| 摘要 |
PURPOSE:To save cost of material for producing a reflecting mirror by a method wherein the semicylindrical reflecting mirror is formed by mirror-finishing the outer surface or the inner surface of a glass cylinder so that the glass cylinder serves also as the reflecting mirror and a glass tube in which it is sealed. CONSTITUTION:One half of the outer or the inner peripheral surface of the circular glass tube is mirror-finished as shown by Numeral 4 and a heat collecting plate 12 having a width of about half the inner diameter of the glass tube is arranged within the glass tube in such a manner that the plate 12 extends between the center of the tube and the center of that part of the inner surface of the tube which corresponds to the mirror-finished part 14. Further, the mirror- finished part 14 is covered with a heat insulating material 15 of a suitable configuration to thereby prevent the releasing of heat out into the atmosphere from the glass tube and a gas such as carbonic acid gas, xenon or the like having a heat transfer efficiency lower than air is sealed into the glass tube so that the heat loss of the solar heat collector is reduced and the heat collecting characteristic of the solar heat collector is improved. |
