2 results about "Warm season" patented technology

The application discloses a plateau permafrost area controllable cold region maintaining device, relates to the roadbed maintenance technical field of plateau permafrost area, and comprises a hot rod body, a protection structure is installed at the top of the hot rod body, a transmission mechanism is installed at the top of the protection structure, an environment sensing machine is installed at the top of the transmission mechanism, and a damping mechanism is installed at the top of the transmission mechanism and at the side of the environment sensing machine, the cooperation of the environment sensing machine, the protection structure and the transmission mechanism realizes the full-season self-adaptive regulation and control of automatic covering in the warm season and automatic opening in the cold season, manual intervention and external power driving are not needed, the hot rod body working mode can be automatically switched according to the change of the environment temperature, the technical defects that heat backflow and permafrost warming and thawing are prone to occurring in the summer of the traditional hot rod are solved, and the permafrost temperature control stability and the roadbed safety are remarkably improved.

A photothermal adsorption refrigeration device and its application method for railway subgrades in permafrost regions are disclosed, comprising an above-ground photothermal drive and control unit and an underground phase change heat transfer unit. The device utilizes a metal halide-ammonia chemisorption cycle, using solar photothermal drive to generate a pressure potential difference through desorption / adsorption to replace a mechanical compressor, achieving a system with no moving parts and zero carbon emissions. The method includes geological survey and cooling capacity assessment, selection of device parameters and working fluid, subgrade cross-section layout based on deformation control, construction and commissioning, day / night / seasonal multi-field coupled adaptive operation, and closed-loop feedback. This invention overcomes the limitations of traditional heat pipes that remain dormant in warm seasons. It forcibly extracts heat from the permafrost during the warm season and enhances refrigeration using extremely low temperatures during the cold season, forming a synergistic dual-effect refrigeration of "active in summer and enhanced in winter." This can raise the upper limit of permafrost and control subgrade settlement to the millimeter level, making it suitable for plateau railway engineering, significantly improving the long-term stability of the subgrade and reducing operation and maintenance costs.