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Development of a selfstarting and twice double Acting Alpha-Type Stirling Engine for Use with Heatsources of Low to Medium Temperatures.

  • ️Dipl.-Ing. Peter Fette

The graphs in the following figures are calculated with these overall dates.

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Fig. 1

Fig. 1

Legend of this drawing:

KW = crankshaft with flywheel,   KU1= lower crankgear, KU2= upper crankgear, M = clutch
H1 : Expansion cylinder, K1 : Compression cylinder of 1'st partial engine
H2 : Expansion cylinder, K2 : Compression cylinder of 2'nd partial engine
H3 : Expansion cylinder, K3 : Compression cylinder of 3'nd partial engine
H4 : Expansion cylinder, K4 : Compression cylinder of 4'nd partial engine
WH1 - WH4 : external heatexchangers for the hot cylinders H1 - H4
WK1 - WK4 : external cooler for the cold cylinders K1 - K4

RC regulator-cylinder (only sketched here for the cold cylinders K4 und K3. For detailed information see the section Power Control

The Regenerator tubes "R" between the hot "H" - and the cold "K"- cylinders are atonce counter flow heat exchangers.

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Fig. 2


Fig. 2  P-V diagram for partial engine "H1-K1" with isotherms TE=400 K , TC=300 K; working fluid is air;
       the inner (green) graph represents partial load with a control volume of 25% swept volume.

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Fig. 3


Fig. 3   2 P-V diagrams for partial engine "H1-K1", Pgas is for working fluid air;
        P is for working fluid air + water vapor

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Fig. 4a


Fig.4a  2 T-S diagrams for partial engine "H1-K1"; working fluid is air; the frames represent the ideal Stirling processes;
         the inner graph represents partial load with a control volume of 25% swept volume

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Fig. 4b


Fig.4b:  T-S diagram for partial engine "H1-K1"; working fluid is air + water-vapor, the peaks are due to numerical problem; see text.

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Fig. 4c


Fig.4c:  T-S diagram for partial engine "H1-K1"; working fluid is water-vapor only

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Fig. 5


Fig.5:  "DR1234"= torque of the twice double acting engine, "DREH12"= torque of 2 of these engines
         coupled with a Y = 135 degree crankshaft shift.

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Fig. 6


Fig.6:  2'nd method of heattransfer to the working fluid by heating or -as seen here- cooling the working liquid with separate heatexchangers; see text
         RC3 and RC4 are the controlvolume cylinders for power regulation.

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