Energy saving in case of intermittent production by retrofitting service plant systems through inverter technology: a feasibility study

Faccio, Maurizio; Gamberi, Mauro

doi:10.1080/00207543.2013.832840

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…Such demand level is typical of medium and large units (in general, industries) supplied by three-phase voltages. Therefore, a three-phase PF definition compatible with the characteristics of TIMs (industries main load [14]) might be more suitable for billing. Nonetheless, it was not found an explicit statement in the investigated documents about which of the existing PF definitions should be used.…”

Section: Prospect Of Pf Charging Policiesmentioning

confidence: 99%

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Fair Power Factor Billing Under Unbalanced and Nonsinusoidal Voltage Supply

2022

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Utilities apply an additional fee for medium and large customers with low power factors. However, unfair financial charges may occur in installations subjected to voltage unbalance and harmonic distortion. The objective of this paper is to determine the fairest PF definitions and their corresponding measurement algorithms in the case in which a constant impedance load or an induction motor is supplied with unbalanced and nonsinusoidal voltages. Fairness is defined considering that the meter (built based on a particular definition and measurement method) under nonideal supply should lead to very close values as if it was submitted to an ideal balanced sinusoidal supply. We performed computational simulations to emulate several conditions in which a balanced customer (modeled as a constant impedance load or an induction motor) is charged due to a voltage supply no longer balanced and sinusoidal. We also performed experimental tests with an induction motor subjected to a wide range of unbalanced nonsinusoidal supply conditions to ratify the conclusions drawn from the simulations. Based on the simulation results and the experimental tests, we indicate some power factor definitions and measurement methods that are not significantly affected by voltage unbalance and harmonic distortions. These indicated PF definitions provide the fairest billing for conditions with unbalanced nonsinusoidal voltages.

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Section: Prospect Of Pf Charging Policiesmentioning

confidence: 99%

“…From the foregoing discussion, it can be noticed that evaluation of one important load has not been done yet. According to [14]: "there are 85 million large electrical motors in the community market. These consume 65-70% of the energy used within industry."…”

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confidence: 99%

Fair Power Factor Billing Under Unbalanced and Nonsinusoidal Voltage Supply

2022

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“…Industrial plants have to face variable, uncertain and intermittent demands (e.g., days with high production and days with no production, alternation of working times and idle times, etc.,). For that reason, the production process is run at a wide range of production rates, and the required flexibility results in reduced energy efficiency and increased costs [11]. Consequently, this range of production rates should be considered when investments in energy efficiency measures (EEMs) are planned.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Investments in Industry with Uncertain Demand Rate: Effects on the Specific Energy Consumption

2019

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The term "energy efficiency" covers a wide scope and it is affected by a lack of clarity. To overcome this issue, quantitative measures should be defined and evaluated for each unit of product or process considered. These quantitative indicators are necessary to support and evaluate energy efficiency improvements in industry, by allowing to (i) monitor the energy performance, and (ii) perform benchmarking analyses with best available techniques or similar processes. The specific energy consumption (SEC), i.e., the amount of energy consumed per unit of product/output, is the most commonly used index. Because of the uncertain demand faced by companies, production processes run at a rate that can vary within a certain range, to which correspond a different utilization of plants. Energy efficiency investments can be categorized in accordance to how they affect the SEC: i.e., the first group of investments has the same effects for each production rate (e.g., replacement of dated electric motors with new technologies), while the other has different effects for different ranges of production rate (e.g., installation of an inverter). The present work proposes a novel decision model for supporting the evaluation of the more suitable energy efficiency investment in an industrial context where the demand is uncertain. A numerical example based on a case study from the aluminum industry is then proposed in order to highlight the relevance of the problem discussed and to evaluate the behavior of the models in different scenarios characterized by different load factors. From the results, it evinced that the return of the investment strongly depends on the range of production rate and, thus, on the demand variability.

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“…days with high production and days with no production, working times alternate with idle times. For that reason, a wide range of production rate interests the production and the required flexibility results in reduced energy efficiency and increasing costs [11]. Even the specific energy consumption is subject to uncertainty, as it is a function of the production rate.…”

Section: Introductionmentioning

confidence: 99%

Investments in Energy Efficiency with Variable Demand: SEC’s Shifting or Flattening?

Marchi

Zanoni

2015

Advances in Production Management Systems: Innovative Production Management Towards Sustainable Growth

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In order to support energy efficiency improvement, it is essential to monitor the energy performance and to make benchmarking with similar process or related Best Available Techniques. Among different key performance indicators that compare similar processes, the most relevant for the industrial sector is the specific energy consumption (SEC). With regard to the energy demand in an industrial process, a variable and fixed portion can generally be distinguished: as a direct consequence the amount of energy used per unit of product (SEC) usually decreases while the production rate increases. It should be noted that often production processes face variable demand over their utilization. Aim of this work is to propose a novel decision model to support the identification of the more suitable investment in energy efficiency given the variable demand expected, explicitly considering that the effect of investments in energy efficiency can be categorized in two main categories: those shifting the SEC curve and those flattening the SEC curve.

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Energy saving in case of intermittent production by retrofitting service plant systems through inverter technology: a feasibility study

Cited by 8 publications

References 24 publications

Fair Power Factor Billing Under Unbalanced and Nonsinusoidal Voltage Supply

Fair Power Factor Billing Under Unbalanced and Nonsinusoidal Voltage Supply

Energy Efficiency Investments in Industry with Uncertain Demand Rate: Effects on the Specific Energy Consumption

Investments in Energy Efficiency with Variable Demand: SEC’s Shifting or Flattening?

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