Question about Heat Exchanges: Advanced


Originais Teachy

Heat Exchanges: Advanced


(Originais Teachy 2023) - Question Medium of Physics

An engineer is working on a project to improve the energy efficiency of a house by reducing heat loss through the walls during winter. The wall is 10 m long, 2.5 m high, and 0.3 m thick, and is made of bricks with a thermal conductivity (k) of 0.6 W/(m·K). Inside the house, the temperature is maintained at 22°C, while the external temperature reaches 5°C. (a) Determine the heat flow through the wall. (b) Using the results from part (a), the engineer decides to add an insulation layer with a thermal conductivity (k) of 0.04 W/(m·K) and a thickness of 0.05 m, calculate the new heat flow after this addition. (c) Based on the two situations presented, calculate the percentage reduction in heat flow achieved by the engineer.


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