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Subject = Retrofit;
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Displaying Results 1 - 12 of 12 on page 1 of 1
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Achieving nearly zero-energy buildings - A lifecycle assessment approach to retrofitting buildings
(2019)
Moran, Paul; Goggins, Jamie; Hajdukiewicz, Magdalena
Achieving nearly zero-energy buildings - A lifecycle assessment approach to retrofitting buildings
(2019)
Moran, Paul; Goggins, Jamie; Hajdukiewicz, Magdalena
Abstract:
It is now widely recognised in the academic and business worlds that energy efficiency in buildings provides significant environmental and economic opportunities, but also challenges. The building sector offers considerable opportunities to reduce Europe’s energy consumption and carbon emissions. With the percentage of new buildings representing 1% of the total building stock and the low efficiency levels of the older building stock, retrofitting is recognised as the most immediate, pressing, and cost effective mechanism to reduce energy consumption and carbon emissions in the building and construction sector. It is necessary to double or triple the current retrofitting rate to reach EU short and long term energy reduction goals. However, given the age, diversity, size of the Irish and EU building stock, and the economic variables associated, retrofitting to meet sustainability targets on time represents a big challenge. This paper focuses on the current findings on the most effecti...
http://hdl.handle.net/10379/15129
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Application of a staged automated calibration methodology to a partially-retrofitted university building energy model
(2019)
Zuhaib, Sheikh; Hajdukiewicz, Magdalena; Goggins, Jamie
Application of a staged automated calibration methodology to a partially-retrofitted university building energy model
(2019)
Zuhaib, Sheikh; Hajdukiewicz, Magdalena; Goggins, Jamie
Abstract:
Deep-retrofit planning for existing buildings demands high accuracy in energy modelling prediction that minimises the gap between actual and simulated scenarios. A large set of interacting variables and uncertainties in energy performance modelling causes perturbations that can be minimised via model calibration. In this work, a novel multi-stage automated calibration methodology was developed using a case study of a partially-retrofitted university building (>35 yrs old) in Ireland. The methodology enables the analysis of models for Indoor Environmental Quality (IEQ) variables along with energy demand. Due to the higher number of uncertainties in the model, a sensitivity analysis was conducted on the model that is both calibrated and validated as per ASHRAE Guide 14 indices of Cv(RMSE) and NMBE. The calibration process was automated using the optimisation algorithm NSGA-II with two sets of reference data i.e. monthly utility and hourly indoor air temperature. Results demonstrate...
http://hdl.handle.net/10379/15332
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Mark
Bottom-up modelling of energy demand and technical energy savings potential in the Irish residential sector
(2014)
Dineen, Denis
Bottom-up modelling of energy demand and technical energy savings potential in the Irish residential sector
(2014)
Dineen, Denis
Abstract:
The International Energy Agency has repeatedly identified increased end-use energy efficiency as the quickest, least costly method of green house gas mitigation, most recently in the 2012 World Energy Outlook, and urges all governing bodies to increase efforts to promote energy efficiency policies and technologies. The residential sector is recognised as a major potential source of cost effective energy efficiency gains. Within the EU this relative importance can be seen from a review of the National Energy Efficiency Action Plans (NEEAP) submitted by member states, which in all cases place a large emphasis on the residential sector. This is particularly true for Ireland whose residential sector has historically had higher energy consumption and CO2 emissions than the EU average and whose first NEEAP targeted 44% of the energy savings to be achieved in 2020 from this sector. This thesis develops a bottom-up engineering archetype modelling approach to analyse the Irish residential se...
http://hdl.handle.net/10468/1762
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Case Studies of Cavity and External Wall Insulation Retrofitted Under the Irish Home Energy Saving Scheme: Technical Analysis and Occupant Perspectives
(2016)
Byrne, Aimee; Byrne, Gerard; O'Donnell, Garrett; Robinson, Anthony
Case Studies of Cavity and External Wall Insulation Retrofitted Under the Irish Home Energy Saving Scheme: Technical Analysis and Occupant Perspectives
(2016)
Byrne, Aimee; Byrne, Gerard; O'Donnell, Garrett; Robinson, Anthony
Abstract:
The residential sector represents 27% of primary energy consumption in Ireland. This paper examines the case study of the Irish government’s national grant scheme to encourage energy efficiency retrofit in private housing. That is the Home Energy Saving (HES) Scheme, later rebranded the Better Energy: Homes (BEH) Scheme. The methodology involved monitoring several homes immediately before and after retrofit alongside discussions with occupants. The examination focused on specific measures commonly introduced through the HES/BEH programme − cavity and external wall insulation. It has been found that a significant decrease in heat loss through the walls was measured in all cases. Regardless, the occupant played a considerable role in the change in energy use in the buildings, and the main motivation for retrofit was found to be comfort and not energy savings or environmental concerns. As a result, the actual energy savings are notably less than the potential savings had the pre and post com...
