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Hoffman Equation:
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The Hoffman equation calculates the temperature rise in an enclosure due to heat dissipation from electronic components or other heat sources. It is commonly used in thermal management and enclosure design for electrical equipment.
The calculator uses the Hoffman equation:
Where:
Explanation: The equation calculates the temperature difference between the enclosure interior and ambient environment based on heat generation and dissipation characteristics.
Details: Accurate temperature rise calculation is crucial for ensuring electronic components operate within safe temperature limits, preventing overheating, and designing proper cooling systems.
Tips: Enter heat dissipation in watts, heat transfer coefficient in W/m²K, and surface area in square meters. All values must be positive numbers greater than zero.
Q1: What is a typical heat transfer coefficient value?
A: For natural convection in air, typical values range from 5-25 W/m²K. For forced convection, values can range from 10-200 W/m²K depending on airflow.
Q2: How do I determine the surface area?
A: Calculate the total external surface area of the enclosure that participates in heat transfer, excluding any surfaces that are insulated or not exposed to air.
Q3: What is considered an acceptable temperature rise?
A: This depends on the application and components. Generally, temperature rises above 40°C may require additional cooling measures for electronic equipment.
Q4: Does this equation account for radiation heat transfer?
A: The basic Hoffman equation primarily addresses convection. For more accurate results, radiation effects may need to be considered separately in high-temperature applications.
Q5: When should I use this calculation?
A: Use this for preliminary thermal analysis of enclosures containing heat-generating components, such as electrical cabinets, control panels, and electronic housings.