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Energy and exergy assessments for an enhanced use of energy in buildings

Gonçalves, Pedro
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
45.73%
Exergy analysis has been found to be a useful method for improving the conversion efficiency of energy resources, since it helps to identify locations, types and true magnitudes of wastes and losses. It has also been applied for other purposes, such as distinguishing high- from low-quality energy sources or defining the engineering technological limits in designing more energy-efficient systems. In this doctoral thesis, the exergy analysis is widely applied in order to highlight and demonstrate it as a significant method of performing energy assessments of buildings and related energy supply systems. It aims to make the concept more familiar and accessible for building professionals and to encourage its wider use in engineering practice. This thesis is divided into five main cases studies, which have different scopes and follow slightly different approaches but all with the same common objective. Case study I aims to show the importance of exergy analysis in the energy performance assessment of eight space heating building options evaluated under different outdoor environmental conditions. This study is concerned with the so-called “reference state”, which in this study is calculated using the average outdoor temperature for a given period of analysis. Primary energy and related exergy ratios are assessed and compared. Higher primary exergy ratios are obtained for low outdoor temperatures...

Ethanol production process from banana fruit and its lignocellulosic residues: Energy analysis

VELASQUEZ-ARREDONDO, H. I.; RUIZ-COLORADO, A. A.; Oliveira Junior, Silvio de
Fonte: PERGAMON-ELSEVIER SCIENCE LTD Publicador: PERGAMON-ELSEVIER SCIENCE LTD
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
55.64%
Tropical countries, such as Brazil and Colombia, have the possibility of using agricultural lands for growing biomass to produce bio-fuels such as biodiesel and ethanol. This study applies an energy analysis to the production process of anhydrous ethanol obtained from the hydrolysis of starch and cellulosic and hemicellulosic material present in the banana fruit and its residual biomass. Four different production routes were analyzed: acid hydrolysis of amylaceous material (banana pulp and banana fruit) and enzymatic hydrolysis of lignocellulosic material (flower stalk and banana skin). The analysis considered banana plant cultivation, feedstock transport, hydrolysis, fermentation, distillation, dehydration, residue treatment and utility plant. The best indexes were obtained for amylaceous material for which mass performance varied from 346.5 L/t to 388.7 L/t, Net Energy Value (NEV) ranged from 9.86 MJ/L to 9.94 MJ/L and the energy ratio was 1.9 MJ/MJ. For lignocellulosic materials, the figures were less favorable: mass performance varied from 86.1 to 123.5 L/t, NEV from 5.24 10 8.79 MJ/L and energy ratio from 1.3 to 1.6 MJ/MJ. The analysis showed, however, that both processes can be considered energetically feasible. (C) 2010 Elsevier Ltd. All rights reserved.; AUGURA association; DIME office; Biochemical Laboratory of the National University of Colombia; Bromatologic Laboratory of the National University in Colombia; Brazilian National Council of Scientific and Technological Development (CNPq)

Sustentabilidade energética de um sistema de produção da cultura de eucalipto; Energy sustainability of a production system of eucalyptus

Romanelli, Thiago Liborio
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 23/02/2007 PT
Relevância na Pesquisa
55.69%
O setor florestal apresenta grande importância econômica no Brasil, representando uma significativa parcela no PIB, nas exportações e na geração de empregos. As florestas fornecem matéria prima para a produção de energia ou celulose e são avaliadas, normalmente, por um enfoque econômico, que, isoladamente, não traz a sustentabilidade do setor. Para se avaliar a sustentabilidade, análises sistêmicas e de fluxo de material são algumas das alternativas. O fluxo de material fornece subsídios às metodologias que abordam os diversos aspectos da sustentabilidade, como por exemplo, a análise de energia, a síntese de emergia e análises integradas de aspectos sociais, econômicos e ambientais. Tendo em vista a importância da área florestal e a falta de estudos que permitam uma avaliação sistêmica dessa atividade, esse trabalho teve por objetivo avaliar a sustentabilidade energética de um sistema de produção. Para tanto, elaborou-se um modelo para determinar o fluxo de material, referente aos insumos utilizados indiretamente nas operações mecanizadas do sistema de produção: mão-de-obra, combustível e depreciação material do maquinário. Através desse modelo avaliou-se o cenário básico, que utiliza calcário na correção da acidez do solo e suas alternativas: cinzas e biossólido. Com base nesses resultados...

