A Case Study of Energy AuditingmA Tool for Energy Conservation in Industry

In order to attain the best energy efficiency in an industrial plant, an energy audit is a prerequisite process for identifying the general energy consumption condition and to hence identify the measures that need to be taken to save the cost of excessive energy consumed and later to retrofit the faults that were observed. The case study presented in this paper is a medium industry plant located in Hebron. The audit methodology, observation, and audit results will be presented and discussed with the recommendation drawn.

Auditing and Energy Efficiency of a Ready-Made Garment Factory in Bangladesh: A Case Study

The possibilities for improving energy efficiency in ready-made composite garment factories in Bangladesh are assessed in this study. This work aims to understand the impacts of energy consumption on garment production and determine the scope of energy efficiency improvement based on energy-related data collected from a garment factory over a three-year period (2018-2020). Data from 2018 is used as the baseline and is compared to data from 2019 and 2020. It has been discovered that energy consumption has a seasonal impact. Despite the fact that electricity consumption decreased significantly during the 2020 pandemic, the energy consumption pattern in 2020 was found to be similar to that of 2018 and 2019. To improve energy efficiency, recommendations are made to modify the boiler, water pumps, gas generators, electrical motors, and lighting systems in specific ways. These suggested actions could save BDT 95 million (1.15 million US dollars) on power generation and BDT 20.5 million (0.25 million US dollars) on natural gas used for power and heat generation. These would result in a 3.75 percent reduction in the unit (kWh/kg) production energy requirement and a 3.65 percent reduction in natural gas usage per unit production, respectively, when compared to current conditions. Furthermore, these changes will provide an opportunity to reduce greenhouse gas emissions by 9.78%.

Assessment of the Implementation of Energy Conservation Opportunities Arising from Energy Audits;A Study of Four-Star and Five-Star Hotels in Nairobi Kenya

This study assesses the implementation of energy conservation opportunities in four-star and five-star hotels in Nairobi. The Covid-19 pandemic had a significant impact on the Hospitality Industry. Currently, there is a growing inclination to furnish guests with superior and sustainable services in an energy-efficient and eco-friendly way. Comprehensive research was conducted from energy audits gathered from the establishments and contracted auditing companies, on top of this, hotel staff were given digital questionnaires. To add to the data, the researcher surveyed the hotels with engineering managers. The Energy Audits found that all 10 hotels had adopted Energy Conservation Opportunities (ECOs). After further analysis, the mean adoption rate of Energy Conservation Opportunities (ECOs) during the past three years was 55.83%, which was below the aim of 100%. According to studies, hotel staff manages energy to cut costs. The researcher found that hotels use up a lot of energy. However, they have conservation potential, depending on government policies, costs, ease of implementation, and management commitment to sustainable practices. Essentially, Energy Conservation Opportunities (ECOs) reduce energy expenditures and boost reliable revenues, especially during high energy prices and uncertainty.

Stability Study of Low Voltage Electrical Distribution Network: Audit and Improvement of DJEGBE Mini Solar Photovoltaic Power Plant in the Commune of OUESSE (Benin)

The supply of quality energy is a major concern for distribution network managers. This is the case for the company ASEMI, whose subscribers on the DJEGBE mini-power station network are faced with problems of current instability, voltage drops, and repetitive outages. This work is part of the search for the stability of the electrical distribution network by focusing on the audit of the DJEGBE mini photovoltaic solar power plant electrical network in the commune of OUESSE (Benin). This aims to highlight malfunctions on the low-voltage network to propose solutions for improving current stability among subscribers. Irregularities were noted, notably the overloading of certain lines of the PV network, implying poor distribution of loads by phase, which is the main cause of voltage drops;repetitive outages linked to overvoltage caused by lightning and overcurrent due to overload;faulty meters, absence of earth connection at subscribers. Peaks in consumption were obtained at night, which shows that consumption is greater in the evening. We examined the existing situation and processed the data collected, then simulated the energy consumption profiles with the network analyzer “LANGLOIS 6830” and “Excel”. The power factor value recorded is an average of 1, and the minimum value is 0.85. The daily output is 131.08 kWh, for a daily demand of 120 kWh and the average daily consumption is 109.92 kWh, or 83.86% of the energy produced per day. These results showed that the dysfunctions are linked to the distribution and the use of produced energy. Finally, we proposed possible solutions for improving the electrical distribution network. Thus, measures without investment and those requiring investment have been proposed.

Energy Saving and Power Factor Correction for Industrial Plants in Hebron District

Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.

Status quo and countermeasures of energy audit in oil and gas field enterprises

To develop energy audits in oil and gas field enterprises has important and realistic significance. Chinese energy audit in oil and gas field enterprises is still in the exploratory stage, the paper puts forward some countermeasures and proposals through the analysis on status quo to identify the shortcomings.

