What Is the Newton's Law of Cooling & Convective Heat Transfer Calculator?
Newton's Law of Cooling was stated by Sir Isaac Newton in 1701 and forms the foundation of thermal engineering.
How Does the Newton's Law of Cooling & Convective Heat Transfer Calculator Work?
Thermal conduction through the stagnant boundary layer fluid film transfers heat into the moving turbulent fluid mainstream.
Newton's Law of Cooling & Convective Heat Transfer Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
q = h \cdot A \cdot (T_s - T_\infty), \quad R_{\text{th}} = \frac{1}{h \cdot A}
Convective heat transfer rate q equals film coefficient h times area A times temperature differential.
How to Use the Newton's Law of Cooling & Convective Heat Transfer Calculator
- Input the convective film coefficient h.
- Specify heat transfer surface area.
- Enter hot surface and cool ambient fluid temperatures.
Step-by-Step Example Calculation
Industrial Electronics Enclosure Cooling
Input Values:
heatTransferCoeffH:25.0
surfaceAreaM2:1.5
surfaceTemperatureC:85.0
ambientTemperatureC:20.0
Worked Steps: Dissipating heat from an 85°C enclosure into 20°C air (ΔT = 65°C) across 1.5 m² transfers 2437.5 W (2.44 kW) with thermal resistance R_th = 0.0267 °C/W.
Understanding Your Result
Heat Transfer Rate: Dissipated thermal power in Watts and kW.
Heat Flux: Energy transfer per square meter (W/m²).
Thermal Resistance: Convective thermal impedance in °C/W.
Factors That Affect the Result
- Fluid velocity, surface roughness, temperature gradient, and fluid thermal conductivity.
When Should You Use This Calculator?
- CPU heatsink sizing, building wall envelope cooling, EV battery thermal management, and boiler design.
Assumptions & Limitations
- Assumes uniform surface temperature and negligible radiant emissivity effects.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard thermodynamic convective formulation.