Dynamic energy and exergy analyses of an industrial cogeneration system

Yoru, Yilmaz; Karakoç, T. Hikmet; Hepbaşlı, Arif

doi:10.1002/er.1561

Cited by 31 publications

(14 citation statements)

References 19 publications

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“…Exergy is a measure of the maximum work that can be generated from a certain amount of energy or material [ 35 ]. Exergy analysis is favorable for improving the efficiency of energy-recourse usage because it quantifies the locations, types and magnitudes of wastes and losses, which accurately identifies the margins available for devising more-efficient energy systems through reducing inefficiencies [ 36 , 37 ]. The exergy of one steady matter flow (without regard to chemically bonded exergy) can be calculated as

where

donates the specific exergy of the matter flow (kJ/kg);

and

donate the specific enthalpies of the matter flow at the present state and environmental state (kJ/kg), respectively;

donates the environmental temperature (K);

and

donate the specific entropies of the matter flow at the present state and environmental state (kJ/kgK), respectively;

donates the total exergy of the matter flow (MW);

donates the flow rate of the matter flow (kg/s).…”

Section: System Simulation and Evaluation Criteriamentioning

confidence: 99%

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Chen

et al. 2019

Entropy

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High back-pressure (HBP) heating technology has been identified as an effective approach to improve the efficiency of combined heat and power (CHP). In this study, the novel concept of a HBP heating system with energy cascade utilization is developed and its probability examined. In the reformative design, the extracted heating steam from the intermediate-pressure turbine (IPT) is first drawn to an additional turbine where its excess pressure can be converted into electricity, then steam with a lower pressure can be employed to heat the supply water. As a consequence, the exergy destruction in the supply water heating process can be reduced and the efficiency of the cogeneration unit raised. A detailed thermodynamic investigation was performed based on a typical coal-fired HBP–CHP unit incorporating the proposed configuration. The results show that the artificial thermal efficiency (ATE) promotion was as much as 2.01 percentage points, with an additional net power output of 8.4 MW compared to the reference unit. This was attributed to a 14.65 percentage-point increment in the exergy efficiency of the supply water heating process caused by the suggested retrofitting. The influences of the unit power output, unit heat output, supply water and return water temperatures and turbine back pressure on the thermal performance of the modified system are discussed as well. In addition, the economic performance of the new design is assessed, indicating that the proposed concept is financially feasible.

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where

donates the specific exergy of the matter flow (kJ/kg);

and

donate the specific enthalpies of the matter flow at the present state and environmental state (kJ/kg), respectively;

donates the environmental temperature (K);

and

donate the specific entropies of the matter flow at the present state and environmental state (kJ/kgK), respectively;

donates the total exergy of the matter flow (MW);

donates the flow rate of the matter flow (kg/s).…”

Section: System Simulation and Evaluation Criteriamentioning

confidence: 99%

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Chen

et al. 2019

Entropy

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“…The exergy consumption occurred highest in the combustion chamber with a value of 129.61 kW. Yilmaz Yoru et al [6], performed energy and exergy analysis of a gas turbine based CHP system in a ceramic factory. Actual operational data taken over a onemonth period are utilized.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Evaluation and Optimization of Combined Heat and Power (CHP) Plant of 20.7 MW Capacities under Varying Load Conditions: A Case Study

Bapat¹,

Gokak²

2019

EJEE

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The main aim of this paper is to find the effect of power to heat ratio on exergy of Combined Heat and power (CHP) systems used in power plants. Lot of Energy Researchers have investigated and published their work in terms of energy efficiency and its parametric characteristics. But from a thermodynamic point of view it is Exergy and not Energy, which reveals a more meaningful performance of CHP system. In the present work a case study of a CHP system of 20.7 MW capacities is considered and analyzed based on varying load conditions as well as based on Exergy, based on experimental data taken from the plant. For 100 % PLF the optimum value of PHR in terms of TExDR and SSC is 0.546. Exergy analysis reveals that with a decrease in the value of PLF (plant load factor) the optimum value of PHR (power to heat ratio) also reduces.

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“…In the literature, Yoru et al analysed the energetic and exergetic efficiency of an industrial cogeneration system; Fersi and Mago et al assessed the economic performance of different DESs . In the study of Fersi et al, the DES is a CHP system with anaerobic digestion process of sewage sludge through which biogas could be produced to generate electricity and heat.…”

Section: Introductionmentioning

confidence: 99%

Modeling and daily operation optimization of a distributed energy system considering economic and energy aspects

2018

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Summary This paper presents a distributed energy system (DES) for a local district and formulates a constrained nonlinear multiobjective optimization model for the daily operation of the system. The main objective of the study is to increase the efficiency by minimizing energy cost, energy consumption, and energy losses. It is implemented through the integration and complementation of renewable energies and fossil fuels as well as the recycling utilization of waste heat in the DES. The consideration of network topology and energy losses of water heating network could also contribute to the improvement of energy efficiency. To solve the optimization problem, a novel Whale Optimization Algorithm is employed. Furthermore, the economic and energy performance of the DES are evaluated and compared with that of conventional centralized energy systems, ie, the EG and MG energy‐supply modes. After simulation studies, the hourly optimal energy (both natural gas and electricity) purchasing schedule as well as the hourly optimal set points of mass water flow rates and supply/return water temperatures could be determined. The results show that the DES saves more than 50% of energy costs/energy consumption than the MG mode and over 22% than the EG mode for a whole day, verifying the competitive advantage and great potential of both energy saving and cost reduction of the DES.

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Dynamic energy and exergy analyses of an industrial cogeneration system

Cited by 31 publications

References 19 publications

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Thermodynamic and Economic Analyses of Reformative Design for High Back-Pressure Heating in Coal-Fueled Cogeneration Units

Exergetic Evaluation and Optimization of Combined Heat and Power (CHP) Plant of 20.7 MW Capacities under Varying Load Conditions: A Case Study

Modeling and daily operation optimization of a distributed energy system considering economic and energy aspects

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