题目内容

What is the most important heat transfer mechanism in domestic solar water heating systems?

A. Conduction
B. Convection
C. Radiation
D. All of them are equally important

查看答案

搜索结果不匹配？点我反馈

更多问题

Knowing that the radius of the Sun is \(6.9610^8 m\) and the distance between the Sun and the Earth is roughly \(1.5010^{11}m\), and assuming that the Sun is a perfect sphere, calculate the temperature in \(K\) at the Sun's surface. Assume that the irradiance arriving to the Earth is the value for AM0: \(1350W/m^2\). ______

查看答案

During the winter, the inside of an average house is maintained at 20 ºC, while the outside temperature is 0 ºC. Assuming that the only mechanism of heat transfer is conduction, the walls are 10 cm thick and the heat conductivity of the walls is \(0.5 W/Km\). Calculate the heat flux from the room to the surroundings in \(W/m^2\).We decide that, to reduce the heat loss through the walls, the material should be changed to an insulator material. The new overall conductivity will be \(0.1 W/Km\), and the thickness of the wall is maintained. Calculate the reduction of the heat flux throughout the walls in % compared to the initial case. ______

查看答案

The figure below shows the band diagram of a tandem cell based on an amorphous and a microcrystalline silicon junction. In which position (A, B, C or D) are the electrons and holes, generated in the microcrystalline silicon junction, collected?

A. The holes are not collected at position A, B, C and D, but recombine with a light excited electron from the top cell at the recombination junction. The electrons are collected at
B. The holes are collected at D and the electrons at
C. The holes are collected at C and the electrons at
D. The holes are collected at D and the electrons at A, B, C or

查看答案

Consider a p-i-n a-Si:H solar cell. The various films are, from top to bottom: ZnO, a-Si:H (p-i-n), ZnO and Ag. Which deposition technologies and in which chronological order (from first processing step to the last processing step) are used to process the solar cell?

查看答案

What is the most important heat transfer mechanism in domestic solar water heating systems?

A. Conduction B. Convection C. Radiation D. All of them are equally important

The figure below shows the band diagram of a tandem cell based on an amorphous and a microcrystalline silicon junction. In which position (A, B, C or D) are the electrons and holes, generated in the microcrystalline silicon junction, collected?

Consider a p-i-n a-Si:H solar cell. The various films are, from top to bottom: ZnO, a-Si:H (p-i-n), ZnO and Ag. Which deposition technologies and in which chronological order (from first processing step to the last processing step) are used to process the solar cell?

A. Conduction
B. Convection
C. Radiation
D. All of them are equally important