Absorber tube

The patent introduces a container with protective gas and getter material into the annular space before operation begins. The getter material is pre-positioned to absorb hydrogen as it permeates from the thermal oil, preventing pressure buildup that would otherwise occur over time. This preliminary preparation allows the system to maintain vacuum integrity and low heat conduction throughout the service life.

The patent uses getter material as an intermediary substance between the thermal oil and the evacuated annular space. The getter material absorbs hydrogen atoms that permeate through the metal tube wall, acting as a mediator that prevents hydrogen from accumulating in the annular space and increasing pressure. This intermediary function extends service life while maintaining the energy efficiency benefits of the evacuated space.

The patent distributes multiple getter material containers at different positions within the annular space, including both inner and outer regions. This spatial distribution ensures that hydrogen absorption occurs uniformly throughout the annular space, compensating for local temperature variations caused by solar radiation. Each container maintains local pressure equilibrium, preventing non-uniform pressure conditions.

The patent divides the getter material into multiple separate containers rather than using a single large container. This segmentation allows better thermal management and more uniform heat distribution across all getter material portions. The multiple containers can be positioned to receive relatively uniform solar radiation, reducing temperature fluctuations and maintaining stable absorption capacity throughout the annular space.

The patent introduces the protective gas container and getter material into the annular space during the initial vacuum evacuation process, before the system begins operation. The container is sealed in place with soldering points that remain closed during normal operation. This preliminary setup eliminates the need for complex later interventions to introduce gas or replace getter material, greatly simplifying practical implementation while maintaining the ability to reduce heat conduction when needed.

The patent designs the container with getter material and protective gas to automatically absorb hydrogen and maintain pressure equilibrium without external intervention. The system self-regulates hydrogen levels through the getter material's passive absorption capability, eliminating the need for complex monitoring and manual refilling systems. This self-service approach reduces implementation complexity while maintaining energy efficiency.