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Using tables of thermodynamic variables (2)

Through an exercise, it is shown that in the absence of values for the compressed liquid, it is possible to substitute the values of saturated liquid at the same temperature.

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First law of thermodynamics (2)

To use simply the first principle génarélisé, a simplification of the derivative of the internal energy of the system is necessary. Two models are commonly used:

• evolution with steady flow (ERP), where the thermodynamic state of the system is assumed to be constant over time, without being uniform in the system: This model corresponds, for example in turbine operation in the long term
  
• evolution with uniform flow (USA), where the thermodynamic state of the system varies during the time but is uniform throughout the system: This model corresponds, for example filling a tank.

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First law of thermodynamics (1)

The third course has helped to establish the equation that governs the principle of conservation of energy in the general case of open systems. The proof is based on a systemic approach. In
stock exchanges energy must be taken into account, compared to a closed system, energy trade following:

• the energy carried by the incoming and outgoing masses,
• work flow related to mass transfer.

To simplify the writing of the equation, it adopted a change of variable h = u + Pv. We introduce the enthalpy.
Also note the presence in the equation of two entries in the internal energy:

• a total U shape (expressed in kJ) for the energy in the system at time t,
• une forme massique u (exprimée en kJ/kg), pour les masses traversant la frontière du système.

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Using tables of thermodynamic variables

A travers un exercice simple, il est abordé l'utilisation des tables de variables thermodynamiques sous l'angle de :

• la recherche de valeurs,
• l'interpolation linéaire.

L'interpolation linéaire permet de trouver des valeurs intermédiaires à celles présentes dans les tables. Cette méthode est basée sur l'hypothèse qu'entre deux points successifs de la table de variables thermodynamiques, il existe une relation linéaire.

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Introduction (2)

Dans ce deuxième cours, il was approached through an example:

• the discontinuous transition from the physical standpoint, in terms of thermodynamic properties (including the specific volume) when switching from a liquid phase to a vapor, the
• continuous transition, from a mathematical value characterizing the thermodynamic liquid-vapor mixture (including the specific volume of the mixture), when that one goes from a liquid to a vapor
  
• the concept of title, x, a liquid mixture of steam,
• simple search of information in the tables of thermodynamic variables. The course was

terminé par la démonstration du principe de conservation de la masse pour un système ouvert, dans une approche systémique.

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Introduction

Ce premier cours a pour objectif de poser les notions essentielles pour le développement du cours, de vérifier que les élèves possèdent ces connaissances et les significations physiques qui y sont rattachées.
La première partie a permis d'établir le principe de conservation de l'énergie pour un système fermé. La notion d'énergie interne est abordée et le fait qu'elle comprend l'énergie cinétique et l'énergie potentielle. Nous avons également adopté la convention de signe pour les échanges d'énergie : Positive when the system receives energy, negative when he gives.
In a second part, the open systeem are discussed and then it appears that the exchange of energy can also be done in the form of a mass exchange. This will lead us to establish a new equation for the principle of conservation of energy (next class). To clarify this notion of open system, the example of the power plant is discussed. It is noted that if the different components of the central thermiqe (boiler, turbine, condenser, pump, pipes) are open systems, the installation taken as a whole is a closed system.
In the third part, we distinguish between extensive quantities (volume, mass, energy) and intensive quantities (pressure, temperature). In the remainder of the course we will bring the extensive magnitudes in intensive magnitudes by dividing by the mass. To distinguish them from other quantities, the mass quantities will always be represented as lowercase letters.
To complete the course, he addressed the notion of state function, which are mathematically exact differential forms, which means physically that their variation does not depend on the path followed during processing. The Energy House is a state function. By cons, work and heat are not state functions.

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Heat

The concept of "heat" must be known.
Must also be known, the expression for the exchange of heat, for a change infinétisimale and reversible, according to the six coefficients calorimetry.
The site "Les Amphis de France 5" has, on this subject:

• a video course ,
• of commented exercises.
  

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properties of pure

The following concepts should be known:

• Representation the phase diagram (solid, liquid, vapor) in the variables P, v and T
• the triple point,
• the critical point,
• saturation curves.

• The projection of this diagram in the plane Pv for the part including the liquid and vapor phases

• move on isothermal
• calculate the title of a liquid- steam.

The site "Les Amphis de France 5" has, on this subject:

• a video course,
• commented exercises.

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Chewing gum, created by Fabrice Eveno, staging and music by Joseph Lecadre

We talk


surely ... "The story of silent magic eraser recounted by Fabrice Eveno, staging and music by Joseph Lecadre, goes well beyond the wonderful world of small. She asks. "These are the words of a journalist Ouest-France (IL, article published 21/06/05) employs to speak of this time spent with" chewing gum ".
Theatre gestures, music, poetry, almost like the days of silent film, grace the presence of more. This is said without words, which reads at the turn of a gesture, an expression, a musical punctuation, makes sense and becomes language giving rise to emotions that they will eventually into words, probably a little later.
"Beyond the gesture is a body in motion a world devoted to communication, a truly realistic drama that fills the silence. Without frustration. I never prohibits people from public speaking. Because there is nothing more beautiful than words to tell a story. "Valerie

Text from the West of France Tuesday, June 21, 2005, article written by IL

Thursday, May 24, Chez family FISCHER, 6 r Pervenches 44390 Petit Mars
Reservations: 02 40 72 79 63 or francois @ saint-krizambert.com
Entrance fee, participation greedy.

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It is confirmed, May 24, now it's on.

- Keski skonfirme?
- The show with the locals.
- Cékoi?
- Make an effort, remember. Mr. Krizambert would receive a mime of his friends in Lower Vigneau in Petit-Mars.
- Ah yes inmim.
- Well, last night Krizambert Thierry Fischer phoned to ask him if he agreed to receive Fabrice EVENO, Thursday, May 24
- And then?
- It is agreed and recalled Krizambert Fabrice EVENO to confirm.
- Keskifont Fabrice and Veno?
- IT'S A Mr. Mime, I'll hear about it soon but I've already brought pictures. Meanwhile reserve your evening.

Thursday, May 24, Chez family FISCHER, 6 r Pervenches 44390 Petit Mars
Reservations: 02 40 72 79 63 or francois@saint-krizambert.com