Effective Thermal Resistance Formula:
From: | To: |
Definition: Effective thermal resistance (θeff) is the sum of individual thermal resistances in series, representing the total resistance to heat flow.
Purpose: It helps engineers and designers calculate the overall thermal performance of multi-layer systems or components in series.
The calculator uses the formula:
Where:
Explanation: When thermal resistances are arranged in series, their values simply add up to give the total resistance.
Details: Accurate thermal resistance calculations are crucial for thermal management in electronics, building insulation, HVAC systems, and industrial processes.
Tips: Enter at least one thermal resistance value (required). You can add up to three resistances. All values must be ≥ 0.
Q1: What units are used for thermal resistance?
A: The standard unit is Kelvin per Watt (K/W), representing the temperature difference needed to transfer one watt of heat.
Q2: How does this differ from parallel resistances?
A: For parallel resistances, you would use reciprocal sums (1/θeff = Σ1/θi). This calculator is for series resistances only.
Q3: What's a typical thermal resistance value?
A: Values vary widely: from 0.1 K/W for heat sinks to 5 K/W for insulation materials, depending on thickness and conductivity.
Q4: Can I add more than three resistances?
A: For more resistances, simply add the additional values to the calculated result in subsequent calculations.
Q5: How does this relate to thermal conductivity?
A: Thermal resistance (θ) = thickness / (thermal conductivity × area). This calculator works with resistances directly.