Example Data Table
| Model | Main inputs | Formula | Example result |
|---|---|---|---|
| Sensible heat | m = 2 kg, c = 4186 J/kg·K, ΔT = 60 K | Q = m × c × ΔT | 502,320 J |
| Latent heat | m = 1.5 kg, L = 334,000 J/kg | Q = m × L | 501,000 J |
| Conduction | k = 0.8, A = 1.5 m², ΔT = 60 K, d = 0.05 m, t = 60 s | Q = kAΔTt ÷ d | 86,400 J |
| Convection | h = 25, A = 1.5 m², ΔT = 60 K, t = 60 s | Q = hAΔTt | 135,000 J |
| Radiation | ε = 0.9, A = 1.5 m², Th = 373 K, Tc = 293 K, t = 60 s | Q = εσA(Th⁴ − Tc⁴)t | 55,351 J approx. |
Formula Used
Sensible heat: Q = m × c × ΔT. It estimates heat required for temperature change.
Latent heat: Q = m × L. It estimates heat absorbed or released during phase change.
Conduction: Q = k × A × ΔT × t ÷ d. It estimates heat through a solid barrier.
Convection: Q = h × A × ΔT × t. It estimates heat between a surface and moving fluid.
Radiation: Q = ε × σ × A × (Th⁴ − Tc⁴) × t. Here σ equals 5.670374419 × 10⁻⁸ W/m²K⁴.
How to Use This Calculator
Select the heat transfer model first. Enter only the values needed for that model. Use SI units for accurate results. Temperatures for sensible, conduction, and convection can use Celsius because only temperature difference is used. Radiation needs Kelvin values. Choose the output unit. Then press the calculate button.
Heat Energy Transfer in Physics
What Heat Transfer Means
Heat energy transfer describes energy movement caused by temperature difference. It always has a direction. Energy moves from a hotter region toward a colder region. The rate depends on material, surface area, time, and thermal conditions. This calculator helps compare common classroom and laboratory heat models.
Sensible and Latent Heat
Sensible heat changes temperature without changing state. A warm cup, heated metal block, or cooling liquid can use this model. The specific heat value shows how much energy one kilogram needs for one kelvin of change. Water has a large value. Metals usually have smaller values.
Latent heat is different. It changes phase while temperature stays nearly constant. Melting ice and boiling water are common examples. The latent heat value depends on the material and phase change. Fusion, vaporization, and sublimation use different constants.
Conduction and Convection
Conduction happens inside solids or across solid layers. A wall, metal plate, glass pane, or insulation sheet can be modeled with conduction. Higher thermal conductivity increases heat transfer. Larger area also increases transfer. Greater thickness reduces transfer.
Convection occurs at a surface in contact with a fluid. The fluid can be air, water, steam, or oil. Moving fluid usually raises the convection coefficient. Natural convection uses lower coefficients. Forced convection often uses larger coefficients.
Radiation Model
Thermal radiation depends strongly on absolute temperature. The fourth power term makes hot surfaces radiate much more energy. Emissivity describes how well a surface emits radiation. A blackened surface has high emissivity. Polished metal often has low emissivity.
Practical Use
Use this tool for lessons, homework checks, lab sheets, equipment estimates, and comparison work. Always check units before trusting a result. For advanced design, include losses, geometry, changing temperatures, and material data from trusted references.
FAQs
What is heat energy transfer?
Heat energy transfer is energy movement caused by temperature difference. It can occur by conduction, convection, radiation, or phase change. The process continues until thermal balance is approached.
Can Celsius be used in this calculator?
Celsius works for sensible heat, conduction, and convection because they use temperature difference. Radiation must use Kelvin because absolute temperature appears in the fourth power term.
What unit should specific heat use?
Use joules per kilogram per kelvin, written as J/kg·K. If your data uses another unit, convert it before entering the value.
What is latent heat?
Latent heat is energy absorbed or released during a phase change. The temperature may remain nearly constant while melting, freezing, boiling, or condensing occurs.
What is thermal conductivity?
Thermal conductivity tells how easily heat passes through a material. Larger values mean faster conduction. Metals are usually high. Insulation materials are usually low.
What does convection coefficient mean?
The convection coefficient measures heat transfer between a surface and a fluid. It depends on fluid type, speed, surface shape, and flow condition.
Why is radiation based on Kelvin?
Radiation follows the Stefan-Boltzmann law. That law uses absolute temperature. Kelvin must be used because zero kelvin represents absolute thermal reference.
Can this replace engineering software?
No. It is useful for estimates and study. Complex systems may need transient analysis, geometry corrections, fluid models, and verified material data.