The wall of a cold-storage chamber is made of brick thick with an interior surface area of

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

The wall of a cold-storage chamber is made of brick 24 cm24\,\text{cm} thick with an interior surface area of 10 m210\,\text{m}^2. The inside temperature is maintained at 5 ∘C5\,^{\circ}\text{C} while the outside temperature is 35 ∘C35\,^{\circ}\text{C}. The thermal conductivity of brick is 0.60 W m−1 K−10.60\,\text{W}\,\text{m}^{-1}\,\text{K}^{-1}. (a) Calculate the rate at which heat enters the cold room through the wall. (b) How much thermal energy (in kWh) will leak into the room in a period of 8 h8\,\text{h} if the conditions remain unchanged?

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