Patent ID: 6969495

Claim:
A mat element ( 1 ) or beam element comprising at least: an elongated tube ( 1 ) and inside said tube an upper section ( 2 ) delimited by an upper zone of said tube, a distributor-collector part ( 3 ) comprising one or more secondary orifices ( 7 i ) and comprising at least one main orifice ( 6 ), whereby the passage sections of orifices ( 6 ) and ( 7 i ) are different, said distributor collector part ( 3 ) being delimited by an intermediate section of said tube beneath said upper section, a lower enclosure part ( 4 ) beneath said distributor-collector part ( 3 ) delimited by a lower section of said tube, a first sealing element ( 5 a ) arranged between said distributor-collector part ( 3 ) and said upper section ( 2 ) and a second sealing element ( 5 b ) arranged between said distributor-collector part ( 3 ) and said lower section ( 4 ), distributor and a separation element ( 8 ) arranged inside said distributor-collector part ( 3 ), thus delimiting two spaces ( 3 a , 3 b ) for circulation of fluids.