Not a hydrologist, but I'd lay money on the fact that steam is mostly air, and ice is mostly water.
In order for a high temperature boiler or steam engine to produce superheated water, or steam?
steam quality increase
If by dry steam you mean superheated steam then dry steam because it has a higher calorific value
The heat transfer coefficient of superheated steam is poor. Saturated steam has a better heat transfer coefficient, and also most of the heat transferred from steam occurs because of the condensation phase change.
If you heat steam under pressure you get "superheated steam" under higher than original pressure
In order for a high temperature boiler or steam engine to produce superheated water, or steam?
Superheated steam.
steam quality increase
That would depend on if the steam is superheated dry steam or not and if superheated dry steam its temperature. It should be possible to google "boiler equations" or "boiler design" to get details.
No, steam is not superheated water. Steam is the gaseous form of water that is created when water is heated to its boiling point and vaporizes. Superheated water is water that has been heated beyond its boiling point and exists in a state where it is hotter than its boiling point.
If by dry steam you mean superheated steam then dry steam because it has a higher calorific value
No, superheated steam gives off little energy. Most of the heat given off by steam is the latent heat of condensation as it undergoes a phase change from vapor to liquid. Superheated steam could first be "desuperheated" by adding water until it reaches the saturation point, then used for heat transfer processes.
The heat transfer coefficient of superheated steam is poor. Saturated steam has a better heat transfer coefficient, and also most of the heat transferred from steam occurs because of the condensation phase change.
because if the steam is not superheated the remaining water droplets reduce efficiency and can cause corrosion and pitting. +++ Nearly! Saturated steam, as non-superheated steam is called, is really only steam at the pressure and temperature in the boiler. Once it starts to expand as a gas in doing its work, the pressure and temperature fall and condensation will set in, leaving less and less useful water-vapour to act as a gas. Hence, as you say, the efficiency falls.
If you heat steam under pressure you get "superheated steam" under higher than original pressure
Superheated steam is created by heating saturated steam beyond its boiling point at a given pressure. This is typically done in a superheater, where saturated steam from a boiler is passed through a heat exchanger, often using hot gases or additional heat sources. The process increases the steam's temperature while maintaining its pressure, resulting in superheated steam, which is more efficient for driving turbines or for certain industrial applications.
Superheated steam is steam at a temperature higher than water's boiling point