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Full-Text Articles in Engineering
Optimisation Of Retrofit Wall Insulation: An Irish Case Study, Rakshit D. Muddu, D M. Gowda, Anthony James Robinson, Aimee Byrne
Optimisation Of Retrofit Wall Insulation: An Irish Case Study, Rakshit D. Muddu, D M. Gowda, Anthony James Robinson, Aimee Byrne
Articles
Ireland has one of the highest rates of emissions per capita in the world and its residential sector is responsible for approximately 10% of total national CO2 emissions. Therefore, reducing the CO2 emissions in this sector will play a decisive role in achieving EU targets of reducing emissions by 40% by 2030. To better inform decisions regarding retrofit of the existing building stock, this study proposes Optimum Insulation Thicknesses (OIT) for typical walls in 25 regions in Ireland. The calculation of OIT includes annual heat energy expenditure, CO2 emissions, and material payback period. The approach taken is based on Heating …
The Use Of Three-Dimensional Conjugate Cfd To Enhance Understanding Of, And To Verify, Multi-Modal Heat Transfer In Dynamic Laboratory Test Walls, Rakshit D. Muddu, Timothy Patrick O'Leary, Ronan Hogan, Anthony James Robinson, Aimee Byrne
The Use Of Three-Dimensional Conjugate Cfd To Enhance Understanding Of, And To Verify, Multi-Modal Heat Transfer In Dynamic Laboratory Test Walls, Rakshit D. Muddu, Timothy Patrick O'Leary, Ronan Hogan, Anthony James Robinson, Aimee Byrne
Articles
This work describes the use of conjugate computational fluid dynamics (C-CFD) to simulate controlled laboratory based dynamic heat transfer tests on building components. This study proposes that conjugate CFD simulation can be used to evaluate the influence of combined convective and conductive heat transfer in multi-state building components. To this end, a solid wall and cavity wall were tested with a Calibrated Hotbox and subject to variable temperature conditions leading to combined convective and conductive heat transfer. The varying temperature of the heat source was monitored and used as the input boundary condition in the simulation model, which included a …
Improving Energy Efficiency In Residential Houses In Kosovo, Fatlum Rexhepi
Improving Energy Efficiency In Residential Houses In Kosovo, Fatlum Rexhepi
International Programs
Buildings with poor insulation and infiltration in doors, windows, and other openings have very high heating and cooling demands. Due to lack of maintenance, building materials, and standard they are whopping consumers. The necessity to save energy is enormous, especially with newly environmental constrains. Moreover, this would not only save our natural resources, but it would cut large sums that households spend on electricity, gas, or coal. Thermodynamic calculation of heat gain and loss gave us a lucid picture of benefits respecting nearly zero energy buildings standards while comparing same building prior and after improving its envelope. The consumption after …
Generalized Beam–Spring Model For Predicting Elastic Behavior Of Partially Composite Concrete Sandwich Wall Panels, Salam Al-Rubaye, Taylor Sorensen, Robert J. Thomas, Marc Maguire
Generalized Beam–Spring Model For Predicting Elastic Behavior Of Partially Composite Concrete Sandwich Wall Panels, Salam Al-Rubaye, Taylor Sorensen, Robert J. Thomas, Marc Maguire
Faculty Publications
Partially composite sandwich wall panels (SWP) have been used in the construction industry for at least twenty years. Currently there is limited codified guidance for designers of partially composite concrete SWP, but they are being designed safely and routinely. Design is often guided by the composite connector manufacturers who sell proprietary composite connectors often using a variation of truss-type matrix methods for prediction of elastic behavior of SWPs. The purpose of this paper is to quantify the accuracy of such a model in a uniform manner by developing a generalized version of these matrix models called the beam-spring model (BSM). …
Thermal Bridging In Concrete Sandwich Walls, Taylor J. Sorensen, Robert J. Thomas, Sattar Dorafshan, Marc Maguire
Thermal Bridging In Concrete Sandwich Walls, Taylor J. Sorensen, Robert J. Thomas, Sattar Dorafshan, Marc Maguire
Faculty Publications
Energy efficiency requires continuity of the insulation system in structural and architectural details.
Case Studies Of Cavity And External Wall Insulation Retrofitted Under The Irish Home Energy Saving Scheme: Technical Analysis And Occupant Perspectives, Aimee Byrne, Gerard Byrne, Garrett O'Donnell, Anthony Robinson
Case Studies Of Cavity And External Wall Insulation Retrofitted Under The Irish Home Energy Saving Scheme: Technical Analysis And Occupant Perspectives, Aimee Byrne, Gerard Byrne, Garrett O'Donnell, Anthony Robinson
Articles
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. …
Improving Energy Efficiency And Environmental Sustainability Of Commercial Insulation, Celine F. Manoosingh, James Mihelcic, Manjriker Gunaratne
Improving Energy Efficiency And Environmental Sustainability Of Commercial Insulation, Celine F. Manoosingh, James Mihelcic, Manjriker Gunaratne
Department of Civil Engineering & Construction Faculty Research & Publications
With increasingly stringent energy standards set in place by the Department of Energy, energy efficiency is becoming a paramount concern to manufacturers of appliances. Additionally, the production and disposal of the voluminous amount of polyurethane foam commonly utilized as insulation in refrigeration units poses a significant environmental challenge. In this context, this study investigated an alternative insulation for use in commercial refrigerator/freezer units. A prototype exploring the use of evacuated packets of pyrogenic silica substituting for conventional insulation was assessed. Assessment criteria included experimental comparison of heat transfer characteristics and the energy efficiency of the new insulation as well as …
Transient And Quasi-Steady Thermal Behaviour Of A Building Envelope Due To Retrofitted Cavity Wall And Ceiling Insulation, Aimee Byrne, Gerard Byrne, Anna Davies, Anthony Robinson
Transient And Quasi-Steady Thermal Behaviour Of A Building Envelope Due To Retrofitted Cavity Wall And Ceiling Insulation, Aimee Byrne, Gerard Byrne, Anna Davies, Anthony Robinson
Articles
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 …
Thermal Testing Of Innovative Building Insulations, Eoghan Frawley
Thermal Testing Of Innovative Building Insulations, Eoghan Frawley
Masters
The main objective of this research was to design and develop a Hot Box to test the thermal properties of Eco-quilt multi-foil insulation. This work began by gaining an understanding into how multi-foil works, how it is installed and examining different variations of this insulation. It was clear at an early stage that there were two conflicting opinions on the thermal performance of multi-foils. One set of tests claimed that the insulation had a thermal resistance of approximately 5 m2oC/W. These tests were carried out in real weather conditions, where temperatures were fluctuating, although one laboratory test achieved similar results. …
Insulation Of Concrete Bridge Decks, W. A. Mossbarger Jr.
Insulation Of Concrete Bridge Decks, W. A. Mossbarger Jr.
Kentucky Transportation Center Research Report
The complete elimination of snow and ice from principal highways would dispel the last real impediment from winter-time driving. It is not possible, of course, to prevent rain and snow from falling onto the roadway nor to heat endless miles of roads in order to keep them snow-and ice-free. Applications of de-icing salts during the onset or following icy weather has become a standard practice since 1948, and the quantity of salt used for this purpose has increased steadily each successive year. At the present time, salting provides the most expediently satisfactory treatment for icing conditions. Bridges sometimes pose a …