Solar heat collector, solar heat collecting multilayer sheet, and solar heat heater

Abstract

A solar heat collector includes a heat collecting board, a solar radiation absorbing layer provided at one surface in a thickness direction of the heat collecting board, and a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer.

What is claimed is: 
     
         1 . A solar heat collector comprising:
 a heat collecting board,   a solar radiation absorbing layer provided at one surface in a thickness direction of the heat collecting board, and   a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer.   
     
     
         2 . The solar heat collector according to  claim 1 , wherein
 the low emissivity and low solar reflectance layer has an emissivity of 0.75 or less and has a solar reflectance of 50% or less.   
     
     
         3 . The solar heat collector according to  claim 1 , wherein
 the low emissivity and low solar reflectance layer is prepared from a conductive ceramic.   
     
     
         4 . A solar heat heater comprising:
 a solar heat collector, wherein the solar heat collector comprises:   a heat collecting board,   a solar radiation absorbing layer provided at one surface in a thickness direction of the heat collecting board, and   a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer.   
     
     
         5 . A solar heat collecting multilayer sheet comprising:
 a substrate sheet,   a solar radiation absorbing layer provided at one surface in a thickness direction of the substrate sheet, and   a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer.   
     
     
         6 . The solar heat collecting multilayer sheet according to  claim 5 , wherein
 the low emissivity and low solar reflectance layer has an emissivity of 0.75 or less and has a solar reflectance of 50% or less.   
     
     
         7 . The solar heat collecting multilayer sheet according to  claim 5 , wherein
 the low emissivity and low solar reflectance layer is prepared from a conductive ceramic.   
     
     
         8 . A solar heat collector comprising:
 a solar heat collecting multilayer sheet including: a substrate sheet, a solar radiation absorbing layer provided at one surface in a thickness direction of the substrate sheet, and a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer and   a heat collecting board provided at the other surface in the thickness direction of the substrate sheet in the solar heat collecting multilayer sheet.   
     
     
         9 . A solar heat heater comprising:
 a solar heat collector, wherein the solar heat collector comprises:   a solar heat collecting multilayer sheet including: a substrate sheet, a solar radiation absorbing layer provided at one surface in a thickness direction of the substrate sheet, and a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer and   a heat collecting board provided at the other surface in the thickness direction of the substrate sheet in the solar heat collecting multilayer sheet.   
     
     
         10 . A solar heat heater used as a solar water heater comprising:
 a solar heat collector, wherein the solar heat collector comprises:   a heat collecting board,   a solar radiation absorbing layer provided at one surface in a thickness direction of the heat collecting board, and   a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer.   
     
     
         11 . A solar heat heater used as a solar water heater comprising:
 a solar heat collector, wherein the solar heat collector comprises:   a solar heat collecting multilayer sheet including: a substrate sheet, a solar radiation absorbing layer provided at one surface in a thickness direction of the substrate sheet, and a low emissivity and low solar reflectance layer provided at one surface in the thickness direction of the solar radiation absorbing layer and   a heat collecting board provided at the other surface in the thickness direction of the substrate sheet in the solar heat collecting multilayer sheet.