Electrical Energy Consumption Research Articles

Electrocoagulation (EC) treatment of model wastewater containing Rhodamine B

The colour removal of synthetic Rhodamine B (RhB) wastewater by using the electrocoagulation (EC) process in batch mode utilizing commercially available iron plates as electrodes was investigated. The colour removal (%) was calculated for the EC process by taking into account the effects of several factors such as pHi, current density, RhB concentration and temperature. When NaCl was utilized as the electrolyte for EC, the efficiency of colour removal was enhanced. At the optimal experimental conditions (pHi 7.0, 100 A/m2, 50 ppm RhB concentration, 30 minutes, 30 oC and 0.075 M NaCl concentration), the colour removal (%) was 87.27 %. The negative values of ΔH° and ΔS° and ΔG° indicate that the adsorption process was spontaneous in nature and unfavorable at higher temperatures. The electrical energy consumption was assessed to be 2.44 KWh/m3. Characterization of the sludge was also carried out.

Mitigating the Energy Consumption and Carbon Emissions of a Residential Area in a Tropical City Using Digital Twin Technology: A Case Study of Bertam, Penang

As of 2022, roughly 79.8% of Malaysia’s population resides in urban areas, increasing the population density of its cities. The hot and humid climate in Malaysia necessitates the constant use of air conditioning, especially in cities, resulting in high residential electric consumption and carbon emissions. The residential sector significantly contributes to global climate change, accounting for 27% of global energy consumption and 17% of carbon emissions. To address this concern, the local framework of the National Low Carbon Cities Masterplan (NLCCM) is advocating for a minimum 33% reduction in carbon emissions by 2030 in urban settings, aligning with the commitments made at the 15th Conference of Parties (COP 15). The aim of this study was to determine the energy consumption and carbon emission of residential areas in a tropical city, as well as explore potential energy and carbon savings. Utilizing the Intelligent Communities Lifecycle–Intelligent Community Design (iCL-iCD) energy simulation software, a digital twin of Bertam City, Penang, was developed. This digital model included 65.4% residential housing, which, in the specific scenario under study, accounted for 36% of the city’s electrical energy consumption for cooling purposes only. An early simulation of the residential areas of the city estimated the baseline energy consumption and carbon emissions to be 607 GWh and 314,736 tCO2e, respectively. Several energy-efficient measures were applied to the residential area of Bertam City, revealing a potential saving of 37.3% in both energy and carbon emissions.

Use of Magnetic Flux Leakage to Diagnose Damage to a Lift Guide Rails System with Reference to the Sustainability Aspect

The scientific objective of the conducted experimental research was to find an answer as to whether the application of magnetic flux leakage would be an effective tool for assessing the technical condition of lift guide rails in which the loss of thickness of the guide part is damage resulting from the brake whose operation destructively affects the surface shown. In particular, the scientific objective was to investigate the potential of this method in the context of quantitative assessment of the degree of damage featuring small increments in depth at the level of tenths of a millimetre. The conducted research was also aimed at determining the correlation of the effect of damage type with the nature of the signal recorded. The article presents the results of our own research, obtained from experiments on the use of magnetic flux leakage (MFL) to diagnose damage occurring on lift guide rails. During operation, lift guide rails are exposed to contact with the friction elements of brakes, resulting in the violation of their surfaces. Damage to the working surfaces of guide rails increases the vibration of the device, noise and wear of other components of the lift, such as guide rails. Currently, diagnostics of lift guide rails are not carried out, and their replacement depends on their technical condition. However, from an economic point of view, there are situations wherein their condition allows their use without their replacement with new ones. This was the main factor that guided the authors; we used a diagnostic head of our own design for the tests. The obtained measurement results showed that magnetic flux leakage can be used with great success to diagnose damage to guide rails. The results obtained in the laboratory shall be further developed in the form of research on correlating the signals obtained from magnetic sensors and the size of the damage, which shall eventually allow for a final quantitative assessment of guide rails regarding their technical condition. The conducted research fits into the scope of sustainable development by reducing the need for the consumption of electric energy and the emission of harmful substances into the atmosphere in the overall production balance. This will be made possible by implementing the developed head in industrial practice in the context of assessing the need to replace guide rails with new ones. The economic and environmental efficiency that is the basis of sustainable development in the context of lifts can be achieved at the modernisation stage by repeated (further) use of as many components as possible. An example of this is the guide rail system, the reuse of which is possible after a prior assessment of its wear and tear.

