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Subject = Embodied energy;
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Displaying Results 1 - 14 of 14 on page 1 of 1
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An embodied carbon and embodied energy appraisal of a section of Irish motorway constructed in peatlands
(2017)
Duggan, Alan R.; McCabe, Bryan A.; Goggins, Jamie; Clifford, Eoghan
An embodied carbon and embodied energy appraisal of a section of Irish motorway constructed in peatlands
(2017)
Duggan, Alan R.; McCabe, Bryan A.; Goggins, Jamie; Clifford, Eoghan
Abstract:
In addition to the customary drivers of cost and timely project delivery, embodied energy (EE) and embodied carbon (EC) have come to prominence in recent years as major design considerations in all aspects of large-scale road construction projects. An assessment of road construction necessitating the excavation or alteration of peat should consider the impact on carbon stored within the peat and the greenhouse gases potentially released. A methodology for calculating the environmental impact of constructing roads on peat is presented in this paper. Furthermore, the paper describes the application of this methodology (focusing on EE and EC calculations) to a case study; a section of the M6 motorway in Ireland for which excavate-and-replace was the ground improvement method (Scenario ER). A range of peat-related factors impacting on EE and EC estimates were examined, including materials, transport and machinery, as well as more unfamiliar factors such as peat drainage, drainage system...
http://hdl.handle.net/10379/6302
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Comparative Embodied Energy Analysis of a Steel and Concrete Structural System in Ireland
(2007)
Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit
Comparative Embodied Energy Analysis of a Steel and Concrete Structural System in Ireland
(2007)
Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit
Abstract:
Engineering building design focuses on optimising operational energy use and ignores the energy required to procure and construct a building. This energy, termed ‘embodied energy’, can be very significant when compared to operational energy. Therefore, it is important to minimise the embodied in buildings; this must be done at the design stage. This paper presents a comparative embodied energy analysis of two structural design solutions for a modern office building: one in concrete and one in steel. Process analysis is used to determine production, transport and construction energy requirements for all system components. Results indicate that the steel solution has more than two and a half times as much embodied energy as the concrete solution.
https://arrow.dit.ie/dubencon2/66
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Defining Zero Energy Buildings - A life cycle perspective
(2012)
Hernandez, Patxi; Kenny, Paul
Defining Zero Energy Buildings - A life cycle perspective
(2012)
Hernandez, Patxi; Kenny, Paul
Abstract:
PLEA 2008 – 25th Conference on Passive and Low Energy Architecture, Dublin, 22nd to 24th October 2008
A simple definition of a zero energy building (ZEB) is a stand-alone building which does not use any offsite energy source for its operation. The definition is easily extended to buildings with a net-zero annual on-site energy balance, where a building is connected to the electricity grid and annual energy use is the same as energy exported to the grid. In this paper we expand the ZEB definition adding a life cycle perspective including the embodied energy (cradle to site) of materials, which is considered as an additional off-site supply. The consideration of embodied energy adds a level that will help discern the life cycle benefits of different demand or supply side building design strategies to achieve ZEBs. Calculations of operational energy use and embodied energy for different house design options are presented, analyzing what options would move closer to this ZEB definit...
http://hdl.handle.net/10197/3771
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Embodied Energy Analysis: a Sustainable Construction Design Assessment Tool
(2009)
Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit
Embodied Energy Analysis: a Sustainable Construction Design Assessment Tool
(2009)
Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit
Abstract:
Embodied energy analysis can be used as a construction design assessment tool in a sustainable matrix for a building. Its implementation however remains challenging mainly because of data measurement errors. A comparison between the deterministic embodied energy (EE) of a building and the stochastic EE of the same building undertaken using Monte Carlo simulation showed a wide variation in results. It is recommended that the specification of EE intensity of building materials in the construction industry can assist in producing accurate and more credible EE values of building.
