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Limited By:	Subject = Natural Resources and Conservation;

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Displaying Results 1 - 6 of 6 on page 1 of 1

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A Life Cycle Cost Analysis of Large-scale Thermal Energy Storage Technologies for Buildings using Combined Heat and Power (2010)

Gaine, Kenneth; Duffy, Aidan

A Life Cycle Cost Analysis of Large-scale Thermal Energy Storage Technologies for Buildings using Combined Heat and Power (2010)

Gaine, Kenneth; Duffy, Aidan

Abstract:

Buildings account for approximately 40% of energy consumption and greenhouse gas (GHG) emissions in developed economies, of which approximately 55% of building energy is used for heating and cooling. The reduction of building-related GHG emissions is a high international policy priority. For this reason and because there are many technical solutions for this, these polices should involve significant improvements in the uptake of small-scale energy efficient (EE) systems. However the widespread deployment of many technologies, must overcome a number of barriers, one of which is a temporal (diurnal or seasonal) mismatch between supply and demand. Costeffective thermal storage solutions have the potential to improve financial performance, while simultaneously reducing associated GHG emissions. The aim of this paper is to identify existing thermal energy storage (TES) technologies and to present and asses the economic and technical performance of each for a typical large scale mixed dev...

https://arrow.dit.ie/dubencon2/8

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A Stochastic Model for Wind Turbine Power Quality using a Levy Index Analysis of Wind Velocity Data (2011)

Blackledge, Jonathan; Coyle, Eugene; Kearney, Derek

A Stochastic Model for Wind Turbine Power Quality using a Levy Index Analysis of Wind Velocity Data (2011)

Blackledge, Jonathan; Coyle, Eugene; Kearney, Derek

Abstract:

The power quality of a wind turbine is determined by many factors but time-dependent variation in the wind velocity are arguably the most important. After a brief review of the statistics of typical wind speed data, a non- Gaussian model for the wind velocity is introduced that is based on a Levy distribution. It is shown how this distribution can be used to derive a stochastic fractional diusion equation for the wind velocity as a function of time whose solution is characterised by the Levy index. A Levy index numerical analysis is then performed on wind velocity data for both rural and urban areas where, in the latter case, the index has a larger value. Finally, an empirical relationship is derived for the power output from a wind turbine in terms of the Levy index using Betz law.

https://arrow.dit.ie/engscheleart/146

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An Assessment of the Energy Generation Potential of Photovoltaic Systems in Cameroon Using Satellite-Derived Solar Radiation Datasets (2014)

Ayompe, Lacour; Duffy, Aidan

An Assessment of the Energy Generation Potential of Photovoltaic Systems in Cameroon Using Satellite-Derived Solar Radiation Datasets (2014)

Ayompe, Lacour; Duffy, Aidan

Abstract:

Cameroon like most developing countries does not have a reliable network of surface observation stations for collecting weather data. This has been a major drawback for accurate assessment of the energy generation potential of photovoltaic systems in Cameroon. A viable alternative is to obtain site-specific solar irradiation from satellite-derived datasets. In this paper, the energy output, capacity factor and performance ratio of photovoltaic systems in 33 locations spread around ten regions in Cameroon have been evaluated using monthly average daily global horizontal solar irradiation from long-term satellitederived data available in Solar GIS software. An economic assessment revealed that a simple payback period of 5.6 years and levelised cost of electricity generation of 6.79 €c/kWh can be achieved in locations with annual electricity generation of 1764 kWh/kWp if the capital cost of the PV system is 1500 €/kWp at a discount rate of 5%. Alternatively, the simple payback period w...

https://arrow.dit.ie/aaconmusart/29

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Applying Geographic Information Systems to Support Strategic Environmental Assessment: Opportunities and Limitations in the Context of Irish Land-use Plans (2010)

Gonzalez, Ainhoa; Gilmer, Alan; Foley, Ronan; Sweeney, John; Fry, John

Applying Geographic Information Systems to Support Strategic Environmental Assessment: Opportunities and Limitations in the Context of Irish Land-use Plans (2010)

Gonzalez, Ainhoa; Gilmer, Alan; Foley, Ronan; Sweeney, John; Fry, John

Abstract:

The strengthening of spatial database infrastructures, further promoted by the INSPIRE Directive adopted in 2007, has led to an increased use of spatial data in planning and decision-making. Given that land-use plans are intrinsically spatial, such evidence and approaches can significantly benefit plan-making. A spatial framework could especially support the specific Strategic Environmental Assessment (SEA) aspects of the plan-making process. Spatial tools such as Geographic Information Systems (GIS) are particularly well-placed to support the environmental integration sought in SEA by providing evidence through the spatial assessment of multiple environmental datasets. Moreover, GIS bring the opportunity to augment conventional assessment techniques (e.g. matrix-based assessments) by acting as visual mediators of spatial knowledge and by providing an effective tool for the spatial and temporal analysis of environmental impacts. This paper presents a GIS-based approach to SEA (GISEA...

https://arrow.dit.ie/beschspart/7

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Input-output Analysis of Irish Construction Sector Greenhouse Gas Emissions (2010)

Duffy, Aidan; Acquaye, Adolf

Input-output Analysis of Irish Construction Sector Greenhouse Gas Emissions (2010)

Duffy, Aidan; Acquaye, Adolf

Abstract:

Ireland is committed to limiting its greenhouse gas (GHG) emissions to 113% of 1990 levels over the period 2008-12 and to 84% of 2005 levels by 2020 under the Kyoto Agreement and the EU’s ’20 20’ by 2020 respectively. National policies have targeted many industry sectors but have failed to directly tackle GHG emissions associated with construction activity. This paper estimates energy and GHG emissions intensities of the Irish construction sector and subsectors and estimates its contribution to Irish national emissions. This information is used to identify and assess the impacts of policy measures which would result in a reduction in emissions from the sector in a cost-effective manner. Energy and emissions intensities are estimated using input-output analysis techniques applied to Irish construction sector. In 2005 the Irish construction sector was responsible for the emission of 13.81mtCO2eq, comprising 2.37mt (17%) of direct on-site emissions, 5.69mt (41%) upstream indirect domes...

https://arrow.dit.ie/engschcivart/15

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Stochastic Hybrid Embodied CO2-eq Analysis: an Application to the Irish Apartment Building Sector (2011)

Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit

Stochastic Hybrid Embodied CO2-eq Analysis: an Application to the Irish Apartment Building Sector (2011)

Acquaye, Adolf; Duffy, Aidan; Basu, Biswajit

Abstract:

Although embodiedCO2-eq analysis has seen recent developments as evident in the establishment of the ISO14040 and 14044 LCA standards, it is recognized that due to weaknesses in gathering data on product-related emissions,embodiedCO2-eq values are probabilistic. This paper presents a stochastic analysis of hybrid embodied CO2-eq in buildings to account for this weakness in traditional methods and, by way of example, applies it to an Irish construction-sector case study. Using seven apartment buildings, 70,000 results are simulated with Monte Carlo analysis and used to derive probabilistic and cumulative embodied CO2-eq intensity distributions for apartment buildings in Ireland. A Wakeby distribution with known statistical parameters and uncertainty was derived for the average embodied CO2-eq intensity of apartment building in Ireland. The mean hybrid embodied CO2-eq (ECO2-eq) intensity was estimated to be 1,636gCO2-eq/€ with an uncertainty of 73gCO2-eq/€ . The stochastic analysis he...

https://arrow.dit.ie/dubenart/46

Displaying Results 1 - 6 of 6 on page 1 of 1