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The change of state from vapor/gas into a liquid, reverse to evaporation. If a vapor becomes supersaturated, condensation takes place and heat is surrendered. For example, in a seawater cooled condenser, a compressor has raised the pressure of the vapor to such an extent that at seawater temperature, it is supersaturated. Condensation takes place, and the latent heat released heats up the water passing through the condenser tubes; the heated seawater passing overboard into the sea, to be replaced continuously by fresh cool water. The resulting condensate will be somewhat warmer than the seawater coolant.



Related Terms

LOW HEAT VALUE

The heat value of a combustion process assuming that none of the water vapor resulting from the process is condensed out, so that its latent heat is not available. Also known as lower heating value; net heating value.

CONDENSER TUBES

Metal tubes used in a heat-transfer device, with condenser vapor as the heat source and flowing liquid such as water as the receiver.

BERTHELOT METHOD

A method of measuring the latent heat of vaporization of a liquid that involves determining the temperature rise of a water bath that encloses a tube in which a given amount of vapor is condensed.

HEAT OF SUBLIMATION

The increase in enthalpy accompanying the conversion of 1 mole, or unit mass, of a solid to a vapor at constant pressure and temperature. Also known as latent heat of sublimation.

LATENT HEAT

The heat required to cause a change in state of a substance from solid to liquid (latent heat of fusion) or from liquid to vapor (latent heat of vaporization). These phase changes occur without change of temperature at the melting point and boiling point, respectively.

LATENT HEAT OF VAPORIZATION

Quantity of heat to change the state of a substance from liquid to vapor (or vice versa) without change of temperature.

LATENT HEAT

The heat required to changes the state of liquid into a gas or vapor.

CONDENSATE

Condensed water resulting from the removal of latent heat from steam.

HEAT OF FUSION

The latent heat absorbed when a substance changes from a solid state to a liquid state.

BOILER

A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity, or nuclear energy. The term dose not include such facilities of an integral part of a continuous processing unit but does include fired units of heating or vaporizing liquids other than water where these units are separate from processing systems and are complete within themselves.

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