| 摘要 |
<p>The solar panel comprises a cavity having disposed therein a slab apt to be lapped by the air which has to be heated, the said cavity being provided with a perforation for the inlet and a perforation for the outlet of the said air into and from the said cavity, and is characterized in comprising a second and a third cavity, each of which communicates with the said first cavity, the said second and third cavities being arranged to form sections of channel for the inlet and the outlet of the air into and from the solar panel.</p> |
