Le diagramme de Mollier (ou diagramme enthalpique) est un diagramme relatif aux fluides, Cycle d’un fluide Ra dans un Réfrigérateur à compression de vapeur. Les frigoristes utilisent des diagrammes enthalpiques pour y tracer le. DownloadDiagramme de mollier ra pdf. If you can then copy the data from the table and post here I d be forever in your debt I have moved from processing. CENTRE DE RECHERCHE RHÔNE-ALPES. Pression absolue. Absolute pressure (bar).

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Diagramme enthalpique — Wikipédia

Above the heavy line, the temperature is above the boiling point, and the dry superheated substance is gas only. The process 3—4 in a Rankine cycle is isentropic when the steam r134 is said to be an ideal one.

At first inspection, there may appear little resemblance between the charts, but if the user rotates a chart ninety degrees and looks at it r34a a mirror, the resemblance is apparent. An enthalpy—entropy chartalso known as the H — S chart or Mollier diagramplots the total heat against entropy, [1] describing the enthalpy of a thermodynamic system.

Commons category link is locally defined. The enthalpy coordinate is skewed and the constant enthalpy lines are parallel and evenly spaced.


On the diagram, lines of constant pressure, constant temperature and volume are plotted, so in a two-phase region, the lines of constant diargamme and temperature coincide. In other projects Wikimedia Commons. In an isenthalpic processthe enthalpy is constant.

Diagramme enthalpique

In general such charts do not show the values of specific volumesnor do they show the enthalpies of saturated water at pressures which are of the order of those experienced in condensers in a thermal power station. It can be used in practical applications such as maltingto represent the grain—air—moisture system.

Later the deviations from the ideal values and they can be calculated considering the isentropic efficiency of the steam turbine used. Views Read Edit View history.

A vertical line in the h—s chart represents an isentropic process. RaoThermodynamicsUniversities Press, p.

Retrieved from ” https: By using this site, you agree to the Terms of Use and Privacy Policy. In an isobaric processthe pressure remains constant, so the heat interaction is the change in enthalpy. So the expansion process in a turbine can be easily calculated using the h—s chart when the process is considered to be ideal which is the case normally when calculating enthalpies, entropies, etc.


The work done in a process on vapor cycles is represented by length of hso it can be measured directly, whereas in a T—s diagram it has to be computed using thermodynamic relationship between thermodynamic properties. This page was last edited on 24 Juneat Wikimedia Commons has media related to H-S diagrams.

The diagram was created inwhen Richard Mollier plotted the total heat [4] H against entropy S. At the Thermodynamics Conference held in Los Angeles it was decided to name, in his honor, as a “Mollier diagram” any thermodynamic diagram using the enthalpy as one of its axes. The underlying property data for the Mollier diagram is identical to a psychrometric chart.

Diagrammes des vapeurs des corps purs

The Mollier diagram coordinates are enthalpy h and humidity ratio x. Lines of constant dryness fraction xsometimes called the qualityare drawn in the wet region and lines of constant temperature are drawn in the superheated region.

Mlolier Wikipedia, the free encyclopedia.