【Daily Topic】【HVAC Version 20170414】
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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: What does \"thermal conductivity\" refer to, under steady-state conditions, in which of the following situations is the heat transferred through an area of 1 m2 over a distance of 1 l? ( ) A. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the air on both sides. B. There is a temperature difference of 1℃ between the inner and outer surfaces of the building envelope. C. There is a temperature difference of 1℃ between the air on both sides of the building envelope. D. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the surfaces on both sides. D
“The \"thermal conductivity\" refers to the amount of heat transferred through an area of 1 m2 in a period of lh by thermal conduction, under steady-state conditions. Which of the following situations applies? (D) A. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the air on both sides. B. There is a temperature difference of 1℃ between the inner and outer surfaces of the enclosure. C. There is a temperature difference of 1℃ between the air on both sides of the enclosure. D. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the surfaces on both sides℃
D. The thickness of the material layer is 1 m, and the temperature difference between the two surfaces is 1℃
Choose D. Explanation: The thermal conductivity refers to the amount of heat transferred by conduction through an area of 1 m2 in 1 hour, under steady-state conditions, when the thickness of the material layer is 1 m and the temperature difference between the two surfaces of the material layer is 1°C.
“The \"thermal conductivity\" refers to the amount of heat transferred through an area of 1 m2 in a period of lh by thermal conduction, under steady-state conditions. (D) A. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the two sides. B. The temperature difference between the inner and outer surfaces of the enclosure is 1℃. C. The temperature difference between the air on both sides of the enclosure is 1℃. D. The thickness of the material layer is 1 m, with a temperature difference of 1℃ between the two surfaces℃