Incorporação de energia na vida útil de uma colhedora autopropelida de cana-de-açúcar; Energy embodiment in life cycle of a self-propelled sugarcane harvester

Mantoam, Edemilson José
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 23/11/2011 PT
Relevância na Pesquisa
55.65%
A questão energética é um dos principais desafios do século XXI. Por outro lado, os aspectos geopolíticos e ambientais, são fontes de preocupação para o modelo econômico atual. O Brasil é um país que apresenta vantagens em relação ao mundo em termos de utilização de fontes renováveis de energia. Desde 2007 os produtos da cana-de-açúcar assumiram o primeiro lugar na oferta de energia renovável. A análise de energia é necessária para o gerenciamento de recursos naturais limitados, para abastecer, com as mais diversas alternativas de biomassa, uma população mundial em constante crescimento. Essa análise identifica as práticas de produção e quantifica sua eficiência sob o ponto de vista energético, determinando a energia incorporada nas etapas do processo de produção. Estudos de energia incorporada em máquinas agrícolas são escassos. A participação do setor sucroalcooleiro na matriz energética do Brasil, fornecendo energia renovável a partir da biomassa tem aumentado. Devido à energia consumida no processo, ser produzida a partir dos seus próprios resíduos, avaliar as formas pelas quais a energia é demandada é vital para se determinar a viabilidade energética dessa fonte. Esse estudo visa determinar a energia incorporada em colhedora autopropelida de cana-de-açúcar. Foram avaliadas duas colhedoras...

Propostas de economia de energia em um sistema de refrigeração; Proposals for energy saving in a cooling system

Todeschini, Anderson
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Trabalho de Conclusão de Curso Formato: application/pdf
POR
Relevância na Pesquisa
55.52%
Nesse trabalho faz-se uma análise energética completa de um ciclo de refrigeração de uma cervejaria, determinando a carga térmica total, as temperaturas de evaporação e condensação e as curvas características dos equipamentos instalados. Com o auxílio de softwares como Coolpack e Excel e os dados levantados se determina a economia em cada proposta. A primeira proposta de economia é a divisão dos regimes de operação que oferece uma economia média de 3% na potência de compressão. A segunda proposta de economia é a escolha de temperaturas de condensação adequadas conforme as condições externas que oferece uma economia média de 8% na potência de compressão.; In this work it is a complete energy analysis of a refrigeration cycle of a brewery, determining the total heat load, temperatures of evaporation and condensation and the characteristic curves of the equipment installed. With the help of software such as Excel and Coolpack data collected and the economy is determined in each proposal. The first proposal is the system operation division that offers an average savings of 3% in power compression. The second proposal is the saving choice of suitable condensing temperatures as the external conditions that offers an average savings of 8% in power compression.

Support area as an indicator of environmental load: Comparison between Embodied Energy, Ecological Footprint, and Emergy Accounting methods

Agostinho, Feni; Pereira, Lucas
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 494-503
ENG
Relevância na Pesquisa
55.52%
Environmental aspects have been acknowledged as an important issue in decision making at any field during the last two decades. There are several available methodologies able to assess the environmental burden, among which the Ecological Footprint has been widely used due to its easy-to-understand final indicator. However, its theoretical base has been target of some criticisms about the inadequate representation of the sustainability concept by its final indicator. In a parallel way, efforts have been made to use the theoretical strength of the Emergy Accounting to obtain an index similar to that supplied by the Ecological Footprint. Focusing on these aspects, this work assesses the support area (SA) index for Brazilian sugarcane and American corn crop through four different approaches: Embodied Energy Analysis (SA(EE)), Ecological Footprint (SA(EF)), Renewable Empower Density (SA(R)), and Emergy Net Primary Productivity (SA(NPP)). Results indicate that the load on environment varies accordingly to the methodology considered for its calculation, in which emergy approach showed the higher values. Focusing on crops comparison, the load by producing both crops are similar with an average of 0.04 ha obtained by SA(EE), 1.86 ha by SA(EF)...

