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Any addition of thermal energy to a saturated liquid will cause it to vaporize.
Any subtraction of thermal energy from a saturated vapor will cause it to condense.
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What causes water vapor to turn back into liquid?
Water vapor turns back into liquid through a process called condensation, where the water vapor cools down and loses energy, causing the water molecules to come together and form liquid droplets. This can happen when the temperature drops, or when the air becomes saturated with water vapor.
When does saturated vapor condition exists in HVAC?
Saturated vapor condition exists in HVAC systems when the refrigerant transitions from a liquid to a vapor state at a constant temperature, usually during the evaporation process in the evaporator coil. This state indicates that the refrigerant is absorbing latent heat energy without a change in temperature, leading to efficient cooling or heating of the air passing through the coil.
How does humidity effect the rate of vaporization of a liquid?
Higher humidity decreases the rate of vaporization of a liquid. This is because when the air is already saturated with moisture, it reduces the evaporation rate of the liquid by creating a barrier for vapor molecules to escape into the air.
Which gas forms the liquid first when the air is cooled?
When air is cooled, the gas that typically condenses first to form a liquid is water vapor. This process occurs at a specific temperature known as the dew point, where the air becomes saturated with moisture and water vapor condenses into liquid water droplets.
When alchohol and mercury boil they both change from a liquid to what?
They change from a liquid to a vapor (gas).
What is mean saturated liquid and vapor?
A liquid or vapor is saturated when it is at the temperature and pressure where it would be in equilibrium with the other phase; saturated liquid at the boiling point or saturated vapor at the dew point. If the pressure is raised, the vapor will condense until the pressure is restored to the original pressure or all the vapor is condensed. If the pressure is dropped, a saturated liquid will boil until the pressure rises back to the original pressure or all the liquid has vaporized. If the temperature is increased, a saturated liquid will boil off completely unless the vaporized liquid raises the pressure enough to establish a new equilibrium. If the temperature is dropped, a saturated vapor will condense until the pressure has dropped enough to establish a new equilibrium.
What is meant by saturated liquid vapor?
Any addition of thermal energy to a saturated liquid will cause it to vaporize. Any subtraction of thermal energy from a saturated vapor will cause it to condense.
What is wet vapor?
Wet Vapour is the region which contains a mixture of liquid and vapour. The liquid is saturated liquid and the vapour is saturated vapour. The temperature stays uniform until the entire phase change is complete.
What is the working principle of a condenser?
A condenser rejects heat to the environment to turn vapor into liquid. Ideally a vapor enters the condenser as saturated vapor, meaning it's at the boiling point. The vapor condenses and leaves the condenser at saturated liquid (also at the boiling temperature).
What is a direct expansion evaporator?
Refrigerant enters a direct expansion evaporator as a saturated liquid vapor mix and leaves as a superheated vapor.
What is evoaporation?
Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. The other type of vaporization is boiling, which is characterized by bubbles of saturated vapor forming in the liquid phase.
Why is entropy of saturated liquid lower than saturated vapor for any pure substance?
Because to perform the change of state from the saturated liquid to saturated vapor ( at constant presure ) you have to add heat in the amount of the substance's evaporation latent heat Qev . At constant pressure, temperature will stay fixed at its saturation temperature and the increase in entropy will be (delta S)ev = Qev/Tsat where (delta S)ev is the entropy increment. Tsat is the saturation absolute temperature of the substance. And so the saturated vapor entropy is (delta S)ev larger than the saturated liquid entropy.
What causes water vapor to condense into liquid?
Water vapor condenses into liquid when the air surrounding the vapor cools down, causing the vapor to lose energy and transition into liquid form. This process is known as condensation and typically occurs when the temperature drops below the dew point, the temperature at which the air becomes saturated with water vapor.
What causes water vapor to turn back into liquid?
Water vapor turns back into liquid through a process called condensation, where the water vapor cools down and loses energy, causing the water molecules to come together and form liquid droplets. This can happen when the temperature drops, or when the air becomes saturated with water vapor.
What percent vapor is refrigerant when entering the evaporator?
Typically, refrigerant entering the evaporator is in a saturated state, meaning it is a mix of liquid and vapor. The exact percentage of vapor will depend on the pressure and temperature conditions at that point.
What is saturated gas temperature?
Saturated gas temperature is the temperature at which a gas would be in equilibrium with the liquid phase of the gas (or with the liquid phase of a component of the gas if it was a gas mixture).
What is the temperature at which water vapor in cooling air turns into a liquid water is?
The temperature at which water vapor in cooling air turns into a liquid is called the dew point. At this point, the air is saturated with moisture and can no longer hold any more water vapor, causing condensation to occur.
