Stirling And Ericsson Cycle Pdf

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Like Carnot cycle there are two other cycles that involve an isothermal heat-addition process at TH or T1 and an isothermal heat-rejection process at TL or T3 : the Stirling cycle and the Ericsson cycle. They differ from the Carnot cycle in that the two isentropic process are replaced by two constant-volume regeneration process in the Stirling cycle and by two constant-pressure regeneration process in Ericsson cycle.

Ericsson cycle

Stirling cycle and Rankine cycle heat engines are used to transform the heat energy of solar concentrators to mechanical and electrical energy. The Rankine cycle is used for large-scale solar power plants. The Stirling cycle can be used for small-scale solar power plants. The Stirling cycle heat engine has many advantages such as high efficiencyand long service life. However, the Stirling cycle is good for high-temperature difference. It demands the use of expensive materials.

The Stirling cycle is a thermodynamic cycle that describes the general class of Stirling devices. This includes the original Stirling engine that was invented, developed and patented in by Robert Stirling with help from his brother, an engineer. The irreversibility renders the thermal efficiency of these cycles less than that of a Carnot engine operating within the same limits of temperature. Another cycle that features isothermal heat-addition and heat-rejection processes is the Stirling cycle, which is an altered version of the Carnot cycle in which the two isentropic processes featured in the Carnot cycle are replaced by two constant-volume regeneration processes. The cycle is reversible, meaning that if supplied with mechanical power, it can function as a heat pump for heating or cooling , and even for cryogenic cooling.

Comparison of the Net Work Output between Stirling and Ericsson Cycles

The Ericsson cycle is named after inventor John Ericsson who designed and built many unique heat engines based on various thermodynamic cycles. He is credited with inventing two unique heat engine cycles and developing practical engines based on these cycles. His first cycle is now known as the closed Brayton cycle , while his second cycle is what is now called the Ericsson cycle. Ericsson is one of the few who built open-cycle engines, [1] but he also built closed-cycle ones. The following is a list of the four processes that occur between the four stages of the ideal Ericsson cycle:. The aforementioned irreversibility renders the thermal efficiency of these cycles less than that of a Carnot engine operating within the same limits of temperature.

The invention comprises a reversible heat engine intended to operate in the well known Stirling and Ericsson cycles. Engines designed according to the invention largely avoid the inherent losses which prevent prior machines from approaching the theoretically possible Carnot equivalent efficiency. Methods of modeling these complicated cycles are presented, the sources of inherent inefficiencies are identified, and methods of quantification and control are disclosed. A Stirling cycle heat engine generally consists of a variable volume sealed enclosure which contains a fixed quantity of a well behaved relatively ideal gas, typically helium. The enclosure is subdivided into two compartments by a gas permeable barrier which thermally isolates the two compartments from each other. The barrier is a porous medium made of very finely divided material which stores heat to and from gas passing through it.

Like Carnot cycle there are two other cycles that involve an isothermal heat-addition process at TH or T1 and an isothermal heat-rejection process at TL or T3 : the Stirling cycle and the Ericsson cycle. They differ from the Carnot cycle in that the two isentropic process are replaced by two constant-volume regeneration process in the Stirling cycle and by two constant-pressure regeneration process in Ericsson cycle. Both cycles utilize regeneration, a process during which heat is transferred to a thermal energy storage device called a regenerator during one part of the cycle and is transferred back to the working fluid during another part of the cycle. The execution of Stirling cycle requires rather innovative hardware. The actual Stirling engines, including the original one patented by Robert Stirling, are heavy and complicated. To spare complexities, the execution of the Stirling cycle in a closed system is explained with the help of the hypothetical engine shown below.


Abstract: In this paper, we compare Stirling and Ericsson cycles to Keywords: Stirling cycle; Ericsson cycle; heat engines; external heat.


Stirling and Ericsson Cycles 2016.pdf

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Thermodynamic cycle

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3 Response
  1. Laszlo C.

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  2. Joseph L.

    PDF | In this paper, we compare Stirling and Ericsson cycles to Keywords: Stirling cycle; Ericsson cycle; heat engines; external heat engines;.

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