A hot gas engine (1) comprising:
- a cylinder(2) extending in a longitudinal direction having a first end (3), a second end (4) and a longitudinal extending wall (5) between said first and second ends (3, 4) thereby defining a cylinder space, said cylinder (2) further provided with inlet (15, 17) and outlet (16, 18) openings for a working fluid to enter into and to be exhausted from said cylinder (2)
- a piston (6) located within said cylinder (2), said piston (6) adapted to be able to move back and forth within said cylinder (2) in the longitudinal direction and having a first surface (7) facing said first end (3) of said cylinder (2) thereby defining together with the longitudinal extending cylinder wall (5) a first cylinder chamber (9) within the cylinder (2), said piston (6) further having a second surface (8) facing the second end (4) of said cylinder (2) thereby defining together with the cylinder wall (5) a second cylinder chamber (10) within the cylinder
- a piston rod (11) having a first end (12) and a second end (13) wherein said first end (12) is connected to said piston (6), said piston rod (11) passing through said cylinder (2) through either said first or second end (3, 4) of the cylinder (2), and
- said first cylinder chamber (9) comprises a first inlet opening (15) provided with a first inlet valve (19) and a first outlet opening (16) provided with a first outlet valve (20), and
- said second cylinder chamber (10) comprises a second inlet opening (17) provided with a second inlet valve (21) and a second outlet opening (18) provided with a second outlet valve (22), wherein
- said first outlet opening (16) in the first cylinder space (9) is connected to said second inlet opening (17) in the second cylinder space (10) so as to allow a flow of working fluid from said first cylinder chamber (9) to said second cylinder chamber (10), and
- said engine (1) comprises an external heating chamber (23) connected by a third inlet opening (24) in the heating chamber (23) to said first outlet opening (16) in the first cylinder space (9) and a third outlet opening (25) in the heating chamber (23) is connected to said second inlet opening (17) in the second cylinder space (10) so as to allow a flow of working fluid from said first cylinder chamber (9) to said second cylinder chamber (10) via said heating chamber (23).
- said engine (1) is designed to transfer work from the piston rod (11) by an essentially only rectilinear movement of the piston rod (11).
- wherein
- the ratio between the maximum volume of the first cylinder chamber (9) and the maximum volume of the second cylinder chamber (10) is selected between 1:1.5 and 1:2.