Editing Stirling engine (section)

=== Flat engines ===
[[File:FlatStirlingEngine800x242.gif|thumb|400px|Cutaway of the flat Stirling engine:
10: Hot cylinder.
11: A volume of hot cylinder.
12: B volume of hot cylinder.
17: Warm piston diaphragm.
18: Heating medium.
19: Piston rod.
20: Cold cylinder.
21: A Volume of cold cylinder.
22: B Volume of cold cylinder.
27: Cold piston diaphragm.
28: Coolant medium.
30: Working cylinder.
31: A volume of working cylinder.
32: B volume of working cylinder.
37: Working piston diaphragm.
41: Regenerator mass of A volume.
42: Regenerator mass of B volume.
48: Heat accumulator.
50: Thermal insulation.
60: Generator.
63: Magnetic circuit.
64: Electrical winding.
70: Channel connecting warm and working cylinders.
]]

Design of the flat double-acting Stirling engine solves the drive of a displacer with the help of the fact that areas of the hot and cold pistons of the displacer are different.{{citation needed|date=July 2020}}

The drive does so without any mechanical transmission.{{citation needed|date=July 2020}} Using diaphragms eliminates friction and need for lubricants.{{citation needed|date=July 2020}}

When the displacer is in motion, the generator holds the working piston in the limit position, which brings the engine working cycle close to an ideal Stirling cycle.{{citation needed|date=July 2020}} The ratio of the area of the heat exchangers to the volume of the machine increases by the implementation of a flat design.{{citation needed|date=July 2020}}

Flat design of the working cylinder approximates thermal process of the expansion and compression closer to the isothermal one.{{citation needed|date=July 2020}}

The disadvantage is a large area of the thermal insulation between the hot and cold space.<ref name="WO2012062231" />