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One way to make a fireplace more energy-efficient is to have room air circulate around the outside of the firebox and back into the room. Detail the methods of heat transfer involved.

(a) Conduction and radiation
(b) Conduction and convection
(c) Convection and radiation
(d) Conduction, convection, and radiation

Answer :

Final answer:

One way to make a fireplace more energy-efficient is to have room air circulate around the outside of the firebox and back into the room. This involves the methods of heat transfer: conduction, convection, and radiation. Option d is the correct answer.

Explanation:

In order to make a fireplace more energy-efficient, one method is to have room air circulate around the outside of the firebox and back into the room. This process involves all three methods of heat transfer: conduction, convection, and radiation.

Conduction: Heat transfer occurs through conduction into the room, but at a much slower rate. The heat is conducted through the material of the fireplace and then transferred to the surrounding air.

Convection: Heat transfer by convection occurs through cold air entering the room around windows and hot air leaving the room by rising up the chimney. In this case, the circulation of room air around the firebox allows for convection currents to form. Cold air is drawn in, heated by the firebox, and then rises, creating a continuous circulation of air.

Radiation: Most of the heat transferred into the room from the fireplace is through radiation. Radiation is the transfer of heat through electromagnetic waves. The firebox emits infrared radiation, which is absorbed by objects in the room, heating them up.

Therefore, the correct option is (d) Conduction, convection, and radiation.

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