Richard Mollier

Not to be confused with Molière.

Richard Mollier

Richard Mollier (30 November 1863, Triest – 13 March 1935, Dresden) was a German professor of Applied Physics and Mechanics in Göttingen and Dresden, a pioneer of experimental research in thermodynamics, particularly for water, steam, and moist air.

Mollier diagrams (enthalpy-entropy charts) are routinely used in the design work associated with power plants (fossil or nuclear), compressors, steam turbines, refrigeration systems, and air conditioning equipment to visualize the working cycles of thermodynamic systems.

The Mollier diagram (h-s chart) of enthalpy of moist air versus its water vapor content (h–x diagram) is equivalent to the Psychrometrics Chart commonly used in the USA and Britain.

Education and career

After attending Gymnasium (high school) in Triest, he commenced studies in mathematics and physics at the University of Graz (Austria), continuing at the Technische Fachschule München. He presented his first publications as an outside lecturer for Theoretical Mechanics. After a short stint in Göttingen, he succeeded Gustav Zeuner in 1897 as Professor of Mechanical Engineering at the Technischen Hochschule Dresden. His 1904 publication New Graphs for Technical Thermodynamics greatly simplified calculations involving thermodynamic processes. His New Tables and Diagrams for Water Vapor, first published in 1906, appeared in six further editions through 1932, as he updated it to reflect new developments.

Honors

At the 1923 Thermodynamics Conference held in Los Angeles, it was decided to name, in his honor, as a “Mollier graph” any thermodynamic diagram using the Enthalpy h as one of its axes. Example: the h–s graph for steam or the h–x graph for moist air.

Publications

• Die Entropie der Wärme (The Entropy of Heat) 1895
• Dampftafeln und Diagramme des Kohlendioxid (Vapor Tables and Diagrams for Carbon Dioxide) 1896
• Neue Diagramme zur Technischen Wärmelehre (New Graphs for Technical Thermodynamics) 1904
• Neue Tabellen und Diagramme für Wasserdampf (New Tables and Diagrams for Water Vapor) Berlin 1906

See also

• Psychrometrics

External links

• Publications by and about Richard Mollier
• Photo

Persondata
Name	Mollier, Richard
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Date of birth	1863
Place of birth
Date of death	1935
Place of death