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Waste Heat Recovery
Published in Tony Giampaolo, Gas Turbine Handbook: Principles and Practice, 2020
It should be noted that the Rankine steam cycle is also frequently depicted on the Mollier diagram. The Mollier diagram is a graphical representation of the thermodynamic properties and states of materials involving enthalpy, entropy, temperature, pressure and volume (see Figure 12-9). The Mollier diagrams are named after Richard Mollier (1863–1935), a professor at Dresden University who pioneered this graphical display. Mollier’s Enthalpy vs. Entropy (H-S) diagram is a graphical representation of the Steam Tables6 and a logical extension of the Temperature vs. Entropy (T-S) diagram. The advantages of the Mollier diagram are that vertical lines (entropy) represent reversible processes and horizontal lines (enthalpy) represent lines of constant energy. Mollier diagrams are routinely used in the design of power plants, heating and refrigeration systems and even wet steam production for tertiary oil recovery. These cycles are easily represented on H-S diagrams where work is calculated directly from vertical distances as opposed to areas on Temperature-Entropy (T-S) and Pressure-Volume (P-V) diagrams. Additionally, inefficiencies due to irreversibility in real processes are easily depicted on an overlay on the H-S diagram shown in Figure 12-9. While the Mollier Diagram for water/steam is the most common, Mollier diagrams exist for a multitude of materials (such as, ammonia, propane, pyridine, toluene and isopentane to mention just a few).
Understanding Mollier Diagram
Published in S. Bobby Rauf, Thermodynamics Made Simple for Energy Engineers, 2021
Mollier diagram is named after Richard Mollier (1863-1935), a German professor who pioneered experimental research on thermodynamics associated with water, steam and water-vapor mixture. Mollier diagram is a graphical representation of functional relationship between enthalpy, entropy, temperature, pressure and quality of steam. Mollier is often referred to as Enthalpy-Entropy Diagram or Enthalpy-Entropy Chart. The enthalpy-entropy charts in Appendix B are Mollier Diagrams. It is used commonly in the design and analysis associated with power plants, steam turbines, compressors, and refrigeration systems.
Properties and Value of Steam
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
A convenient alternative to using the steam tables is to use a Mollier diagram. A Mollier diagram is a graphic representation of the thermodynamic properties of steam. The ordinate “h” is enthalpy and the abscissa “s” is entropy. Using the graphical representation of the relationships of various steam conditions, computations made for analysis of various cycles and processes can be performed quickly with a fairly high degree of accuracy. Figures 6-5 (English units) and 6-6 (SI units) are Mollier diagrams for steam.
Artificial Bee Colony-Artificial Neural Network (ABC-ANN) Hybrid Algorithm’s Performance on the Modeling of Thermodynamic Properties of a Refrigerant Gas (R404a)
Published in Applied Artificial Intelligence, 2021
Modeling the thermodynamic behavior of a gas, depending on various parameters such as temperature, pressure, and volume, is one of the critical issues. The enthalpy and entropy values of the gas, under the predetermined operating conditions, are obtained from the H-S graph or the Mollier diagram. It is very effective to use modeling methods such as artificial neural networks in obtaining these values, which are very difficult to express mathematically for the wet or the super-heated region. Additionally, modeling is always used before any experimental testing to formulate new blends or to study the effect of changes in the composition, on the behavior and cooling performance (Doubek 2018).