https://arrow.dit.ie/dubencon2/4
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Factors affecting Embodied Carbon/Embodied Energy associated with ground improvements techniques for construction on peat
(2017)
Duggan, Alan R.; McCabe, Bryan A.; Goggins, Jamie; Clifford, Eoghan
Factors affecting Embodied Carbon/Embodied Energy associated with ground improvements techniques for construction on peat
(2017)
Duggan, Alan R.; McCabe, Bryan A.; Goggins, Jamie; Clifford, Eoghan
Abstract:
In addition to the traditional drivers of cost and timely programme delivery, embodied energy (EE) and embodied carbon (EC) have emerged as major considerations in all aspects (including geotechnical) of large construction projects. Foundation engineers are beginning to undertake comparisons of the EE/EC associated with various piling and ground improvement options as part of an overall appraisal of scheme feasibility. Where construction involves the modification or removal of peat, these calculations become more challenging as allowances should be made for the impact on the carbon stored within the peat and the gases potentially released from peat. Using a calculator developed at NUI Galway, research is underway to consider the EE/EC associated with piling, soil-mixing and excavate-and-replace—options that can facilitate road/motorway construction on peat. Several high-profile motorway projects in Ireland will provide data for the analysis. Also, with the help of scientists present...
http://hdl.handle.net/10379/6340
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Land use Planning in Ireland: a Life Cycle Energy Analysis of Recent Residential Development in the Greater Dublin Area
(2009)
Duffy, Aidan
Land use Planning in Ireland: a Life Cycle Energy Analysis of Recent Residential Development in the Greater Dublin Area
(2009)
Duffy, Aidan
Abstract:
Background, aim, and scope: One third of the total housing stock in the Republic of Ireland has been built in 10 years up to and including 2006 and of this approximately 34% was built in the Greater Dublin Area (GDA). Much of the housing was low-density with poor public transport links leading to doubts over its sustainability—particularly in terms of energy use. Although the country is committed to reducing greenhouse gases to 13% above 1990 levels by the period 2008–2012, by 2005, emissions were already 25.4% higher than the aseline and current projections are that this figure will rise to 37% over the period. The residential sector is estimated to contribute to approximately 24.5% of energy-related CO2 emissions. This paper estimates total emissions from residential developments in the GDA constructed between 1997 and 2006. Materials and methods: Carbon dioxide equivalent (CO2) emissions are estimated using a life cycle assessment approach over a 100-year building lifespan and em...
https://arrow.dit.ie/engschcivart/12
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Life Cycle Energy Performance: Exploring the limits of passive low energy buildings
(2012)
Hernandez, Patxi; Kenny, Paul
Life Cycle Energy Performance: Exploring the limits of passive low energy buildings
(2012)
Hernandez, Patxi; Kenny, Paul
Abstract:
World Sustainable Building Conference (SB08), 2008, Melbourne, Australia, 21-25 September 2008
There is an increasing trend in reducing energy demand of buildings by improving building envelope thermal characteristics. Proven construction examples as used with the German PassivHaus standard achieve substantial reductions on the heating demand compared to mainstream construction, generally by using high levels of insulation together with ensuring excellent air tightness and minimizing of thermal bridges. However, the limits to which levels of insulation in a building can be increased and still represent overall life cycle energy savings are not clear. Particularly for temperate climates, adopting very-high insulation standards can lead to a danger of over specifying construction elements: once we reach certain levels of insulation, any extra material used can have larger energy costs or “embodied energy” than the energy it saves in the life cycle of the building. This paper prese...
