Cooling the wood can function as a heat sink. It absorbs warm inside of the room (space) and radiates it outside. The material is on average 5-6 °C was colder than the outside air in the room even in the hottest time of the day.
Wood, able to cool the room for 5-6 OS:
Scientists have created wood that is capable of cooling the room by 5-6 °C.
It is known that any wood is composed of fibers of cellulose, lignin and hemicellulose. Lignin (from the Latin. lignum – wood, timber) is the substance that characterizes lignified plant cell walls, and which is a mixture of aromatic polymers of related structure. In wood lignin performs the function of a binder between the cellulose fibers.
Lignin has the property to absorb UV light and convert it to thermal fluctuations and near-infrared radiation (i.e. infrared radiation with a wavelength of the order of 0.74-2.5 µm).
To obtain the cooling of the wood , the researchers were removed from the wood the whole lignin. To this end, they treated the wood of lime with a solution of hydrogen peroxide, which grinds long molecules of lignin into small fragments. Lignin is washed from the wood, and the remaining cellulose compressed. As a result, scientists got the bright white durable material, the strength of which is 8-10 times the strength of normal wood.
It turned out that the new material is able to function as a heat sink. It absorbs the heat inside the room (space) and radiates it outside. The material is on average 5-6 °C was colder than the outside air in the room even in the hottest time of the day. On the other hand, because of its white color material practically does not absorb the sun’s rays.
Due to the unique property of cooling the wood can reduce the cost of cooling the premises by 20-30% and replace the air conditioning system.
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