Unleashing the potential of leather waste: Biogas generation and cost savings through semi-continuous anaerobic co-digestion

Leather processing is notorious for generating substantial amounts of polluting and putrescible organic waste, usually ending up in landfills or incineration. This study aimed to assess the potential of biogas production, waste treatment efficiency, and energy and cost savings benefits when scaling up the anaerobic co-digestion of leather processing wastes. The study focused on three waste types: tannery primary sludge (TPS), leather fleshings waste (LFW), and tannery wastewater (TWW). Semi-continuous anaerobic digestion experiments were conducted using three bench-scale reactors (R1-R3) over five phases; phases I and II were the startup and stabilization. In phase III, with an organic loading rate (OLR) of 0.6 kgVS/m3/d, the R2 reactor achieved an average of 0.323 m3 methane/kgVS added/day. This performance surpassed the other reactors by 39.14% (R1) and 41.29% (R3). In phases IV and V, using TWW instead of tap water for substrate dilution at different ratios (25–100%) reduced methane yield by 3.32–11.73% compared to the reactor that used tap water. The study further revealed that a medium-sized anaerobic reactor treating tannery wastes could reduce electric energy consumption by 3.64% and thermal energy consumption by 5.20%. This showcases the energy-saving benefits of co-digesting tannery wastes rather than disposing them in landfills. Using tannery wastes instead of traditional disposal methods resulted in approximately 94.68% savings in electric consumption and 45.03% in thermal energy consumption. This study offers a promising approach for sustainable leather waste treatment, biogas production, and considerable energy and cost savings compared to conventional disposal methods like landfilling.

Relationship between Socio-economic Factors and Electrical Energy Consumption of Customer Groups in Indonesia

The research aim was to study Socio-Economic Analysis and its Relationship with Electrical Energy Consumption of Customer Groups in Indonesia using secondary data from 2018-2022 covering 34 provinces in Indonesia. Data sources generally come from Central Bureau of Statistics (BPS) and State Electricity Company (PLN) Indonesia. The results of the analysis show that GDP per capita, education and MSMEs have a significant negative influence on poverty in Indonesia. Furthermore, GDP per capita is the only variable that has a significant positive effect on electricity consumption, while education, MSMEs and poverty have no effect on residential electricity consumption. In the industry group, all variables have a significant effect on household consumption, except for education which has an insignificant effect, GDP per capita and MSMEs have a significant positive effect on electricity consumption, apart from that, education and poverty also have an effect but are not significant in the Business group. The research results also show that poverty does not have a significant impact, but GDP per capita, education and MSMEs have a significant positive influence on social electricity consumption. Furthermore, in the Government Office Buildings (GOB) group, GDP per capita and MSMEs have a significant positive effect, however, education and poverty do not have an influence on electricity consumption in this group. Finally, in the Public Street Lighting (PSL) group, GDP per capita, MSMEs and poverty have no effect, but MSMEs have an influence on electricity consumption.

Simulations of Transients in a Four-Pole Magnetic Bearing with Permanent Magnets.

This paper presents the design of and transient time simulations for a four-pole magnetic bearing with permanent magnets. The usage of permanent magnets reduces the consumption of electric energy in comparison to a traditional active magnetic bearing. Permanent magnets are installed in the yoke of the stator core to limit the cross-coupling of the magnetic flux generated by the windings. The first part of this paper presents the design of the magnetic bearing and its finite-element model, while the second part describes the field-circuit indirectly coupled finite-element model for the transient time simulation. The presented simulation model was used to calculate the transient response for the rotor lifting from the starting position, the step change in the rotor position and the change in the rotor position under an external impact force applied along the y-axis.

