Day and night dual-effect radiation cooler and preparation method thereof

Abstract

The invention discloses a day and night dual-effect radiation cooler and a preparation method thereof. The cooler is composed of a broad-spectrum strong-reflection metal substrate and a 8-14 [mu]m infrared strong-selectivity radiation coating smeared on the surface of the substrate, wherein the 8-14 [mu]m infrared strong-selectivity radiation coating consists of a visible-infrared transparent polymer and a 8-14 [mu]m infrared strong-selectivity radiation active nano functional composition, a mass content of the visible-infrared transparent polymer is 10%-80%, and the 8-14 [mu]m infrared strong-selectivity radiation active nano functional composition is composed of nano silica, a rare earth silicate compound and a molybdate compound according to a mass ratio of 1:(0.5-2):(0.5-2). The radiation cooler has excellent solar reflection and 8-14 [mu]m high radiation characteristics, so that the radiation cooler can exert an efficient self-cooling function under conditions of both sunlight irradiation and no sunlight irradiation, can be used for temperature-lowering and cooling with zero energy consumption of facilities and apparatuses such as buildings, grain and oil storage, high-power electronic equipment, and refrigerated bags, and has potential huge energy-saving effects.

Description

technical field [0001] The invention belongs to the technical field of heat radiation, and in particular relates to a day and night double-effect radiation cooler and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the problem of energy crisis has become increasingly prominent. Air-conditioning cooling accounts for a considerable proportion of energy consumption. The development of efficient radiation cooling technology is of great significance for reducing power consumption and protecting the environment. Radiation cooling refers to the process that objects on the earth transfer heat to outer space through infrared atmospheric windows. Radiation cooling materials are materials with spontaneous cooling functions prepared based on this principle. In the process of heat transmission, the atmosphere is the main transmission medium of infrared radiation. Although the atmosphere is transparent to visible light, a large...

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Problems solved by technology

[0004] At present, the radiation cooler under the condition of no light at night has been realized, but the high-performance radiation cooler that meets the practical performance requirements under the daylight condition has not yet appeared.

The existing publicly reported radiation coolers mainly include the following methods: one is to construct a nanostructured radiation cooler through photo-etching technology and nano-plasma deposition technology. The cost of photon radiation coolers with this structure is high, and it is impossible to achieve large-scale Large-scale production, and the photon radiation cooler has low structural strength, easy damage, and poor long-term stability

The other is to bond inorganic functional substances such as titanium dioxide and glass microspheres with polymers to a highly reflective metal substrate to obtain a radiation cooler. However, due to the absorption of functional substances such as titanium dioxide and glass microspheres in the infrared spectral region Insufficient performance, the non-infrared atmospheric window of the prepared radiation cooler has high absorptivity and emissivity outside the range of 8-14 μm, poor selective radiation ability, easy to absorb a large amount of additional atmospheric thermal radiation from the environment, and then make the radiation The overall cooling effect of the device is weakened, and the effective cooling power is not ideal

At present, a day and night dual-effect radiation cooler and its preparation method that can be used in both daytime and dark environments and can be manufactured on a large scale at low cost have not yet been reported.