Heat Engines that Use a Gravitational Field
作者:
G. S. Kell,
期刊:
American Journal of Physics
(AIP Available online 1974)
卷期:
Volume 42,
issue 3
页码: 209-213
ISSN:0002-9505
年代: 1974
DOI:10.1119/1.1987649
出版商: American Association of Physics Teachers
数据来源: AIP
摘要:
In the ordinary steam engine both the recovery of work and changes of the working substance involve the motion of a piston. Two heat engines are described here in which the gravitational field permits a separation of these two aspects. The first machine evaporates a liquid (for example, water) in the heat source, condenses it in the sink, and work is obtained from a water wheel; this machine is easy to understand, though not very efficient. The second machine is a reversible one using a Carnot cycle, again separating volume changes of the working substance from the motion of a piston. Both machines require large vertical dimensions but may someday be feasible in the exploitation of geothermal energy.
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