Convective Heat Transfer
Compute convective heat rate Q from film coefficient h, area A and ΔT (Newton's law).
Inputs
Formula
Q = h·A·ΔT
Forced convection h is much higher than natural.
Fundamentals
Compute convective heat rate Q from film coefficient h, area A and ΔT (Newton's law).
This tool computes Convective Heat Transfer from the formula: Q = h·A·ΔT
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
| Film coeff. h | Input parameter |
| Area A | Input parameter |
| Temp diff ΔT | Input parameter |
| Heat rate Q | Output result |
How to use
- Fill in Film coeff. h, Area A, Temp diff ΔT 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 = h·A·ΔT
输入变量：
- Film coeff. h
h— W/(m²·K) - Area A
A— m² - Temp diff ΔT
dT— K
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 = h·A·ΔT，取 Film coeff. h = 50 W/(m²·K)；Area A = 1 m²；Temp diff ΔT = 50 K。
代入计算得：Heat rate Q = 2,500 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 |
|---|---|---|---|
| Film coeff. h (W/(m²·K)) | h | W/(m²·K) | 50 |
| Area A (m²) | A | m² | 1 |
| Temp diff ΔT (K) | dT | K | 50 |
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 = h·A·ΔT
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