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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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.

The diagram was created inwhen Richard Mollief 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.

On the diagram, lines of constant dd, constant temperature and volume are plotted, so in a two-phase region, the lines of constant pressure and temperature coincide. 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. In an isobaric processthe pressure remains constant, so the heat interaction is the change in enthalpy.


In an isenthalpic processthe enthalpy is constant. A vertical line in the h—s chart represents an isentropic process. The process 3—4 in a Rankine cycle is isentropic when the mol,ier turbine is said to be an ideal one.

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 diagrramme enthalpies, entropies, etc.

Enthalpy–entropy chart – Wikipedia

Later the deviations from the ideal values and they can be calculated considering the isentropic efficiency of the steam turbine used. 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.

Above the heavy line, the temperature is above the boiling point, and the dry superheated substance is gas only. 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.


Diagramme enthalpique

It can be used in practical applications such as maltingto represent the grain—air—moisture system. The underlying property data for the Mollier diagram is identical to a psychrometric chart.

At first inspection, there may appear little resemblance between the charts, but if the user rotates a chart ninety degrees and looks at it in a mirror, the resemblance is apparent. The Mollier diagram coordinates are enthalpy h and humidity ratio x. The enthalpy coordinate is skewed and the constant enthalpy lines are parallel and evenly spaced. From Wikipedia, the free encyclopedia.

RaoThermodynamicsUniversities Press, p. Retrieved from ” https: Commons category link is locally molleir. Views Read Edit View history. In other projects Wikimedia Commons.

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