Energy and exergy utilization efficiencies in the Japanese residential/commercial sectors

Kondo, Kazunori

doi:10.1016/j.enpol.2009.05.060

Cited by 39 publications

(24 citation statements)

References 9 publications

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“…Sectoral exergy research, including the non-domestic sector, has been undertaken in the past 20 years in countries such as the U.K., Norway, Turkey, Saudi Arabia, Malaysia, Greece, Japan, U.S., and Canada (Al-Ghandoor, 2013;Dincer et al, 2004;Ertesvåg, 2001;Gasparatos et al, 2009;Hammond and Stapleton, 2001;Kondo, 2009;Reistad Gordon, 1980;Rosen, 2013;Rosen, 1992;Saidur et al, 2007;Utlu and Hepbasli, 2003;Xydis et al, 2009). The majority of these studies approach the sectoral exergy analysis from a top-down econometric approach.…”

Section: )mentioning

confidence: 99%

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

et al. 2015

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This paper presents the development of a bottom-up stock model to perform a holistic energy study of the Mexican non-domestic sector. The current energy and exergy flows are shown based on a categorisation by climatic regions with the aim of understanding the impact of local characteristics on regional efficiencies. Due to the limited data currently available, the study is supported by the development of a detailed archetype-based stock model using EnergyPlus as a first law analysis tool combined with an existing exergy analysis method. Twenty-one reference models were created to estimate the electric and gas use in the sector. The results indicate that sectoral energy and exergy annual input are 95.37 PJ and 94.28 PJ respectively. Regional exergy efficiencies were found to be 17.8%, 16.6% and 23.2% for the hot-dry, hot-humid and temperate climates respectively. The study concludes that significant potential for improvements still exists, especially in the cases of space conditioning, lighting, refrigeration, and cooking where most exergy destructions occur. Additionally, this work highlights that the method described may be further used to study the impact of large-scale refurbishments and promote national regulations and standards for sustainable buildings that takes into consideration energy and exergy indicators.

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Section: )mentioning

confidence: 99%

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

et al. 2015

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“…The core actions detected as needing to be developed and focused on are: regulations and standards; fiscal policies; agreements and targets; reporting, benchmarking, and training programs; and technological improvements. These strategies have been successfully developed in other countries [51,78,79]. Figure 5 shows the comparison of renewable share and exergy efficiency.…”

Section: Mexican Industrial Sector (Mis): Thermodynamic Efficiencies mentioning

confidence: 99%

“…This disproportion indicates available energy losses, which could be a factor of sectorial inefficiencies, and, consequently, areas in need of improvement. Focused on the differences between the results of the overall energy and exergy efficiencies, we could establish that there is potential for energy optimization, since the exergetic efficiency identifies the irreversibilities of the system under study [79]. Figure 4 is a sample illustration of the year 2015.…”

Section: Mexican Industrial Sector (Mis): Thermodynamic Efficiencies mentioning

confidence: 99%

An Overview of Energy and Exergy Analysis to the Industrial Sector, a Contribution to Sustainability

et al. 2018

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Globally, industry remains one of the main consumers of fossil fuels; hence, it is one of the prime sources of greenhouse gases (GHG). Exergy analysis methods can be applied to detect the processes inefficiencies. To enhance the interconnection of the exergy and the environment theories, renewable share and exergy efficiency are suggested, in a contribution to sustainability. Exergy analysis is proposed and lifted to study the industrial sector. Even though exergy analysis has been applied to study societies, few studies have been conducted to study emerging-market economies. In 2015, Mexico's crude oil production was the 12th biggest worldwide, therefore fossil fuels are still the main source to produce energy for the domestic and productive sectors of the Mexican society. Consequently, a prospective study case in Mexico is suggested. The industrial sectorial exergy consumption amounts 1350 PJ in 2000, increasing to 1591 PJ in 2015. Both energy and exergy efficiencies show similar results along the 16 years, with average energy and exergy efficiencies of 78% and 23%, respectively. In comparison with results of similar studies, Mexican exergy efficiency falls within the ranges, yet below the average of 48%. Thus, poor efficiency is still occurring in the sector. Our proposal could provide significant opportunities to become a more sustainable sector, based on the exergetic renewable share and the exergy efficiency.

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“…Low exergy efficiency in the Malayan commercial sector is mainly due to the use of electricity to cover cooling demands. Kondo (2009), aiming to provide a correlation between available energy losses and current policies, estimated thermodynamic efficiency of Japan's commercial sector. Between the years 1990 and 2006, the author found that building's exergy efficiency was only 5.7%.…”

Section: Building Stock Modelsmentioning

confidence: 99%

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

et al. 2017

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State-of-the-art research suggests that energy systems are best evaluated using exergy analysis, as exergy represents the real value of an energy source, demonstrating it to be the only rational basis for evaluation. After discovering the lack of thermodynamic integration into stock modelling, this paper presents the development of an exergy-based building stock model. The aim of this paper is twofold. Firstly, to investigate the impact of large-scale future energy retrofit scenarios in the English and Welsh (E&W) non-domestic sector, and secondly, to determine the potential of exergy analysis in improving sectoral efficiency and its potential implications on exergy-oriented policy making. The research explores seven different largescale future retrofit scenarios that encompass typical, low-carbon, and low-exergy approaches. Modelling results show that by 2050, current regulations have the potential to reduce carbon emissions by up to 49.0 ±2.9% and increasing sector thermodynamic efficiency from 10.7% to 13.7%. On the other hand, a low-exergy oriented scenario based on renewable electricity and heat pumps is able to reduce carbon emissions by 88.2 ±2.4%, achieving a sectoral exergy efficiency of 19.8%. This modelling framework can provide energy policy makers with new insights on policy options based on exergy indicators and the assessment of their potential impact.

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Energy and exergy utilization efficiencies in the Japanese residential/commercial sectors

Cited by 39 publications

References 9 publications

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

Modelling the energy and exergy utilisation of the Mexican non-domestic sector: A study by climatic regions

An Overview of Energy and Exergy Analysis to the Industrial Sector, a Contribution to Sustainability

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

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