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有效热阻计算器

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有效热阻计算器
图层1
结果:
Total Effective Thermal Resistance:

- 有效热阻计算器 helps you determine how well a structure or material system resists the of . This tool is especially important in thermal engineering, insulation design, building construction, and electronics cooling.

When a wall, device, or system has multiple layers—each made of different materials—the calculator combines their individual thermal resistances into one total value. This 总阻力 tells you how effective the entire system is at resisting heat flow.

This tool is categorized under thermal and insulation performance calculators and is used in both engineering and real-world design applications.

公式

For Layers in Series (Heat Flow Perpendicular to Layers):

有效热阻

地点:

  • R_总 = Total Effective Thermal Resistance (units: m²·K/W, ft²·°F·hr/Btu, or similar)
  • R_i = Thermal Resistance of the i-th layer or component
  • R_i is calculated as: R_i = L_i / (k_i * A_i)

和:

  • = Thickness of the i-th layer (units: m, ft)
  • _ = Thermal Conductivity of the material in the i-th layer (units: W/m·K, Btu/hr·ft·°F)
  • 人工智能 = Area of the i-th layer perpendicular to heat flow (units: m², ft²)

备注:如果 人工智能 is the same across all layers, it can be factored out. In such cases, thermal resistance is often calculated per unit area.

This formula is used for systems where heat flows perpendicular to the surfaces of each material layer (common in walls, roofs, and multi-layer boards).

快速参考通用术语表

按揭年数描述常见用例
R_总Total thermal resistance of all layers combinedUsed in thermal modeling
R_iThermal resistance of a single layerLayer-specific performance
Thickness of a material layerInsulation, wall thickness
_Thermal conductivity of the materialDescribes material’s ability to conduct heat
人工智能Surface area through which heat flowsRequired when areas differ across layers
平方米·千瓦/瓦SI unit for thermal resistanceMetric building applications
ft²·°F·hr/BtuImperial unit for thermal resistanceU.S. building insulation ratings

例如:

Let’s calculate the total thermal resistance of a wall made of three layers:

  1. 图层1:
    • 材质:砖
    • Thickness (L_1) = 0.1 m
    • Thermal conductivity (k_1) = 0.6 W/m·K
    • Area (A_1) = 10 m²
  2. 图层2:
    • Material: Insulation foam
    • Thickness (L_2) = 0.05 m
    • Thermal conductivity (k_2) = 0.03 W/m·K
    • Area (A_2) = 10 m²
  3. 图层3:
    • Material: Wood panel
    • Thickness (L_3) = 0.02 m
    • Thermal conductivity (k_3) = 0.12 W/m·K
    • Area (A_3) = 10 m²

第一步: Calculate R_i for each layer
R_1 = 0.1 / (0.6 × 10) = 0.0167 m²·K/W
R_2 = 0.05 / (0.03 × 10) = 0.1667 m²·K/W
R_3 = 0.02 / (0.12 × 10) = 0.0167 m²·K/W

第一步: Add all R values
R_total = 0.0167 + 0.1667 + 0.0167 = 0.2 平方米·千瓦/瓦

回答: The total thermal resistance is 0.2 平方米·千瓦/瓦

最常见的常见问题解答

什么是热阻?

Thermal resistance is a measure of how well a material or combination of materials resists the flow of heat. Higher values mean better insulation and slower heat transfer.

How do I know if I need to calculate effective thermal resistance?

You need to calculate it when dealing with walls, ceilings, electronic devices, or any structure made of different materials. It helps determine how much heat will pass through and whether more insulation is need.

Is thermal resistance the same as R-value?

Yes, in building construction, R值 is a term commonly use to refer to thermal resistance. It shows how well a material insulates and is usually given per unit area.

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