Thermal Engineering Simulators

2d Conduction Temperature Simulator

Explore a 2D steady conduction field, centerline temperature, and heat-flux direction from four boundary temperatures and conductivity.

Accelerated Life Arrhenius Model Simulator

Convert Arrhenius accelerated-test life to use-condition life from stress temperature, use temperature, activation energy, and observed test life.

Ahu Heat Balance Simulator

HVAC & Psychrometrics

Estimate AHU outlet temperature and sensible load from airflow, inlet dry-bulb temperature, coil surface temperature, and bypass factor.

Atkinson Cycle Simulator

Atkinson Cycle Simulator: Visualise the ideal cycle of the over-expanded engine, where the expansion stroke is longer than the compression stroke.

Bell-Coleman Cycle Simulator

Bell-Coleman Cycle Simulator: Visualise the ideal "reverse Brayton" refrigeration cycle that uses air itself as the working fluid.

Biot Number Simulator — Lumped Capacitance Validity for Transient Heat

Biot number simulator: real-time Bi = hL/k, lumped capacitance regime, time constant tau and Fo from convection, conductivity, characteristic length…

Black-Body Radiation Simulator

Black-Body Radiation Simulator: visualize Planck's law, Wien's displacement, Stefan-Boltzmann law.

Blackbody Color Temperature Simulator

Blackbody Color Temperature Simulator: Visualize spectrum shifts and radiated power changes across thermal wavelengths.

Blackbody Radiation Spectrum Simulator

Visualize Planck blackbody radiation curves in real-time. Compare multiple temperatures, see Wien's law and Stefan-Boltzmann calculations instantly.

Boiling Correlations Detail Simulator

Evaluate wall superheat, heat-transfer coefficient, and CHF margin from heat flux, pressure, diameter, and vapor quality.

Boiling Curve Simulator — Nukiyama Curve and Pool Boiling

Simulate Nukiyama boiling curves and pool boiling heat flux vs superheat at 1 atm.

Boiling Heat Transfer Calculator

Boiling Heat Transfer Calculator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that matte…

Brayton Cycle Simulator — Thermal Efficiency of a Gas Turbine

Brayton cycle simulator for gas turbines: analyze thermal efficiency with variable pressure ratio, temperature, and T-s diagrams.

Carnot Cycle Simulator — P-V & T-S Diagram, Thermal Efficiency

Visualize the Carnot cycle on P-V and T-S diagrams. Adjust hot and cold reservoir temperatures to explore the four processes and theoretical maximum thermal efficiency.

Chilled Water Coil Performance Simulator

Heat Exchangers

Chilled Water Coil Performance Simulator updates live numeric results and charts as inputs change, supporting early design checks and model review.

Newton's Law of Cooling — Coffee Simulator

Vary initial temperature, room temperature, and cooling constant k to calculate how long until your coffee reaches drinking temperature.

Combined Cycle Power Plant Simulator

Combined Cycle Power Plant Simulator: Model a power plant that pairs a gas turbine (Brayton cycle) with a steam turbine (Rankine cycle).

Film Condensation on a Vertical Plate Simulator

Film Condensation on a Vertical Plate Simulator compares how member deformation, stress, and support assumptions shifts as the main assumptions change.

Forced Convection Heat Transfer Calculator — Nusselt Number & h

Calculate forced convection heat transfer instantly. Enter fluid, velocity, and temperatures to get Re, Pr, Nu, and h. Compare fluids and use key equations.

Convective Drying Rate Calculator

Calculate drying times for constant-rate and falling-rate periods. Visualize the drying curve and rate with this convective drying calculator.

Cooling Coil Load Simulator — Sensible, Latent & Total Heat

HVAC & Psychrometrics

Cooling Coil Load Simulator calculates sensible, latent, and total heat loads from air states.

