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).

1 . A solar light (heat) absorption material comprising particles, which have L*value of 30 or less as determined by CIE-Lab color system (light source D65), 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. 
     
     
         2 . The solar light (heat) absorption material according to  claim 1 , wherein said medium is selected from the group consisting of water, aliphatic mono alcohol, aliphatic di-alcohol, and hydrocarbon. 
     
     
         3 . The solar light (heat) absorption material according to  claim 2 , wherein said aliphatic mono alcohol is selected from the group consisting of ethyl alcohol, propyl alcohol, butyl alcohol, amyl alcohol, and hexane alcohol. 
     
     
         4 . The solar light (heat) absorption material according to  claim 2 , wherein said aliphatic di-alcohol is selected from the group consisting of ethylene glycol, propylene glycol, polyethylene glycol, and polypropylene glycol. 
     
     
         5 . The solar light (heat) absorption material according to  claim 2 , wherein said hydrocarbon is selected from the group consisting of paraffin, benzene, xylene, and chlorobenzene. 
     
     
         6 . The solar light (heat) absorption material according to  claim 1 , wherein said particles comprise carbonized materials of biomass. 
     
     
         7 . The solar light (heat) absorption material according to  claim 6 , wherein said carbonized materials of biomass has micropores. 
     
     
         8 . The solar light (heat) absorption material according to  claim 6 , wherein said biomass comprises bagasse. 
     
     
         9 . The solar light (heat) absorption material according to  claim 1 , wherein said particles have a particle diameter of 3 mm or less. 
     
     
         10 . The solar light (heat) absorption material according to  claim 1 , wherein the material comprises, in said medium, a substance having a phase transition temperature in the temperature range from 50 to 120° C., with this substance being out of direct contact with the medium. 
     
     
         11 . A heat absorption/accumulation material comprising the solar light (heat) absorption material according to  claim 1 . 
     
     
         12 . A heat absorption/accumulation structure having the heat absorption/accumulation material of  claim 11  filled in a container having an opening thereof covered with a light transmitting body. 
     
     
         13 . The heat absorption/accumulation structure according to  claim 12 , wherein a layer of heat absorption/accumulation material has a thickness for achieving light transmittance of 10% or less for light of 550 nm. 
     
     
         14 . The heat absorption/accumulation structure according to  claim 12 , wherein the heat absorption/accumulation structure is configured to absorb/accumulate solar heat. 
     
     
         15 . A solar water heater comprising the heat absorption/accumulation structure according to  claim 12 , wherein a medium for the heat absorption/accumulation material filled in said heat absorption/accumulation structure comprises water. 
     
     
         16 . A cooling system using heat accumulated in the heat absorption/accumulation structure according to  claim 12  as a heat source for an absorption refrigerator or an adsorption refrigerator. 
     
     
         17 . A power generating system using heat accumulated in the heat absorption/accumulation structure according to  claim 12  as a heat source for a temperature-difference power generation. 
     
     
         18 . A solar light (heat) absorption/accumulation building component comprising a hollow portion and an amount of the solar light (heat) absorption material according to  claim 1  filled in the hollow portion of a plate-like body having an upper face and a lower face at least one of which has light transmission characteristics. 
     
     
         19 . The solar light (heat) absorption/accumulation building component according to  claim 18 , wherein the solar light (heat) absorption material is circulated to/from an external instrument. 
     
     
         20 . The solar light (heat) absorption/accumulation building component according to  claim 18 , further comprising a detecting means for detecting a outside condition and an adjusting means for adjusting the light absorbance of the solar light (heat) absorption material according to the outside condition. 
     
     
         21 . The solar light (heat) absorption/accumulation building component according to  claim 20 , wherein said outside condition comprises lightness and/or temperature. 
     
     
         22 . The solar light (heat) absorption/accumulation building component according to  claim 18 , further comprising a converting means for covering the solar heat absorbed by the solar light (heat) absorption material into hot water/air or cool water/air. 
     
     
         23 . The solar light (heat) absorption/accumulation building component according to  claim 18 , wherein said component comprises a windowpane, a roof tile or a roofing material. 
     
     
         24 . An agricultural/horticultural facility using said solar light (heat) absorption/control building component according to  claim 18  in its wall and/or ceiling. 
     
     
         25 . A house/building using said solar light (heat) absorption/control building component according to  claim 18  in at least a part of its wall, window, roof or roof top.