How do I calculate heat loss through a wall?

Q = A·ΔT/R_total. For a composite wall with insulation (k=0.04, L=0.1m): R = 0.1/0.04 = 2.5 m²K/W. ΔT = 25°C: q = 25/2.5 = 10 W/m².

What is thermal conductivity vs thermal diffusivity?

Thermal conductivity k (W/mK) is steady-state heat transport per unit gradient. Thermal diffusivity α = k/(ρc_p) (m²/s) governs transient heat conduction (how quickly temperature changes propagate).

How does temperature affect thermal conductivity?

Metals: k decreases slightly with T. Nonmetals and gases: k increases with T. Insulation materials: k increases with T. Always use k at mean temperature for accurate calculations.

Conduction Heat Flux Calculator

Apply Fourier law: q = -k·A·(dT/dx). Thermal conductivities: copper 385 W/mK, steel 50, concrete 1.4, wood 0.15, mineral wool 0.04, aerogel 0.015 W/mK. Cylindrical and spherical conduction.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Apply Fourier law: q = -k·A·(dT/dx). Thermal conductivities: copper 385 W/mK, steel 50, concrete 1.4, wood 0.15, mineral wool 0.04, aerogel 0.015 W/mK. Cylindrical and spherical conduction. Use the conduction result to inform your clinical assessment.

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Frequently Asked Questions

How do I calculate heat loss through a wall?

What is thermal conductivity vs thermal diffusivity?

How does temperature affect thermal conductivity?