Phát âm chuẩn cùng VOA – Anh ngữ đặc biệt: Sending Heat Into Space (VOA)

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Researchers at Stanford University have developed a new material that can move heat out of buildings and into space. The researchers say the material can cool buildings even on hot days. The cooling material is a very thin sheet with many layers that can be placed on a roof like solar panels. However, instead of turning sunlight into energy as solar panels do, the material turns heat into infrared radiation. Shanhui Fan is an electrical engineering professor at Stanford University. He says that the panels have a layer of material that is like sand. He says that the panels act like a mirror. They take heat out of buildings and reflect the light from the sun. He says both the heat and sunlight are sent 100 kilometers into outer space. The panels are cool to the touch, even in the sun. Researchers say they can reduce the indoor temperature to nearly 5 degrees Celsius below the temperature outside. Mr. Fan says buildings in developing countries that do not have electricity or air conditioning could use the panels. The Stanford researchers described their technology in the science publication Nature. They say the main problem is creating actual cooling systems using the high-tech panels. They say it may be possible to develop a cooling spray that could be used on existing solid structures. The researchers believe the cooling spray technology could be developed in the next three to five years. They say as much as 15 percent of the energy used in the United States is spent providing power to air conditioning systems.

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