| 摘要 |
PURPOSE:To make all of the flow rates in heat collecting tubes nearly constant by a structure wherein the efflux passage side cross-sectional area of an influx branch passage is made smaller than the influx passage side cross-sectional area of the influx branch passage at the heat collecting plate, in which an influx passage and an efflux passage are respectively communicated to the influx branch passage and an efflux branch passage and said both branch passages are communicated to each other by means of a plurality of the heat collecting tubes. CONSTITUTION:The heat collecting plate 1 consists in the manner that in communicating the influx passage 6 and the efflux passage 9, both of which communicate to a hot water storage tank respectively, to the influx branch passage 3 and to the efflux branch passage 2 respectively and in communicating both the branch passages 3 and 2 to each other by means of a plurality of the heat collecting tubes. In this case, the cross-sectional area S1 of the influx branch passage 3 in the portion ranging 1/10-1/2 of its total length L of the passage 3 starting from the efflux passage 8 side is made 1/4-4/5 times smaller than the cross-sectional area S of the influx branch passage 3 at the influx passage 6 side in order to form a throttling part 10. Owing to the structure as described above, because the flow speed is suppressed at the throttling part 10 in the circulation of working fluid in the plate 1, the flow speed of the fluid passing through the influx passage 6 side heat collecting tubes 4 can be nearly equalized with that of the fluid passing through the efflux passage 8 side heat collecting tubes 4. |