Avaliação energética e emergética de usina hidrelétrica - estudo de caso : complexo hidrelétrico de Belo Monte - Rio Xingu; Energy and emergy evaluation of hydroelectric power plant - a case study : Belo Monte hydroelectric complex - Xingu River

Mariana Marques Morelli
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 22/12/2010 PT
Relevância na Pesquisa
55.62%
A região Amazônica é bastante conhecida por sua riqueza em termos de biodiversidade e de potencial energético advindo de sua extensa rede hidrográfica. Após um vasto histórico de tentativas de barramento de um de seus importantes afluentes -o rio Xingu-, fez-se um projeto para a construção do chamado Complexo Hidrelétrico de Belo Monte (CHE). O principal objetivo deste estudo é apresentar uma metodologia para avaliar um empreendimento hidrelétrico sob os aspectos Energéticos e Ambientais, valendo-se da Análise Energética, que inclui uma avaliação dos fluxos de energia e de emergia. Nesta dissertação o CHE de Belo Monte foi analisado energeticamente, a partir de duas linhas conceituais: a termodinâmica e a emergia. Primeiramente buscou-se dados referentes ao investimento energético no sistema de produção de eletricidade. Em seguida, converteu-se os dados energéticos em exergia e multiplicou-se os resultados obtidos pelas respectivas transformidades: fontes de energia renovável "gratuita" (7,29E+05 sej/ano), fonte de energia renovável comprada (3,12E+03 sej/ano), fontes de energia não renovável comprada (1,39E+05), fontes de energia não renovável "gratuita" (9,40E+06 sej/ano), fontes de energia não renováveis comprada (1...

Net energy analysis in the Energy Research and Development Administration plan

Polenske, Karen R.
Fonte: MIT Energy Lab Publicador: MIT Energy Lab
Tipo: Trabalho em Andamento Formato: 5455418 bytes; application/pdf
EN_US
Relevância na Pesquisa
55.52%
Report prepared for the M.I.T. Energy Laboratory and the Office of Technology Assessment

Government support for the commercialization of new energy technologies : an analysis and exploration of the issues

Policy Study Group, MIT Energy Lab
Fonte: MIT Energy Lab Publicador: MIT Energy Lab
Tipo: Relatório Formato: 8000634 bytes; application/pdf
EN_US
Relevância na Pesquisa
55.63%
This report examines the issues associated with government programs proposed for the "commercialization" of new energy technologies; these programs are intended to hasten the pace at which target technologies are adopted by the private sector. The "commercial demonstration" is the principal tool used in these programs. Most previous government interventions in support of technological change have focussed on R&D and left to the private sector the decision as to adoption for commercial utilization; thus there is relatively little in the way of analysis or experience which bears direct application. The analysis is divided into four sections. First, the role of R,D&D within the structure of the national energy goals and policies is examined. The issue or "prices versus gaps" is described as a crucial difference of viewpoint concerning the role of the government in the future of the energy system. Second, the process of technological change as it occurs with respect to energy technologies is then examined for possible sources of misaligment or social and private incentives. The process is described as a series of investments. Third, correction of these sources of misalignment then becomes the goal of commercial demonstration programs as this goal and the means for attaining it are explored. Government-supported commercialization may be viewed as a subsidy to the introduction stage of the process; the circumstances under which such subsidies are likely to affect the success of the subsequent diffusion stage are addressed. The discussion then turns to the political...

Energy Demand Models for Policy Formulation : A Comparative Study of Energy Demand Models

Bhattacharyya, Subhes C.; Timilsina, Govinda R.
Fonte: Banco Mundial Publicador: Banco Mundial
Relevância na Pesquisa
45.71%
This paper critically reviews existing energy demand forecasting methodologies highlighting the methodological diversities and developments over the past four decades in order to investigate whether the existing energy demand models are appropriate for capturing the specific features of developing countries. The study finds that two types of approaches, econometric and end-use accounting, are used in the existing energy demand models. Although energy demand models have greatly evolved since the early 1970s, key issues such as the poor-rich and urban-rural divides, traditional energy resources, and differentiation between commercial and non-commercial energy commodities are often poorly reflected in these models. While the end-use energy accounting models with detailed sector representations produce more realistic projections compared with the econometric models, they still suffer from huge data deficiencies especially in developing countries. Development and maintenance of more detailed energy databases...

