EngiRef / Thermodynamics Engineering Formula
Newton's Law of Cooling
Newton's Law of Cooling: Heat transfer by convection. A Heat Transfer formula in thermodynamics engineering. Variables Q, h, A, Tₛ and T∞, each with SI and…
Heat Transfer
Specification
- Name
- Newton's Law of Cooling
- Discipline
- thermodynamics
- Category
- Heat Transfer
- LaTeX
- Q = hA(T_s - T_\infty)
- Description
- Heat transfer by convection
- Conditions
- Convection coefficient h assumed constant
- Can solve for
- Q, h, A
- Tags
- convection, newton, cooling, heat transfer
Variables
| Symbol | Name | Unit | Si Unit | Imperial Unit |
|---|---|---|---|---|
| Q | Heat Transfer Rate | W | W | BTU/hr |
| h | Convection Coefficient | W/(m²·K) | W/(m²·K) | BTU/(hr·ft²·°F) |
| A | Surface Area | m² | m² | ft² |
| Tₛ | Surface Temperature | K | K | °F |
| T∞ | Fluid Temperature | K | K | °F |
Common questions
- What is the Newton's Law of Cooling formula?
- Heat transfer by convection. It sits under Heat Transfer, Thermo engineering in the EngiRef reference.
- What do the symbols in the Newton's Law of Cooling formula mean?
- In Newton's Law of Cooling, Q is heat transfer rate in W; h is convection coefficient in W/(m²·K); A is surface area in m²; Tₛ is surface temperature in K; T∞ is fluid temperature in K.
- When does the Newton's Law of Cooling formula apply?
- Newton's Law of Cooling holds under this condition: Convection coefficient h assumed constant.