Cooling Tower Performance Simulator — Merkel / NTU Method

Heat Exchangers

Cooling Tower Performance Simulator — Merkel / NTU Method focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case…

Critical Radius of Insulation Simulator

Critical Radius of Insulation Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend tha…

Datacenter PUE Cooling Efficiency Simulator — hyperscale

HVAC & Psychrometrics

Datacenter PUE Cooling Efficiency Simulator — hyperscale: A tool that lets you pseudo-design hyperscale datacenters of the PUE 1.1 class achieved by…

Dew Point and Relative Humidity Calculator — Magnus Approximation

HVAC & Psychrometrics

A Magnus-approximation calculator that computes dew point, wet-bulb temperature, vapor pressure and humidity ratio from dry-bulb temperature and rela…

Diesel Cycle Simulator

Diesel Cycle Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Disc Brake Thermal Simulator

Disc Brake Thermal Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that matters n…

Dual (Sabathé) Cycle Simulator

Dual (Sabathé) Cycle Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that matters…

Outdoor & Return Air Enthalpy Mixing Simulator

HVAC & Psychrometrics

Outdoor & Return Air Enthalpy Mixing Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Ericsson Cycle Simulator

Ericsson Cycle Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Free-Water-Surface Evaporation Rate — ASHRAE / Carrier

Heat Exchangers

Free-Water-Surface Evaporation Rate — ASHRAE / Carrier focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case an…

Exergy Analysis Simulator

Exergy Analysis Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Fin Array Simulator — Heat Sink Total Heat Transfer

Heat Exchangers

Fin Array Simulator — Heat Sink Total Heat Transfer compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Fin Efficiency & Temperature Distribution Calculator

Heat Exchangers

Calculate fin efficiency, temperature distribution, and heat flux in real-time for rectangular, triangular, and parabolic fins with this engineering tool.

Fin Heat Transfer Simulator — Efficiency, Temperature Distribution & Optimal Design

Heat Exchangers

Master fin heat transfer: solve the governing equation, visualize temperature profiles, and calculate efficiency in real-time for CPU cooling design.

Finite Difference Heat Conduction Simulator — Explicit FDM & Stability

Simulate 1D heat conduction with explicit finite difference method. Learn the governing equation, stability criterion, and visualize temperature distribution.

Furnace / Boiler Efficiency Simulator

Furnace / Boiler Efficiency Simulator: Evaluate how effectively a boiler or industrial furnace turns fuel into useful heat, using the heat-loss metho…

Real Gas Compressibility Factor Simulator

Real Gas Compressibility Factor Simulator: The ideal-gas law PV = nRT is convenient, but real gases drift away from it at high pressure or low temper…

Intercooled Gas Turbine Simulator

Intercooled Gas Turbine Simulator: Visualise an ideal Brayton cycle whose compression is split into two stages with an intercooler between them.

Grashof Number Simulator — Natural Convection Characteristic Number

Grashof number simulator: real-time Gr = gBdTL^3/nu^2 for natural convection. Rayleigh number, Churchill-Chu Nusselt, and laminar/turbulent regime for a vertical plate.

Agricultural Greenhouse Energy Balance Simulator

HVAC & Psychrometrics

Agricultural Greenhouse Energy Balance Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

1D Transient Heat Conduction Simulator

Simulate 1D transient heat conduction with a finite difference model. Explore temperature profile evolution by changing initial and boundary conditions.

2D Heat Conduction FDM Simulator — Temperature Contour & Isotherms

Simulate 2D steady-state heat conduction with finite differences. Set boundaries, add a heat source, and visualize the temperature contour.

Transient Heat Conduction Heisler Chart Calculator — Plane Wall, Cylinder & Sphere

Analyze transient heat conduction in solids using Heisler chart methods. Real-time calculator for plane walls, cylinders, and spheres with 1-term approximation.

2D Transient Heat Conduction Simulator

Transient Heat Conduction Simulator (FDM): Solve ∂T/∂t = α∇²T using finite difference method in real time.

Heat Diffusion Equation Simulator

Experience real-time 2D heat diffusion. Click to place sources, adjust materials, boundaries, and speed to visualize the Fourier equation and temperature evolution.

2D Transient Heat Equation Simulator

Simulate 2D heat diffusion in real-time. Visualize with animation, add custom heat sources, and explore the finite difference method.

Heat Exchanger Design Calculator (NTU-ε & LMTD)

Heat Exchangers

Calculate heat exchanger outlet temperatures, effectiveness (ε), NTU, and LMTD instantly with this . Input flow rates, specific heats, and temperatures.

Double-Pipe Heat Exchanger Design Calculator (LMTD & NTU Method) — Parallel/Counter Flow

Heat Exchangers

Calculate double-pipe heat exchanger parameters: outlet temps, heat duty, LMTD, effectiveness, and tube length for parallel and counter flow designs.

