I am a Ph. D. physicist and have thought for years about this. I have never done anything about it. I see "solar refrigerators" on the internet which use solar photovoltaic cells to generate electrical power to power a compressor, but this is not what I would call a true solar refrigerator. It seems to me that one could simply take a gas refrigerator and use a solar collector to generate enough heat to power the thermal cycle. In times of clouds or night, the system could operate from a gas backup system. By using an adequately sized solar panel, the system could be run during the daytime, where the need is greatest, using only solar power. This has got to be more efficient than generating electricity and then "generating cooling" (i.e. maintaining the cooling refrigeration cycle). Solar airconditioners based on the same principle would be optimum. One needs air conditioning most when the sun is shining. This is a natural since the need is greatest when the sun is shining. To keep the system simple, gas back-up would be required. There may be a more efficient liquid that could be used at a lower temperature than is used in the gas refrigerator, but this is a refinement that could be instituted later. It seems like a home hobbyist or an engineering student could kludge together a commercial gas refrigerator with a solar focussing array and have a good demonstration system. Has anyone out there done this? John Yoder
A solar panel.
the sun.
Many car refrigerators work by getting their energy from the car's battery. Other refrigerators are solar powered or could use other energy sources but most use the energy from the car to stay cold.
Most refrigerators are powered by electricity. There are certain, specialised refrigerators that can be run on propane, natural domestic gas, or on solar power using batteries.
A working principle is a regulation or rule that is used so that work can be done. This is a general phrase that can be used in any circumstance from the working principle of a motor, to the working principle of a solar cells.
Yes. You'll need solar panels, a controller, and a battery.
Take your pick. You can use an electric fridge, powered by a generator, a wind turbine or solar power. There are also fridges that operate on kerosene or compressed gasses (Propane or Natural Gas) And if the island is big enough (think Hawaii) they have their own electrical system.
They are both luni-solar calendars, based on the lunar months with leap-adjustments to stay in step with the solar year.
The principle of solar power systems is the concept of Going Green. The concept of using a renewable resource i.e. the sun, to provide for all daily power needs, instead of using non renewable resources such as fossil fuels.
Such principle of belief that earth is the centre of the solar system is geocentrism. The model is called a Geocentric model.
a solar year
Yes. Nuclear, solar, wind, geothermal, and tidal are the principle ones.