Abstract: A scroll heating device includes a base, a reaction region, and a first and a second channel. The reaction region is at the center of the base. The two channels are located on the base and extend spirally from the reaction region toward the periphery of the base. The width of each channel is gradually reduced as the channel extends from adjacent to the center of the base toward the periphery of the base. The first channel allows a gas that flows into the first channel through the periphery of the base toward the center of the base to flow toward the reaction region at a progressively slower rate, enter the reaction region slowly through the gradually widening first channel, and therefore stay in the reaction region for longer. The combusted exhaust enters the second channel from adjacent to the center of the base and exits through the periphery of the base.

Abstract: A scroll heating device includes a base, a reaction region, and a first and a second channel. The reaction region is at the center of the base. The two channels are located on the base and extend spirally from the reaction region toward the periphery of the base. The width of each channel is gradually reduced as the channel extends from adjacent to the center of the base toward the periphery of the base. The first channel allows a gas that flows into the first channel through the periphery of the base toward the center of the base to flow toward the reaction region at a progressively slower rate, enter the reaction region slowly through the gradually widening first channel, and therefore stay in the reaction region for longer. The combusted exhaust enters the second channel from adjacent to the center of the base and exits through the periphery of the base.

Abstract: A regenerative displacer for use in a stirling engine includes two opposite covers with respective through openings, a body engaging the covers to define an accommodation space therein, a regenerator disposed in the accommodation space, and a rod inserted through the regenerator and one of the covers into a cooling portion of the stirling engine. The regenerator has a plurality of channels. Each channel has two open ends and a heat collecting net engaging each open end. Working gas passing through the regenerative displacer can be concentrated at the open ends and can absorb and release heat quickly because of the heat collecting nets, thereby increasing the efficiency of heat exchange and a temperature difference of the working gas in a thermodynamic cycle. Accordingly, pressure is increased to facilitate a quick reciprocation of a power piston of the stirling engine, and this increases output power and saves energy.