| 摘要 |
Said surface can be used for domestic heating and for utilising solar energy, and has one or two layers situated on the inside (1) of the surface, incorporating a long tube (2) which conveys hot water or other heating fluid, said tube being bent in a serpentine manner so as to have a great development in length in a small area, and one layer situated on the outside (3) of the surface. Said tube (2) can be made of plastic material with a diameter such that it can be inserted into the undulations of undulated cardboard (1), the internal layer of linoleum. <IMAGE>
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