Describes an ideal process undergone by a gas in which no gain or loss of heat occurs.
Related Terms |
MOLLIER DIAGRAMA graphic method of representing the heat quantities contained in, and the conditions of, a liquefied gas (or refrigerant) at different temperatures. |
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.
|