Flexible demand-side management program in accordance with the consumers’ requested constraints

Increasing electrical energy consumption during peak hours leads to increased electrical energy losses and the spread of environmental pollution. For this reason, demand-side management programs have been introduced to reduce consumption during peak hours. The most important challenge of these programs is the low participation of consumers due to their special constraints. Hence, presenting a flexible demand-side management program that optimizes the consumption pattern of consumers in accordance with their requested constraints will have a significant impact on further participation of consumers in reducing the peak consumption. In this paper, a flexible demand-side management program is presented that provides the optimal consumption patterns, by using the stair-step pricing mechanism and considering the consumers requested constraints. The proposed method is carried out for a combination of consumers with various requested constraints such as the lowest and highest possible consumption per hour and the stability of the total consumption of each consumer in a certain period of time. The simulation outcome showed that the proposed algorithm is able to encourage consumers to participate more in energy management program by meeting their various requested constraints. Peak load total consumption experienced a decline of 25.09% from 36649.4 to 27454.3 kW-hours. As a result, the daily energy cost had been reduced by 10.27 % from 13854.466 to 12,431 dollars. This cost reduction was derived from reducing the need for additional energy generation during peak hours due to transferring consumptions to the lower-priced hours.

Lead-free perovskites-based photonic synaptic devices with zero electric energy consumption

Lead-free perovskites-based photonic synaptic devices with zero electric energy consumption

The effectiveness of geothermal systems in cooling residential buildings: a case study of a residential building in Alexandria, Egypt

AbstractThe urbanization of cities, the corroding of green areas, and the increasing demand for electric energy lead to the formation of heat islands in cities and the appearance of the global climate change phenomenon.Therefore, it was necessary to resort to the use of renewable energy sources, such as geothermal energy, to be used in different applications, as it can be used to cool buildings in cities during the summer.This research deals with the benefits of using geothermal energy systems, their different types, and the possibility of their application in Egypt. Also discussing the effectiveness of the vertical closed geothermal system in residential buildings in Alexandria Governorate in Egypt to reach an answer to a question.The effectiveness of the geothermal energy system in residential buildings is to reduce the problem of rising temperatures, energy consumption for cooling, and carbon emissions and thus reduce the problem of the formation of heat islands in cities and the appearance of the global climate change phenomenon and reaching a sustainable, environmentally friendly building that achieves thermal comfort for humans through the use of a simulation program called TRNSYS-17, through which the current situation of the building was compared and the addition of a vertical closed geothermal system was assumed, the extent of its effectiveness was compared in the whole building, and the cost of a vertical closed geothermal system and a traditional air conditioning system (HVAC) in a building was compared (case study).Hence, the efficiency of the vertical closed geothermal system appeared to reduce electric energy consumption and carbon emissions in the whole building at Alexandria in Egypt, especially the ground floor, which reached thermal comfort for humans and worked to reduce electricity consumption and carbon emissions by up to 22.93% in the building as a whole.

Surface and quantum chemical parameters of nickel oxide nanostructures suited for ultraviolet-assisted cationic dye degradation

Nickel oxide (NiO) nanostructures were synthesized through chemical precipitation and subsequently analyzed using a scanning electron microscopy (SEM) and X-ray diffraction (XRD). Rietveld refinement of XRD data revealed a cubic structure with lattice parameters of a = b = c = 4.173 Å. Fourier transform infrared spectroscopy and energy dispersive X-ray were employed to analyze the functional group and elemental composition of NiO NPs. The ultraviolet diffuse reflectance spectra indicated an optical band gap of 3.08 eV for synthesized NiO nanoparticles. Surface characteristics were evaluated using the Gwyddion open-source application, and parameters including Ra (mean roughness), Rq (mean square roughness), Rsk (surface skewness), and Rku (kurtosis coefficient) were calculated. The chemical properties of NiO were investigated through density functional theory calculations, and the results aligned well with experimental data. Furthermore, a comparative analysis of the photodegradation of methylene blue (MB) and rhodamine B (RhB) in the presence of UV light was examined, and it followed pseudo-first-order rate kinetics with degradation efficiencies of 82.62% (MB) and 71.31% (RhB), respectively. The electric energy per order for the photodegradation process was calculated to be 9.4 × 102 kWh/m3/order (MB) and 11.7 × 102 kWh/m3/order (RhB). Notably, the low electric energy consumption per order indicated a cost advantage for the reactor setup.

