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A) There is a wall 3 m high, 3.5 m wide and 35 cm thick, made of a material whose thermal conductivity is k =

A) There is a wall 3 m high, 3.5 m wide and 35 cm thick, made of a material whose thermal conductivity is k = 0.9 W/m C, and is covered on one of its sides with a layer 1.5 cm thick of an insulating material with k = 0.08 W/m C. If one side of the wall is at 20C and the other is at 4C, determine the heat transfer by conduction through the composite wall. Select the correct answer:

image text in transcribed B) There is a wall 3 m high, 4.5 m wide and 40 cm thick, made of a material whose thermal conductivity is k = 0.9 W/m C. If one side of the wall is at 24C and the other is at 7C, determine the heat transfer by conduction through the wall. Select the correct answer:

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= Se tiene una pared de 3 m de alto, 3.5 m de ancho y 35 cm de espesor, hecha de un material cuya conductividad trmica es k = 0.9 W/m C, y est recubierta en uno de sus lados con una capa de 1.5 cm de espesor de un material aislante con k = 0.08 W/m C. Si un lado de la pared est a 20 C y el otro a 4 C, determine la transferencia de calor por conduccin a travs de la pared compuesta. Seleccione la respuesta correcta: 97 W 164 W 291 W 115 W Se tiene una pared de 3 m de alto, 4.5 m de ancho y 40 cm de espesor, hecha de un material cuya conductividad trmica es k = 0.9 W/m C. Si un lado de la pared est a 24 C y el otro a 7 C, determine la transferencia de calor por conduccin a travs de la pared. Seleccione la respuesta correcta: 327 W 621 W 452 W 516 W

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