vapor cycle

vapor cycle

[′vā·pər ‚sī·kəl]
(thermodynamics)
A thermodynamic cycle, operating as a heat engine or a heat pump, during which the working substance is in, or passes through, the vapor state.

Vapor cycle

A thermodynamic cycle, operating as a heat engine or a heat pump, during which the working substance is in, or passes through, the vapor state. A vapor is a substance at or near its condensation point. It may be wet, dry, or slightly superheated. One hundred percent dryness is an exactly definable condition which is only transiently encountered in practice. See Heat pump, Thermodynamic cycle

A steam power plant operates on a vapor cycle where steam is generated by boiling water at high pressure, expanding it in a prime mover, exhausting it to a condenser, where it is reduced to the liquid state at low pressure, and then returning the water by a pump to the boiler (Fig. 1).

In the customary vapor-compression refrigeration plant, the process is essentially reversed with the refrigerant evaporating at low temperature and pressure, being compressed to high pressure, condensed at elevated temperature, and returned as liquid refrigerant through an expansion valve to the evaporating coil (Fig. 2). See Refrigeration

The Carnot cycle, between any two temperatures, gives the limit for the efficiency of the conversion of heat into work. This efficiency is independent of the properties of the working fluid. The Rankine cycle is more realistic in describing the ideal performance of steam power plants and vapor-compression refrigeration systems. See Carnot cycle, Rankine cycle

References in periodicals archive ?
For the new single engine turboprop aircraft Enviro Systems will design, certify, and manufacture the vapor cycle air conditioning system, cabin pressure control system, and different other components.
Employing approximately 150 employees, the company's key product offerings include electrically-driven vapor cycle systems and auxiliary power generation technology which delivers supplementary hydraulic power for commercial aircraft and military platforms.
This company, engaged in the design, manufacturing and sale of vapor cycle air conditioning, bleed air control and cabin pressure systems as well as related equipment and components, will become a new division of the Aircraft Systems segment.
Inspected the hell hole and found the vapor cycle unit smoking profusely; no flames or scorching noted.
AMT) of Englewood, CO, is the creator of FlyCool, a lightweight, all-electric, vapor cycle air conditioning system that is capable of 9500 Btu per hour and moving 350 cubic feet of air per minute--about the same as in a mid-sized automobile.
I should say that the point of the column was not that evaporative cooling is in any way equivalent to vapor cycle cooling in comfort performance.
Hamilton Sundstrand Corporation, a subsidiary of United Technologies Corp (NYSE:UTX), on Monday announced it has finalised plans and entered into a definitive contract to manufacture vapor cycle cooling systems with AVIC Electromechanical Systems Company Limited (AVIC EM), a subsidiary of Corporation of China (AVIC).
Vapor Cycle off may be selected to quickly isolate RADAR, IIS, ESM, CEC, MATT, MC and DP (the ACIS units are not interlocked with the vapor cycle).
Yunick's Hot Vapor Cycle technology as a form of HCCI.
Marlborough, MA), AN/APS-145 radar and Advanced Control Indicator Set displays from Lockheed Martin Naval Electronics & Surveillance Systems (Syracuse, NY), enhanced software, and a new vapor cycle cooling system.
In addition to higher efficiency and cost savings, another advantage that magnetic refrigeration systems have over conventional vapor cycle machines is the elimination, in many cases, of the hazardous materials used for heat transfer, such as chlorofluorocarbons (CFCs) and ammonia.
ADDISON, Texas -- Keith Products, a Meggitt group company, announced today that it has received a contract from Cessna to develop and provide a Vapor Cycle Cooling System for the Citation CJ4.