann law

Radiation

Calculate net radiative heat transfer. Explore the relationship between emissivity, surface area, and absolute temperature.

Open calculator

Heat exchangers

LMTD method

Use inlet and outlet temperatures to calculate heat duty, overall heat transfer coefficient, or area, with parallel and counter flow options.

Open calculator

Heat exchangers

Effectiveness–NTU

Work with inlet temperatures and heat capacity rates to solve for heat duty, overall heat transfer coefficient, or area.

Open calculator

Keep the theory close.

Choose the variable you want to solve for, use example inputs to get started, and revisit the built-in Learn notes to understand the equations.

Interactive thermal simulations

3 tools

Geometry · Boundaries · Temperature

3D Thermal

Explore steady and transient heat transfer in blocks, cylinders, and pipes.

  • Set material properties, internal heat generation, and boundary conditions.
  • Include convection and radiation at boundaries.
  • Inspect temperature fields with sections and probes.
  • Save setups and export CSV data or PNG views.
Explore 3D Thermal

Flow arrangement · Profiles · Heat duty

Heat Exchanger

Investigate a concentric double-tube heat exchanger in parallel or counter flow.

  • Rotate the 3D cutaway to explore the geometry.
  • Follow hot and cold fluid temperature profiles.
  • Inspect positions along the exchanger and review outlet temperatures and heat duty.
  • Save setups and export CSV data or PNG visuals.
Explore Heat Exchanger

Circuit · Strategy · Thermal response

Tyre Thermal Management

Explore surface and carcass temperatures across all four wheels over a driving scenario.

  • Edit circuit segments and driving strategy phases.
  • Explore a 3D tyre cutaway and replay the temperature history.
  • Compare a run with a thermal baseline.
  • Save setups and export CSV data or chart PNGs.

Thermal presets are illustrative. This tool does not predict grip, wear, pressure, or lap times.

Explore Tyre Thermal Management

Ask. Explore.
Understand.

Move between numerical answers, visual experiments, and the theory behind them.

  1. 01

    Choose your question

    Solve an unknown with a calculator, investigate a thermal model, or build your own 2D scene in the Sandbox.

  2. 02

    Change the conditions

    Adjust inputs, materials, geometry, or operating conditions. Calculate or run again to see how the results respond.

  3. 03

    Keep what you learn

    Review theory and model notes, export supported simulation results, and save your work to revisit another time.

A few useful details.

Do I need an account to explore QHeat?

You can open the calculators, simulations, and Heat Sandbox as a guest. Sign in to save and reload work in your account.

Do I need to install anything?

QHeat runs in your web browser. Open the web app to access its calculators and interactive workspaces.

What can I save or export?

Save named calculations, simulation setups, and Sandbox scenes to your account.

Which languages are available?

QHeat supports English, Malay, German, and Japanese.

Start with your next question

Make heat transfer visible.

Open a calculator, explore a simulation, or build your first Sandbox scene. Your next experiment starts in QHeat.

Open QHeat