Heat Exchanger Design Calculator (NTU-Effectiveness / LMTD Method)

Heat Exchangers

Design parallel, counter & crossflow heat exchangers in real-time. using NTU-effectiveness & LMTD methods with ε–NTU curves.

Shell & Tube Heat Exchanger Designer

Heat Exchangers

Design shell-and-tube heat exchangers. Calculate Q, LMTD, F-factor, required area, NTU, and effectiveness with temperature profiles.

Building Heat Loss Simulator — U-Value, R-Value & Heating Load Calculator

HVAC & Psychrometrics

Simulate building heat loss in real time. Adjust insulation for walls, roof, windows, and doors to visualize U-values and calculate annual heating energy needs.

Heat Pipe Performance Calculator — Capillary Limit & Effective Conductance

Calculate heat pipe performance: input fluid, wick type, temperature, and dimensions to get capillary limit, conductance, and max heat flux.

Heat Pump & Refrigeration COP Calculator — Carnot Cycle Efficiency

Calculate heat pump and refrigeration efficiency instantly. Adjust temperatures and Carnot factor to see COP, heat transfer, and annual energy costs.

Blackbody Radiation Simulator — Planck Distribution & Stefan-Boltzmann Law

Visualize Planck's blackbody radiation spectrum. Adjust temperature and emissivity to compare the Sun, light bulbs, and the human body in real time.

Energy Recovery Ventilator (ERV) Simulator

HVAC & Psychrometrics

An energy recovery ventilator reuses the heat and moisture in the indoor air thrown away by ventilation, transferring it to the incoming outdoor air.

HRSG (Heat Recovery Steam Generator) Simulator

A gas turbine throws away exhaust at 600°C.

Heat Sink Design Calculator (Electronics Cooling / Junction Temperature)

Heat Exchangers

Calculate junction temperature with our free online heat sink calculator.

Thermal Radiation Heat Transfer Calculator — Stefan-Boltzmann Law

Calculate thermal radiation heat transfer instantly. Use our calculator for real-time Q = εσA(T₁⁴−T₂⁴) results, heat flux visualization, and radiation analysis.

Heating Curve Simulator

Visualize temperature changes in real time as a substance is heated.

Heisler Chart Simulator — Transient Conduction

Compute transient conduction in a body that is initially at a uniform temperature and is suddenly exposed to convection, using the one-term approxima…

HVAC Thermal Load Calculator

HVAC & Psychrometrics

Calculate real-time HVAC thermal loads: envelope, solar gain, occupancy & ventilation. Get SHR, latent load formulas, and annual energy estimates.

Ideal Gas Simulator (PVT Surface)

Ideal gas simulator. Visualize PV=nRT with real-time molecular animation and a 3D PVT surface; vary T and moles to see pressure, density and energy respond.

Jet Engine Performance Calculator — Brayton Cycle T-s Diagram

Analyze turbojet & turbofan Brayton cycles. Set pressure ratio, TIT, bypass ratio & efficiencies to compute thermal efficiency, specific thrust & SFC.

Jet Impingement Cooling Simulator — Heat Transfer on the Plate

Jet Impingement Cooling Simulator — Heat Transfer on the Plate focuses on member deformation, stress, and support assumptions, giving a compact read on the current case …

Joule-Thomson Effect Simulator — Throttle Expansion and Temperature Change

Joule-Thomson Effect Simulator: Calculate temperature changes during throttle expansion using van der Waals gas model, Joule-Thomson coefficient, and…

LED Design & Thermal Calculator

Optimize LED performance with real-time thermal calculations for efficiency, junction temperature, luminous flux, and bin selection. Find the ideal operating point.

LED Junction Temperature & Thermal Design Simulator

LED Junction Temperature & Thermal Design Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and t…

LMTD Simulator — Log Mean Temperature Difference for Counter and Parallel Flow

Heat Exchangers

LMTD Simulator — Log Mean Temperature Difference for Counter and Parallel Flow focuses on heat transfer, temperature difference, and cooling margin, giving a compact rea…

Lumped Capacitance Method

Visualize transient heat conduction and verify Biot number validity in real time. Compare cooling/heating curves for steel, aluminum, and more materials.

Maxwell-Boltzmann Speed Distribution Simulator

Maxwell-Boltzmann speed distribution simulator. Compute f(v) of an ideal gas from temperature and molar mass in real time, with most-probable, mean and RMS speeds.

