| 摘要 |
592759 Disclosed is a solar water heating apparatus (10) which includes concentric inner (14) and outer (12) vessels defining a partially evacuated annular cavity (16) there between, within which cavity (16) a phase change material (W) is located, and which is vaporised when solar radiation is incident on the outer vessel (12), in order to transfer heat to a water store contained in the inner vessel (14), this water store being fed fresh unheated water while the heated water is extracted therefrom for domestic or other purposes. |
