| 摘要 |
PURPOSE:To reduce the area of installation for the heat collector by a method wherein a heat collecting tube introducing part is made smaller than the diameter of a light permeable outer tube in the vacuum tube for the solar heat collector having a constitution, in which a heat collecting plate as well as the heat collecting tube are accommodated in the light permeable outer tube and are sealed by vacuum sealing. CONSTITUTION:The heat collecting tube introducing part 13 is made smaller than the light permeable outer tube 10 in the vacuum tube for the solar heat collector having a constitution wherein the heat collecting plate 11 as well as the heat collecting tube 12 are accommodated in the light permeable outer tube 10 and are sealed by vacuum sealing. According to this constitution, the outer diameter of a rubber bush 3 for precluding the invasion of rain water may be made smaller than the outer diameter of the light permeable outer tube 10 and, consequently, a dimension (b) may be determined to the minimum distance through which the rain water can drop while the area of installation for the solar heat collector may be minimized. Therefore, an effective heat collecting area per area of installation for the solar heat collector may be increased and the heat collecting efficiency per area of installation may be increased. |
