The transformation of heat in an engine Page: 2 of 34
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL MEMORANDUM NO. 509.
THE TRANSFORMATION OF HEAT IN AN ENGINE.*
By Kurt Neumann.
1. The thermodynamic basis for rating heat engines.- The
production of work by a heat engine rests on the operation of
supplying heat, under favorable conditions, to a working fluid
and then taking it away.. The working fluid serves simply as a
' conveyor of energy: It must flow to the engine and then, after
its energy has been transformed, it" must be returned again to
the surroundings. As working fluids, steam and gases are em-
The goal of every technical process for obtaining work is
to secure the maximum amount of work Ln from a given quantity
of heat Q, and this by the simplest constructive device possi-
ble. The efficiency coefficient of the process is then,
The efficiency obtained at present in the utilization of heat
energy in engines is about 40%.
*Translation in part of Chapter 9, Volume XI, of Geiger and
Scheel's Handbuch der Physik, Julius Springer, Berlin, 1926.
This chapter deals with the transformation of heat in the engine.
The division of the chapter translated deals with those engines
whose operation is based on the liberation of chemical energy -
Internal Combustion Engines. The treatment of internal combus-
tion engines from the standpoint of classical thermodynamics is
important, for it forms a necessary introduction to their further
investigation that must include a consideration of. the thermody-
namics (and kinetics) of the gaseous explosive reaction on which
their operation depends.
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Neumann, Kurt. The transformation of heat in an engine, report, April 1929; (digital.library.unt.edu/ark:/67531/metadc279532/m1/2/: accessed August 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.