Assessment of energy and exergy efficiencies in steam generators

Silva, Júlio Augusto Mendes da; Filho, Salvador Ávila; Carvalho, Mónica

doi:10.1007/s40430-016-0704-6

Cited by 24 publications

(14 citation statements)

References 26 publications

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“…The steam generator of the refrigeration system cannot utilize all the thermal energy contained in the exhaust gases of the ICE-irreversibilities occur, and therefore, its exergy efficiency is low. More details on the energy and exergy efficiencies of steam generators can be consulted in Silva et al [53].…”

Section: Resultsmentioning

confidence: 99%

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Marques

Carvalho

Lourenço

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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This study presents energy, exergy, and exergoeconomic assessments for a natural gas-fueled micro-trigeneration unit, which encompasses an internal combustion engine (ICE), an absorption refrigeration system (ammonia-water), and a heat recovery unit. The energy system is designed to meet the electricity and cooling demands of a university building, while heat is directed to a biodiesel plant located on site. The analyses comprehended energy and exergy parameters (first and second laws of thermodynamics). Then, the SPECO methodology was applied for the exergoeconomic assessment, which associates monetary values with exergy flows. The ICE presented the highest irreversibility (61.24 kW) and the highest cost of exergy destruction (21.56 BRL/h), followed by the steam generator (5.52 kW and 6.71 BRL/h, respectively). The exergoeconomic assessment indicated the components that could benefit from improvements: steam generator (cooling of exhaust gases before entry into the generator) and the heat exchanger of the absorber (substitution of the exchanger and/or pre-heating of input air). This study contributes to narrow the knowledge gap regarding the exergoeconomic assessment of compact trigeneration systems, besides making a case for the utilization of ICE as prime movers.

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Section: Resultsmentioning

confidence: 99%

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Marques

Carvalho

Lourenço

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…Whenever the kinetic and potential components of exergy are negligible, the total exergy is assessed by summing up its physical and chemical components, with the environment [35]. It was considered an environment (reference condition) in which T0 = 25ºC and P0 = 101.325 kPa.…”

Section: Exergy Analysis Methodologymentioning

confidence: 99%

Exergy evaluation and ORC use as an alternative for efficiency improvement in a CI-engine power plant

Silva

Morais

Tsolakis

et al. 2018

Sustainable Energy Technologies and Assessments

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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“…However, the ACC have achieved limited penetration in power plants, due to considerable compensation in terms of cost and performance, as they require a capital investment substantially greater than wet condensers because they incorporate larger heat exchangers, with huge fin areas and require additional support structures [8].…”

Section: Introductionmentioning

confidence: 99%

Use of Air Cooled Condenser in Biomass Power Plants: A Case Study in Cuba

Camaraza-Medina¹,

Escalona²,

Retirado-Mediaceja³

et al. 2020

IJHT

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A new project of investment developed in Cuba has 25 Biomass Power Plants (BPP) with potencies of 20 and 50 MW. The confirmed lack of water to be used in the condensers is an impediment for the project. The use of dry condensers may be a possible solution, however, the cost of the initial project and the reduction in useful power associated with its use is a limitation to consider. In order to define the feasibility of the use of ACC in these projects, a case study is carried out in which several selection criteria for investment alternatives are considered, with three other types of condensation technologies being evaluated with the objective of comparing costs of investment and operation, as well as the profits generated. The analyses were carried out for a horizon of 20 years, obtaining for the ACC uses, a pay off period of 7.6 and 8.4 years, for the facilities of 20 and 50 MW respectively. With the uses of the selection criteria for investment alternatives, was obtained that for facilities of 20 and 50 MW respectively, the Return Interest Rate (IRR) is 18.2 and 23,8 percent, the Net Present Value (NPV) (with 15% update rate) is equal to 1126.9 and 3024.0 MUSD, the cost of the life cycle is 10682.4 and 24406.1 MUSD, while, the levelized cost of electricity production is 0.062 and 0.071 USD/kWh, with a costbenefit ratio of 0.1 and 0.13. The results obtained confirm the feasibility of using ACC systems.

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Assessment of energy and exergy efficiencies in steam generators

Cited by 24 publications

References 26 publications

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Exergy evaluation and ORC use as an alternative for efficiency improvement in a CI-engine power plant

Use of Air Cooled Condenser in Biomass Power Plants: A Case Study in Cuba

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