Do climate change, access to electricity and renewable energy consumption matter in aquaculture production in Africa?

AbstractThe contribution of aquaculture to economic development cannot be overemphasized. Several factors affect aquaculture production. However, few studies document the impact of climate change, electricity and other macroeconomic covariates on aquaculture production in Africa. The present research's objective is to examine the impact of rainfall, temperature, access to electricity, per capita national income, renewable energy consumption, employment in agriculture, and carbon emissions on aquaculture production in 32 African countries. We rely on panel data using rigorous estimation techniques involving the fixed effects and method of moment quantile regression approaches. Our fixed effects model result indicates that an increase in temperature reduces aquaculture production, while renewable energy consumption, net per capita income, employment in agriculture, and carbon emissions increase aquaculture production. Similarly, the 75th and 90th quantiles of the method of moment quantile regression results indicated that both rainfall and temperature decrease aquaculture production, while renewable energy consumption, employment in agriculture, and carbon emissions increase aquaculture production. The study provides useful insight into the climate, economic, and technological factors that might increase or decrease aquaculture production in Africa and similar contexts. Overall, our findings are important for improving aquaculture production in Africa, particularly with the current low production relative to the global north. The results have implications on the current and future climate action that calls for increased reliance on renewable energy and targeting improvements in agricultural employment, and net national income. Additional efforts are needed to achieve carbon neutrality while ensuring sustainable aquaculture production in Africa.

The impact of climate change on an office building in Portugal: Measures for a higher energy performance

Even though global warming is expected to raise the energy demand in office buildings, most energy analyses and design studies neither consider its impacts nor adaptive energy solutions. This study evaluates the effects of future climate on the energy demand of an office building in Portugal and proposes mitigation measures to improve its energy performance and environmental sustainability. The study simulates the energy demand of the building in 2055 and 2090 under different future scenarios using data from the latest climate model experiments, considering systems, envelopes, and operations interventions, and assesses the potential of photovoltaic panels to meet the energy demand. The results show that the interventions may reduce electric energy consumption between 16 % and 25 %, and the photovoltaic panels can meet 23 %–59 % of the total demand, depending on the scenario and the year. However, storage technology and equipment efficiency must evolve favorably to reach low energy. The findings reveal if a building designed and optimized for the current climate will remain optimal in the future and demonstrate the benefits of applying cleaner production and sustainable consumption principles to the office building sector. The study provides valuable insights for practitioners and policymakers.

Визначення граничних величин споживання електричної енергії засобами оптимізаційного моделювання

In the heating season of 2022/2023, as a result of the military aggression of the Russian Federation and targeted attacks on electric power facilities, a significant shortage of electric energy occurred in the Integrated power system of Ukraine. Restriction schedules and emergency disconnection of consumers were forcibly applied. In the conditions of such an unprecedented violation of the security of electricity supply, the problem of determining the limit values of electric energy and power consumption has gained new relevance for the electricity market participants. In this study, the problem of determining the optimal limit values of electricity consumption based on the criterion of maximum income from its sale to three groups of consumers was set and solved: "Critical infrastructure", "Households" and "Non-household consumers". The formation of the three specified groups is related to price discrimination in the electricity market and the need to supply critical infrastructure facilities without limits. The decision variables in the optimization model are proposed to be specified in fractions of the provision of electrical energy needs (unit fractions), which allows for establishing equal conditions regarding restrictions for all distribution system operators. To take into account the social significance of electric energy as a commodity, an additional constraint was included to the basic optimization model: the lower limit of the decision variable for the "Households" group. Approbation of the proposed optimization model was carried out using spreadsheet modeling in MS Excel on reported data on the results of electrical load measurements on regime days. The results of computational experiments are presented for the conditions of different values of the deficit of electric energy in the Integrated power system of Ukraine and different values of the additional constraint for the «Households» group, in particular, quantitative estimates of the consequences of the included constraints for the functioning of the electricity market. The proposed method of determining the limit values of electric energy consumption allows to formalize the procedure for decision-making according to predetermined rules and thereby achieve a fair distribution of limited resources. Keywords: electric energy consumption, shortage, limit value, optimization modelling, spreadsheet model.

