Performance and optimization criteria for forward and reverse quantum Stirling cycles

Wu, Feng; Chen, L.; Sun, Fengrui; Chen, Wu; Zhu, Yumei

doi:10.1016/s0196-8904(97)10037-1

Cited by 65 publications

(25 citation statements)

References 11 publications

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“…Different activities were performed to determine the optimal performance of the Stirling hot air engine. The optimal relation between power output and efficiency was derived by Wu et al [16], considering the conservation of energy. The net power output (P) was found by dividing the net work output (W) by the cycle period (τ):…”

Section: Optimisation Of the Power Output And Efficiencymentioning

confidence: 99%

The Impact of Biogas Conversion Technology for Economic Development: A Case Study in Kilimanjaro Region

Mkiramweni

2012

ISRN Renewable Energy

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In Tanzania the overall performance of the country's social and economic development requires the minimization of the existing energy challenges. Currently, about 80% of Tanzanians live in rural areas, and 90% percent of the populations have no access to grid electricity but rely on fuel wood and charcoal, causing annual deforestation rates of about 500,000 hectares. This problem can be minimised, especially where there is potential, like Kilimanjaro region. However, the level of development of biogas in the region is low and no reliable data to show this effect quantitatively. The author here, therefore, attempts to fill the gap. He realizes that up to 0.5 giga m 3 of biogas could be produced daily, exceeding by far the 0.72 million m 3 required for cooking in the region. It was further observed that the energy required for small economic activity in the region is about 3.0 MWh, about 0.1% of the total energy that can be generated from agrowaste materials. The application of biogas in Kilimanjaro region is therefore technically feasible, socially acceptable, and economically viable, so sensitisation should therefore be enhanced and research conducted.

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Section: Optimisation Of the Power Output And Efficiencymentioning

confidence: 99%

The Impact of Biogas Conversion Technology for Economic Development: A Case Study in Kilimanjaro Region

Mkiramweni

2012

ISRN Renewable Energy

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“…Quantum heat engines are typically based on implementations of quantum Carnot, Otto [15], Brayton [16,17], Diesel [16,18] or Stirling cycles [19,20], with a succession of strokes that alternatively extract work and exchange heat with the hot and cold reservoirs. As a result the generation of work is an intermittent process.…”

Section: Introductionmentioning

confidence: 99%

Deep-subwavelength lithography via graphene plasmons

2017

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We propose a realization of a quantum heat engine in a hybrid microwave-optomechanical system that is the analog of a classical straight-twin engine. It exploits a pair of polariton modes that operate as out-of-phase quantum Otto cycles. A third polariton mode that is essential in the coupling of the optical and microwave fields is maintained in a quasi-dark mode to suppress disturbances from the mechanical noise. We also find that the fluctuations in the contributions to the total work from the two polariton modes are characterized by quantum correlations that generally lead to a reduction in the extractable work compared to its classical version.

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“…The FTT performance of refrigeration cycles has also been analysed by taking the cooling load and the coefficient of performance (COP) as the optimization objective in much work (e.g. Goktun, 1996;Wu et al, 1998;Bejan and Vargas, 1995;Wijeysundera, 1997). Erbay and Yavuz (1998) and Yavuz and Erbay (1998) have taken the cooling load density, defined as the ratio of cooling load to the maximum specific volume in the cycle, as the optimization objective and analysed the optimum performance of an idea reversible Stirling refrigerator, as well as Ericsson refrigerator free of heat transfer and any other irreversibilities.…”

Section: Introductionmentioning

confidence: 99%

Cooling load density characteristics of an endoreversible variable-temperature heat reservoir air refrigerator

Zhou

Chen

Sun

et al. 2002

Int. J. Energy Res.

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SUMMARYThe performance optimization of an endoreversible air refrigerator with variable-temperature heat reservoirs is carried out by taking the cooling load density, i.e. the ratio of cooling load density to the maximum specific volume in the cycle, as the optimization objective in this paper. The analytical relations of cooling load, cooling load density and coefficient of performance are derived with the heat resistance losses in the hot-and cold-side heat exchangers. The maximum cooling load density optimization is performed by searching the optimum pressure ratio of the compressor, the optimum distribution of heat conductance of the hot-and cold-side heat exchangers for the fixed total heat exchanger inventory, and the heat capacity rate matching between the working fluid and the heat reservoirs. The influences of some design parameters, including the heat capacitance rate of the working fluid, the inlet temperature ratio of heat reservoirs and the total heat exchanger inventory on the maximum cooling load density, the optimum heat conductance distribution, the optimum pressure ratio and the heat capacity rate matching between the working fluid and the heat reservoirs are provided by numerical examples. The refrigeration plant design with optimization leads to a smaller size including the compressor, expander and the hot-and cold-side heat exchangers.

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Performance and optimization criteria for forward and reverse quantum Stirling cycles

Cited by 65 publications

References 11 publications

The Impact of Biogas Conversion Technology for Economic Development: A Case Study in Kilimanjaro Region

The Impact of Biogas Conversion Technology for Economic Development: A Case Study in Kilimanjaro Region

Deep-subwavelength lithography via graphene plasmons

Cooling load density characteristics of an endoreversible variable-temperature heat reservoir air refrigerator

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