Four Principles Of Solar Cooker

2.4 Principles of Solar Cooker

Naturally, earth has its own energy budget that hits the surface of earth and reflected back to the atmosphere. Figure 2.0.6 show the amount and percentage of earth’s energy budget. Figure 2.4.1: Earth’s Energy Budget

In this project, we use three principles which are focusing sunlight to evacuated tube, converting light energy to heat energy and trapping heat energy.

1. Focusing sunlight to evacuated tube: A reflected surface with high specular reflectivity is utilized to focus light from the sun onto a small cooking region. Contingent upon the geometry of the surface, sunlight can be concentrated by a few requests of size creating temperatures sufficiently high to dissolve salt and noticed metal. For most household solar cooking applications, such high temperatures are not really required. Solar cooking items, along these lines, are ordinarily intended to accomplish temperatures of 150 °F (65 °C) (preparing temperatures) to 750 °F (400 °C) (flame broiling/singing temperatures) on a sunny day

2. Converting light energy to heat energy: Solar cooker will concentrate sunlight onto the evacuated tube. The interaction between the

Convection occurs when warmer areas of a liquid or gas ascend to cooler areas in the liquid or gas. Cooler liquid or gas then takes the place of the warmer areas which have risen higher. The fluid above a hot surface expands, becomes less dense and rises. This results in a continuous circulation pattern. At the molecular level, the molecules expand upon introduction of thermal energy. As temperature of the given fluid mass increases, the volume of the liquid must increment by same variable. This impact on the liquid cause dislodging as the quick hot air rises, it pushes denser and colder air down. This is happened in this parabolic solar cooker. Figure 2.0.8 shows place where convection application occurs in this solar