A new technology of passive cooling operating without electricity is presented.

Researchers from the Massachusetts Technological Institute developed a new method of passive cooling, which do not require expensive materials and does not even consume electricity when working.

Technology can be used as an addition to other cooling systems or to maintain a low temperature of objects in hot places without energy. The presented development is capable of converting heat into the infrared radiation of the average range emitted to the atmosphere, preventing heating and lowering the temperature of the surrounding space. The effect is achieved by combining several layers of an inexpensive plastic film, polished aluminum, white paint and insulation.

However, according to scientists, the decisive role was placed on the metal plate device, which created a narrow shadow and prevented the contact of direct sunlight. This supplement made it possible to achieve the desired result even on the hottest days. The principle of operation of the system can be compared with the «incorrect greenhouse», which instead of accumulating heat, on the contrary gives it.

Depending on the humidity of the atmosphere, the technology allows you to cool the space by 20-40 ° C below the current ambient temperature. At the same time, the smaller the humidity, the higher the efficiency, since the water partially blocks infrared rays. The tests were carried out in Boston located near the ocean, so during tests it was possible to lower the temperature to a maximum of 20 ° C, but in the arid regions, this indicator can be increased twice.

During the experiments, the researchers were able to lower and maintain the temperature at 6 ° C. Although this is not enough for freezer, but if necessary, the system can be enhanced using conventional refrigeration or thermoelectric cooling. In itself, the use of technology will help reduce electricity costs.

However, the concept presented is not intended to cool the building. It is optimally suitable for maintaining a low temperature in small passive refrigeration chambers used for storing food products, medicines in the conditions of tropics, deserts or to prevent overheating of photoelectric systems.

Earlier we wrote about what was developed