(WO9709573-A1)      A solar collector comprises a gas dammed tube (1) which is transparent to sunlight, an absorber surface (2) which is in contact with other tubes (3) (pref. of copper) for heat transfer fluids, and a lid (10) (pref. of copper) with penetrations (2) at one end of the tube (1). The tubes are filled with a gas which has a lower thermal conductivity than air, pref. krypton (esp.), xenon, argon and/or carbon dioxide. The lid is pref. adhered to the tube using a butyl adhesive and a silicone seal.    USE -   The arrangement is used in solar collector units.    ADVANTAGE -   The collector has improved performance and mechanical stability.    (EP848799-A1)      A solar collector comprises a gas dammed tube (1) which is transparent to sunlight, an absorber surface (2) which is in contact with other tubes (3) (pref. of copper) for heat transfer fluids, and a lid (10) (pref. of copper) with penetrations (2) at one end of the tube (1). The tubes are filled with a gas which has a lower thermal conductivity than air, pref. krypton (esp.), xenon, argon and/or carbon dioxide. The lid is pref. adhered to the tube using a butyl adhesive and a silicone seal.    USE -   The arrangement is used in solar collector units.    ADVANTAGE -   The collector has improved performance and mechanical stability.    (DE29522074-U1)      A solar collector comprises a gas dammed tube (1) which is transparent to sunlight, an absorber surface (2) which is in contact with other tubes (3) (pref. of copper) for heat transfer fluids, and a lid (10) (pref. of copper) with penetrations (2) at one end of the tube (1). The tubes are filled with a gas which has a lower thermal conductivity than air, pref. krypton (esp.), xenon, argon and/or carbon dioxide. The lid is pref. adhered to the tube using a butyl adhesive and a silicone seal.    USE -   The arrangement is used in solar collector units.    ADVANTAGE -   The collector has improved performance and mechanical stability.    (JP11512173-W)      A solar collector comprises a gas dammed tube (1) which is transparent to sunlight, an absorber surface (2) which is in contact with other tubes (3) (pref. of copper) for heat transfer fluids, and a lid (10) (pref. of copper) with penetrations (2) at one end of the tube (1). The tubes are filled with a gas which has a lower thermal conductivity than air, pref. krypton (esp.), xenon, argon and/or carbon dioxide. The lid is pref. adhered to the tube using a butyl adhesive and a silicone seal.    USE -   The arrangement is used in solar collector units.    ADVANTAGE -   The collector has improved performance and mechanical stability.    (EP848799-B1)      A solar collector comprises a gas dammed tube (1) which is transparent to sunlight, an absorber surface (2) which is in contact with other tubes (3) (pref. of copper) for heat transfer fluids, and a lid (10) (pref. of copper) with penetrations (2) at one end of the tube (1). The tubes are filled with a gas which has a lower thermal conductivity than air, pref. krypton (esp.), xenon, argon and/or carbon dioxide. The lid is pref. adhered to the tube using a butyl adhesive and a silicone seal.    USE -   The arrangement is used in solar collector units.    ADVANTAGE -   The collector has improved performance and mechanical stability.