. Applied thermodynamics for engineers. Itsaction is illustrated in Fig. 105. G is the enginecylinder, containing the piston H, and receivingheated air through the pipe F from the vessel A which the air is alternately heated and vessel A A is made with hollow walls, the innerlining being marked aa. The hemispherical lowerportion of the lining is perforated; while from A Aup to CC the hollow space constitutes the regener-ator, being filled with strips of metal or glass. Theplunger E fits loosely in the machined inner shellaa. This plunger is hollow and filled with somenon-conduc
. Applied thermodynamics for engineers. Itsaction is illustrated in Fig. 105. G is the enginecylinder, containing the piston H, and receivingheated air through the pipe F from the vessel A which the air is alternately heated and vessel A A is made with hollow walls, the innerlining being marked aa. The hemispherical lowerportion of the lining is perforated; while from A Aup to CC the hollow space constitutes the regener-ator, being filled with strips of metal or glass. Theplunger E fits loosely in the machined inner shellaa. This plunger is hollow and filled with somenon-conducting material. The spaces DD containthe condenser, consisting of a coil of small copperpipe, through which water is circulated by a sepa-rate pump. An air pump discharges into the pipeF the necessary quantity of fresh air to compensatefor any leakage, and this is utilized in some casesto maintain a pressure which is at all stages con-siderably above that of the atmosphere. The furnace is built about the bottomABA of the heating Fig. 105. Arts. 260, 261, 262,263, 264. —Stirling Engine. 261. Action of the Engine. Let the plunger E and the piston H be in theirlowest positions, the air above E being cold. The plunger E is raised, causingair to flow from X downward through the regenerator to the space b, while Hremains motionless. The air takes up heat from the regenerator, increasing itstemperature, say to T, tvhile the volume remains constant. After the plunger has cometo rest, the piston H is caused to rise by the expansion produced by the absorptionof heat from the furnace at constant temperature, the air reaching H by passingaround the loose-fitting plunger E, which remains stationary. H now pauses inits up position, while E is lowered, forcing air through the regenerator fromthe lower space b to the upper space X, this air decreasing in temperature at con-stant volume. While E remains in its down position, H descends, forcing theair to the condenser D, the volume de
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