5. 5 Solar radiation
The sun is the largest energy source in our system; we get an equivalent temperature of
5700 K. if we calculate its temperature from its radiation, as shown in Fig. 5.5. The direct
Solar radiation received at a flat surface of unit area (normal to the radiation beam) just
outside the atmosphere of the earth is called the solar constant (JOW). it varies, of course,
at it is a kind of indicator of the energy that reaches the earth, based on observations over
many years. It in reported that the average value is 1,360 W/m*m. When solar radiation
passes through the atmosphere: around the earth, some parts of it are absorbed, and others
are reflected (see Fig. 4.2). The solar radiation received on the earth: surface, therefore,
consists of directional and non-directional radiation -- that is, direct and diffuse radiation.
Direct radiation is that which comes from the sun directly, and diffuse is that which is
reflected in the atmosphere and comes from all directions of the sky. Hemispherical,
radiation and horizontal surface is given as the sum of two components, RAD and RADS,
where RAD is direct radiation (w/m*m) and RADS is diffuse radiation (W/m)(see Fig. 5.6).
5. 5 Solar radiationThe sun is the largest energy source in our system; we get an equivalent temperature of5700 K. if we calculate its temperature from its radiation, as shown in Fig. 5.5. The directSolar radiation received at a flat surface of unit area (normal to the radiation beam) justoutside the atmosphere of the earth is called the solar constant (JOW). it varies, of course,at it is a kind of indicator of the energy that reaches the earth, based on observations overmany years. It in reported that the average value is 1,360 W/m*m. When solar radiationpasses through the atmosphere: around the earth, some parts of it are absorbed, and othersare reflected (see Fig. 4.2). The solar radiation received on the earth: surface, therefore,consists of directional and non-directional radiation -- that is, direct and diffuse radiation.Direct radiation is that which comes from the sun directly, and diffuse is that which isreflected in the atmosphere and comes from all directions of the sky. Hemispherical,radiation and horizontal surface is given as the sum of two components, RAD and RADS,where RAD is direct radiation (w/m*m) and RADS is diffuse radiation (W/m)(see Fig. 5.6).
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