An internal combustion engine system includes at least one combustor, a compressor arranged to compress air, an air guide arranged to guide compressed air from the compressor to at least one of the at least one combustor, an expander arranged to expand exhaust gases from at least one of the at least one combustor and to extract energy from the expanded exhaust gases, and an exhaust guide arranged to guide exhaust gases from at least one of the at least one combustor to the expander, wherein the exhaust guide is at least partly integrated with the air guide.

An internal combustion engine system includes at least one combustor, a compressor arranged to compress air, an air guide arranged to guide compressed air from the compressor to at least one of the at least one combustor, an expander arranged to expand exhaust gases from at least one of the at least one combustor and to extract energy from the expanded exhaust gases, and an exhaust guide arranged to guide exhaust gases from at least one of the at least one combustor to the expander, wherein the exhaust guide is at least partly integrated with the air guide.

To provide refrigeration below 200 K, a Brayton cycle engine contains a light reciprocating piston. The refrigerator includes a compressor, a gas-balanced reciprocating engine having a cold rotary valve, a counterflow heat exchanger, a gas storage volume with valves that can adjust system pressures, a variable speed engine and a control system that controls gas pressure, engine speed, and the speed of the piston. The engine is connected to a load such as a cryopanel, for pumping water vapor, through insulated transfer lines.

To provide refrigeration below 200 K, a Brayton cycle engine contains a light reciprocating piston. The refrigerator includes a compressor, a gas-balanced reciprocating engine having a cold rotary valve, a counterflow heat exchanger, a gas storage volume with valves that can adjust system pressures, a variable speed engine and a control system that controls gas pressure, engine speed, and the speed of the piston. The engine is connected to a load such as a cryopanel, for pumping water vapor, through insulated transfer lines.

An internal combustion engine having an independent combustion chamber comprises a combustion chamber (1), an air inlet system (2), a material feeding system (3), and a working system (4). The air inlet system (2) and the combustion chamber (1) are connected together and configured to transport a compressed air to the combustion chamber (1). The material feeding system (3) and the combustion chamber (1) are connected together and configured to transport a fuel to the combustion chamber (1). The combustion chamber (1) has a fixed volume and has no movable wall such as a piston. The fuel continues to be burned in the combustion chamber (1) to generate a high-temperature and high-pressure gas, and chemical energy of the fuel is converted into internal energy of the high-temperature and high-pressure gas. The working system (4) and the combustion chamber (1) are connected together. The piston (21) of the working system (4) works to convert the internal energy of the gas into a mechanical energy.

An internal combustion engine having an independent combustion chamber comprises a combustion chamber (1), an air inlet system (2), a material feeding system (3), and a working system (4). The air inlet system (2) and the combustion chamber (1) are connected together and configured to transport a compressed air to the combustion chamber (1). The material feeding system (3) and the combustion chamber (1) are connected together and configured to transport a fuel to the combustion chamber (1). The combustion chamber (1) has a fixed volume and has no movable wall such as a piston. The fuel continues to be burned in the combustion chamber (1) to generate a high-temperature and high-pressure gas, and chemical energy of the fuel is converted into internal energy of the high-temperature and high-pressure gas. The working system (4) and the combustion chamber (1) are connected together. The piston (21) of the working system (4) works to convert the internal energy of the gas into a mechanical energy.

