Stanford invented a fully passive air conditioner
A team of scientists from Stanford University has developed a composite material based on quartz and silicon carbide, which is able to almost completely reflect sunlight and at the same time emit well infrared waves in the so-called " windows of transparency " of the atmosphere - in which atmospheric gases and water vapor are almost transparent to thermal radiation. Panels of this material, located on the roof of a building or car, are capable of dissipating about 100 watts of heat per square meter of surface on a sunny day. On the basis of this material, air-conditioning and cooling systems can be created with zero electricity consumption and the complete absence of moving parts.
If earlier radiation-cooling systems were effective mainly at night, and only with low air humidity and a clear sky, the new material retains the ability to radiate heat in a wide range of atmospheric conditions.
According to the researchers, if you cover only 10% of the roof of a residential house with such panels, it will reduce the consumption of electricity for air conditioning in the summer by 35%. Such passive air conditioners can be used in industrial buildings, data centers and offices, as well as in remote areas with a shortage of electricity. If their cost in mass production is low enough, they can be a real salvation for the third world countries.
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In addition, such radiators will help fight the greenhouse effect on a global scale. If heating energy costs are constantly falling due to modern heat-insulating materials and energy-saving technologies in rich northern countries, with air conditioning everything is the other way around - the need for it is felt much stronger in developing countries, mainly located in a hot climate. Rapid economic growth entails a sharp increase in energy costs for air conditioning. So, in Mumbai, up to 40% of electricity is spent on cooling. According to some estimates, Saudi Arabia in 15 years will burn more oil than it exports, largely due to the cost of energy for air conditioning.
If earlier radiation-cooling systems were effective mainly at night, and only with low air humidity and a clear sky, the new material retains the ability to radiate heat in a wide range of atmospheric conditions.
According to the researchers, if you cover only 10% of the roof of a residential house with such panels, it will reduce the consumption of electricity for air conditioning in the summer by 35%. Such passive air conditioners can be used in industrial buildings, data centers and offices, as well as in remote areas with a shortage of electricity. If their cost in mass production is low enough, they can be a real salvation for the third world countries.
')
In addition, such radiators will help fight the greenhouse effect on a global scale. If heating energy costs are constantly falling due to modern heat-insulating materials and energy-saving technologies in rich northern countries, with air conditioning everything is the other way around - the need for it is felt much stronger in developing countries, mainly located in a hot climate. Rapid economic growth entails a sharp increase in energy costs for air conditioning. So, in Mumbai, up to 40% of electricity is spent on cooling. According to some estimates, Saudi Arabia in 15 years will burn more oil than it exports, largely due to the cost of energy for air conditioning.
Source: https://habr.com/ru/post/176857/
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