Inadequate documentation in published life cycle energy reports on buildings

PurposeOver the past two decades, energy efficiency of building operation has increased significantly. As a result, the percentage of building life cycle energy attributed to embodied energy has also risen. This percentage, as measured in recent LCA studies, ranges between 2% and 51% and is influenced by the different climatic, infrastructure, and building characteristics that comprise the input data for these studies. Comparing the results of these studies is helpful in understanding how different combinations of these characteristics influence the relative proportions of embodied and operational energy. However, results are also influenced by the subjectivity inherent in each LCA study. Thus, meaningful comparison of results requires documentation of study methodologies, as outlined in ISO 14041.MethodsIn this paper, 20 journal articles describing LCA studies of buildings were reviewed for their adherence to key ISO 14041 documentation requirements.ResultsIt was found that the majority of journal articles have inadequate documentation.ConclusionsJournal articles are not subject to ISO 14041 requirements and, due to limitations in article length, some degree of documentation is necessarily omitted. However, since journal articles provide much of the publicly available data on the life cycle energy of buildings, a minimum degree of documentation should be provided to allow comparison between LCA results, without substantially increasing article length. Recommended documentation for journal articles that describe LCA studies of buildings, as proposed in this paper, includes: a list life cycle stages and unit processes included within the system boundary; a statement of calculation procedure; and the referencing of all data sources.

[1]  Xiaomin Yang,et al.  BEPAS—a life cycle building environmental performance assessment model , 2006 .

[2]  Christopher Kennedy,et al.  Comparing life cycle implications of building retrofit and replacement options , 2005 .

[3]  Justo Garcia Navarro,et al.  Assessment of the decrease of CO2 emissions in the construction field through the selection of materials: Practical case study of three houses of low environmental impact , 2006 .

[4]  Hans-Jürgen Dr. Klüppel,et al.  ISO 14041: Environmental management — life cycle assessment — goal and scope definition — inventory analysis , 1998 .

[5]  Steven Blanchard,et al.  Life Cycle Analysis of a Residential Home in Michigan , 1998 .

[6]  Brenda Vale,et al.  Life cycle analysis model for New Zealand houses , 2004 .

[7]  Catarina Thormark,et al.  A low energy building in a life cycle - its embodied energy, energy need for operation and recycling potential , 2002 .

[8]  Arto Saari,et al.  MIPS analysis of natural resource consumption in two university buildings , 2006 .

[9]  Catarina Thormark,et al.  The effect of material choice on the total energy need and recycling potential of a building , 2006 .

[10]  Gloria P. Gerilla,et al.  An environmental assessment of wood and steel reinforced concrete housing construction , 2007 .

[11]  Brian Norton,et al.  Life-cycle operational and embodied energy for a generic single-storey office building in the UK , 2002 .

[12]  P. Börjesson,et al.  Greenhouse gas balances in building construction : wood versus concrete from life-cycle and forest land-use perspectives , 2000 .

[13]  L. Gustavsson,et al.  Variability in energy and carbon dioxide balances of wood and concrete building materials , 2006 .

[14]  M. J. Holmes,et al.  Embodied and operational carbon dioxide emissions from housing: A case study on the effects of thermal mass and climate change , 2008 .

[15]  M. Optis,et al.  Incorporating life cycle assessment into the LEED Green Building rating system , 2008 .

[16]  Gregory A. Keoleian,et al.  Life cycle energy and environmental performance of a new university building: modeling challenges and design implications , 2003 .

[17]  Michiya Suzuki,et al.  Estimation of life cycle energy consumption and CO2 emission of office buildings in Japan , 1998 .

[18]  Zhuguo Li.  A new life cycle impact assessment approach for buildings , 2006 .

[19]  K. Adalberth,et al.  Energy use during the life cycle of buildings: a method , 1997 .

[20]  Raymond J. Cole,et al.  Life-cycle energy use in office buildings , 1996 .

[21]  G. Treloar,et al.  Life-cycle energy analysis of buildings: a case study , 2000 .

[22]  Raymond J. Cole,et al.  Energy and greenhouse gas emissions associated with the construction of alternative structural systems , 1998 .

[23]  Gjalt Huppes,et al.  Methods for Life Cycle Inventory of a product , 2005 .