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4 . Una pared compuesta por diferentes materiales en el centro ladrillo con una conductividad t rmica de k = 0 . 7 2

"4. Una pared compuesta por diferentes materiales en el centro ladrillo con una conductividad trmica de k=0.72 w/mk con espesor de 15 cm, se cubre por cada lado por una pelcula de concreto de 4cm de espesor de cada lado con una conductividad trmica de 1.2 w/m \deg C y finalmente se coloca dos placas de aluminio con una conductividad trmica de 237W/m-K y un espesor de 10mm, si la temperatura interior es de 24\deg C y la temperatura exterior es de -5\deg C, mide 4.5m de ancho por 3.5m de largo, los coeficientes de conductividad trmica inteior y exterior son 20 w/m^2\deg C y 50 w/m^2\deg C. Calcular la prdida de calor y las temperaturas de contacto. Nota: El arreglo de los materiales del interior al exterior son, aluminio, concreto, ladrillo, concreto y aluminio."

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