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The cooling of a gaseous refrigerant by first compressing it to liquid form (with resultant heat buildup), cooling the liquid by heat exchange, then releasing pressure to allow the liquid to vaporize (with resultant absorption of latent heat of vaporization and a refrigerative effect).



Related Terms

JET CONDENSER

A direct contact heat exchanger in which steam to be condensed comes into direct contact with the cooling water (cold condensate) which is usually introduced in the form of a spray from a jet.

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.

REFRIGERATION SYSTEM

A process using interconnected components that form a closed circuit in which refrigerant is circulated for the purpose of absorbing and then releasing heat for the purpose of cooling.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

COLD-AIR MACHINE

A refrigeration system in which air serves as the refrigerant in a cycle of adiabatic compression, cooling to ambient temperature, and adiabatic expansion to refrigeration temperature; the air is customarily reused in a closed superatmospheric pressure system. Also known as dense-air system.

DRAPER EFFECT

The increase in volume at constant pressure at the start of the reaction of hydrogen and chlorine to form hydrogen chloride; the volume increase is caused by an increase in temperature of the reactants, due to heat released in the reaction.

COOLING WATER

Circulated water that removes the heat from an internal combustion engine. Circulated water that removes the heat of compressing and condensing the refrigerant in refrigeration systems.

ABSORPTION CYCLE

In refrigeration, the process whereby a circulating refrigerant, for example, ammonia, is evaporated by heat from an aqueous solution at elevated pressure and subsequently reabsorbed at low pressure, displacing the need for a compressor.

ENDOTHERMIC

A process, which is accompanied by the absorption of heat.

MAXIMUM WORKING AREA

[INDENG] That portion of the working area that is readily accessible to the hands of a worker when in his normal states that the difference between the specific heat of a gas at constant pressure and its specific heat at constant volume is equal to the gas constant divided by the molecular weight of the gas.

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