Table of Contents
- 1 Why is steam condensed?
- 2 Why does water vapor condense in the condenser tube?
- 3 What happens when steam is condensed in a convection unit?
- 4 Why condensate steam is recirculated to boiler?
- 5 Is condensing steam endothermic or exothermic?
- 6 What is a condensing Vapour?
- 7 What happens to the water inside the condenser when it cools?
- 8 How does a steam condenser increase the heat transfer rate?
Why is steam condensed?
In devices of the first type, steam is condensed at below atmospheric pressure so as to gain the maximum amount of energy from it. In noncondensing turbines, steam leaves the turbine at above atmospheric pressure and is then used for heating or for other required processes before being returned as water to the boiler.
Why does water vapor condense in the condenser tube?
The water vapor molecules transfer energy to the colder air. This makes the water vapor molecules move more slowly. Their attractions overcome their motion and they join together or condense to form liquid water.
What happens when steam is condensed?
When liquid water solidifies it becomes ice.
What is condensed steam called?
Properties of Condensate Steam that has been condensed back into water by either raising its pressure or lowering its temperature. Not to be confused with demineralized, de-ionized, make up, or softened water.
What happens when steam is condensed in a convection unit?
Unlike heat transfer by convection (e.g. hot water), heat transfer by condensation (e.g. steam) does not involve a temperature change. When steam condenses on the heat transfer surface, it passes on its latent heat to the product. This enables even heating across the whole heat transfer surface.
Why condensate steam is recirculated to boiler?
At the end of a steam power cycle, the steam is condensed to water. A condensate pump recirculation water valve controls the bypass flow from the pump outlet back to the condenser, preventing overheating and cavitation in the pump. …
Why does water vapor condense in the condenser tube quizlet?
The purpose of a condenser coil is to reject unwanted heat from a refrigeration or air conditioning system. It does this by condensing the high pressure, high temperature gas to a liquid. After all the vapor is condensed to liquid, the liquid is subcooled in the last portion of the condenser.
How vapors are condensed in condenser?
In an evaporative condenser, hot, low-pressure vapor from the turbine exhaust circulates through a condensing coil that is continually wetted on the outside by a recirculating water system. This evaporation removes heat from the coil, thereby cooling and condensing the vapor.
Is condensing steam endothermic or exothermic?
As water vapor condenses into liquid, it loses energy in the form of heat. Therefore, this process is exothermic.
What is a condensing Vapour?
The condensing vapor is often an organic compound or mixture and the coolant is most often water, a combination that favors the use of finned tubes. Therefore, the condensing vapor is most frequently placed in the shell (the finned side) and the cooling water, which is usually more prone to fouling, flows in the tubes.
Why is steam used in heat exchanger?
Steam is used as a heating medium in heat exchangers. Low pressure (LP) steam carries more latent heat, is normally of higher quality, reduces scaling, and reduces the fouling factor. LP steam typically requires pressure reducing values, which require more space and require large pipes for condensation.
What is the function of condenser in steam power plant?
A steam condenser is a closed vessel in which steam is condensed by abstracting the heat by cooling it with water and where the pressure is maintained below atmospheric pressure. The condensed steam is known as condensate. The efficiency of the steam power plant is increased by the use of a condenser.
What happens to the water inside the condenser when it cools?
When the cooling water is coming into the contact with the tube inside which steam is following then some portion of the cooling water is absorbed heat and vapourised. As the heat is now taken from the steam so it is now converted into water and collected outside of the condenser.
How does a steam condenser increase the heat transfer rate?
It also increases the heat transfer rate by eliminating other non-condensable gases from the exhaust steam. Inside a steam condenser, there is a flow of cooling water which is continuously circulating from condenser to cooling tower and cooling tower to the condenser.
How is the condensate extracted from the condenser?
After heat exchange, the condensate stored at the bottom of the condenser and by the help of condenser removal pump it is extracted. In this type of condenser, the condensate is also heated by the help of exhaust steam which comes into the condenser, and then the condensate is feed to the steam generator.