Mean Free Path Simulator — Kinetic Theory of Gases

Mean free path simulator: real-time hard-sphere lambda, mean speed, collision frequency and number density from temperature, pressure, molecular diameter and molar mass.

Multi-Layer Wall Thermal Resistance & U-Value Calculator

Calculate thermal resistance, U-value, and interface temperatures for multi-layer walls (up to 5 layers) with this real-time visualization tool.

Natural Convection Heat Transfer Coefficient Calculator

Calculate natural convection heat transfer coefficients instantly with our . Accurate, easy-to-use, and no registration required.

Otto Cycle Simulator — Thermal Efficiency of a Spark-Ignition Engine

Compute Otto-cycle thermal efficiency and 4-state temperatures from compression ratio, specific heat ratio, intake temperature and heat input. Higher r raises efficiency.

Overall Heat Transfer Coefficient Simulator

Heat Exchangers

Overall Heat Transfer Coefficient Simulator: Compute the overall heat transfer coefficient U for a wall separating two fluids in a heat exchanger, pi…

Passive House Air Tightness n50 Blower Door Simulator

HVAC & Psychrometrics

Passive House Air Tightness n50 Blower Door Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

PCB Thermal Analysis · Junction Temperature Calculator

Calculate PCB junction temperature with thermal resistance models. Supports BGA, QFP, TO-220, MOSFET packages. Includes heatsink and thermal via analysis.

Phase Change Material (PCM) Thermal Analysis Tool

Simulate 1D melting of ice, paraffin, and molten salt using the enthalpy method. Visualize phase change behavior with this finite difference analysis tool.

Piston Engine Thermodynamics Simulator — Otto & Diesel Cycle P-V Diagram

Simulate Otto and Diesel engine cycles in real-time.

Polytropic Process Simulator

Polytropic Process Simulator compares how manufacturing conditions, quality margin, and process sensitivity shifts as the main assumptions change.

Psychrometric Chart Calculator — Dry-Bulb, Humidity Ratio & Enthalpy

HVAC & Psychrometrics

Plot air properties on a live psychrometric chart. Adjust temperature and humidity to instantly calculate dew point, enthalpy, and humidity ratio.

Radial Conduction Through a Sphere Simulator

Radial Conduction Through a Sphere Simulator: Visualise steady-state heat conduction flowing radially through a spherical shell — for example the ins…

Radiant Cooling Load Simulator

HVAC & Psychrometrics

Radiant Cooling Load Simulator: Design a radiant cooling system that puts cold panels on the ceiling (chilled-ceiling cooling).

Radiation Network Simulator — Surface & Space Resistances

Radiation Network Simulator for gray surface heat transfer analysis.

Radiation View Factor Calculator

Radiation View Factor Calculator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Rankine & Refrigeration Cycle Simulator

Visualize Rankine and refrigeration cycles on T-s and P-h diagrams. Calculate efficiency, COP, and more with this real-time cycle simulator.

Refrigerant Selection & Environmental Properties Comparison Tool

Compare 20 refrigerants by GWP, ODP, safety, and COP. Check F-Gas & SNAP compliance. Find replacements for R-22 and R-134a with efficiency analysis.

Vapor Compression Refrigeration Cycle Calculator — P-h Diagram & COP

Calculate refrigeration cycle performance instantly.

Vapor Compression Refrigeration Cycle Designer — COP, Capacity & P-h Diagram

Design and analyze vapor compression cycles. Input temperatures, superheat, subcooling, and compressor efficiency to instantly compute COP, capacity, and compressor work.

Regenerator Effectiveness Simulator

Heat Exchangers

Regenerator Effectiveness Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that ma…

Sensible Heat Factor (SHF) Calculator — HVAC Load Balance

HVAC & Psychrometrics

Sensible Heat Factor (SHF) Calculator — HVAC Load Balance compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Window Solar Heat Gain (SHGC) Simulator

HVAC & Psychrometrics

Window Solar Heat Gain (SHGC) Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend tha…

Specific Heat & Calorimetry Simulator

Specific Heat & Calorimetry Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that …

Stack Effect (Chimney Draft) Simulator

HVAC & Psychrometrics

Stack Effect (Chimney Draft) Simulator: Visualise the "stack effect" that arises because warm air is light and cold air is heavy.

Steam Properties Calculator — Mollier Diagram & Steam Tables

Calculate steam properties instantly with our tool. Input temperature and pressure to get thermodynamic data and visualize Mollier, P-v, and T-s diagrams.

