Solar-energy is not a new concept, but it's now being applied in new and innovative ways in an effort to reduce energy consumption and help save the environment. Refrigerators, for example, use up a lot of energy. Take this quiz to check your knowledge of how solar-power can fight global warming with your refrigerator.
Two billion people -- nearly a third of the global population -- do not have electricity!
Photovoltaics is another term for solar energy. Solar panels use photovoltaic cells to convert sunlight into energy.
When sunlight hits a photovoltaic cell on a solar panel the cell heats up, causing electrons to become loose and ultimately creating electricity.
NASA developed solar-powered refrigerators for the International Space Station. NASA scientists then applied the same concept on Earth and created the SunDazer, the first solar-powered refrigerator for domestic use.
A basic solar-powered refrigerator uses the traditional method of vapor-compression for cooling.
A basic solar-powered refrigerator reaches the same cooling temperature as a traditional refrigerator: 38 degrees Fahrenheit.
To maintain a cooling temperature of 38 degrees Fahrenheit, a solar-powered refrigerator requires five hours of sunlight per day.
A basic solar-powered refrigerator has two backups if it does not get enough sunlight. It has supplementary battery power and it can also store sunlight power for up to a week.
A British student named Emily Cummins invented a refrigerator with no moving parts, called the “eco-fridge." It uses an evaporative-cooling system for energy.
Impoverished people of third-world countries can truly benefit from such a refrigerator for keeping essential medication refrigerated. Such a refrigerator requires no electricity and is not as expensive as solar-paneled refrigerators.
Cummins's eco-fridge can remain at 43 degrees Fahrenheit for several days.
The eco-fridge requires a lot of sunlight and heat. Hot climate countries, such as Namibia, can truly benefit from this system.
This refrigeration system has no backup. It relies solely on sunlight to keep items cold.
In the past decade, green-conscious individuals have replaced their regular refrigerators with solar-powered ones.
Solar energy provides electricity for many household needs, including charging cell phones. Solar energy is also used to power the International Space Station.
Your refrigerator will run 25% better if it is set between 38 and 42 degrees Fahrenheit.
You can buy a refrigerator alarm, which rings every time your refrigerator is left open for too long.
Many people can benefit from solar-powered refrigeration, including street vendors, scientific study outposts, people in third-world countries, remote camping sites and eco-resorts.
The eco-fridge, which operates on an evaporative cooling system, requires the sun's heat and some water to function.
The eco-fridge is comprised of two cylinders, one inside the other. The outer cylinder can actually be made up of almost anything, including cardboard!