The KM-ZL70A series collector module is a kind of direct flow solar collector, which system consists of vacuum tube, inner tube of vacuum tube, manifold and inner manifold. The inner tube is connected with the inner manifold and the vacuum tube. The heat-transfer fluid flows through the inner manifold, inner tube, vacuum tube and manifold in turn. The effective heating position is the space between inner tube and vacuum tube. This system allows any installation angle of the module between 0° and 90° allowing the absorber surface being adjusted to the optimum position towards the sun.

Direct flow vacuum tube solar collectors apply direct-flow which even increases their efficiency. The heat transfer fluid in the concentric tubes of the absorber transfers the heat. All direct flow collector tubes are connected in parallel. This allows any arrangement of the module at tilt angles between 0° and 90° with the absorber surface adjusted to the optimum angle. Each tube can individually be arranged to the optimum position towards the sun to receive the maximum solar irradiation throughout the year. Due to these characteristics, the collectors can meet special customer demands as integration into facades or horizontal installations on flat roofs.