Solar Light (Heat) Absorption Material and Heat Absorption/Accumulation Material and Solar Light (Heat) Absorption/Control Building Component Using the Same

Abstract

A solar light (heat) absorption material is provided which has an excellent solar light (heat) absorbing ability and a simple structure, and may be usable as a low-cost and high-performance heat absorption/accumulation material, the inventive material being usable also as a solar light (heat) absorption/control building component that allows easy change of its solar light (heat) absorption/control ability. The material comprises particles dispersed into a liquid medium having a specific heat ranging from 0.4 to 1.4 cal/g/° C. and a melting point of 5° C. or lower. The dispersed particles have L*value of 30 or less as determined by the CIE-Lab color system (light source D65).

Description

TECHNICAL FIELD[0001]The present invention relates to a solar light (heat) absorption material having excellent solar light (heat) absorption. More particularly, the invention relates to a heat absorption / accumulation material utilizing the solar light (heat) absorption material comprising a heat absorbent material and a heat accumulation material integrated together, thus achieving less heat loss from the heat absorption / accumulation material, so that the heat absorption / accumulation material has excellent solar heat-absorbing efficiency and relates also to a heat absorption / accumulation structure, a cooling system or a power generating system utilizing the heat absorption / accumulation material.[0002]The invention also relates to a solar light (heat) absorption / control building component using the above-described solar light (heat) absorption material and having excellent ability to absorb / control solar light (heat), the solar light (heat) absorption / control building component allo...

AI Technical Summary

Benefits of technology

[0056]The solar light (heat) absorption material of the invention has an excellent solar light (heat) absorbing ability. Further, as this material uses char particles originated from harmless biomass, waste material can be effectively utilized and also the load to the environment can be alleviated. Further, in case this is used as a heat absorption / accumulation material, as the particles of the heat absorption material are dispersed into the liquid of the heat accumulation material and in association with rise in the temperature of the heat absorption material, the heat is transferred directly to the heat accumulation material around it, heat loss in the course of heat conduction process can be restricted. In the case of the convention, in association with temperature rise due to heat absorption, dissipation of heat by black body radiation from the heat absorption material per se occurs inevitably. On the other hand, in the case of the present invention, since the heat absorption material is dispersed into the heat accumulation material, all of the heat dissipation from the heat absorption material is absorbed by the heat accumulation material. In this way, the heat loss in the heat conduction process is reduced and no dissipation of heat to the outside occurs, so the efficiency of the solar heat absorption is high.

[0057]Further, in order to obtain high-temperature heat, the conventional techniques combine a light collecting plate having a large area and a heat accumulation tank having a small area. However, as the area of the heat collecting plate is increased, the amount of dissipation heat increases correspondingly. Hence, there would be required a measure to cope with this, so the technique would suffer from this vicious cycle and the conventional technique was not found satisfactory in terms of efficiency and cost.

[0058]In contrast, in the case of the present invention, the temperature of the accumulated heat can be controlled by adjustment of the thickness of the heat absorption / accumulation material layer. Therefore, high-temperature heat can be obtained extremely easily and at low cost.

[0059]Further, with the solar light (heat) absorption / control building component of the present invention, its solar light (heat) absorption / control ability can be easily changed by changing the kind, size and / or dispersion content of the particles. Further, by using this component in an agricultural / horticultural facility or a house / building, excess energy for cooling / warming can be eliminated and it becomes also possible to make significant contribution to the saving of fossil fuels and preservation of the global environment.

Problems solved by technology

Recently, the earth has been facing serious problems such as global warming, depletion of fossil fuels, etc.

However, all of these are expensive, thus going counter to the need for manufacturing cost restriction.

However, all of these, based fundamentally on the same principle, have been unable to achieve performance improvement, cost reduction and downsizing of any significant degrees.

However, when these measures are taken, there inevitably occurs increase of heat loss from the light collecting plate (black-body radiations ≡σT4).

In order to restrict this heat dissipation, it has been required to provide a selective absorption membrane, to evacuate the space where the light collecting plate is installed or to charge an amount of rare gas therein, these are inviting greater complexity, enlargement and cost increase of the apparatus.

As described above, with the conventional solar water heaters, greater complexity, size enlargement, use of special material, etc. have been required for improving performance and all of which lead to increase in the manufacture cost.

Also, in cold zones, an enormous amount of energy is needed for elevating a temperature suitable for culture.

And, an enormous amount of electric energy is needed for ensuring sufficient light amount.

Notwithstanding, these materials do not allow change of their ability to absorb / control the solar light (heat).

Hence, they provide adverse effect to the culture of crop plants due to the amount of light falling far below the amount suitable for their culture.

Further, in a house or a building too, its roof or wall is heated due to daytime solar radiation, so that there occurs rise in the temperature in the living space inside, thus deteriorating the living environment.

If air conditioning is effected for reducing the temperature rise, the amount of electric energy required therefor will be enormous, thus promoting the global warming, hence causing vicious cycle.

However, these conventional solar light (heat) absorption / control building components are also unable to allow change of their ability to absorb / control the solar light (heat).

Hence, these materials can be disadvantageous in the autumn / winter seasons or on cloudy days when the amount of solar radiation is small.

Moreover, although the convention has provided some improvements in the heat insulating material for building wall or roof or method of heat insulation, as these heat insulating methods are passive heat insulation methods, these suffer the problem that the temperature of the heat insulating material per se rises, in accordance of which its heat insulating effect deteriorates over time.

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