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Question about Heat Exchanges: Advanced

Physics

Originais Teachy

Heat Exchanges: Advanced

Medium

(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.

Answer:

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