The interior of a refrigeration has inside dimensions 60 cm × 45 cm base area and120 cm high. The composite wall is made of two 3 mm mild steel sheets (k = 145 kJ/mhr-deg) with 6cm of glass wool (k = 0.188 kJ/m-hr-deg) insulation sandwiched between them. The average values of convective heat transfer coefficients at the interior and exterior wall are 40.8 and 52.3 kJ/m2-hr-deg respectively. (a) For the air temperature inside the refrigerator at 6.50C and outside of 250C, determine the rate at which heat must be removed from the refrigerator. Also, calculate the temperature on the outer surface of the metal sheet.

Elements Of Electromagnetics
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The interior of a refrigeration has inside dimensions 60 cm × 45 cm base area and120 cm high. The composite wall is made of two 3 mm mild steel sheets (k = 145 kJ/mhr-deg) with 6cm of glass wool (k = 0.188 kJ/m-hr-deg) insulation sandwiched between them. The average values of convective heat transfer coefficients at the interior and exterior wall are 40.8 and 52.3 kJ/m2-hr-deg respectively.


(a) For the air temperature inside the refrigerator at 6.50C and outside of 250C, determine the rate at which heat must be removed from the refrigerator. Also, calculate the temperature on the outer surface of the metal sheet.

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