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Air conditioning system that does not require electricity

14.09.2017

Researchers at Stanford University have developed a high-tech optical surface that creates an air conditioning system that requires almost no electrical energy to operate. Water is used as a heat carrier in this system, which passes through heat exchangers placed under the optical surface. These surfaces, due to the structure of the surface, reflect more than 97 percent of the energy of the sun's rays falling on them, while dissipating the thermal energy carried by water into the environment. And this approach allows you to drastically reduce the amount of energy required for air conditioning the interior of buildings.

Tests carried out on the "passive cooling" system have shown that the water in this system can be cooled to a temperature of 3-5 degrees Celsius below ambient temperature. Based on the collected experimental data, the Stanford researchers created a mathematical model of a refrigerated building located in a place with a dry and hot climate, similar to the climate in the Las Vegas area. Energy savings due to the use of the passive cooling system amounted to 14.3 MWh during one summer month, which corresponds to a 21 percent saving of the total amount of energy spent on air conditioning.

According to available data, cooling and air conditioning consumes about 15 percent of the electricity generated worldwide, and by 2050, the total amount of energy spent on air conditioning will increase another 10 times. Therefore, even a 20 percent energy saving will save huge amounts of money and significantly reduce the amount of greenhouse gases emitted into the atmosphere.

Researchers at Stanford University have now founded a new company called SkyCool Systems to further develop and commercialize passive cooling technology. The new system will be developed with an eye to its easy integration into existing air conditioning systems of various types and manufacturers, including data center cooling systems, where energy savings play a major role.

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