Pump gas saturated liquids
Under certain conditions the liquid ring vacuum pump capacity can be increased substantially for a given speed and power consumption. This article is written pump gas saturated liquids a technical overview of the thermodynamics behind this windfall in power savings. The liquid ring vacuum pump is a constant volume device, which means that at a given speed the volume of gas taken in will be a constant.
If the gas steam coming to the vacuum pump contains a condensable vapor, and the vapor is condensed before it is drawn into the bucket of the liquid ring pump, the gas will occupy less space than it had before the gas was condensed. Since the pump draws in a constant volume, a measurement of the pump gas saturated liquids before condensation this is what you care about, the pump gas saturated liquids at your filter or couch roll or uhle box, for instance will be higher than the capacity of the vacuum pump as stated in the pump curves.
To get back to the one cubic foot, we have to add. Since you are paying for CFM per horsepower, this is a bonus; and almost for free. If you put a liquid pump gas saturated liquids an evacuated closed chamber some of the liquid will evaporate until equilibrium is reached between the gaseous phase vapor and the liquid phase. Since the chamber is closed the higher amount of gas pump gas saturated liquids be evidenced by a higher pressure. This pressure is called the saturated vapor pressure. The saturated vapor pressure increases as the temperature rises.
The attached graph shows the saturated vapor pressure of water versus temperature. For a mixture of gases each gas will occupy the same volume and the pressure of the mixture will be the sum of the pressures that each gas pump gas saturated liquids be at if it alone occupied that volume.
This individual pressure is called the partial pressure of the individual gas. So if you have a mixture of air and water vapor, the water vapor can be at any pressure up to the saturation pressure at the temperature of the mixture. Above that pressure the water vapor will turn to water and the vapor pressure will remain constant.
Also, if liquid water is present, the minimum pressure pump gas saturated liquids the mix can be no lower than the vapor pressure of the water vapor, because at this point the gas is all water vapor, there is no air. So for our mix of saturated water vapor and air we have 1. If we have 1 cubic foot of mixture, we will have. The total volume of the mixture is thus. Since we want one cubic foot, we need to add. So you can run the vacuum pump The chart below shows the percentage gains at some other temperatures.
This gain in capacity and decrease in power is almost free. The cost is an increase in the heat produced by the vacuum pump. The heat increase is equal to the energy released when the water condenses. The energy released heats the sealing liquid.
This can be an issue depending upon the cost of the sealing fluid and its treatment if it is recirculated. The above example is clean and theoretical; in actual practice other factors enter the equation. We do not do this as we calculate each pump gas saturated liquids individually and are transparent with the customer in the pump size we recommend for their application and explain all of the assumptions that we make. Call us with your questions, we like to solve your problems.
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