CHALLENGES AND OBJECTIVES IN THE IMPLEMENTATION OF ELECTRIC AUTOMOTIVE MODELS IN BRAZIL

The article addresses the implementation of electric cars in Brazil, highlighting fundamental challenges and objectives. Amid the search for solutions, the technological transition presents complex challenges, such as the need for efficient charging infrastructure, economic considerations and overcoming barriers in the primary energy sector. The main objective is to understand and address obstacles, from expanding the charging network to issues related to costs and the energy matrix, in order to guide public and social policies. Furthermore, it highlights the importance of partnerships, public incentives and comprehensive strategies to make electric cars not only a viable option, but also economically competitive compared to fossil fuel-powered vehicles, highlighting the need for sustainable energy solutions to support the projected increase in electrical energy consumption.

SELECTION OF THE OPTIMAL METHOD OF INTENSIFICATION AND STABILIZATION OF OIL PRODUCTION IN THE FIELDS OF WESTERN KAZAKHSTAN

The article discusses research aimed at determining the effectiveness of measures to intensify oil production in the fields of Western Kazakhstan. Based on the results obtained, recommendations were developed for the further application of oil production intensification methods for the conditions of West Kazakhstan fields. The highest oil displacement coefficient (ODC) in the development of high-viscosity oils can be achieved using thermal production methods. To reduce viscosity, in practice, deep warming of the bottom-hole zone of the well is used, which can be carried out by electrothermal treatment of the bottom-hole zone of the formation, steam treatment of wells using downhole solid fuel heat generators, and so on. A combined heating method is proposed that allows heating the well products. Heating is provided by a solar panel all year round. In case of a decrease in solar activity, it automatically switches to a constant electric current. This method differs from others in that the solar panel continuously supplies electricity, reducing the consumption of electrical energy. In addition, the article presents the results of studies of the optimal heating temperature of the bottom-hole formation zone, potential well flow rates at this temperature and oil viscosity. Recommendations are given on the most rational way of heating the bottom-hole zone of wells in the fields of Western Kazakhstan.

Technical feasibility study of the integration of the solar photovoltaic system for a hospital: a case study of Qom City, Iran

The purpose of the study is to investigate the overall effect of photovoltaic (PV) systems located on the roof and window shades on reducing the amount of heating and cooling energy consumption of a hospital in Qom, Iran. The use of solar panels on the roof and windows, in addition to producing Electric power and reduction of electricity consumption, causes shadows on the roof and windows. The created shadow can reduce the energy consumption of heating and cooling systems in particular. In addition, the electrical energy obtained from the solar panels can be used for the purpose of using the hospital lighting system. The thermal simulation for a six-story hospital with an area of 5000 thousand square meters in Qom, located in Iran, was modeled by the Energy Plus simulation engine. Given that 80% of the roof can be used for solar panels. The obtained results show that the use of photovoltaic systems on the roof and window shades can save cooling energy consumption by 18% per year and 32% in summer. In addition, the use of solar panels saves 15% of the electric energy consumption of the fan coil and 30% of the chillers.

Audit Dan Peluang Penghematan Energi Listrik CV Tirta Windu Agung 3 Probolinggo

The use of electrical energy in the building and industrial sectors is very important, especially the use and allocation of funds spent is quite large. So it is necessary to use energy as efficiently as possible. So there is a need for an energy audit to determine the level of electrical energy consumption used, where the results will be compared with predetermined standards. This research was carried out at CV Tirta Windu Agung 3 using a PM5100 and lux meter. From initial audit calculations, the IKE value was found to be 13.42 kWh/m2/year. This IKE value is the total of the buildings and ponds. The IKE value still includes very efficient criteria. Based on the results of detailed audit calculations, the value obtained before improvement was 2.23 kWh/m2/year. The IKE value still includes the criteria for being very efficient or meeting standards. After improvements it became 1.65 kWh/m2/year. Energy saving opportunities are available in indoor and outdoor lighting systems by replacing CFL (compact fluorescent lamp) lamps with Philips LED lamps. Based on calculations, the savings in electrical energy costs are IDR 41,736/day, resulting in savings of IDR 15,233,640/year. Based on the Isc/IL calculation above, it can be seen that the Isc/IL value is 165.4. According to the IEEE 519-2014 standard, the ISC IL value in the range >1000 has a permissible THDi value limit of 15%. The nominal voltage used is 0.4 kV, so the permitted THDv is 8%. Based on table 3.9 THDv and THDi under standard conditions.

