Conventional thermodynamic and advanced exergetic analysis of a refrigeration machine using a Voorhees’ compression process

Morosuk, Tatiana; Tsatsaronis, George; Zhang, Congyu

doi:10.1016/j.enconman.2012.02.021

Cited by 81 publications

(45 citation statements)

References 9 publications

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“…As regards the auxiliary compressor, this component can be equally enhanced by improving the compressor itself and the other components;  only half of the exergy destruction of the evaporator can be dropped. This result can be attained uniquely through the enhancement of the heat exchanger itself, accordingly with the results available in the open literature [27][28]39]. In accordance with the results by Bai et al [29], the closest attention has to be addressed to the main compressor at outdoor temperatures up to 40 °C.…”

Section: Discussionsupporting

confidence: 80%

“…The exogenous exergy destruction within the kth component (̇, ) are caused by the inefficiencies occurring in the other components [28,39,41]. This is evaluated by subtracting ̇, from ̇, as:…”

Section: Advanced Exergy Analysismentioning

confidence: 99%

“…The avoidable endogenous (̇, , ) and the avoidable exogenous exergy (̇, , ) destruction rates of the k-th component can be respectively dropped by decreasing the inefficiencies associated with the components themselves and by improving the remaining components [28,39,41]. In this paper, ̇ and ̇, in all the assessed cases were computed in the same way as Morosuk and Tsatsaronis [39], whereas the other fractions of the exergy destruction rate related to the k-th component were evaluated as follows:…”

Section: Advanced Exergy Analysismentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis

Gullo

Hafner

2017

International Journal of Thermodynamics

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Supermarkets are currently one of the most vital service facilities, whose number of installations is ever-growing in both developed and developing countries. On the other hand, these applications feature a copious indirect contribution to the ongoing climate change, as well as a massive use of potent greenhouse gases. In an attempt to promote climatefriendlier technologies in commercial refrigeration sector, "CO2 only" (transcritical CO2 or pure CO2) refrigeration systems have become the mainstream of new food retails worldwide. In particular, in the last few years parallel (or auxiliary) compression has taken root in food retails as a means to enhance the energy efficiency of pure CO2 units. The thermodynamic performance of such a promising solution can be suitably assessed with the aid of the advanced exergy analysis. The results obtained at the design outdoor temperature of 40 °C showed that the main compressor has the highest priority of enhancement, whereas the high-pressure expansion valve needs to be replaced with a device for expansion work recovery. Also, close attention had to be paid to both the gas cooler and the auxiliary compressor. The former can be improved mainly by enhancing the other components, whereas the irreversibilities related to the latter can be decreased by improving both the compressor itself and the remaining components. Finally, the implemented sensitivity analysis revealed that the improvement in the efficiency of the main compressor should be seriously considered on the part of the manufacturers.

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Section: Discussionsupporting

confidence: 80%

Section: Advanced Exergy Analysismentioning

confidence: 99%

Section: Advanced Exergy Analysismentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis

Gullo

Hafner

2017

International Journal of Thermodynamics

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“…The inlet and outlet temperature difference of the heat exchangers with fixed secondary working fluid is assumed to be DT ¼ 0 for the theoretical conditions. 32 All the conditions and assumptions of the simulated system process in the theoretical condition are shown in Table IV. The main thermodynamic parameters of each flow are listed in Table V. The hybrid I conditions, where only one component operates with real efficiency while all the remaining components correspond to the theoretical efficiency, operate based on the ideal efficiency.…”

Section: A Theoretical and Hybrid I Conditionsmentioning

confidence: 99%

Thermodynamic analysis of a compressed air energy storage system through advanced exergetic analysis

Hui

Saeed

2016

Journal of Renewable and Sustainable Energy

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Compressed air energy storage (CAES) is an economic, large-scale energy storage technology, but its further applications are limited by thermodynamic inefficiency. Although high-exergy destruction components can be highlighted through exergy analysis, the interactions among components and the true potential for the improvement of CAES are not obvious. In this study, an advanced exergy analysis was applied to the CAES system. The exergy destruction within each system component was split into four parts, namely, endogenous, exogenous, avoidable, and unavoidable. The thermodynamic properties of CAES were discussed in detail by combining the four parts. Results indicate that the unavoidable part of exergy destruction within the components of the system is larger than the avoidable part. The most important components based on the avoidable exergy destruction are combustion chambers, intercoolers, and aftercoolers. Exergy destruction can be significantly reduced by improving the main component efficiencies. More than half of the avoidable exergy destruction is exogenous, which indicates that interactions among components have a considerable impact on the CAES performance.

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“…In recent years, the thermoeconomics is still being used in other studies, mainly because of the environmental impacts and of the legal obligation to reduce emissions which leads the companies and businesses to use energy more efficiently in different systems (Solid-oxide fuel cells -SOFCs, Organic Rankine Cycle, Combined Heat and Power, Trigeneration, Polygeneration) and to use advanced exergetic or exergoenvironmental analyses [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Thermoeconomic Analysis of a Cogeneration System Integrated to a Solid Waste Incinerator

Higa¹,

Oliveira²,

Costa³

et al. 2014

Int. J. Thermo

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In order to achieve satisfactory incineration, it is required that the combustion reaction occurs in high temperature, resulting in gaseous components with high exergetic potential that can be used for electromechanical power generation. This study makes an exergetic analysis, feasibility study and thermoeconomic evaluation for implanting a cogeneration system integrated to a solid waste incinerator from the Biotery located in the State University of Maringa. First and Second Laws of Thermodynamics are employed, by applying mass, energy, exergy and economic balances of the proposed system. Based on this evaluation it is possible to verify that the integration of a Rankine cycle using a micro-turbine of 123 kW with the incinerator is technically viable. The power generation costs was estimated ~11% lower than from the supplier and the operational costs of the incineration can either be decreased in ~ 22% to present investment return in up to 4.2 years. These cost reductions could make possible the continuous operation of the equipment, supplying conditions for the correct disposal of the solid waste generated by the university and Maringa city.

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Conventional thermodynamic and advanced exergetic analysis of a refrigeration machine using a Voorhees’ compression process

Cited by 81 publications

References 9 publications

Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis

Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis

Thermodynamic analysis of a compressed air energy storage system through advanced exergetic analysis

Thermoeconomic Analysis of a Cogeneration System Integrated to a Solid Waste Incinerator

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