Practical limitations in Embodied Energy and Carbon measurements, and how to address them: a UK case study

The built environment is blamed for producing the majority of carbon emissions. While policy remains focused on emissions during the operational phase, research demonstrates that embodied impacts are a significant proportion of whole life ones. This paper presents a case study of a building that integrates low-energy design features. The study was carried out during the construction phase enabling superior quality of data to be collected. The cradle-to-grave embodied impacts were modelled to the TC350 Standards using an innovative tool, and the operational impacts through simulation, incorporating future climate predictions. In spite of the data quality, the study demonstrates a high level of uncertainty due to a number of industry-wide issues. This paper identifies these issues and concludes that considerable barriers to measuring embodied impacts remain. Key recommendations are made for industry and policy, in order to gear up the measurement and reduction of embodied impacts of buildings

Improved embodied energy and carbon accounting: recommendations for industry and policy

The majority of carbon emissions arise from the built environment, a fact which has led to a global policy focus on reducing carbon and energy from buildings in use. However, research demonstrates that embodied carbon is also an increasingly significant proportion of the whole life impacts from buildings. Embodied carbon is not yet the subject of regulation, and although the CEN TC350 standards provide a methodology, there remains a significant variation in its measurement. This paper investigates some of the issues and difficulties that need to be addressed before widescale regulation can be enforced. The investigation uses a detailed case study of a low-energy school building, studied during its construction phase. The cradle-to-grave embodied impacts were modeled to the TC350 Standards using an innovative tool, and the operational impacts were modeled to incorporate future climate predictions. In spite of the care taken over data collection and the collective support of the process from all stakeholders, the study demonstrates a high level of uncertainty in results, resulting from industry-wide barriers to embodied carbon measurement. Key recommendations are made for industry and policy, in order to overcome the current barriers and enable more accurate and comparable measurement of the embodied carbon of buildings.We would like to thank the stakeholders of the school: the architect Ms Daniela Muscat, the bursar of the school Mr Richard Brent, the contractor Mr Gareth Godfrey, the building services engineer Ms Sarah Leggo, and New World Timber Frame. We are grateful to the George and Marie Vergottis Foundation for financial support of Gavotsis during the period of this research at the University of Cambridge.This is the author accepted manuscript. The final version is available from the Athens Institute for Education and Research via http://www.athensjournals.gr/technology/2015-2-1-1-Gavotsis.pd

IEA EBC Annex 57 ‘Evaluation of Embodied Energy and CO_2eq for Building Construction'

The current regulations to reduce energy consumption and greenhouse gas emissions (GHG) from buildings have focused on operational energy consumption. Thus legislation excludes measurement and reduction of the embodied energy and embodied GHG emissions over the building life cycle. Embodied impacts are a significant and growing proportion and it is increasingly recognized that the focus on reducing operational energy consumption needs to be accompanied by a parallel focus on reducing embodied impacts. Over the last six years the Annex 57 has addressed this issue, with researchers from 15 countries working together to develop a detailed understanding of the multiple calculation methods and the interpretation of their results. Based on an analysis of 80 case studies, Annex 57 showed various inconsistencies in current methodological approaches, which inhibit comparisons of results and difficult development of robust reduction strategies. Reinterpreting the studies through an understanding of the methodological differences enabled the cases to be used to demonstrate a number of important strategies for the reduction of embodied impacts. Annex 57 has also produced clear recommendations for uniform definitions and templates which improve the description of system boundaries, completeness of inventory and quality of data, and consequently the transparency of embodied impact assessments

Improved embodied energy and carbon accounting: recommendations for industry and policy

The majority of carbon emissions arise from the built environment, a fact which has led to a global policy focus on reducing carbon and energy from buildings in use. However, research demonstrates that embodied carbon is also an increasingly significant proportion of the whole life impacts from buildings. Embodied carbon is not yet the subject of regulation, and although the CEN TC350 standards provide a methodology, there remains a significant variation in its measurement. This paper investigates some of the issues and difficulties that need to be addressed before widescale regulation can be enforced. The investigation uses a detailed case study of a low-energy school building, studied during its construction phase. The cradle-to-grave embodied impacts were modeled to the TC350 Standards using an innovative tool, and the operational impacts were modeled to incorporate future climate predictions. In spite of the care taken over data collection and the collective support of the process from all stakeholders, the study demonstrates a high level of uncertainty in results, resulting from industry-wide barriers to embodied carbon measurement. Key recommendations are made for industry and policy, in order to overcome the current barriers and enable more accurate and comparable measurement of the embodied carbon of buildings