Forecasting the Electricity Consumptions of PLN UP3 Cengkareng using Deep Learning

The consumption of electrical energy for the community every year has increased including the electricity consumption of PLN UP3 Cengkareng customers. Therefore, PLN UP3 Cengkareng must supply electricity to customers in all categories such as Social Category, Household Category, Business Category, Industry Category and Government Category. With customer needs that continue to increase, it is necessary to forecast future electricity needs, so that PLN UP3 Cengkareng can provide the required electrical power. For this reason, it is necessary to predict the electricity demand. This research was conducted to forecast the electricity demand of UP3 Cengkareng by using the Deep Learning Model Long Short-Term Memory (LSTM). The data set used in this study was taken from the PLN UP3 Cengkareng information system, for 10 years, the period from 2012 to 2021. The data used is divided into 2 categories, namely 70% training data and 30% testing data. The results obtained from this prediction are 96,689, with an average neuron value of 32 and an epoch value of 10.

Controllable Pyridine N-Oxidation-Nucleophilic Dechlorination Process for Enhanced Dechlorination of Chloropyridines: The Cooperation of HCO4- and HO2.

Dechlorination of chloropyridines can eliminate their detrimental environmental effects. However, traditional dechlorination technology cannot efficiently break the C-Cl bond of chloropyridines, which is restricted by the uncontrollable nonselective species. Hence, we propose the carbonate species-activated hydrogen peroxide (carbonate species/H2O2) process wherein the selective oxidant (peroxymonocarbonate ion, HCO4-) and selective reductant (hydroperoxide anion, HO2-) controllably coexist by manipulation of reaction pH. Taking 2-chloropyridine (Cl-Py) as an example, HCO4- first induces Cl-Py into pyridine N-oxidation intermediates, which then suffer from the nucleophilic dechlorination by HO2-. The obtained dechlorination efficiencies in the carbonate species/H2O2 process (32.5-84.5%) based on the cooperation of HCO4- and HO2- are significantly higher than those in the HO2--mediated sodium hydroxide/hydrogen peroxide process (0-43.8%). Theoretical calculations confirm that pyridine N-oxidation of Cl-Py can effectively lower the energy barrier of the dechlorination process. Moreover, the carbonate species/H2O2 process exhibits superior anti-interference performance and low electric energy consumption. Furthermore, Cl-Py is completely detoxified via the carbonate species/H2O2 process. More importantly, the carbonate species/H2O2 process is applicable for efficient dehalogenation of halogenated pyridines and pyrazines. This work offers a simple and useful strategy to enhance the dehalogenation efficiency of halogenated organics and sheds new insights into the application of the carbonate species/H2O2 process in practical environmental remediation.

Multifunctionality Analysis of Structural Supercapacitors— A Review

Structural supercapacitors (SSCs) are multifunctional energy storage composites (MESCs) that combine the mechanical properties of fiber-reinforced polymers and the electrochemical performance of supercapacitors to reduce the overall mass in lightweight applications with electrical energy consumption. These novel MESCs have huge potentials, and their properties have improved dramatically since their introduction in the early 2000’s. However, the current properties of SSCs are not sufficient for complete energy supply of electrically driven devices. To overcome this drawback, the aim of the current study is to identify key areas for enhancement of the multifunctional performance of SSCs. Critical modification paths for the SSC constituents are systematically analyzed. Special focus is given to the improvement of carbon fiber-based electrodes, the selection of structural electrolytes and the implementation of separators for the development of more efficient SSCs. Finally, current SSCs are compared in terms of their multifunctionality including material combinations and modifications.