Solar project cost report for Irvine Elementary School, Irvine, California; Irvine Elementary School, Irvine, California

Mueller Associates (Baltimore, Md.); United States -- Dept. of Energy. -- Office for Conservation and Solar Applications; United States -- Dept. of Energy. -- Office of the Assistant Secretary for Conservation and Solar Applications; PRC Energy Analysis C
Fonte: Dept. of Energy, Office of Assistant Secretary for Conservation and Solar Applications; National Technical Information Service; Dept. of Energy, Office of Assistant Secretary for Conservation and Solar Applications ( Washington ); National Technical Information Service Publicador: Dept. of Energy, Office of Assistant Secretary for Conservation and Solar Applications; National Technical Information Service; Dept. of Energy, Office of Assistant Secretary for Conservation and Solar Applications ( Washington ); National Technical Information Service
Tipo: Artigo de Revista Científica Formato: 28 p. in various pagings : ; 28 cm.
Publicado em //1979 ENGLISH
Relevância na Pesquisa
65.59%
Apr. 11, 1979.; National solar data program.; National solar heating and cooling demonstration program.; MONTHLY CATALOG NUMBER: gp 80007819; (Statement of Responsibility) prepared for Department of Energy, Office of Assistant Secretary for Conservation and Solar Applications, National solar heating and cooling demonstration program, under contract number EG-77-C-01-2522 ; prepared by Mueller Associates, Inc., under subcontract to PRC Energy Analysis Company.

Solar project cost report for Page Jackson Elementary School, Charles Town, West Virginia; Page Jackson Elementary School, Charles Town, West Virginia

Mueller Associates (Baltimore, Md.); United States -- Dept. of Energy; PRC Energy Analysis Company
Fonte: Dept. of Energy; National Technical Information Service; Dept. of Energy ( Washington ); National Technical Information Service ( Springfield, Va ) Publicador: Dept. of Energy; National Technical Information Service; Dept. of Energy ( Washington ); National Technical Information Service ( Springfield, Va )
Tipo: Artigo de Revista Científica Formato: 27 p. : 28 cm.
Publicado em //1979 ENGLISH
Relevância na Pesquisa
55.52%
MONTHLY CATALOG NUMBER: gp 80007826; National Solar Heating and Cooling Demonstration Program.; National Solar Data Program.; Jan. 19, 1979.; (Statement of Responsibility) prepared for Department of Energy, Office of Assistant Secretary for Conservation and Solar Applications, National Solar Heating and Cooling Demonstration Program.

Solar project description for Reedy Creek Utilities, Co., Inc. office building; Reedy Creek Utilities Co., Inc. office building

PRC Energy Analysis Company; United States -- Department of Energy. -- Office of Conservation and Solar Applications; International Business Machines Corporation -- Federal Systems Division; Mueller Associates; Ehrenkrantz Group
Fonte: Dept. of Energy, Office of Conservation and Solar Applications; [For sale by the National Technical Information Service]; Dept. of Energy, Office of Conservation and Solar Applications ( [Washington] ); [For sale by the National Technical Information Service] ( [Springfield, Va.] ) Publicador: Dept. of Energy, Office of Conservation and Solar Applications; [For sale by the National Technical Information Service]; Dept. of Energy, Office of Conservation and Solar Applications ( [Washington] ); [For sale by the National Technical Information Service] ( [Springfield, Va.] )
Tipo: Artigo de Revista Científica Formato: iv, 44 pages : illustrations ; 28 cm.
Publicado em //[1980] ENGLISH
Relevância na Pesquisa
65.59%
National solar heating and cooling demonstration program.; National solar data program.; July 11, 1978.; (Statement of Responsibility) prepared for the Department of Energy, Office of Assistant Secretary for Conservation and Solar Applications, under contract number EG-77-C-01-2522, by PRC Energy Analysis Company, in cooperation with IBM Corporation, Federal Systems Division, Mueller Associates, Incorporated, the Ehrenkrantz Group.

