Exergy Losses in the Szewalski Binary Vapor Cycle

Kowalczyk, Tomasz; Ziółkowski, Paweł; Badur, Janusz

doi:10.3390/e17107242

Cited by 24 publications

(12 citation statements)

References 32 publications

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“…Performed analysis has revealed that the Szewalski binary vapour cycle, has a great potential in the field of reducing the size of power units [1][2][3] and increasing the efficiency of waste heat utilization in power plants, which can be used particularly in design of generating units of great output power and, what is desirable, for many technical and economic reasons. Unfortunately, binary cycle in contrast to single steam cycle, brings some additional energy losses, especially during heat exchange between the cycles.…”

Section: Resultsmentioning

confidence: 99%

“…Cycle has been tested using four low boiling points fluids: ethanol, ammonia, propane and isobutane. Fluids were chosen, using literature data [3][4][5][30][31][32][33], as the most proper in this range of temperature.…”

Section: The Szewalski Binary Vapour Cycle With Waste Heat Regeneratimentioning

confidence: 99%

“…The most recent analysis of a thermodynamic and operational parameters of the Szewalski binary vapour cycle was performed by Kowalczyk et al [3], who presented the energy and exergy analysis of the Szewalski binary vapour cycle based on a model of a supercritical steam power plant. The energy analysis was used to conduct a preliminary optimization of the cycle; exergy losses analysis (second law efficiency) is employed to perform a study of heat-transfer processes, which are essential for hierarchical cycles.…”

Section: Introductionmentioning

confidence: 99%

“…The energy analysis was used to conduct a preliminary optimization of the cycle; exergy losses analysis (second law efficiency) is employed to perform a study of heat-transfer processes, which are essential for hierarchical cycles. They obtained the reduction of the 'cold end' of the turbine which is desirable from economic and technical standpoints [3]. Another analysis of thermodynamic and operational parameters of the Szewalski binary vapour cycle was performed by Ziółkowski et al [4].…”

Section: Introductionmentioning

confidence: 99%

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Exergy analysis of the Szewalski cycle with a waste heat recovery system

Kowalczyk¹,

Ziółkowski²,

Badur³

2015

Archives of Thermodynamics

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The conversion of a waste heat energy to electricity is now becoming one of the key points to improve the energy efficiency in a process engineering. However, large losses of a low-temperature thermal energy are also present in power engineering. One of such sources of waste heat in power plants are exhaust gases at the outlet of boilers. Through usage of a waste heat regeneration system it is possible to attain a heat rate of approximately 200 MW th , under about 90• C, for a supercritical power block of 900 MW el fuelled by a lignite. In the article, we propose to use the waste heat to improve thermal efficiency of the Szewalski binary vapour cycle. The Szewalski binary vapour cycle provides steam as the working fluid in a high temperature part of the cycle, while another fluid -organic working fluid -as the working substance substituting conventional steam over the temperature range represented by the low pressure steam expansion. In order to define in detail the efficiency of energy conversion at various stages of the proposed cycle the exergy analysis was performed. The steam cycle for reference conditions, the Szewalski binary vapour cycle as well as the Szewalski hierarchic vapour cycle cooperating with a system of waste heat recovery have been comprised.

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Section: Resultsmentioning

confidence: 99%

Section: The Szewalski Binary Vapour Cycle With Waste Heat Regeneratimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergy analysis of the Szewalski cycle with a waste heat recovery system

Kowalczyk¹,

Ziółkowski²,

Badur³

2015

Archives of Thermodynamics

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“…According to [36] and [37], specific exergy of any fluid stream can be defined by the following equation:…”

Section: Energy and Exergy Analysis Of Any Control Volumementioning

confidence: 99%

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

2018

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An energy and exergy analysis of the condensate pump from the marine steam propulsion system during the condensate leakage between pump stages is presented in this paper. Measurements from the steam propulsion system during exploitation were necessary for collecting all the data for the condensate pump analysis. Due to condensate leakage inside the pump casing, the producer specified condensate pressures at the pump outlet could not be obtained during the exploitation. Low condensate pressure at the pump inlet and condensate temperature slightly above the atmospheric significantly influences the pump exergy analysis. Increase in pump load resulted in an increase of pump energy and exergy losses and efficiencies. In the observed load range during the leakage, pump energy losses are between 19.88 kW and 24.78 kW, while pump energy efficiencies are between 11.12 % and 41.54 %. Pump exergy losses are slightly higher, while exergy efficiencies are slightly lower when compared to energy losses and efficiencies. During normal operation, without leakage, the pump energy efficiencies are from 5 % to 20 % higher in comparison with pump operation when the leakage occurs.

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Basic Thermodynamic Analyses of Hierarchical Systems

Bartnik

Kowalczyk

2021

Hierarchical Gas-Gas Systems

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Exergy Losses in the Szewalski Binary Vapor Cycle

Cited by 24 publications

References 32 publications

Exergy analysis of the Szewalski cycle with a waste heat recovery system

Exergy analysis of the Szewalski cycle with a waste heat recovery system

Energy and Exergy Analysis of the Condensate Pump During Internal Leakage from the Marine Steam Propulsion System

Basic Thermodynamic Analyses of Hierarchical Systems

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