摘要 |
PURPOSE:To limit an evaporation quantity of water low and a leaking quantity of water less by a method wherein a necessary quantity of water is injected at a high speed, which is caused to be flowed on a wide interior surface. CONSTITUTION:A sealed space 1 is covered with a transparent plate 2 at the upper part and is insulated with a heat insulation material layer 3. The sealed space 1 is provided with a flat interior wall 4 for a heat exchange, a nozzle 5 is provided on a necessary position and the lower part of the space is provided with a hot water supply outlet 6 which has a comparatively large diameter. |