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Pontifical Catholic University of Rio de Janeiro

1. VICTOR HUGO MARTINS MATOS SILVA. [en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS.

Degree: 2017, Pontifical Catholic University of Rio de Janeiro

[pt] O presente trabalho tem por objetivo analisar e comparar sistemas de trigeração (produção simultânea de eletricidade, aquecimento e refrigeração) de diferentes arquiteturas com base nas eficiências energética e exergética e nas emissões de CO2. Sistemas de trigeração são considerados mais eficientes na conversão de energia, se comparados a sistemas convencionais, devido ao reaproveitamento do calor de rejeito do motor térmico para outros fins (aquecimento, acionamento de chiller, ou geração de eletricidade). Quatro configurações (com chiller de compressão de vapor, com chiller de absorção, com a combinação dos ciclos anteriores, e combinado com um ciclo Rankine orgânico) foram estudadas a partir de modelos matemáticos resultantes dos balanços de energia e de exergia, e do cálculo de emissão de CO2 considerando as demandas energéticas (eletricidade, aquecimento e refrigeração) como independentes do desempenho do sistema. Todas as arquiteturas de trigeração aqui analisadas apresentaram um ponto ótimo de operação, onde o calor de rejeito recuperado para aquecimento se iguala à respectiva demanda. Neste ponto, o fator de utilização de energia (indicador de desempenho pela primeira Lei) e a eficiência exergética são máximos, e a emissão de CO2, mínima. A solução das equações resultantes mostrou também que a melhor arquitetura, do ponto de vista energético, exergético ou ambiental, dependerá da combinação das demandas energéticas.

[en] The present work aims at analyzing and comparing trigeneration systems (for the simultaneous production of electricity, heating and refrigeration) of different architectures based on energetic and exergetic efficiencies and on CO2 emissions. Trigeneration systems are regarded as more efficient in energy conversion, if compared to conventional systems, due to the recovery of waste heat from the heat engine. The waste heat is used for different purposes, including heating, chiller driving or electricity generation. Four trigeneration configurations (with vapor compression chiller, absorption chiller, with a combination of the two previous cycles, or combined with an organic Rankine cycle) were studied. Mathematical models resulting from the energy and exergy balances and from the calculation of CO2 emissions were developed taking into account that the three energy demands (electricity, heating and refrigeration) are independent from the trigeneration system performance. Solution of the resulting equations indicated an optimal point of operation, for all trigeneration architectures under study, where the waste heat recovered for heating equals the heating demand. At this point, the energy utilization factor (first Law indicator) and the exergy efficiency reach their maximum value, and the CO2 emissions, its lowest. Another important finding is that the configuration with best performance, from the energetic, exergetic, or environmental point of view, will depend on how the energy demands relate to each other.

Advisors/Committee Members: JOSE ALBERTO DOS REIS PARISE.

Subjects/Keywords: [pt] COGERACAO; [en] COGENERATION; [pt] TRIGERACAO; [en] TRI-GENERATION; [pt] CCHP; [en] CCHP; [pt] POLIGERACAO; [en] POLYGENERATION; [pt] TRI-GERACAO; [en] TRI-GENERATION

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

SILVA, V. H. M. M. (2017). [en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31637

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

SILVA, VICTOR HUGO MARTINS MATOS. “[en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS.” 2017. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed December 13, 2019. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31637.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

SILVA, VICTOR HUGO MARTINS MATOS. “[en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS.” 2017. Web. 13 Dec 2019.

Vancouver:

SILVA VHMM. [en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2017. [cited 2019 Dec 13]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31637.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

SILVA VHMM. [en] THERMODYNAMIC AND ENVIRONMENTAL ANALYSIS OF TRIGENERATION SYSTEMS BASED ON SYSTEM STRUCTURE AND ENERGY LOADS. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2017. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31637

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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