What cycle does a Stirling engine use?
Table of Contents
What cycle does a Stirling engine use?
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.
How do you calculate Stirling cycle efficiency?
Efficiency of Stirling Cycle
- Work output = [RT1 ln(V2/V1) + CV(T1-T4)] – [CV(T2-T3) + RT3 ln(V3/V4)]
- Heat Input = RT1 ln(V2/V1) + CV(T1-T4)
- Efficiency = Work Output/Heat Input.
- After putting values of heat input and work output in the above formula, we get.
What are the process involved in 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 is Stirling engine work calculated?
The net work Wnet done over the cycle is given by: Wnet = (W3-4 + W1-2), where the compression work W1-2 is negative (work done on the system). We now consider the heat transferred during all four processes, which will allow us to evaluate the thermal efficiency of the ideal Stirling engine.
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) …
Why are Stirling engines not efficient?
Stirling engines are not good for applications that need to change their power output levels quickly, like cars for example. Stirling engines like to change their power output levels slowly. Plus, they tend to be heavier (and more expensive) than gasoline or diesel engines of a similar power output.
What is Stirling engine How it works?
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.
How does the Ericsson cycle work?
In Ericsson cycle heat is added and rejected at constant pressure. Also, compression and extension will take place at a constant temperature. Ericsson Cycle consists of a regenerator and a heat exchanger. In this cycle, a regenerator is used.
What are the four processes that make up the Ericsson cycle?
Ericsson cycle consists of four processes on a pressure- volume diagram, (1-2), rejection of heat constant pressure, (2-3), isothermal compression, (3-4), addition of heat at constant pressure and (4-1), isothermal expansion.
How do you calculate the work done by a Stirling engine?
How do you calculate Stirling engine power?
Power (W) = Net work/ kg (Work expansion/kg- Work Compression/kg) x mass of gas (kg/s) as discussed previously and not above the two choices mentioned.
How can you increase the efficiency of a Stirling engine?
(2) The methods in improving the performances of stirling engine includes: improving the hot end temperature, reducing the cold end temperature, increasing the average cycle pressure, speeding up the rotate speed, phase angle approximately being equal to 90 °and stro/e volume ratio approximately being equal to 1, etc.
Which one is advantage of Stirling engine?
The main advantages of Stirling engines are the ability to use various heat sources and combustion chambers meeting environmental requirements, a low level of noise and vibration; favorable characteristics for both vehicles and stationary electric generators, and good consistency with a linear electric machine.
What is the efficiency of a Stirling engine?
The thermal efficiency of Stirling engines is 40% while the efficiency of similar Otto and Diesel engines are 25 and 35%, respectively. The Stirling engine cycle is a closed regenerative thermodynamic cycle, with cyclic expansion and compression of the working fluid at various temperatures [7–11].
