Radiation Heat Transfer Formula:
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Definition: This calculator computes the thermal radiation heat transfer between two surfaces using the Stefan-Boltzmann law.
Purpose: It helps engineers, physicists, and students calculate radiant heat exchange for thermal analysis and system design.
The calculator uses the formula:
Where:
Explanation: The formula calculates the net radiant heat transfer between two surfaces based on their temperatures and material properties.
Details: Accurate calculation is crucial for thermal management in systems ranging from electronics cooling to building design and spacecraft thermal control.
Tips: Enter all required values in appropriate units. Default values are provided for the Stefan-Boltzmann constant (5.67×10⁻⁸) and typical emissivity (0.9).
Q1: What is the Stefan-Boltzmann constant?
A: A physical constant (5.67×10⁻⁸ W/m²·K⁴) that describes how much power is radiated from a black body at a given temperature.
Q2: What is emissivity?
A: A dimensionless measure (0-1) of how efficiently a surface emits thermal radiation compared to an ideal black body.
Q3: Why are temperatures in Kelvin?
A: The Stefan-Boltzmann law requires absolute temperature values. Remember: K = °C + 273.15.
Q4: What if T₂ > T₁?
A: The calculator will show a negative value, indicating heat transfer is in the opposite direction.
Q5: Does this account for view factors?
A: No, this is for direct radiation between parallel surfaces. For complex geometries, view factors must be considered separately.