Exergetic and thermoeconomic analyses of diesel engine powered cogeneration: Part 1 – Formulations

Abuşoğlu, Ayşegül; Kanoğlu, Mehmet

doi:10.1016/j.applthermaleng.2008.02.025

Cited by 126 publications

(76 citation statements)

References 41 publications

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“…Recently, scroll-type compressors, which were used in this study, have been recommended due to their high efficiency values. [24,26] An alternative approach to this problem is using primary energy sources instead of electricity. Then the losses arising from energy conversion processes of electricity production can be recovered, and gas engine-driven heat pump systems have this advantage.…”

Section: Resultsmentioning

confidence: 99%

“…The only way to eliminate throttling loss would be to replace the capillary tube (the expansion device) with an isentropic turbine (an isentropic expander) and to recover some shaft work from the pressure drop. [24] HP systems are heat-generating devices that transfer heat from a low-temperature medium to a hightemperature one and are used in either hot water or space heating applications. HPs have been used mainly for space heating and water heating=cooling purposes, but many studies have progressed in its industrial applications, especially in dehumidification and in drying agricultural products, which are energy-intensive processes.…”

Section: Resultsmentioning

confidence: 99%

“…[17][18][19][20] Exergoeconomic analysis has been applied to various energy-related systems, such as the residential commercial sector, [21] thermal systems, [22] power plants, [17] combined cycle cogeneration plants, [23] and diesel engine-powered cogeneration. [24] Based on a literature survey, no studies have appeared on the exergoeconomic analysis of heat pump drying systems to the best of the authors' knowledge. This was the prime motivation in doing the present study, which applied the exergy, cost, energy, and mass (EXCEM) method to a heat pump system for drying of plums slices, and the performance assessment for each component of this system and the whole system was done using the exergy analysis method.…”

Section: Introductionmentioning

confidence: 99%

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Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

et al. 2010

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In this study, plum slices were dried in a heat pump dryer designed and constructed in Ege University, Izmir, Turkey. Drying experiments were carried out at an air temperature range of [45][46][47][48][49][50][51][52][53][54][55] C. The performance of the dryer along with its main components were evaluated using an exergy analysis method. Exergy destruction and capital cost rates were used for the exergoeconomic analysis, which is based on the quantities exergy, cost, energy, and mass (EXCEM) method. Exergy destruction rates to capital cost values R ex were obtained to vary between 1.668 and 2.063 W/ USD at different drying air temperatures. R en values were observed to range from 6.258 to 5.749 W/USD. R en values decreased as the drying air temperature increased, contrary to R ex values. _ R R ex and _ R R en values increased linearly with increasing temperature due to the loss, whereas _ R R en decreased due to the relatively higher energy utilization efficiency of the heat pump. In the compressor, _ R R en and _ R R ex values decreased with the increase in the temperature contrary to the other components. _ R R ex had the lowest value in the drying duct. However, in the compressor, expansion valve, and heat recovery, _ R R ex values were found to be higher and should be improved in these units.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

et al. 2010

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“…It helps the designers to optimize the design and the operation of the considered system in a cost effective way. Thus the purpose of the exergoeconomic analysis is multiple: -Evaluate the cost of production of each component; -Explicit the flow of costs in the system; -And find the optimum variables in a subsystem or the overall system by fixing an objective function [16]. Among the different exergoeconomic approaches existing in the literature, the SPECO approach [10] is used in this paper.…”

Section: Exergoeconomic Analysismentioning

confidence: 99%

Exergoeconomic analysis and optimization of a novel Isobaric Adiabatic Compressed Air Energy Storage system

Mazloum

2017

International Journal of Thermodynamics

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The contribution of the renewable energy sources in the electricity generation mix is greatly increasing. Nonetheless, the intermittence of these sources breaks the balance between supply and demand for electricity. Thus, the integration of the energy storage technologies with the electrical grid is becoming crucial to restore this balance. Hence, this paper discusses the modeling of a novel isobaric adiabatic compressed air energy storage (IA-CAES) system. This system is characterized by the recovery of the compression heat and the storage of the compressed air under fixed pressure in hydro-pneumatic tanks. This allows the improvement of the efficiency of the storage system. A steady state model is then developed to perform energy and exergy analyses of the IA-CAES system. An exergoeconomic model is also carried out in order to optimize the cost-effectiveness of the storage system by using a genetic algorithm. The system efficiency is 55.1% in the base case, it is improved to 56.6% after optimization with a decrease in the capital investment by 5.6%. Global sensitivity analyses are finally carried out to estimate the effects of some key parameters on the system's cost-effectiveness. They show that the system is mostly influenced by the isentropic efficiency of the air turbines.

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“…Cogeneration systems utilize the waste heat produced during electricity generation and apply it for heating purposes. Since cogeneration, or combined heat and power (CHP), systems produce both thermal energy (generally in the form of steam or hot water) and electricity, the first law efficiency can be increased from around 35% to 55% in conventional power plants to over 90% in CHP systems [1][2][3]. Reciprocating CHP units are generally applicable in low and medium power cogeneration units.…”

Section: Introductionmentioning

confidence: 99%

Exergy, Economic and Environmental Analysis for Simple and Combined Heat and Power IC Engines

et al. 2015

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This study reports the results of exergy, economic and environmental analyses of simple and combined heat and power internal combustion engines. Values of entropy production, second law efficiency are calculated, and an objective function, including initial, operation, maintenance and fuel costs, as well as the external costs of environmental pollutants, such as CO2, CO and NOx, are presented for the flue gas of the internal combustion engine. The results show that entropy generation in the combined heat and power mode is 30% lower than that in the simple internal combustion engine. Also, by excessively increasing the air ratio, the system entropy generation decreases in both cases of simple and combined heat and power IC engines. The greatest portion of entropy generation is related to the combined heat and power internal combustion engine. The gas heat exchanger generates more entropy than the jacket heat exchanger. Lower values of electricity cost and external costs of air pollution are provided by higher values of molar air to fuel ratio. The environmental aspects depend on location of the system and time of engine operation.

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Exergetic and thermoeconomic analyses of diesel engine powered cogeneration: Part 1 – Formulations

Cited by 126 publications

References 41 publications

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

Exergoeconomic Analysis of Plum Drying in a Heat Pump Conveyor Dryer

Exergoeconomic analysis and optimization of a novel Isobaric Adiabatic Compressed Air Energy Storage system

Exergy, Economic and Environmental Analysis for Simple and Combined Heat and Power IC Engines

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