https://arrow.dit.ie/engschcivart/78
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Deep-retrofit decision-making support for achieving nearly zero-energy buildings with enhanced comfort
(2019)
Zuhaib, Sheikh
Deep-retrofit decision-making support for achieving nearly zero-energy buildings with enhanced comfort
(2019)
Zuhaib, Sheikh
Abstract:
The emerging trends for deep-retrofit of existing buildings in Europe require formulation of strategies for nearly zero-energy buildings (nZEBs) and achieving benchmarks as outlined in the Energy Performance of Buildings Directive (EPBD) recast. The fundamental process of retrofitting to an explicit high performance (both energy and comfort) necessitates the development of robust and diverse methodologies to be used during the early-stages of planning in retrofit projects. The construction sector lacks the extensive use of such methods for early decision-making that are essential to accelerate building renovation in Europe. Therefore, considering the need to upgrade existing buildings to nZEB, the thesis aims at developing decision-making support for deep-retrofits. This research presents the application of combined (i) research techniques, (ii) audit and assessment methods, (iii) building simulation, and (iv) optimisation strategies investigated on an existing building field-study ...
http://hdl.handle.net/10379/15117
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Evaluating the structural capacity of concrete elements through in-situ instrumentation
(2013)
Byrne, David; Goggins, Jamie
Evaluating the structural capacity of concrete elements through in-situ instrumentation
(2013)
Byrne, David; Goggins, Jamie
Abstract:
The difficulty in predicting the long term load capacity of concrete elements is well documented. Time dependent effects such as creep and shrinkage coupled with varying loading events, particularly during construction, can all have an adverse effect on the long term performance of a concrete structure. This paper proposes a method that utilises in-situ instrumentation to predict the load carrying capacity of concrete members. During the construction of the Engineering building at the National University of Ireland, Galway over 260 sensors were embedded in a number of key concrete elements. The sensors are being continually monitored with the use of automatic datalogging equipment and the data is being used to monitor changes in geometric and material properties along with the subsequent time dependent deterioration of the elements. The paper will illustrate how the in-situ data from the demonstrator building can be used to estimate the real time behaviour of the concrete elements a...
http://www.ttp.net/978-3-03785-796-0.html
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LiDAR point-cloud mapping of building façades for building energy performance simulation
(2019)
O'Donnell, James; Truong-Hong, Linh; Boyle, Niamh; Corry, Edward; et al.
LiDAR point-cloud mapping of building façades for building energy performance simulation
(2019)
O'Donnell, James; Truong-Hong, Linh; Boyle, Niamh; Corry, Edward; et al.
Abstract:
Current processes that create Building Energy Performance Simulation (BEPS) models are time consuming and costly, primarily due to the extensive manual inputs required for model population. In particular, generation of geometric inputs for existing building models requires significant manual intervention due to the absence, or outdated nature of available data or digital measurements. Additionally, solutions based on Building Information Modelling (BIM) also require high quality and precise geometrically-based models, which are not typically available for existing buildings. As such, this work introduces a semi-automated BEPS input solution for existing building exteriors that can be integrated with other related technologies (such as BIM or CityGML) and deployed across an entire building stock. Within the overarching approach, a novel sub-process automatically transforms a point cloud obtained from a terrestrial laser scanner into a representation of a building's exterior faça...
http://hdl.handle.net/10197/10995
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Quantitative evaluation of deep retrofitted social housing using metered gas data
(2019)
Beagon, Paul; Boland, Fiona; O'Donnell, James
Quantitative evaluation of deep retrofitted social housing using metered gas data
(2019)
Beagon, Paul; Boland, Fiona; O'Donnell, James
Abstract:
Research into home energy retrofit is important because most existing homes will operate in 2050. A lack of funding or incentives often prevents home energy retrofit, particularly of social housing. This study analysed retrofitted Irish social housing and their gas meter data, including pre-payment meters that require regular “top-ups” purchased from shops. The data comprised records from 100 retrofit and control group homes throughout 2013–2015. A novel evaluation of retrofitted rented homes processed meter data into multiple metrics. Gas consumption is computed per house and weather correction is incorporated, enabling statistical testing of the retrofit. A “difference in difference” technique compared the retrofit and control groups. Gas consumptions of the most popular building type are plotted as distribution curves before and after retrofit. Subsequently the energy use intensity (kWh/m2/year) is computed per home; leading to calculation of the prebound effect. In social housin...
http://hdl.handle.net/10197/11000
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Recession or retrofit: An ex-post evaluation of Irish residential space heating trends
(2019)
Dennehy, Emer R.; Dineen, Denis; Rogan, Fionn; Ó Gallachóir, Brian P.
Recession or retrofit: An ex-post evaluation of Irish residential space heating trends
(2019)
Dennehy, Emer R.; Dineen, Denis; Rogan, Fionn; Ó Gallachóir, Brian P.
