What is the value of solar constant in calories?
Its value is about 1.98 calories per minute incident on each square centimeter (approximately 127.7 calories incident per minute on each square inch) of the upper atmosphere. The solar constant is expressed normally as watts per square meter, and its value in this unit is 1,368 w/m2.
What is the value of solar constant Mcq?
The value of the solar constant is 1.4kW/m2.
What is the SI unit of solar constant?
Appendix D: Physical Constants and Conversion Factors
| Constant | SI units |
|---|---|
| Solar constant (Hex) | 1366.1 W m−2 (instantaneous value) |
| 4.918 MJ m−2 h−1 (integrated value over 1 h) | |
| Earth’s radius (r0) | 6.37 × 106 m |
| Sun’s radius (rs) | 6.96 × 108 m |
What is a solar heating system Mcq?
This set of Solar Energy Multiple Choice Questions & Answers (MCQs) focuses on “Solar Industrial Heating Systems”. Explanation: A solar heating system is a system which uses sunlight to generate heat. This heat can either be directly used or converted to other usable forms of energy like electricity.
What affects the solar constant?
At any given moment, the amount of solar radiation received at a location on the Earth’s surface depends on the state of the atmosphere, the location’s latitude, and the time of day.
What is the solar constant of Neptune?
Bulk parameters
| Neptune | Ratio (Neptune/Earth) | |
|---|---|---|
| Solar irradiance (W/m2) | 1.508 | 0.0011 |
| Black-body temperature (K) | 46.6 | 0.183 |
| J2 (x 10-6) | 3411. | 3.151 |
| Number of natural satellites | 14 |
What is true about the solar constant?
The power of the Sun at the Earth, per square metre is called the solar constant and is approximately 1370 watts per square metre (W/m2). The solar constant actually varies by +/-3\% because of the Earth’s slightly elliptical orbit around the Sun.
What is solar heating system?
Active solar heating systems use solar energy to heat a fluid — either liquid or air — and then transfer the solar heat directly to the interior space or to a storage system for later use. If the solar system cannot provide adequate space heating, an auxiliary or back-up system provides the additional heat.
How do you calculate solar constant?
The solar constant is calculated by multiplying the sun’s surface irradiance by the square of the radius of the sun over the average distance between the Earth and the sun.
What does the solar constant tell us?
The solar constant (GSC) is a flux density measuring mean solar electromagnetic radiation (solar irradiance) per unit area. It is measured on a surface perpendicular to the rays, one astronomical unit (AU) from the Sun (roughly the distance from the Sun to the Earth).
Is solar constant actually a constant?
The solar constant is not a physical constant in the modern CODATA scientific sense; unlike the Planck constant or the speed of light which are absolutely constant in Physics. The solar constant is said to be an average of a varying value.
What is the solar constant is a measure of?
The solar constant is a measure of the power of a square meter of sunlight directly impacting on a perpendicular plane of space above the atmosphere of the Earth, and is considered to be a uniform value of 1,370 watts per square meter.