1. What is an Electrical Enclosure Thermal Calculator?

Definition: This calculator estimates the temperature rise inside an electrical enclosure based on heat dissipation, enclosure surface area, and heat transfer coefficient.

Purpose: It helps electrical engineers and designers ensure components stay within safe operating temperatures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \Delta T \) — Temperature rise (Kelvin)
• \( Q \) — Heat dissipation (Watts)
• \( h \) — Heat transfer coefficient (W/m²·K)
• \( A \) — Enclosure surface area (m²)

Explanation: The heat generated is divided by the product of heat transfer coefficient and surface area to determine temperature rise.

3. Importance of Thermal Calculation

Details: Proper thermal management prevents overheating, ensures component reliability, and maintains system performance.

4. Using the Calculator

Tips: Enter the total heat dissipation in Watts, heat transfer coefficient (default 5.5 W/m²·K for natural convection), and enclosure surface area in m².

5. Frequently Asked Questions (FAQ)

Q1: What's a typical heat transfer coefficient?
A: For natural convection, typical values range from 5-10 W/m²·K. For forced air cooling, it can be 10-100 W/m²·K.

Q2: How do I measure enclosure surface area?
A: Calculate the total external surface area including all sides (2×(L×W + L×H + W×H) for rectangular enclosures).

Q3: What's a safe temperature rise?
A: Typically keep ΔT below 10-15K for most electrical components, but check manufacturer specifications.

Q4: How do I reduce temperature rise?
A: Increase surface area, improve heat transfer (fans, heat sinks), or reduce heat generation.

Q5: Does this account for solar radiation?
A: No, for outdoor enclosures, add solar load to the heat dissipation (Q) value.