http://hdl.handle.net/10197/3882
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Lifecycle environmental and economic performance of nearly zero energy buildings (NZEB) in Ireland
(2019)
Goggins, Jamie; Moran, Paul; Armstrong, Alan; Hajdukiewicz, Magdalena
Lifecycle environmental and economic performance of nearly zero energy buildings (NZEB) in Ireland
(2019)
Goggins, Jamie; Moran, Paul; Armstrong, Alan; Hajdukiewicz, Magdalena
Abstract:
Directives in the European Union are ensuring that buildings in this region are moving towards nearly zero energy buildings (NZEB). For countries like Ireland, which has a temperate oceanic climate, a key to achieving NZEB is to have high thermal and air tightness performances of the building envelope. Consequently, as the operational energy of the building reduces, the embodied energy (and embodied global warming potential) typically increases as a proportion of the lifecycle energy of the building due to increased embodied energy of the building envelope and the lower operational energy. In order to assess if a design strategy is in fact sustainable, it is becoming essential to evaluate environmental and economic LCA of building design strategies. This paper presents the outcomes of a number of case study buildings in Ireland, which focuses on the full environmental and economic lifecycle assessment of buildings to assess the impact changes in building regulations are having on t...
http://hdl.handle.net/10379/15115
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Net energy analysis of domestic solar water heating installations in operation
(2012)
Hernandez, Patxi; Kenny, Paul
Net energy analysis of domestic solar water heating installations in operation
(2012)
Hernandez, Patxi; Kenny, Paul
Abstract:
The potential of solar water heating systems to reduce domestic energy use is frequently acknowledged. However there are two factors that are rarely discussed when studying this technology. Firstly the real performance of the installed systems in operation, and secondly a life cycle perspective of its energy use. These two issues are reviewed in this paper, and a field study in Ireland is also presented. In the review, some studies show that measured real performance of domestic solar water heating systems can be lower than expectations. Concerning their life cycle energy performance, existing studies show that the initial energy investment for the systems (their embodied energy) is a small portion of the energy savings over their lifetime with calculation paybacks generally lower than 2 years. On the field study carried in Ireland, representative of a maritime north European climate, the ‘energy payback’ based on the expected energy savings is between 1.2 and 3.5 years, values comp...
http://hdl.handle.net/10197/3729
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Operational and embodied energy analysis of 8 single-occupant dwellings retrofit to nZEB standard
(2021)
O'Hegarty, Richard; Colclough, Shane; Kinnane, Oliver; Lennon, Donal; Rieux, Etienne
Operational and embodied energy analysis of 8 single-occupant dwellings retrofit to nZEB standard
(2021)
O'Hegarty, Richard; Colclough, Shane; Kinnane, Oliver; Lennon, Donal; Rieux, Etienne
Abstract:
The 2020 Civil Engineering Research in Ireland conference (CERI 2020), Cork Institute of Technology, Cork (held online due to coronavirus outbreak), 27-28 August 2020
In line with the Energy Performance of Buildings Directive, Irish dwellings are being retrofit to near Zero Energy Building (nZEB) standards - with a number of the deep energy retrofits classified as A-rated. As a result of the low operational energy, the embodied energy share of an nZEB's life cycle energy is significantly increased. Therefore, to obtain a holistic picture of the change in energy profile of buildings, the embodied energy of the material added to achieve that low performance should also be taken into account. This paper presents results from a case study of 8 single-occupant terrace bungalows retrofit to nZEB standard. The pre- and post-retrofit operational performance is first estimated using the Irish Dwelling Energy Assessment Procedure (DEAP). The post-retrofit operational performance of t...
http://hdl.handle.net/10197/11988
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Super-insulate or use renewable technology? Life cycle cost, energy and global warming potential analysis of nearly zero energy buildings (NZEB) in a temperate oceanic climate
(2019)
Moran, Paul; Goggins, Jamie; Hajdukiewicz, Magdalena
Super-insulate or use renewable technology? Life cycle cost, energy and global warming potential analysis of nearly zero energy buildings (NZEB) in a temperate oceanic climate
(2019)
Moran, Paul; Goggins, Jamie; Hajdukiewicz, Magdalena
Abstract:
There are numerous strategies available to design and construct a low energy or nearly zero energy building (NZEB). However, the design strategy for a building depends on a high number of factors including location, climate, cost, available resources, etc. For instance, for countries like Ireland, which have a temperate oceanic climate, a key to achieving NZEB is a high thermal and air tightness performance of the building envelope, installing highly efficient space and water heating systems, and utilising renewable technologies for energy and heat generation. The challenge is to find the best combination of design strategies that would tackle the energy performance problems of a particular building. For example, is it better to design a super-insulated building with minimum heating requirements, or provide less insulation but install a large amount of renewable energy sources? This paper presents the outcomes of a number of case study buildings in Ireland, which focus on the life ...
