Why solar neutrino problem is important?
The Sun is the only star close enough to the Earth for us to observe the neutrinos produced by nuclear fusion reactions. It is important to observe the abundant low-energy solar neutrinos in order to test more precisely the theory of stellar evolution.
What is the meaning of the solar constant?
Solar constant, the total radiation energy received from the Sun per unit of time per unit of area on a theoretical surface perpendicular to the Sun’s rays and at Earth’s mean distance from the Sun. The value of the constant is approximately 1.366 kilowatts per square metre.
What is the value of solar constant on Earth?
1,361 W/m2
What is aperture area in a solar collector Mcq?
2. What is aperture area in a solar collector? Explanation: Aperture area of a receiver is that area which receives the solar radiation. It need not be same as the entire size of the receiver.
When the sun is directly on the top of head it has referred to?
zenith
Which is the most efficient solar collector from following Mcq?
Which of the following provides highest energy conversion efficiency in non-concentrating solar collectors? Explanation: Evacuated flat plate collectors provide the highest energy conversion efficiency in non-concentrating solar collectors.
Which is the most efficient solar collector?
Top 10 most efficient solar panels *
| Make | Efficiency | |
|---|---|---|
| 1 | SunPower | 22.6 % |
| 2 | LG | 22.0 % |
| 3 | REC | 21.7 % |
| 4 | FuturaSun | 21.3 % |
Which is the limitation of the flat plate collector from following?
The principal disadvantage of a flat plate collector is that because of the absence of optical concentration, the area from which heat is lost is large. Also due to the same reason high temperatures cannot be attained and as a result the collection efficiency is generally low.
Which collector is used for low temperature?
Solar thermal collectors are classified as Low-, medium- or High-temperature collectors. Low temperature collectors are flat-plates generally used to heat swimming pools. Medium-temperature collectors are also usually flat-plates but are used for heating water or air for residential and commercial use.
What is meant by collector efficiency?
Solar collector efficiency. Efficiency, as stated above, is calculated by dividing the “Useful Energy Out” by the “Energy Available.” In the case of the solar heat collector, the Energy Available is the solar radiation that arrives at the collector aperture surface.
How is collector efficiency calculated?
One method is to compute the thermal efficiency of a collector, which is the ratio of the average heat output from the collector divided by the rate that solar radiation strikes the panel. I = solar radiation intensity striking the collector (Btu/hr/ft2).
What factors are used to analyze the collector performance?
The main parameters affecting the performance of solar collector are area, absorber absorptivity and emissivity, emissivity of glass cover, temperature of absorber plate, collector tilt angle and number of glass covers.
For what purpose are gas heating collectors used?
For what purpose are Gas heating collectors used? Explanation: Air or Gas heating collectors are employed as solar air heaters. Solar air heater is a type of system driving outdoor air through a sealed, sun heated collector mounted on an exterior wall or roof, returning the warmed air back to the living space.