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{R_{T}}\ = {R_{si} + \frac{d_1}{\lambda_1} + \frac{d_2}{\lambda_2} + \dots \frac{d_{n}}{\lambda_{n}}+ R_{se}} | {R_{T}}\ = {R_{si} + \frac{d_1}{\lambda_1} + \frac{d_2}{\lambda_2} + \dots \frac{d_{n}}{\lambda_{n}}+ R_{se}} | ||
</math> | </math> | ||
der Kehrwert bildet den '''U-Wert''': | der Kehrwert bildet den '''U-Wert''': | ||
:<math> U\quad = \frac{1}{R_{T}} </math> [W/(m²·K)] | :<math> U\quad = \frac{1}{R_{T}} </math> [W/(m²·K)] |