Is compressing a gas without removing or adding heat.


Related Terms

MOLLIER DIAGRAM

A graphic method of representing the heat quantities contained in, and the conditions of, a liquefied gas (or refrigerant) at different temperatures.
Used to calculate the cooling capacity of the cooling plant onboard liquefied gas carriers in relation to the reliquefaction plant and cargo carriage conditions. The main vertical and horizontal axes of the diagram are absolute pressure and enthalpy.

PLATE-TYPE EXCHANGER

Heat-exchange device similar to a plate-and-frame filter press; fluids flow between the frame-held plates, transferring heat between them.

PLATEN

1.A flat plate against which something rests or is pressed. 2. The rubber-covered roller of a typewriter against which paper is pressed when struck by the typebars. 2. A flat surface for exchanging heat in a boiler or heat exchanger which may have extended heat transfer surfaces.

PIPE STILL

A petroleum-refinery still in which heat is applied to the oil while it is being pumped through a coil or pipe arranged in a firebox, the oil then running to a fractionator with continuous removal of overhead vapor and liquid bottoms.

PHASE-CHANGE MATERIAL

A material which is used to store the latent heat absorbed in the material during a phase transition.

PECLET NUMBER

Dimensionless group used to determine the chemical reaction similitude for the scale-up from pilot-plant data to commercial-sized units; incorporates heat capacity, density, fluid velocity, and other pertinent physical parameters.

PASSIVE SOLAR SYSTEM

A solar heating or cooling system that operates by using gravity, heat flows, or evaporation rather than mechanical devices to collect and transfer energy.

PACKED TUBE

A pipe or tube filled with high-heat-capacity granular material; used to heat gases when tubes are externally heated.

OTTO CYCLE

A thermodynamic cycle for the conversion of heat into work, consisting of two isentropic phases interspersed between two constant-volume phases. Also known as spark-ignition combustion cycle.

ORDER OF PHASE TRANSITION

A phase transition in which there is a latent heat and an abrupt change in properties, such as in density, is a first-order transition; if there is not such a change, the order of the transition is one greater than the lowest derivative of such properties with respect to temperature which has a discontinuity.

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