Steam Rankine Cycle Calculator

Calculate thermal efficiency and T-s diagrams for Steam Rankine cycles in real time. Adjust pressure, efficiency, and toggle reheat.

Steam Tables Simulator — Water/Steam Thermodynamic Properties

Specify temperature or pressure to calculate specific volume, enthalpy, and entropy for saturated water, saturated steam, and superheated steam in re…

Stefan-Boltzmann Radiation Calculator

Calculate radiative heat transfer instantly with our blackbody calculator. Visualize Planck spectrum, emissive power, and peak wavelength using key radiation laws.

Stirling Engine Cycle Simulator

Animate the Stirling cycle (isothermal expansion, isochoric cooling, isothermal compression, isochoric heating) on a P-V diagram. Compare thermal efficiency to Carnot.

Swimming Pool Heat Loss & Evaporation Simulator

Swimming Pool Heat Loss & Evaporation Simulator: Real-time evaporative, convective and radiative heat loss for indoor and outdoor swimming pools usin…

Thermal Bridge 2D Heat Conduction Simulator

Simulate 2D steady-state heat conduction in walls. Visualize temperature contours and isotherms using the finite difference method.

Thermal Camera Simulator

Simulate 2D heat flow in real-time. Paint heat sources, cold sinks, and insulators. The thermal camera solves physics with Jacobi iteration for realistic rendering.

Thermal Barrier Coating (TBC) Calculator — Multilayer Heat Resistance

Thermal Barrier Coating (TBC) Calculator — Multilayer Heat Resistance focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the …

Thermal Comfort PMV/PPD Simulator (ISO 7730)

HVAC & Psychrometrics

Thermal Comfort PMV/PPD Simulator (ISO 7730) focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the tren…

Thermal Comfort (PMV-PPD) Simulator

HVAC & Psychrometrics

A tool for Fanger's thermal-comfort model (ISO 7730), which turns "hot" and "cold" into numbers.

Thermal Contact Resistance Simulator

Thermal Contact Resistance Simulator: Evaluate the "thermal contact resistance" at a joint where two solids are pressed together.

Thermal Expansion & Thermal Stress Calculator

Thermal Expansion & Thermal Stress Calculator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Thermal Expansion Calculator

Calculate thermal expansion for any material. Input dimensions and temperature change to get linear, area, and volumetric results, plus stress and strain.

Thermocouple Transient Response Simulator — First-Order Lag

Thermocouple Transient Response Simulator — First-Order Lag compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Thermocouple Seebeck EMF Simulator

Thermocouple Seebeck EMF Simulator focuses on nearby design assumptions and key metrics, giving a compact read on the current case and the trend that matters next.

Thermodynamic Cycle Calculator (Carnot, Otto, Diesel, Brayton)

Visualize Carnot, Otto, Diesel, and Brayton cycles on P-V and T-s diagrams in real time. Instantly compute thermal efficiency, net work, and heat exchange quantities.

Thermosiphon Loop Simulator

Thermosiphon Loop Simulator focuses on flow rate, pressure loss, and hydraulic margin, giving a compact read on the current case and the trend that matters next.

Transient Semi-Infinite Solid Simulator

Calculate how the temperature of a "very thick body" soaks inward with time after its surface temperature is suddenly changed.

Vaccine Cold Chain Thermal Mass Holdover Simulator

Vaccine Cold Chain Thermal Mass Holdover Simulator compares how heat transfer, temperature difference, and cooling margin shifts as the main assumptions change.

Van der Waals Gas Simulator — Real Gas Compressibility Factor

Van der Waals gas simulator computing real gas compressibility factor Z, molar volume, and critical points from pressure and temperature constants.

CO₂-Based Ventilation Rate Simulator

HVAC & Psychrometrics

CO₂-Based Ventilation Rate Simulator focuses on heat transfer, temperature difference, and cooling margin, giving a compact read on the current case and the trend that m…

WBGT (Wet Bulb Globe Temperature) Heat Index Simulator

HVAC & Psychrometrics

Compute WBGT heat index in real time from temperature, humidity, and radiation.

Wien Displacement Law Simulator — Peak Wavelength of Black-Body Radiation

Wien displacement simulator: real-time peak wavelength from lambda_max*T=b and Stefan-Boltzmann q=eps*sigma*T^4, plus total radiated power and irradiance at distance R.