Alpha stirling engine

An alpha type Stirling engine comprising:

• an expansion cylinder;
• a compression cylinder;
• a regenerator, a cooler, a heater, and a gas channel which provides the expansion cylinder in fluid communication with the compression cylinder;
• wherein at least one of the expansion cylinder and the compression cylinder has a twin cylinder which functions as an additional expansion cylinder or an additional compression cylinder, respectively, and wherein the one of the expansion cylinder and the compression cylinder that has the twin cylinder, is together with the twin cylinder connected to a first portion of the gas channel, from which the first portion of the gas channel extends via the regenerator to a second portion to which the other one of the expansion cylinder and the compression cylinder is connected;
• wherein the twin cylinder, the expansion cylinder and the compression cylinder each have a cylinder head having a surface proximal to the gas channel,
• wherein the twin cylinder is arranged in line with at least one of the expansion cylinder and the compression cylinder, with the surface of the respective cylinder heads facing each other.