Thermal Resistance
Thermal resistance, abbreviated as R, measures the temperature difference by which an object or material resists a heat flow.
Thermal Resistance Formula |
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\(\large{ R = \frac{ l }{ k\;A } }\) | ||
Symbol | English | Metric |
\(\large{ R }\) = thermal resistance | \(\large{\frac{hr-F}{Btu}}\) | \(\large{\frac{K}{W}}\) |
\(\large{ A }\) = area cross-section of heat exchanger | \(\large{ft^2}\) | \(\large{m^2}\) |
\(\large{ l }\) = length of material (measured on the path of the heat flow) | \(\large{ft}\) | \(\large{m}\) |
\(\large{ k }\) = thermal conductivity of material | \(\large{\frac{Btu-ft}{hr-ft^2-F}}\) | \(\large{\frac{W}{m-K}}\) |