Stirling engine

The heat Stirling engine (SB-Tedom V-183) is the most efficient thermodynamic cycle and it is a crucial device which converts heat energy into mechanical energy like combustion engines. Our Stirling engine is designed as a single-action α modification with closed-cycle double-cylinder reciprocating engine. The work cycle occurs only on one side of the pistons. This is quite a simple design that brings an acceptable production cost.

The engine's displacement is 183 cm3. Electrical output is 2 - 10kWe with measured engine efficiency 15% - 25%.
Optional thermal output is 9 - 25kWh.
The gaseous working fluid is the inert gas Helium and maximum mean pressure is 15 MPa.

During following years we are expecting further significant improving of operating and output parameters as well as economic benefits. A complete crankshaft mechanism with a crosshead and a piston rod is used to transfer the piston power. The crank case is designed as a non-pressurized unit. The crossheads transfer the normal forces and the pistons transfer the axial forces, which are necessary for the movement of the pistons with no lubrication. Only the lower part of the crankshaft mechanism is pressure-lubricated. The front cover houses an integrated gear pump, a reduction valve, a full-flow oil filter, and an oil cooler for the pressure-lubrication. Only 2 litres of oil are needed.

Almost all components are made of standard materials such as modular iron or steel. Great attention was dedicated to cylinder cooling equality for control heat deformations. Expensive refractory and heat resistant materials are only used on the hot side of the engine where necessary, where a combination of high thermal and mechanical loads occurs. The robust design of the crank case lowers the mechanical noise of the machine. The output of the engine is regulated via changes in the pressure of working gas. A compressor is used to control pressure level. The compressor piston is activated via an electromagnetic valve. A buffer increases the pressure after opening the electromagnetic valve. The cooler of the gaseous working fluid is designed as tubular so that the thermal expansion of the heater head can be compensated for increasing its lifetime through start-stop cycles.

Stirling Engine - R&D