Abstract:
Analysis of the technical potential for energy efficiency often highlights very large potential savings; however, the reality of savings achieved often falls far short of this potential. Ex-post analysis is known to be important for quantifying realised energy-efficiency savings, but is often neglected for many reasons. This paper describes an approach to an ex-post analysis that uses readily available administrative data and provides insights into the impact of an energy-efficiency policy measure of residential energy-efficiency retrofitting (upgrades). Ex-post analyses have the advantage of including the impacts of events and behaviours that coincide with energy-efficiency programs and thus facilitate disentangling external influences and avoidance of misattribution of savings. Three different quantitative approaches are used to determine whether the national energy-efficiency retrofit programmes or the economic recession was responsible for the sharp fall in residential space-hea...
http://hdl.handle.net/10468/9004
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Retrofit minipile system to increase the capacity of existing foundations
(2008)
ORR, TREVOR L
Retrofit minipile system to increase the capacity of existing foundations
(2008)
ORR, TREVOR L
Abstract:
This paper describes a novel underpinning system incorporating Ankerbond and high capacity vertical piles bored through existing concrete foundations. A special cutting head, with three diamond tipped cutters, is used to cut three grooves in the cored holes through the existing concrete foundations. These grooves provide a strong pile head connection to transfer additional load from the existing foundations into the new piles, i.e. the existing foundations are upgraded. The advantages of this system are its ease of installation, its reduced construction time, and its efficiency due to the new vertical piles located closely around the existing columns. The result is that no foundation beams are required and that overall costs are significantly lower than other underpinning solutions. Two case histories are presented which involve the use of the Ankerbond system in conjunction with high capacity retrofitted minipiles. In these case histories, the capacities of the existing foundations...
http://hdl.handle.net/2262/39202
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State of the Irish Housing Stock - Modelling the heat losses of Ireland’s existing detached rural housing stock & estimating the benefit of thermal retrofit measures on this stock
(2013)
Ahern, Ciara; O'Flaherty, Micheal; Griffiths, Philip
State of the Irish Housing Stock - Modelling the heat losses of Ireland’s existing detached rural housing stock & estimating the benefit of thermal retrofit measures on this stock
(2013)
Ahern, Ciara; O'Flaherty, Micheal; Griffiths, Philip
Abstract:
Ireland’s housing stock has been identified as being amongst the least energy efficient in Northern Europe. Consequently, atmospheric emissions are greater than necessary. Government funded schemes have been introduced to incentivise the uptake of thermal retrofit measures in the domestic Irish market. A study of Ireland’s housing highlights the dominance of detached houses (43%), 72% of which are rurally located and are predominantly heated with fuel oil. This paper investigates the economic and carbon case for thermal retrofit measures to the existing detached, oil centrally heated, rural housing stock. The study found the case for energy efficiency measures to be categorical and supports the Irish Government’s focus on energy efficiency policy measures. Thermal retrofit measures in the detached housing stock have the potential to realise an averaged 65% theoretical reduction in heating costs and CO2 emissions for houses constructed prior to 1979 (coinciding with the introduction ...
https://arrow.dit.ie/engschcivart/34
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Transient and Quasi-Steady Thermal Behaviour of a Building Envelope due to Retrofitted Cavity Wall and Ceiling Insulation
(2013)
Byrne, Aimee; Byrne, Gerard; Davies, Anna; Robinson, Anthony
Transient and Quasi-Steady Thermal Behaviour of a Building Envelope due to Retrofitted Cavity Wall and Ceiling Insulation
(2013)
Byrne, Aimee; Byrne, Gerard; Davies, Anna; Robinson, Anthony
Abstract:
Accurate understanding of the thermal behaviour of building components is essential for predicting heat-ing or cooling needs and facilitates the implementation of more successful energy saving strategies and retrofits. This paper focuses on a specific measure commonly introduced through the residential energy efficiency retrofit programmes in Ireland–insulation. Traditionally, assessments of the performance of building envelopes have been based on assumed thermal resistances of the materials involved, labora-tory tests and computer modelling. The aim of the present work is to investigate the in situ thermal behaviour of a case study building and its components under transient and quasi-steady environmental conditions, comparing data before and after the fixing of cavity wall and ceiling insulation. The paper concludes by proposing that predicted values of heat loss using standardised assumed material prop-erties of the existing structure do not reflect the actual values achieved in situ f...
https://arrow.dit.ie/engschcivart/77
Displaying Results 1 - 12 of 12 on page 1 of 1
Bibtex
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Institution
Dublin Institute of Technology (3)
NUI Galway (4)
Trinity College Dublin (1)
University College Cork (2)
University College Dublin (2)
Item Type
Conference item (2)
Doctoral thesis (2)
Journal article (8)
Peer Review Status
Peer-reviewed (5)
Non-peer-reviewed (1)
Unknown (6)
Year
2019 (6)
2016 (1)
2014 (1)
2013 (3)
2008 (1)
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