Comparative exergetic performance analysis for certain thermal power plants in Serbia

Mitrović, Milica; Ignjatovic, G Marko; Stojanović, Vladimir; Janevski, N Jelena; Stojiljković, Mirko M.

doi:10.2298/tsci16s5259m

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…One such study showing the importance of exergy analysis for energy systems was carried out by Yıldızhan [4], who found that the exergy consumption of harvested crops was more remarkable than their calculated energy consumption. This finding is parallel to the research done by Mitrovic et al [5], who studied the performance of four thermal power plants from energetic and exergetic viewpoints. They found that exergy analysis results offered improved plant performance.…”

Section: Introductionsupporting

confidence: 76%

Improving the performance of a heating system through energy management by using exergy parameters

Tahsin

Hepbaşlı

2020

THERM SCI

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Energy management systems are used to analyze the efficiency of energy systems and identify any problem areas to lower costs and save energy, typically using energy based performance measurements. Our aim was to use exergy parameters, instead, to see if more accurate information could be obtained about which energy saving application would result in greater energy savings. Exergy analysis is based on the second law of thermodynamics and focuses on the environment and the quality of the energy. Implementing an exergetic approach to analyze a steam heating system, we examined data related to exergy flows and exergy losses, and ultimately improved the performance of the system through this energy management model. The following seven energy saving applications were identified and ranked according to their improvement potentials: adjusting the air to fuel ratio (1), preventing steam leaks (2), installing an automatic blow down system (3), insulating the pipes (4), insulating valves and flanges (5), insulating fuel tank (6) and recovering heat loss from the waste condensate (7). The optimum ranking obtained through the exergy analysis was 3-1-2-5-7-6-4. A reduction of 15.918 kW in exergy consumption was achieved by installing an automatic blowdown system. This meant a total reduction of 1,779.03 kg/year in total fuel consumption, $1,458.81/year of cost reduction and the total cost reduction achieved was $1,829.25/year. Making improvements to the seven selected areas in the system, 38.4% of the energy loss was recovered while the recovery in the exergy consumption was 44.5%.

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Section: Introductionsupporting

confidence: 76%

Improving the performance of a heating system through energy management by using exergy parameters

Tahsin

Hepbaşlı

2020

THERM SCI

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“…The 15% castor oil biodiesel in diesel resulted in optimum engine performance with improved thermal and exergetic efficiency [9]. The internal losses in any thermodynamic systems could not be evaluated by first law of thermodynamics [10,11]. The energy loss in thermal power equipments could not be evaluated based on only the first law of thermodynamics [12].…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis in diesel engine with binary blends

et al. 2022

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Investigation on diesel engine with minimized fuel consumption rate and increased output power is not the meaningful procedure if irreversibility in the thermodynamic system is ignored. This current procedure is aimed to signify the importance of exergy analysis in diesel engine performance on the perspective of Second law of thermodynamics analysis. In this study, diesel-cotton seed oil blends were tested on engine running with direct fuel injection mode of operation. The experiments were conducted with Diesel(D), 5% cotton seed oil-95% diesel(CB5), 10% cotton seed oil-90% diesel(CB10) and 15% cotton seed oil-85% diesel(CB15) for estimation of brake power, energy rate and exergy rate in the fuel and exhaust, heat release rate, exergy destruction, ideal efficiency (I law) and actual (II law) efficiency. The results outcome that an increase in trend was observed in the fuel exergy and thermal exergy loss with engine speed for D, CB5, CB10 and CB15. The loss of exergy, heat release rate, % of exergy and exergy transferred through exhaust gases decreased for CB5, CB10 and CB15 compared to diesel.

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“…The aim of the work [16] is to present how nature-inspired swarm intelligence (especially particle swarm optimization) can be applied in the field of power plant optimization and how to find solutions for the problems arising and also to apply exergoeconomic optimization technics on TPP. A comparative analysis of four TPP performances from the energetic and exergetic viewpoint has been conducted in [17]. Thermodynamic models of the plants are developed with primary objectives to analyze the system components separately and to identify and quantify the sites having largest energy and exergy losses.…”

Section: Introductionmentioning

confidence: 99%

Exergy efficiency analysis of lignite-fired steam generator

2018

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The operation of steam generators and thermal power plants is commonly evaluated on a basis of energy analysis. However, the real useful energy loss cannot be completely justified only by the First law of thermodynamics, since it does not differentiate between the quality and amount of energy. The present work aims to give a contribution towards identification of the sources and magnitude of thermodynamic inefficiencies in utility steam generators. The work deals with a parallel analysis of the energy and exergy balances of a coal-fired steam generator that belongs to a 315 MWe power generation unit. The steam generator is designed for operation on low grade coal-lignite with net calorific value 6280 to 9211 kJ/kg, in a cycle at 545 °C/177.4 bar, with feed water temperature 251 °C, combustion air preheated to 272 °C and outlet flue gas temperature 160 °C. Since the largest exergy dissipation in the thermal power plant cycle occurs in the steam generator, energy, and exergy balances of the furnace and heat exchanging surfaces are established in order to identify the main sources of inefficiency. On a basis of the analysis, optimization of the combustion and heat transfer processes can be achieved through a set of measures, including retrofitting option of lignite predrying with flue gas and air preheating with dryer exhaust gases.

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Comparative exergetic performance analysis for certain thermal power plants in Serbia

Cited by 3 publications

References 1 publication

Improving the performance of a heating system through energy management by using exergy parameters

Improving the performance of a heating system through energy management by using exergy parameters

Exergy analysis in diesel engine with binary blends

Exergy efficiency analysis of lignite-fired steam generator

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