Towards a Sustainable Global Energy Supply Infrastructure: Net Energy Balance and Density Considerations

KESSIDES, Ioannis N.; WADE, David C.
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf; digital
Relevância na Pesquisa
55.61%
This paper employs a framework of dynamic energy analysis to model the growth potential of alternative electricity supply infrastructures as constrained by innate physical energy balance and dynamic response limits. Coal- red generation meets the criteria of longevity (abundance of energy source) and scalability (ability to expand to the multi-terawatt level) which are critical for a sustainable energy supply chain, but carries a very heavy carbon footprint. Renewables and nuclear power, on the other hand, meet both the longevity and environmental friendliness criteria. However, due to their substantially di¤erent energy densities and load factors, they vary in terms of their ability to deliver net excess energy and attain the scale needed for meeting the huge global energy demand. The low power density of renewable energy extraction and the intermittency of renewable ows limit their ability to achieve high rates of indigenous infrastructure growth. A signi cant global nuclear power deployment, on the other hand, could engender serious risks related to proliferation, safety, and waste disposal. Unlike renewable sources of energy, nuclear power is an unforgiving technology because human lapses and errors can have ecological and social impacts that are catastrophic and irreversible. Thus...

Solar project description for Hogate's Restaurant; Hogate's Restaurant

PRC Energy Analysis Company; United States -- Dept. of Energy. -- Office of Conservation and Solar Applications; International Business Machines Corporation -- Federal Systems Division; Ehrenkrantz Group; Mueller Associates; Mueller Associates (Baltimore,
Fonte: Dept. of Energy; National Technical Information Service; Dept. of Energy ( Washington ); National Technical Information Service Publicador: Dept. of Energy; National Technical Information Service; Dept. of Energy ( Washington ); National Technical Information Service
Tipo: Artigo de Revista Científica Formato: iv, 35 p. : ill. ; 28 cm.
Publicado em //1979 ENGLISH
Relevância na Pesquisa
65.59%
May 9, 1978.; National solar data program.; National solar heating and cooling demonstration program.; MONTHLY CATALOG NUMBER: gp 80010092; (Statement of Responsibility) prepared for the Department of Energy, Office of Assistant Secretary for Conservation and Solar Applications, under contract number EG-77-C-01-2522, by PRC Energy Analysis Company, in cooperation with IBM Corporation, Federal Systems Division, Mueller Associates, Incoporated, The Ehrenkrantz Group.

Energy Considerations for Pipe Replacement in Water Distribution Systems

Prosser, MONICA
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
55.66%
Water utilities are facing pressure to continue to provide high-quality potable water in an increasingly energy constrained world; managing the ageing infrastructure that exists in many countries is a challenge in and of itself, but recently this has been coupled with political and public attention to the environmental impacts of the distribution system. Utility managers need to take a holistic approach to decision-making in order to determine all of the impacts of their plans. The intention of this thesis is to present a set of considerations for utility planners and managers to provide clarity to the trade-offs associated with any pipe replacement decision. This research has examined the energy relationships between operational energy reduction and the embodied energy tied to replacing deteriorated pipes in water distribution networks. These relationships were investigated through the development and application of a life-cycle energy analysis (LCEA) for three different pipe replacement schedules developed with the intent to reduce leakage in the system. The results showed that the embodied energy for pipe replacement is significant even when compared against the large amount of energy required to operate a large-scale water utility. The annual operational energy savings of between 8.9 and 9.6 million kWh achieved by 2070 through pipe replacement comes at a cost; 0.88-2.05 million kWh/mile for replacement with ductile iron pipes with diameters of 6” to 16” respectively. This imbalance resulted in a maximum energy payback period of 17.6 years for the most aggressive replacement plan in the first decade. Some of the assumptions that were used to complete the LCEA were investigated through a sensitivity analysis; specific factors that were numerically queried in this chapter include the break rate forecasting method...