A Stirling-cycle apparatus is provided comprising a hermetically sealable housing; a first rotary displacement unit in fluid communication with a second rotary fluid displacement unit, each operably mounted in a separate, fluidly sealed portion within said housing and adapted to provide a cyclic change of at least one thermodynamic state parameter of a working fluid during use. Furthermore, each one of said first and second rotary displacement unit comprises a compressor mechanism, having a first compressor working chamber that is adapted to receive a first portion of said working fluid, and at least a second compressor working chamber that is adapted to receive a second portion of said working fluid, said first compressor working chamber comprises a first outlet port and said second compressor working chamber comprises a second outlet port. Each one of said first and second rotary displacement unit further comprises an expander mechanism, having a first expander working chamber that is adapted to receive said first portion of said working fluid, and at least a second expander working chamber that is adapted to receive said second portion of said working fluid, said first expander working chamber comprises a first inlet port and said second expander working chamber comprises a second inlet port; a drive coupling assembly, adapted to operably and operatively couple said first expander mechanism to said first compressor mechanism. The drive coupling assembly further comprises a rotating valve mechanism, adapted to provide a predetermined sequence of a cyclic fluid exchange between said first compressor working chamber and said first expander working chamber, and between said second compressor working chamber and said second expander working chamber, at predetermined intervals of the angle of rotation of said first and second rotatory displacement unit. The Stirling-cycle apparatus further comprises an actuator, operably coupled to said first and second rotary displacement unit, and adapted to synchronously link the rotational movement of said first rotary displacement unit with said second rotary displacement unit, such that said first predetermined cyclic change of at least one thermodynamic state parameter of said working fluid is offset in relation to said second predetermined cyclic change of at least one thermodynamic state parameter of said working fluid by a predetermined phase angle, during use.

A Stirling-cycle apparatus is provided comprising a hermetically sealable housing; a first rotary displacement unit in fluid communication with a second rotary fluid displacement unit, each operably mounted in a separate, fluidly sealed portion within said housing and adapted to provide a cyclic change of at least one thermodynamic state parameter of a working fluid during use. Furthermore, each one of said first and second rotary displacement unit comprises a compressor mechanism, having a first compressor working chamber that is adapted to receive a first portion of said working fluid, and at least a second compressor working chamber that is adapted to receive a second portion of said working fluid, said first compressor working chamber comprises a first outlet port and said second compressor working chamber comprises a second outlet port. Each one of said first and second rotary displacement unit further comprises an expander mechanism, having a first expander working chamber that is adapted to receive said first portion of said working fluid, and at least a second expander working chamber that is adapted to receive said second portion of said working fluid, said first expander working chamber comprises a first inlet port and said second expander working chamber comprises a second inlet port; a drive coupling assembly, adapted to operably and operatively couple said first expander mechanism to said first compressor mechanism. The drive coupling assembly further comprises a rotating valve mechanism, adapted to provide a predetermined sequence of a cyclic fluid exchange between said first compressor working chamber and said first expander working chamber, and between said second compressor working chamber and said second expander working chamber, at predetermined intervals of the angle of rotation of said first and second rotatory displacement unit. The Stirling-cycle apparatus further comprises an actuator, operably coupled to said first and second rotary displacement unit, and adapted to synchronously link the rotational movement of said first rotary displacement unit with said second rotary displacement unit, such that said first predetermined cyclic change of at least one thermodynamic state parameter of said working fluid is offset in relation to said second predetermined cyclic change of at least one thermodynamic state parameter of said working fluid by a predetermined phase angle, during use.

A multifuel closed-loop thermal cycle piston engine, system and method. An externally-fired continuous combustion piston-driven engine configured to employ water injection post combustion to maintain a temperature of exhaust gas at a set point to form a closed-loop thermal cycle. A multifuel closed-loop thermal cycle piston engine includes a drive stage, a compression stage separate from the drive stage, the compression stage including a pressure-operated exhaust valve of a compression cylinder, an externally-fired continuous combustion chamber configured to conduct continuous combustion of a nonselective fuel, the combustion chamber comprising a water injection stage succeeding the fuel burner chamber, the water injection stage configured to inject water into the combustion chamber post-combustion, and wherein a quantity of water injected post-combustion is configured to maintain engine exhaust at or below a temperature set point.

The present disclosure envisages an engine operating on Jaypal cycle. The engine comprises a compressed air source. A combustion chamber is in fluid communication with the compressed air source and a fuel source, wherein the combustion chamber is configured to allow combustion of a fuel charge to produce combusted fuel charge. A first storage tank is in fluid communication with the combustion chamber, wherein the first storage tank is configured to store the combusted fuel charge, which is high pressure high temperature gas to perform work as per application requirements.