Question

Which of these changes will increase the energy loss of a building?

A. A decrease in the temperature of the outside of the building.
B. An increase in the R-value for the insulation materials used in the building
C. A decrease in the energy flux (W/m^2) of the building.
D. An increase in temperature difference between the inside and outside of the building.

Answer 1

1. The velocity decreases, and the kinetic energy decreases.

2. An increase in temperature difference between the inside and outside of the building.

3. The total kinetic energy remains the same.

4. 76,761 J

5. The energy loss must increase.

Answer 2

Temperature difference between the inside and outside of the building will increase the thermal flow. Option D is correct.

R- Value:

It is the measure of the efficiency of the material to resist the heat flow.  Higher the R-value, better will be insulation. It is between 1.5-7.

As  heat tend to move from higher temperature to lower temperature, when difference of temperature greater.

Therefore, temperature difference between the inside and outside of the building will increase the thermal flow.

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