Wall Heat Conduction
Compute conduction heat rate Q via Fourier's law from k, A, ΔT and thickness L.
Inputs
Formula
Q = k·A·ΔT/L
Multi-layer walls add thermal resistances in series.
Fundamentals
Compute conduction heat rate Q via Fourier's law from k, A, ΔT and thickness L.
This tool computes Wall Heat Conduction from the formula: Q = k·A·ΔT/L
History
Fluid mechanics and heat transfer were established in the 18th–19th centuries with steam engines and thermodynamics.
Engineering applications
Used for piping, heat-exchange and hydraulic system estimates.
Glossary
| Conductivity k | Input parameter |
| Area A | Input parameter |
| Temp diff ΔT | Input parameter |
| Heat rate Q | Output result |
How to use
- Fill in Conductivity k, Area A, Temp diff ΔT, Thickness L in the Inputs section (watch the unit on each field).
- Click Calculate; the tool evaluates the formula shown above.
- Read Heat rate Q in the results area.
Formula · Worked Example · Knowledge
Formula
核心计算关系：Q = k·A·ΔT/L
输入变量：
- Conductivity k
k— W/(m·K) - Area A
A— m² - Temp diff ΔT
dT— K - Thickness L
L— m
输出结果：
- Heat rate Q
Q— W
假设/适用：Flow formulas assume steady, incompressible, continuous flow; correct for compressible/high-speed.
Worked Example
根据公式 Q = k·A·ΔT/L，取 Conductivity k = 45 W/(m·K)；Area A = 1 m²；Temp diff ΔT = 100 K；Thickness L = 0.02 m。
代入计算得：Heat rate Q = 225,000 W。
Key Points
- Flow formulas assume steady, incompressible, continuous flow; correct for compressible/high-speed.
- Reynolds Re sets laminar/turbulent; friction f depends on regime & roughness.
- Energy eqn includes elevation, pressure and velocity heads; keep units as length.
Parameters
Inputs
| Parameter | Symbol | Unit | Default |
|---|---|---|---|
| Conductivity k (W/(m·K)) | k | W/(m·K) | 45 |
| Area A (m²) | A | m² | 1 |
| Temp diff ΔT (K) | dT | K | 100 |
| Thickness L (m) | L | m | 0.02 |
Outputs
| Result | Symbol | Unit |
|---|---|---|
| Heat rate Q | Q | W |
Applications
- Pipe flow rate and pressure drop
- Hydraulic cylinder force/speed design
- Flow-meter selection and calibration
FAQ
What formula does this tool use?
This tool computes per ISO / AGMA / ASME standard formulas: Q = k·A·ΔT/L
How accurate are the results?
Results match input precision, based on SI units and common engineering approximations; for critical duty re-check with a safety factor.
Where is it used?
Pipe flow rate and pressure drop