What is the efficiency of a Stirling engine?
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].
How do you calculate the efficiency of a Stirling engine?
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 is the purpose of regenerator in Stirling engine?
The regenerator in a Stirling engine is an internal heat exchanger for transferring heat between a working fluid and a flow-channel wall (which is also part of the regenerator). The fluid can be helium or another gas that has suitable thermodynamic properties and that does not react chemically with engine components.
Is a Stirling engine more efficient?
Compared to an internal combustion engine of the same power rating, Stirling engines currently have a higher capital cost and are usually larger and heavier. However, they are more efficient than most internal combustion engines. Their lower maintenance requirements make the overall energy cost comparable.
Why are Stirling engines so inefficient?
Stirling’s original design involved a rather complicated double-piston mechanism that caused friction losses. Furthermore, the necessary heat exchangers reduce the efficiency in comparison to internal combustion engines.
What is the efficiency of Stirling cycle?
Dish Stirling systems have so far achieved the highest whole system, conversion efficiency from solar energy input to net electricity output, with the record being 29.4%.
How much energy can a Stirling engine produce?
generating between 200-500 watts of electricity. Several designs were studied before settling on an alpha type configuration based around a two-cylinder air compressor.
How much torque can a Stirling engine produce?
The maximum torque and power are 3.99 Nm and 183 W at 4 bars charge pressure and 533 K hot-end temperature. Stirling engine is an environmental friendly heat engine which could reduce CO2 emission through combustion process.
What are the advantages of a 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 a Stirling regenerator?
Regenerators are an internal heat exchanger that makes Stirling engines more efficient. A regenerator is a component in a Stirling engine that stores heat from one cycle so it can be used in the next cycle.
How does a Stirling engine work?
To operate as an engine, a Stirling engine needs to absorb heat, expand the gas, reject waste heat, and then compress or contract the gas. A regenerator works by storing some of the heat that would otherwise have to be rejected to the environment in the regenerator until the working gas flow reverses and the heat can be used in the next cycle.
What are the alternatives to the Stirling cycle?
Another alternative is the Fluidyne engine (Fluidyne heat pump), which uses hydraulic pistons to implement the Stirling cycle. The work produced by a Fluidyne engine goes into pumping the liquid. In its simplest form, the engine contains a working gas, a liquid, and two non-return valves.
What is the Stirling 1816 patent 4081 about?
The Stirling 1816 patent was also about an “Economiser”, which is the predecessor of the regenerator. In this patent (# 4081) he describes the “economiser” technology and several applications where such technology can be used. Out of them came a new arrangement for a hot air engine.
