Energy system analysis of a pilot net-zero exergy district

Kılkış, Şiir

doi:10.1016/j.enconman.2014.05.014

Cited by 69 publications

(35 citation statements)

References 27 publications

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“…Based on the aims of the research work, the method is structured to compare the performance of a district for which a net-zero target has been proposed [32,33]. An urban metabolism indicator set with five categories is constructed as the core focus of the analyses.…”

Section: Methodsmentioning

confidence: 99%

“…Proposals for the first two phases of the new district of Östra Sala backe were put forth in [32,33] with the aim of allowing the district to reach an original net-zero target based on the quality of energy. In this research work, these proposals are subjugated to a comprehensive assessment.…”

Section: Background Of the Data Analysesmentioning

confidence: 99%

“…In the prior research work of the author [32,33], the Net-Zero Exergy District (NZEXD) target was put forth to enable an innovative energy concept for Östra Sala backe. According to the NZEXD target, a district should produce as much energy as consumed on an annual basis at the same grade and quality [32,38].…”

Section: Overview Of the Net-zero Exergy Targetmentioning

confidence: 99%

“…According to the NZEXD target, a district should produce as much energy as consumed on an annual basis at the same grade and quality [32,38]. The grade and quality of energy is measured as exergy, which is the useful work potential of a given amount of energy based on a Carnot cycle that is defined according to a reference environment temperature.…”

Section: Overview Of the Net-zero Exergy Targetmentioning

confidence: 99%

See 3 more Smart Citations

A Nearly Net-Zero Exergy District as a Model for Smarter Energy Systems in the Context of Urban Metabolism

Kılkış¹

2017

J. sustain. dev. energy water environ. syst.

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The planning of urban settlements requires a targeted approach towards more sustainable energy, water, and environment systems. This research work analyses the city of Uppsala and a district that is an urban renewal project at the site of former high voltage power lines, namely Östra Sala backe, which will have a new energy concept. The latter is analysed based on proposals for two phases that aim to reach a net-zero district target based on the quality of energy (exergy). An indicator set with five main categories is introduced based on per capita values to enable a comparable basis between the scales of the city and the district, including exergy per capita as a new indicator. The present status of Uppsala is further analysed based on Sankey diagrams to provide insight into the present urban metabolism of the city. The results indicate that the best practice values of Östra Sala backe based on phase two can achieve significant savings in per capita values, which include 5.5 MWh of energy usage, 6.1 MWh of exergy consumption, 33 m 3 of water consumption, 22 kg of waste generation, and 4.2 tonnes of Carbon dioxide (CO2) emissions. Additional scenarios for Uppsala indicate that the district can be about 10 years ahead of the city's existing performance.

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Section: Methodsmentioning

confidence: 99%

Section: Background Of the Data Analysesmentioning

confidence: 99%

Section: Overview Of the Net-zero Exergy Targetmentioning

confidence: 99%

Section: Overview Of the Net-zero Exergy Targetmentioning

confidence: 99%

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A Nearly Net-Zero Exergy District as a Model for Smarter Energy Systems in the Context of Urban Metabolism

Kılkış¹

2017

J. sustain. dev. energy water environ. syst.

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“…As summarized in Table 13, the results of these analyses indicate the quantity of waste heat that may be extracted from urban wastewater and the availability of wood and straw resources that are less than 30 km from the city [188]. Locally available biomass resources must still be considered for use in efficient energy system configurations that may extend to an outlook based on the quality of energy (exergy) [189][190][191] so that the potential of displacing CO2 emissions is maximized. Carbon capture and storage may also be used to further contribute to halving anthropogenic CO2 emissions every decade [192].…”

Section: Mapping Of a Sustainable Development Of Energy Water And Enmentioning

confidence: 99%

Benchmarking South East European Cities with the Sustainable Development of Energy, Water and Environment Systems Index

Kılkış¹

2017

J. sustain. dev. energy water environ. syst.

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Tools that can benchmark cities, including cities in South East Europe, are necessary to enable the comparison and diffusion of more sustainable practices for urban systems. The "Sustainable Development of Energy, Water and Environment Systems Index" provides a composite indicator for benchmarking city performance based on 7 dimensions and 35 main indicators. In this research work, the Index is applied to a new sample of 18 cities in South East Europe for which data is collected, normalized, and aggregated. Klagenfurt (3.08), Velenje (3.06) and Pécs (3.01) are found to be the top three cities in the sample while an average city receives an index score of 2.85. The results are further compared to reference averages and evaluated based on the mean simulated values of 10,000 Monte Carlo experiments. The results are interpreted in quartiles for pioneering, transitioning, solution-seeking, and challenged cities. The results are then applied within a benchmarking tool of the Index that supports policy learning to trigger collaboration between cities and further used to match cities according to a search algorithm based on index performance. In addition, the results are compared to urban hierarchy as well as development contexts and mapped onto the spatial dimension as an initial step for enabling a "Sustainable Development of Energy, Water and Environment Systems Future City Network". The paper concludes with a set of four proposed steps to enable decision-makers and urban planners in using the Sustainable Development of Energy, Water and Environment Systems Index in support of more sustainable urban systems.

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Optimization of Photovoltaic Energy Systems for Residential Customers in Hot Climate Areas Based on Seasonal and Average Daily Load Profile

Zubair

Awan

2021

Energy Tech

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Fixed tilted, single‐axis tracking, and dual‐axis tracking PV systems are compared for one‐way energy meters and net‐energy meters. Optimization of the tilt angle and azimuth angle based on the load profile in one‐way energy meters enhances the net present value. The higher energy demands of summer can be met by lower tilt angles while the PV energy peak can be shifted towards the higher load hours by adjusting the azimuth angle. The results show that the net‐energy system with single‐axis tracking outperforms dual‐axis tracking and fixed tilted systems for a residential PV system one‐way meter, the load curve can be used to optimize the tilt angle and azimuth angle of a fixed tilted system to achieve a higher net present value (NPV) with added advantages of lower building cooling loads and lower self‐shading losses of the PV system. The comparison between the base‐case PV system and the optimized system of a fixed tilted system on a one‐way energy meter in Islamabad and Lahore shows a 15% and 13.7% higher NPV, 3.5%, and 3.6% lower simple payback period respectively. The optimized PV energy system also achieved 28% and 25% more savings in the cooling load of the houses in Islamabad and Lahore, respectively.

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Energy system analysis of a pilot net-zero exergy district

Cited by 69 publications

References 27 publications

A Nearly Net-Zero Exergy District as a Model for Smarter Energy Systems in the Context of Urban Metabolism

A Nearly Net-Zero Exergy District as a Model for Smarter Energy Systems in the Context of Urban Metabolism

Benchmarking South East European Cities with the Sustainable Development of Energy, Water and Environment Systems Index

Optimization of Photovoltaic Energy Systems for Residential Customers in Hot Climate Areas Based on Seasonal and Average Daily Load Profile

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