Electric efficiency indicators and carbon dioxide emission factors for power generation by fossil and renewable energy sources on hourly basis

Marrasso, Elisa; Roselli, Carlo; Sasso, Maurizio

doi:10.1016/j.enconman.2019.06.079

Cited by 67 publications

(41 citation statements)

References 16 publications

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“…Following a complete replicable methodology described in Reference 22 it has been possible to evaluate different power grid efficiency indicators on hourly basis considering the contribution of the energy sources in various manners.…”

Section: Methodsmentioning

confidence: 99%

“…Þ evaluated according to Equations (5) and 7in 2017, amount to 503 and 356 gCO 2 / kWh El , respectively. 22 The lower value achieved by α TE F + RES is due to the contribution of RES-based electricity production. In Figure A1 the hourly correlation between η TE F + B and α TE F + B parameters is showed while in Figure A2 η Ã TE F + RES is plotted against the RESs penetration in electricity production on hourly basis.…”

Section: Evaluation Of Italian Electric Efficiency Indicators and Tmentioning

confidence: 99%

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Energy and environmental performance of a heat pump in different power grid scenarios

2020

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Electric-driven heat pumps are one of the most encouraging systems that could support the raising of renewables contribution in civil sector energy consumption, especially with reference to the Countries with a high contribution of renewable energy sources in electricity generation mix. However, the evaluation of the effective energy and environmental performance of an electric heat pump meeting the space heating and cooling requests of a building has to consider several factors that affect the results. Among them great attention should be given to the variability of weather conditions in which the system operates, the changeability of the

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Section: Methodsmentioning

confidence: 99%

Section: Evaluation Of Italian Electric Efficiency Indicators and Tmentioning

confidence: 99%

Energy and environmental performance of a heat pump in different power grid scenarios

2020

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“…Due to the strategic position of the power industry in various countries, the efficiency evaluation of the power industry has always been a hot issue for many experts and scholars [10][11][12][13][14]. The data envelopment analysis (DEA) method has been evaluated since the first time in 1978 by the well-known American researchers Charnes, Cooper, and Rhodes, and became the most common method used.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Does the Energy Efficiency of Power Companies Affect Their Industry Status? A DEA Analysis of Listed Companies in Thermal Power Sector

2019

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Under the concept of green development, coal and oil control policies were frequently introduced, but the “cold” thinking under the “hot” environment is more conducive to the smooth promotion of the “transitional period” of China’s power-structure transformation. How to better consider production efficiency and environmental benefits is the theme that thermal power enterprises need to constantly break through. The most feasible “transitional period” path for thermal power enterprises is improving the efficiency of energy saving, reducing emissions, and simultaneously ensuring benefits and social awareness. This paper selected 17 listed companies in China’s thermal power sector, combined with their input resources, output, and other indicators, using a slacks-based measure–data envelopment analysis (SBM–DEA) model with undesirable outputs, and comprehensively analyzed the relationship among the technical efficiency improvement and the industry status, including price earnings ratio (P/E ratio) in the recent two years. The results show that the improvement of energy efficiency can indeed optimize enterprises’ operations and improve P/E ratio. Although clean-energy power generation has better environmental benefits, it is still lacking in efficiency; therefore, the balance between efficiency and environment sustainability should concern us.

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“…In particular, the average yearly η PG El calculated on the basis of hourly Italian power grid efficiency amounts to 0.710 while the average annual α is equal to 356 gCO 2 /kWh El. [50].…”

Section: Elmentioning

confidence: 99%

“…• Scenario_MV (MV): that takes in two account the average monthly values of η PG El and α evaluated in [50] and summarized in Table 5 Table 5. Average monthly values of η PG El and α referred to Italian electricity production in 2017 [50]. The FIXED case is considered for both RS and PS, while the reaming five cases are analyzed only for PS.…”

Section: Elmentioning

confidence: 99%

Comparison of Two Solar PV-Driven Air Conditioning Systems with Different Tracking Modes

2020

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In this paper two solar electric-driven air conditioning systems are compared and analyzed from an energy and environmental point of view. Both systems satisfy the electricity, space heating and cooling needs of an existing multi-purpose, multi-story building that is simulated with TRNSYS 17. The first one, considered as reference system, is based on a centralized electric heat pump coupled with a conventional photovoltaic plant installed 10 years ago. The second one, hereinafter proposed system, has a hybrid configuration, consisting of a ground-source heat pump, a low temperature thermal network and a series of electric heat pumps, one per apartment. In addition, the plant is connected to a high-performance commercial photovoltaic system equipped with a solar tracking system to the panels. Five different solutions realized with vertical, two horizontal orientations, polar and two-axis trackers are taken into account and compared with the standard fixed configuration. The last hybrid configuration can be seen as an upgrade of an existing decentralized air conditioning system in which the local electric heat pumps are converted in water-to-water devices that interact with the thermal grid representing the heat source/sink for them. In both solar electric heating and cooling plants the photovoltaic system is installed on the building roof and it produces electricity to feed the heat pumps and end-users. The electricity surplus or the load not covered by solar field is fed to/taken from power grid. The energy and environmental analyses have been performed by considering both average annual and monthly values of power grid efficiency and CO2 emission factor for electricity. By comparing reference system and proposed one equipped with a two-axis tracker system a primary fossil energy saving of 101.67% is achieved in summer period and 28.10% in winter period. These percentages are the highest values recorded, even if, for all configurations the energy analysis rewards the proposed system. The results of environmental analysis demonstrate that the reference system has the worst performances compared to proposed system with all solar tracker systems selected guarantying positive values for avoided carbon dioxide index up to 45.86%.

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Electric efficiency indicators and carbon dioxide emission factors for power generation by fossil and renewable energy sources on hourly basis

Cited by 67 publications

References 16 publications

Energy and environmental performance of a heat pump in different power grid scenarios

Energy and environmental performance of a heat pump in different power grid scenarios

Does the Energy Efficiency of Power Companies Affect Their Industry Status? A DEA Analysis of Listed Companies in Thermal Power Sector

Comparison of Two Solar PV-Driven Air Conditioning Systems with Different Tracking Modes

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