Thermodynamic System


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thermodynamic system

[¦thər·mō·dī′nam·ik ′sis·təm]
(thermodynamics)
A part of the physical world as described by its thermodynamic properties.

Thermodynamic System

 

an aggregation of physical bodies that may interact with each other and may exchange energy and mass with other bodies. Thermodynamic systems are the objects of study of thermodynamics.

A thermodynamic system consists of such a large number of particles that the system’s state may be characterized by macroscopic parameters—for example, density, pressure, and the concentrations of the various substances forming the system. If a system’s parameters do not vary with time and if there are no steady fluxes in the system (such as fluxes of heat or mass), the system is said to be in equilibrium (seeEQUILIBRIUM, THERMODYNAMIC). The concept of temperature as a state parameter having the same value for all macroscopic parts of the system is introduced for systems in equilibrium.

The properties of thermodynamic systems in thermodynamic equilibrium are studied by equilibrium thermodynamics, or thermostatics; the properties of nonequilibrium systems are studied by nonequilibrium thermodynamics. Thermodynamics deals with closed, open, adiabatic, and isolated systems. Closed systems do not exchange mass with other systems. Open systems may exchange mass and energy with other systems. Adiabatic systems do not exchange heat with other systems. Isolated systems exchange neither energy nor mass with other systems.

References in periodicals archive ?
Therefore discrete blocks (in a discrete brittle rock mass) or discrete clusters (in a plastic ground) are the natural components that comprise the ground volume as a thermodynamic system. It does mean that cooperation of these blocks and clusters is the way to create a well-organized in time and space structure due to the irreversible moving and deforming of the ground.
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An exergy analysis, based on both the first and second laws of thermodynamics, calculates the useful energy associated with a thermodynamic system or with each flow stream in a process.
Black hole is a simple object which can be described by only a few physical quantities, such as mass, charge, and angular momentum, while it is also a complicate thermodynamic system. Since the discovery of black hole's entropy [1], the four-thermodynamic law [2], and the Hawking radiation [3] in 1970s, thermodynamic of black hole has become an interesting and challenging topic.
They show how to describe each energy conversion device as an open thermodynamic system, and to assign efficiencies for the ideal converter as well as the realistic converter.
these two buildings will be built according to the thermal regulation rt2012, with a thermodynamic system for the heating / hot water production part, and an external thermal insulation to meet the objectives of the energy transition.
It is well known that, if taken as a thermodynamic system, the asymptotically flat black hole does not meet the requirements of thermodynamic stability due to its negative heat capacity.
Contract notice: Operation with large maintenance of the heating, domestic hot water, air treatment, ventilation and thermodynamic system of the commune of Chtillon (92320).
So the results show that the parameter [lambda] promotes the thermodynamic system to reach the stable state.
To illustrate, in the classic Gibbs equation for a simple one-level thermodynamic system, its `truth claims' involve no less than 11 specific restrictions, which makes it applicable only to a very limited set of contexts.
Recently, by considering the cosmological constant correspond to pressure in general thermodynamic system, namely,