Table of Contents
- 1 How vacuum efficiency and condenser efficiency are related?
- 2 How do you calculate vacuum efficiency?
- 3 How do you increase the efficiency of a condenser?
- 4 How do you increase condenser efficiency?
- 5 Why vacuum is maintained in condenser?
- 6 How do vacuum pumps improve the efficiency of a steam condenser?
- 7 What happens to steam condenser when steam pressure is low?
Vacuum efficiency depends upon the effectiveness of air cooling and the rate at which air is removed by the air pump. CONDENSER EFFICIENCY: The thermal efficiency of a condenser is defined as the ratio of actual rise in temperature of cooling water to the maximum possible rise.
What happen if the vacuum inside the condenser increases?
When a vacuum exists in the condenser, atmospheric air will leak into the condenser shell through flanges and other leakage points raising the condenser pressure. Dissolved gas in the water used to raise the steam will also enter the condenser along with the steam, but will not condense.
How do you calculate vacuum efficiency?
Vacuum efficiency = (Actual vacuum in condenser X 100)/Max.
What is the vacuum efficiency of condenser?
What is the vacuum efficiency of a condenser? Answers: It is the ratio of the actual vacuum at the steam inlet to the maximum obtainable vacuum in a perfect condensing plant, i.e., it is the ratio of actual vacuum to ideal vacuum.
How do you increase the efficiency of a condenser?
Reducing cooling water temperatures is a sure-fire way to improve condenser performance: A decrease in cooling water temperature of 10 degrees F can improve the overall heat rate of a power plant by 1\%.
What is vacuum in steam turbine?
Vacuum applies to steam turbines because the pressure of saturated vapour above available cooling water is well below 1 bar (typically 17 mbar at 15°C ambient). These shortcomings are examined and used to explain the anomalous response of a turbine to a copious supply of cold winter cooling water.
How do you increase condenser efficiency?
What are the factors affecting the efficiency of a steam generating unit?
There are several factors that influence the energy performance of boilers including fuel characteristics, firing method, steam pressure, and heating capacity. The main challenge to ensure optimal operating conditions for boilers is to provide the proper excess air for the fuel combustion.
Why vacuum is maintained in condenser?
In other words, the specific volume of water at a given pressure is many times lower than that of steam. A vacuum is maintained in the condenser so that steam can easily flow and more work can be extracted from the steam in the turbine; this is the reason why vacuum is maintained in condensers.
What is the purpose of a variablevacuum in a steam turbine?
Vacuum is created in steam turbine condenser for obtaining more workoutput from the steam turbine. Also there is limitation in amount of vacuum done in condenser because it worsen the quality of steam entering the low pressure or last turbine. More water droplet enters into turbine if vacuum is kept too low in condenser.
How do vacuum pumps improve the efficiency of a steam condenser?
Continuously running vacuum pumps (i have worked with liquid ring type vacuum pumps and some power plants also have ejectors which serve similar purpose) keep condensers as free of air/dissolved gases as possible. This will further improve the efficiency of the condenser.The steam is condensed at low pressure using cooling water.
What is the purpose of condensing in a turbine?
Condensing turbines are power turbines, so that expansion is against vacuum pressure, to lower cold temperature and increase expansion and power, and also efficiency. Normally exhaust steam is already wet (thus partially condensed); it then goes to a condenser at vacuum pressure to complete the cycle.
What happens to steam condenser when steam pressure is low?
Vacuum pump maintaining vacuum in steam condenser and as vacuum increases steam pressure at exit of turbine is low so results into fasten the condensation process. @D.B Jan I thank you Sir, meaning the condenser will be ineffective to condensate the exhausted steam from the low pressure turbine, that will results to load loss to the Rankine cycle.