What is Stirling cycle explain in detail?
A Stirling cycle engine is a closed cycle regenerative heat engine that operates by cyclically compressing and expanding a gaseous working fluid at different temperatures such that there is a net conversion of heat energy to mechanical work.
What is a Stirling engine and how does it work?
FEATURE OF STIRLING ENGINE Stirling engine is one kind of external combustion engine which converts thermal energy into kinetic energy by heating and cooling the working gas sealed in the cylinders. Thermal efficiency of Stirling cycle is as high as Carnot cycle which theoreticaly has the highest thermal efficiency.
Is Stirling cycle practical?
The Stirling and Ericsson cycles are not used to model real engines as they are difficult to achieve in practice. The advantage of both is that they can achieve efficiencies approaching the true Carnot efficiency. The Carnot cycle has a low mean effective pressure because of its very low work output.
How does a Stirling generator work?
Every Stirling engine has a sealed cylinder with one part hot and the other cold. The working gas inside the engine (which is often air, helium, or hydrogen) is moved by a mechanism from the hot side to the cold side. When the gas is on the hot side it expands and pushes up on a piston.
Where is Stirling cycle used?
Stirling engines are energy conversion devices that may be used as prime movers, refrigerating engines or heat pumps. Currently they are used commercially as cryogenic cooling systems and are under development as low noise, low emission automotive engines.
What is Stirling and Ericsson cycle?
Stirling and. Ericsson cycles are ideal thermodynamic cycles for external heat engines with regeneration, and both. are considered to have the Carnot efficiency as their theoretical efficiency, but they accomplish this using. different thermodynamic cycles, with isochoric (constant volume) and isobaric (constant pressure …
How does Stirling cycle used and applied in the engineering field?
Applications of the Stirling engine range from mechanical propulsion to heating and cooling to electrical generation systems. The Stirling cycle heat engine can also be driven in reverse, using a mechanical energy input to drive heat transfer in a reversed direction (i.e. a heat pump, or refrigerator).
Why don’t we use Stirling engines?
Stirling engines are rarely used for generating electricity. They are basically reciprocating engines and require fairly exotic alloys in their heat exchangers. Although in theory they are fairly efficient they are expensive and bulky.
What are the four processes that constitute the Stirling cycle?
The cycle is the same as most other heat cycles in that there are four main processes: compression, heat addition, expansion, and heat removal.
How does the Ericsson cycle work?
The Ericsson cycle is an altered version of the Carnot cycle in which the two isentropic processes featured in the Carnot cycle are replaced by two constant-pressure regeneration processes. The most well-known ideal cycle is the Carnot cycle, although a useful Carnot engine is not known to have been invented.
How is Stirling cycle different from Ericsson?
The main differences between them are the regeneration processes with two isochoric (constant volume) regeneration processes for the Stirling cycle and two isobaric (constant pressure) regeneration processes for the Ericsson cycle.
What is the Stirling cycle?
Stirling cycle was devised by Stirling, which consists of two isothermal processes and two constant volume processes. The last two processes are performed with the help of a refrigerator to make this cycle reversible. The p-v and t-s diagram of this cycle are shown in the figure. Let us now consider the four stages of the Stirling cycle.
What is a Stirling engine?
Stirling engine is a closed cycle regenerative heat engine. It works on either air or any other gas. Stirling cycle is invented by Robert Stirling with help from his brother (in 1816). Below are P-V and T-S Diagrams of the Stirling Cycle.
What is process 4-1 Stirling cycle?
Process 4-1 (Constant volume heating) Stirling cycle was devised by Stirling, which consists of two isothermal processes and two constant volume processes. The last two processes are performed with the help of a refrigerator to make this cycle reversible. The p-v and t-s diagram of this cycle are shown in the figure.
How do you calculate the efficiency of the Stirling cycle?
Efficiency of the Stirling Cycle is the ratio of work output to the heat input. η = 1 – [ (CV(T2-T3) + RT3 ln (V3/V4))/ (RT1 ln (V2/V1) + CV(T1-T4))] … (1) Since, Stirling cycle is a regenerative cycle hence heat rejected in process 2-3 is used for heat addition in process 4-1.