What is the third type of super heater?

The third type of super heater is indeed a combination of radiant and convection types. This configuration takes advantage of both heating methods to achieve more efficient steam generation. In the radiant section, heat is directly transferred to the tubes containing water from the hot gases, which promotes rapid heating and steam production. The subsequent convection section then enhances this process by using the movement of hot gases to transfer additional heat, ensuring that the steam reaches the required temperature and pressure for optimal performance in steam plants.

This combined approach maximizes efficiency by utilizing the strengths of both radiant heat (which is most effective at high temperatures) and convection heat (which is effective in transferring energy for further heating). The integration of these two heating methods leads to improved thermal performance and helps in achieving the desired steam conditions needed for various applications in stationary engineering.