Heat Sink Thermal Resistance Calculator

Thermal Resistance Formula:

\[ θ = \frac{ΔT}{Q} \]

Thermal Resistance (θ): K/W

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1. What is a Heat Sink Thermal Resistance Calculator?

Definition: This calculator determines the thermal resistance of a heat sink based on temperature difference and heat flow.

Purpose: It helps engineers and designers evaluate heat sink performance in thermal management systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ θ = \frac{ΔT}{Q} \]

Where:

\( θ \) — Thermal resistance (K/W)
\( ΔT \) — Temperature difference (K)
\( Q \) — Heat flow (W)

Explanation: The temperature difference across the heat sink is divided by the heat flow to determine its thermal resistance.

3. Importance of Thermal Resistance Calculation

Details: Proper thermal resistance estimation ensures effective heat dissipation, prevents overheating, and maintains electronic component reliability.

4. Using the Calculator

Tips: Enter the temperature difference in Kelvin and heat flow in Watts. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a good thermal resistance value?
A: Lower values are better (typically 0.1-10 K/W). The ideal value depends on the application and heat generation.

Q2: How do I measure temperature difference?
A: Measure temperature at heat source and ambient, then subtract (ΔT = T_source - T_ambient).

Q3: What affects heat sink thermal resistance?
A: Material, surface area, airflow, contact quality, and fin design all impact thermal resistance.

Q4: Can I use °C instead of K?
A: Yes, since ΔT in °C equals ΔT in K (the scales have equal magnitude increments).

Q5: What's typical heat flow for electronics?
A: CPUs: 50-150W, GPUs: 100-300W, LEDs: 1-10W, power transistors: 1-50W.