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Los filetes de pescado estn originalmente a 10C y se envasan con un espesor de 102 mm con hielo en cada lado. Suponiendo que la

  1. Los filetes de pescado estn originalmente a 10C y se envasan con un espesor de 102 mm con hielo en cada lado.
  1. Suponiendo que la temperatura de la superficie de los filetes es de 0 C, calcule el tiempo para que la temperatura promedio alcance los 1,39 C. Nota: Este es un caso donde la resistencia superficial es cero. Propiedades fsicas de los filetes de pescado: k = 0,571 W/mK, = 1052 kg/m 3 , c p = 4,02 kJ/kg.K.
  2. Suponga que se utiliza un congelador de placas o de contacto donde el coeficiente de superficie puede tomarse como h = 142 W/m 2 .K.

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