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Why you have to allow motive fluid and gas to atmosphere while creating vacuum in condenser?
Condensor radiates heat to turn a volume of gas into a liquid. This change in phase from gas to liquid takes up less volume effecting the pressure and once again boiling point of said liquid. Assuming your dealing with HVAC the compressor is dual duty creating vacuum or compressing in a closed / isolated environment. Because of this the compressor must handle a gas and liquid. Think about the point where the condensor has finished radiating heat and the gas has changed phase returning to liquid. To move the liquid back to the evaporator it must be pumped/vacuumed to the other side. The act of pumping or appling a vacuuum to the liquid can change the liquid to gas again and back at certain points inside the compressor (depending mostly on the Temp or PSI). There is a nice solution to this problem since liquid cannot be compressed and everything needs to be lubricated anyway. Oils/lubricants have been developed over the years than can disolve large amounts of refrigerant very little change in volume. This is why you have to allow for motive fluid and gas to atmosphere when vacuum is applied to a condenser. Hope that helps
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What is Difference between vacuum condenser and atmospheric condenser?
An atmospheric condenser operates naturally at atmospheric pressure (1.013bar). A vacuum condenser operates at pressures below atmospheric and will use some sort of pump to provide a vacuum.
Why the vacuum is maintained in condenser?
For increasing steam turbine efficiency. if vacuum is not maintained then, uncondensable gases and air in condenser will increase the condenser pressure.
How is a vacuum created in a condenser?
by air pump
What is reason for low vacuum in surface condenser?
Reasons for low vacuum: 1. Low gland sealing pressure 2. Condenser tubes choked 3. Condenser cooling water temperature high 4. Leakage in condenser tubes 5. Less cooling water flow
Why the vacuum is maintained in Steam condenser?
It is important to maintain a vacuum in a condenser if you want it to work well.
What causes your lungs to pull in air from the atmosphere?
By expanding them, you create a vacuum inside them; given a portal (your mouth, nose), the vacuum will pull the ambient air in, just as a vacuum cleaner pulls things inside by creating a vacuum.
What is kenotometer?
A kenotometer is an instrument used in steam turbine condensers to measure the vacuum in the steam space of the condenser. The vacuum achieved by the condenser has significant influence on the efficiency of the steam turbine.
Why is vacuum in the condenser of such importance?
If you are talking about a condenser attached to a steam turbine, then a vacuum is important because it extends the usefulness of the steam in the turbine. As you probably know, steam begins to condense back into water at 212 deg at atmospheric pressure. However, in a vacuum condition, the boiling and condensing temperature is lower. Because the condenser is under a vacuum, steam exits the turbine and enters the condenser around 130 deg. This results in more power (mega watts).
What will happen if vacuum in surface condenser is very high?
If the vacuum in the surface condenser it very high, it results in higher practical thermal efficiency. It is important for you to keep the temperature to 100 Celsius or lower for it to work properly.
Who is the creator of the vacuum?
No one. A vacuum is the absence of an atmosphere
What is the use of vacuum pump in thermal power plant?
A vacuum pump is used to expel air and non-condensible gases from the condenser in order to allow it to continue accepting steam (the collapse of which produces the vacuum in a condenser). If the vacuum pump fails, it will take from seconds to a few minutes before enough non-condensible gases build up in the condenser to stop the flow of steam. The non-condensible gases come from the boiler feedwater supply, despite the fact that boiler water is treated to prevent this. The minute amount of air in the water is carried with the steam into the turbine then the condenser where it will concentrate unless removed by the vacuum pump.
How the vacuum is created?
A vacuum is created by removing air or any other gas from a closed container, resulting in low pressure relative to the surrounding atmosphere. This can be achieved using a vacuum pump, which removes gas molecules from the container, creating a space where there are fewer air molecules present.
