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  • Deprecated function: The each() function is deprecated. This message will be suppressed on further calls en menu_set_active_trail() (línea 2394 de /home1/montes/public_html/drupal/includes/menu.inc).
  • Deprecated function: The each() function is deprecated. This message will be suppressed on further calls en book_prev() (línea 775 de /home1/montes/public_html/drupal/modules/book/book.module).
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  • Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters en drupal_get_feeds() (línea 394 de /home1/montes/public_html/drupal/includes/common.inc).

Cuestion 4 S.POTENCIA 2014 Sept 1 S1 (Conveccion natural, radiacion)

Solapas principales

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Resolucion:

Para calcular la resistencia termica total de la placa de aluminio tenemos que calcular la potencia calorifica transmitida por cada lado de la placa provocada por la conveccion y por la radiacion.
 
La potencia calorifica por radiacion vendra dada por:
 
P_{rad}=A\cdot ff\cdot e\cdot \sigma\cdot  (T^4_{cond}-T^4_{amb})
 
A es el area.
ff es factor de forma.
e es la emitividad
Tcond es la temperatura en la placa
Tamb es la temperatura ambiente
 
La potencia calorifica por conveccion natural de cada lado de la placa vendra dada por:
P_{conv}=h_{c}\cdot A\cdot (T_{cond}-T_{amb})
 
Como la placa esta en vertical y la altura es menor que 0.6m el coeficiente de transmision superficial por conveccion natural viene dado por:
 
h_{c}=1.34\cdot \left(\frac{T_{cond}-T_{amb}}{altura}\right)^{0.25}=
=1.34\cdot \left(\frac{T_{cond}-T_{amb}}{0.5}\right)^{0.25}=4,23
 
 
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