Power system energy analysis incorporating comprehensive load characteristics

Jin, Ma; Hill, David; Dong, Zhao Yang; He, Renmu
Fonte: Institute of Engineering and Technology Publicador: Institute of Engineering and Technology
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
65.61%
The energy function method developed so far assumes that the active load is constant. However, most of the actual load is voltage dependent, which hinders the application of the energy analysis method to the actual power system. On the other hand, the fas

Boundary element dynamical energy analysis: a versatile method for solving two or three dimensional wave problems in the high frequency limit

Chappell, David J.; Tanner, Gregor; Giani, Stefano
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 20/02/2012
Relevância na Pesquisa
55.61%
Dynamical energy analysis was recently introduced as a new method for determining the distribution of mechanical and acoustic wave energy in complex built up structures. The technique interpolates between standard statistical energy analysis and full ray tracing, containing both of these methods as limiting cases. As such the applicability of the method is wide ranging and additionally includes the numerical modelling of problems in optics and more generally of linear wave problems in electromagnetics. In this work we consider a new approach to the method with enhanced versatility, enabling three-dimensional problems to be handled in a straightforward manner. The main challenge is the high dimensionality of the problem: we determine the wave energy density both as a function of the spatial coordinate and momentum (or direction) space. The momentum variables are expressed in separable (polar) coordinates facilitating the use of products of univariate basis expansions. However this is not the case for the spatial argument and so we propose to make use of automated mesh generating routines to both localise the approximation, allowing quadrature costs to be kept moderate, and give versatility in the code for different geometric configurations.; Comment: arXiv admin note: substantial text overlap with arXiv:1009.3769

Statistical energy analysis of nonlinear vibrating systems

Spelman, G. M.; Langley, R. S.
Fonte: Royal Society Publishing Publicador: Royal Society Publishing
Tipo: Article; accepted version
EN
Relevância na Pesquisa
65.61%
This is the author accepted manuscript. The final version is available from RSC via http://dx.doi.org/10.1098/rsta.2014.0403; Nonlinearities in practical systems can arise in contacts between components, possibly from friction or impacts. However, it is also known that quadratic and cubic nonlinearity can occur in the stiffness of structural elements undergoing large amplitude vibration, without the need for local contacts. Nonlinearity due purely to large amplitude vibration can then result in significant energy being found in frequency bands other than those being driven by external forces. To analyse this phenomenon, a method is developed here in which the response of the structure in the frequency domain is divided into frequency bands, and the energy flow between the frequency bands is calculated. The frequency bands are assigned an energy variable to describe the mean response and the nonlinear coupling between bands is described in terms of weighted summations of the convolutions of linear modal transfer functions. This represents a nonlinear extension to an established linear theory known as statistical energy analysis (SEA). The nonlinear extension to SEA theory is presented for the case of a plate structure with quadratic and cubic nonlinearity.; The authors would like to acknowledge the ?Engineering Nonlinearity? Program Grant...

Life cycle energy analysis of environmental management reports in the Japanese automotive industry: Learning from the Japanese experience

Mbohwa,C
Fonte: Journal of Energy in Southern Africa Publicador: Journal of Energy in Southern Africa
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2008 EN
Relevância na Pesquisa
55.61%
This paper discusses the assessment and comparison of the life cycle energy impacts of paper-based and electronic environmental reports in the Japanese automotive industry By January 2007, there were 129 031 ISO 14001 certified organisations and an additional 5389 certified to the European eco-management and audit scheme (EMAS). Energy use and the environmental burdens of environmental reporting by these companies, has grown and can no longer be ignored. Electronic systems are often portrayed as being more environmentally beneficial than traditional ones, for environmental reporting. However there are no known assessment methodologies that address this subject. This paper therefore creates a framework for analysing the two systems. Energy consumption models are developed within a life cycle assessment (LCA) framework and applied to the traditional and electronic systems respectively. A postal system model is developed for energy consumption in traditional mail distribution in Japan under six different scenarios. Data gaps in the Japanese automotive industry are compensated for by the use of justified assumption and sensitivity analysis of the variables concerned. Simulation results are analysed and some decision issues deciphered. A comparative analysis of electronic and traditional environmental reports identifies the necessary preconditions for reducing environmental burdens of the overall environmental management system (EMS).