What the sources of air leakage in to the condensers how its pressure is determined?

(i) Leakage through packing glands and very small holes in the shell. (ii) Leakage through joints and vents from atmospheric relief valves and other accessories. (iii) Dissolved gases or air in boiler feed water, which ultimately enters the condenser with exhaust steam.

What is the effect of air leakage in condenser?

Explanation: Air leakage in the condenser reduces the thermal efficiency of the steam power plant. It increases the amount of cooling water required and also increases the corrosive action in the condenser. The heat transfer rate in the condenser is reduced.

What happens to pressure in a condenser?

In a condenser, the refrigerant flow velocity is reduced as the refrigerant condenses, because the liquid phase has a much smaller specific volume than the gas phase. Hence, the major part of the pressure drop of the condenser is induced in the desuperheating operation, when the refrigerant is still a gas.

What are the effects of presence of air in the condenser on its performance?

The presence of air lowers the partial pressure of steam and therefore brings down the saturation temperature of steam, which leads to increasing evaporation enthalpy (latent heat), and therefore, more cooling water will be required in the condenser.

How do you proceed to check the leakage of air into a condenser?

Hence detection of air ingress into the condenser is an important work in power plant. The most common method to identify condenser air in-leakage test is gaseous tracer gas leak test, in which helium or SF6 is used as a tracer gas.

Why is the condenser called the atmospheric?

It basically takes out the latent heat of vaporization; from the gas mixture whether be steam or gas refrigerant to covert it back to liquid. Condenser that works under vacuum such as in boilers are called vacuum condenser; while the others working under normal or low vacuum condition are called atmosphere condenser.

How does the air leakage affect the condenser performance in a steam turbine?

The effects of air leakage in the condenser are: (a) It increases the pressure in the condenser which limits the amount of work done by unit mass of steam in the engine or turbine. (b) It lowers the partial pressure of steam and temperature.

What is the partial pressure of air in case of air leakage in condenser exam Veda?

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively.

How do I lower my condenser pressure?

By decreasing the average temperature at which heat is rejected from the working fluid (steam) in the condenser. (Lowering condenser Pressure) By increasing steam temperature entering the turbine.

Why is condenser pressure low?

Cooling Towers and Water-Cooled Condensers The condensing pressure is generally much lower because the cooling tower performance depends on the ambient wet-bulb temperature. The net result is reduced energy costs but increased capital and maintenance costs.

What is leakage of condenser?

A condenser coil leak is a serious problem. It’s a very expensive repair that can often result in the full replacement of your unit. A leak in your condenser coil will leak refrigerant, causing your system to have less than the recommended charge (amount) of refrigerant in your system.

Which of the following is the result of air leakage in steam condenser Mcq?

Clarification: Air leakage reduces thermal efficiency of a condenser. The leaked air increases back-pressure on the prime mover which results in loss of heat drop and a result the thermal efficiency of the steam power plant is lowered. 7.

What happens when an air leakage comes out of a condenser?

Quora User, The Problem is you think you have time. In power plant Condenser is used to condense the steam coming out of turbine. If the air leakage happens in. Condenser then it will results in pressure increase in Condenser since it operates at vacuum.

What causes the condenser pressure to rise or fall?

The condenser pressure would rise or fall naturally as the cooling water temperature or steam flow vary. It is in situations where the NCG system has insufficient capacity that improvements in it can improve the condenser pressure.

What is the effect of an air leak on a turbine?

Air l leak also result in increased back pressure on turbine. In power plant Condenser is used to condense the steam coming out of turbine. Condenser then it will results in pressure increase in Condenser since it operates at vacuum.

What is the function of a condenser in a power plant?

In power plant Condenser is used to condense the steam coming out of turbine. If the air leakage happens in Condenser then it will results in pressure increase in Condenser since it operates at vacuum. At lower pressure saturation temperature is less hence we can extract more work from steam in turbine.