Table of Contents
Why is superheated steam not used in process heating?
Superheated steam is also not useful for heating, but it has more energy and can do more work than saturated steam, but the heat content is much less useful. This is because superheated steam has the same heat transfer coefficient of air, making it an insulator – a poor conductor of heat.
What is a drawback of adding superheating to a Rankine Cycle?
The steam must be reheated or superheated to avoid damages caused to the blades of the steam turbine by low-quality steam. The high content of water droplets can cause rapid impingement and erosion of the blades, which occurs when condensed water is blasted onto the blades.
What is the effect of superheated steam?
Superheated steam has to cool to saturation temperature before it can condense to release its latent heat (enthalpy of evaporation). The amount of heat given up by the superheated steam as it cools to saturation temperature is relatively small in comparison to its enthalpy of evaporation.
Why superheated steam is used in turbine?
Superheated steam is preferred over saturated steam because it can release a lot of its internal energy for work and remain above the liquid’s water vapor point (at a given pressure within the turbine/piston engine). Droplets of liquid that are formed can result in pitting of turbine blades.
Why steam is superheated give pros and cons of superheated steam?
Superheated steam is mainly used in propulsion/drive applications such as turbines, and is not typically used for heat transfer applications….Disadvantages of using superheated steam for heating:
| Property | Disadvantage |
|---|---|
| Low heat transfer coefficient | Reduced productivity |
| Larger heat transfer surface area needed |
When water is heated without rise of temperature it consumes?
When water is heated, latent heat of vaporisation is consumed to overcome the intermolecular forces of attraction at a constant temperature.
What are the disadvantages of superheated steam?
Disadvantages of using superheated steam for heating:
| Property | Disadvantage |
|---|---|
| Low heat transfer coefficient | Larger heat transfer surface area needed |
| Variable steam temperature even at constant pressure | Superheated steam needs to maintain a high velocity, otherwise the temperature will drop as heat is lost from the system |
What is the effect of superheated steam in a Rankine Cycle?
Explanation: The effect of superheated steam on efficiency of Rankine cycle is that the efficiency of Rankine cycle increases with increase in superheat of the steam.
What is the effect of superheated steam on Rankine Cycle?
What are the advantages of superheated steam?
Advantages of using superheated steam to drive turbines:
| Property | Disadvantage |
|---|---|
| Low heat transfer coefficient | Larger heat transfer surface area needed |
| Variable steam temperature even at constant pressure | Superheated steam needs to maintain a high velocity, otherwise the temperature will drop as heat is lost from the system |
Why superheated steam is more suitable for applications such as steam turbines in electric power plants?
Superheated steam is often used in steam turbines to prevent damage to equipment caused by the inflow of condensate. In certain types of nuclear power plants, however, the use of high temperature steam must be avoided, as it would cause problems with the material used in the turbine equipment.
What is the effect of superheated steam on efficiency of Rankine Cycle?