In this study, we present the structure and numerically predicted results of a new Stirling engine with a circular disk heat exchanger consisting of pin-fin arrays. The heater structure comprises the circular disk, an annular shroud plate, and a connecting ring. Square pin-fin arrays are carved into the circular disk's face. An annular shroud plate upper is attached to these tips. A cooler of similar shape is located under the displacer cylinder. The cooler structure consists of an annular shape disk, a shroud, and a connecting ring. Pin-fin arrays are carved into the inner face of the disk, as in the heater mentioned above. The shroud plate is attached to the tips of the pin-fin. The type of proposed experimental engine is called a "β configuration." The bore diameter of the displacer and power pistons is 100 [mm] with a 60 [mm] stroke. The operating pressure is 500 [kPa]. We carried out simple numerical predictions of the engine using first-order approximation methods. Adjusted one-way constant velocity was used as the representative velocity of oscillating flow. We obtained the indicated power by an ellipsoidal approximation method. we also calculated the fluid resistance of each part but disregarded all mechanical friction losses. The output power is obtained by the aforementioned indicated power and fluid-resistance losses. Our calculations show the output power of the engine becomes 1.0 [kW] when using helium, with the temperature of 773 [K] on the heating side and 298 [K] on the cooling side. In conclusion, we believe the Stirling engine described in this paper is appropriate for use with solar and biomass fuel. Also, the engine does not need any heat exchanger pipes to be connected at all, unlike the conventional Stirling engine.
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