http://hdl.handle.net/10379/15116
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The assessment of embodied energy in typical reinforced concrete building structures in Ireland
(2013)
Goggins, Jamie; Keane, Terasa; Kelly, Alan
The assessment of embodied energy in typical reinforced concrete building structures in Ireland
(2013)
Goggins, Jamie; Keane, Terasa; Kelly, Alan
Abstract:
This paper demonstrates that by understanding how energy is consumed in the manufacturing of reinforced concrete, designers can significantly reduce the overall embodied energy of structures. Embodied energy of products can vary from country to country. Therefore, to accurately estimate the embodied energy of reinforced concrete structures, data specific to the country where they are being constructed must be used. This paper presents the assessment of embodied energy in typical RC building structures in Ireland.The most common methods used to calculate EE are evaluated in this paper and the most suitable method was applied to reinforced concrete. The EE of a typical 30 MPa concrete mix in Ireland is calculated to be 1.08 MJ/kg. Notably cement is credited with 68% of the total EE. The major contributors of energy consumption are identified, which should aid to minimise energy consumption and optimise efficiency.A case study is presented which compares the EE of a typical reinforced ...
http://hdl.handle.net/10379/3826
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The Embodied Transport Energy Analysis of Imported Wood Pellets
(2007)
Duffy, Aidan; Conroy, Michael
The Embodied Transport Energy Analysis of Imported Wood Pellets
(2007)
Duffy, Aidan; Conroy, Michael
Abstract:
The Irish Government has recently introduced a series of capital grants to boost the uptake of domestic wood-pellet technologies in order to reduce greenhouse gas emissions. These have proved popular and have encouraged a significant number of people to switch from gas- and oil-fired boilers to the cleaner fuel. The demand for wood-pellets has, however, greatly exceeded the national capacity for production. The market for wood pellets elsewhere in Europe is also tight and, consequently, a large proportion of Irish pellets are sourced in Canada. This presents possible problems: the carbon emissions associated with long-distance transport may significantly offset the expected environmental benefits; and the resulting need to purchase carbon credits may impact on the Irish Government’s rationale for promoting the technology. This paper describes a process-based embodied energy analysis which indicates that the difference in transport embodied energy and CO2 emissions between imported a...
https://arrow.dit.ie/dubencon2/5
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What is a sustainable or low impact concrete?
(2021)
Kinnane, Oliver; O'Hegarty, Richard; Reilly, Aidan
What is a sustainable or low impact concrete?
(2021)
Kinnane, Oliver; O'Hegarty, Richard; Reilly, Aidan
Abstract:
The 3rd International Conference on Bio-Based Building Materials, Belfast, United Kingdom, 26-28 June 2019
This paper compares a range of new and proposed 'greener' concretes and evaluates their environmental impact via quantification of their embodied energy. These new concretes are further compared with bio based concretes so as to develop a broad picture of the relative environmental impact of the increasing array of concretes now available to building designers. Some uses, advantages and disadvantages of each type are discussed. Particularly the quantity and volume of concrete material for each specific use case is considered for comparison of the embodied energy for a square meter of building envelope structure. Results show that bio based concretes have considerably lower impact than standard concretes, as exhibited by much lower embodied energies per kilogram of material. However, those values documented in only a few studies, and further repeatedly referenced i...
http://hdl.handle.net/10197/11979
Displaying Results 1 - 14 of 14 on page 1 of 1
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Dublin Institute of Technology (4)
NUI Galway (5)
University College Dublin (5)
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Conference item (4)
Journal article (7)
Other (3)
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Peer-reviewed (4)
Non-peer-reviewed (1)
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2021 (2)
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2013 (1)
2012 (3)
2009 (2)
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