The solar energy reaching unit area at outer edge of the Earth’s atmosphere exposed perpendicularly to the rays of the Sun at the average distance between the Sun and Earth is known as the solar constant. Solar Constant = 1.4kW/m2. Q.
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What is solar constant and its value?
The constant of solar energy is the total radiation energy received from the Sun per unit of time per unit of area on a theoretical surface directed perpendicular to the Sun’s rays and at Earth’s implying the distance from the Sun. The value of the constant is said to be approximately 1.366 kilowatts per square meter.
What is solar radiation and solar constant?
Above the earth’s atmosphere, solar radiation has an intensity of approximately 1380 watts per square meter (W/m2). This value is known as the Solar Constant. At our latitude, the value at the surface is approximately 1000 W/m2 on a clear day at solar noon in the summer months.
What is the unit of 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).
What is solar constant PDF?
The amount of sunshine. intercepted by the earth per second per unit area is called. the solar constant [1, 4, 5] and its value is distributed. among the various wavelength regions very much like the.
Why is solar constant divided 4?
We divide by 4 since the solar energy is spread over the surface of the planetary sphere. The Earth intercepts a circular area of incoming sunlight, and this area is spread over a sphere with the same radius as the circle (area of circle / area of sphere of same radius = 0.25).
Is solar constant important?
Knowledge of the exact value of the solar constant is very important for the study of heat-exchange processes in the earth’s atmosphere and for the investigation of processes occurring in the sun.
What is solar constant what is its value Class 10?
The solar constant is the measurement of the total radiation from the sun per unit of time per unit of area. The estimated value of the solar constant is around 1.36 kilowatts per square meter. Therefore its unit is Watt per square meter.
What is the unit of solar radiation?
Radiation data for solar electric (photovoltaic) systems are often represented as kilowatt-hours per square meter (kWh/m2). Direct estimates of solar energy may also be expressed as watts per square meter (W/m2).
What is meant by solar radiation?
Solar radiation is the energy emitted by the Sun, which is sent in all directions through space as electromagnetic waves. Emitted by the surface of the Sun, this energy influences atmospheric and climatological processes.
What means irradiance?
Irradiance is defined as the energy per unit time that strikes a unit horizontal area per unit wavelength interval, where the typical unit is W mโ2 nmโ1.
What is the SI unit of the solar constant Mcq?
The value of solar constant in SI system is 1340mwatt.
Is the sun a constant?
From our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky. But the Sun is a dynamic star, constantly changing and sending energy out into space.
What is the solar constant value Mcq?
Explanation: The energy received from the sun can be distributed all over the surface of earth and by doing this an average incident flux density can be established. It is determined as solar constant, having a value of 1367 W / m2 .
What is local solar time?
“Local solar time” (or simply “solar time”) is the time according to the position of the sun in the sky relative to one specific location on the ground. In solar time, the sun is always due south (or north) at exactly noon.
What is the hour angle?
The hour angle is the angular displacement of the sun east or west of the local meridian due to rotation of the earth on its axis at 15ยฐ per hour with morning being negative and afternoon being positive. For example, at 10:30 a.m. local apparent time the hour angle is โ22.5ยฐ (15ยฐ per hour times 1.5 hours before noon).
What are 4 types of radiation from the sun?
Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat. To “radiate” means to send out or spread from a central location.
How do you calculate albedo?
Albedo can be measured using satellite imagery or a pyranometer device, which detects shortwave solar radiation in the form of watts per square meter (W/sq m). Simply, albedo can be calculated using the basic equation Albedo = Reflected Light/Incoming Light. Albedo affects global climate and weather patterns.
How is solar flux measured?
A pyranometer is a device used for measuring solar irradiance on a planar surface by measuring the solar radiation flux density ( in units of W/m2) from the above hemisphere within a range of wavelength from 0.3 ฮผm to 3 ฮผm. The name pyranometer originates from the Greek words meaning fire, and above sky.
How is Sun intensity calculated?
Solar insolation (I) can be calculated using the following formula: I = S cosZ.
Where is the subsolar point?
The subsolar point describes the latitude where the sun’s rays hit the Earth exactly perpendicular to the Earth’s surface. It is where the sun appears directly overhead at noon.
What is the solar constant for Mars?
The solar irradiance (solar constant) of Mars is 590 W/m^2 on average.
Which planet is red planet?
Mars is known as the Red Planet. It is red because the soil looks like rusty iron. Mars has two small moons.
What is the smallest planet name?
Mercury is the smallest planet in our solar system. It’s a little bigger than Earth’s Moon. It is the closest planet to the Sun, but it’s actually not the hottest. Venus is hotter.
What is the principle of solar system?
Based on the principle of photovoltaic effect, solar cells or photovoltaic cells are made. They convert sunlight into direct current (DC) electricity. But, a single photovoltaic cell does not produce enough amount of electricity.