Energy Audit in the Meat Processing Industry—A Case Study in Hermosillo,Sonora Mexico

The meat processing industry, due to its high energy consumption, needs to be assessed in an energy usage basis. This paper reports the results and implications of an energy audit in a meat processing industry. In addition, this work provides a comprehensive and practical approach to energy saving measures in the assessed company to recognize factors that can determine a possible transition to sustainable patterns of electricity consumption. The paper described the application to energy auditing, developed by AFNOR (2014) for efficient energy management along with ISO 50001 (energy management systems). For a more specific energy auditing the guide described by Dall “O” (2013) was used. In this case, a study of an integrative characterization of the company’s energy consumption is made. The research has been divided in two main sections: the first includes an analysis about the characterization of the energy consumption within a meat processing company in the three sustainable approaches such as economical, societal and mainly environmental implications;second, a proposal for strategic energy management measures focusing on high consumer types of facilities. The results obtained allow the identification of main processes with significant correlations in terms of energy consumption within the company. This data has the potential for energy savings. The data acquisition process prompts the development of practical and accessible energy efficiency measures. In addition, a benchmarking analysis with several tools is performed. Altogether, this work gives guidance on the implementation of energy auditing in industries within its geographical and industrial sector limitations.

Main Results of an Energy Audit in a Milk Processing Industry in Taquara,Southern Brazil

The industrial energy diagnosis presented in this work occurred in a milk product cooperative, from an analysis of energy consumption in the main milk industrialization and a diagnosis of energy end uses of lighting and cooling systems. Almost all stages of milk industrialization are used hot water and steam generated in the boilers. The largest electricity consumption in this sector is by electric motors followed by cooling needed to maintain the quality of milk products. Because energy costs represent a significant portion of the monthly cost of the company, an analysis of the energy costs of the past two years to check the consumption of active and reactive energy and power demand contracted is performed. This paper presents the main results of an energy audit in a milk processing industry in southern Brazil.

A pragmatic retrofitting approach to enhancing the thermal,energy and economic performance of an educational building:a case study in Malaysia

Building retrofit procedures play a crucial role in improving the energy performance and economic indicators of a building.In this context,an energy audit is typically recommended,but it is seldom used as a comprehensive approach due to the complexity and associated costs.This article aims to conduct a holistic energy audit approach for a university building in Malaysia,with the objective of diagnosing energy efficiency deficiencies,identifying areas of energy waste and proposing practical retrofit measures accordingly.The approach involved multiple stages,including measurements,surveys and simulation work.Eight energy-saving measures were proposed,targeting improvements in envelope elements,cooling and lighting systems,and operation and control.The Design-Builder software was utilized for energy simulation,assessing the annual energy savings.Economic evaluation indices,such as net present value and simple payback period,were used to assess the economic feasibility of the measures.The results demonstrated significant potential for energy reduction,with each measure achieving annual energy reductions ranging from 2%to 18%,and a cumulative im-pact of 41%on annual energy consumption when combined.The investment payback period for the energy-saving measures varied from 0.8 to 8.9 years,with a payback period of 3.9 years for the combined energy-saving measures.Furthermore,the net present value was positive,indicating the economic feasibility of investing in the proposed energy-saving measures.These findings provide valu-able energy-saving opportunities that can be applied to improve similar buildings on the university campus.

Achieving energy efficiency in government buildings through mandatory policy and program enforcement

Government buildings are responsible for a significant proportion of energy consumption worldwide,for example, in Australia, up to 41.5 PJ energy was consumed by government buildings in 2011–2012. While the newly constructed buildings may be energy efficient,the existing buildings, which account for more than 85% of the total building stock, were built prior to the time when energy rating systems was put in practice and are consequently energy inefficient to a large degree. Reducing the energy consumption in existing government buildings is essential, as it will not only reduce the costs and environmental impacts, but also show governments' strong commitment towards the reduction of greenhouse gas emission. Furthermore, successful building energy retrofit projects are the showcases to the general public, encouraging other sectors(e.g. commercial) to conduct building retrofits for energy savings. Recognising these benefits,several state governments in Australia have introduced building energy efficiency policies and programs. This paper reviewed the energy efficiency policies/programs in five States in Australia: Victoria, New South Wales, South Australia, Western Australia, and Queensland in terms of respective policies and targets, implementation methods and current progress. The lessons learned from these programs were also discussed. This research revealed that the key factors for a successful government buildingenergy retrofitting program are 1) having a properly enforced energy efficiency mandate with clear energy saving targets, 2) establishing an expert facilitation team and 3) implementing suitable financing and procurement methods.