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High voltage alternating current (HVAC) has been used for many years as the means of transmitting bulk energy. However, HVAC lines incur increased losses as the distance becomes longer. This research investigates how energy could be transported with minimum losses when an existing HVAC transmission line is converted into a HVDC transmission system… (more)

“Reducing our carbon footprint” is heard in the corridors of power in many companies, but do people really understand what it means and how to walk the talk? Has it perhaps become more of a marketing ploy? If I could create a new entry in the dictionaries of the world, I would describe it as “optimising for efficiency” because achieving optimum operating efficiency will go a long way to reducing the carbon footprint!… (more)

Many organisations fail to consider water use when embarking on initiatives to reduce carbon footprint and conserve resources. The cost of electricity has continued to escalate in recent years and energy efficiency has become a focus area for business. Many organisations, however, fail to take into account one all-important area – water – when embarking on carbon footprint reduction initiatives and when looking to reduce resource usage to decrease cost… (more)

This article presents a method to estimate the power efficiency of an electric motor using only the supply current measurement and motor parameters… (more)

Voltage optimisation is the fastest growing energy efficiency technology intervention in major European economies… (more)

Voltage optimisation is the fastest growing energy efficiency technology intervention in major European economies… (more)

Midsize companies need innovative, secure and cost-effective ways to cut costs without disrupting current business operations. The right cloud solution offers midsize companies an advantage. All the while aiming to improve efficiency and employee productivity, enter new markets and find new opportunities, manage risk, improve business agility and retain customers… (more)

The topic of balancing coal mass flow to burners in coal fired power plants has become the focus for power plant optimisation.A range of instruments is available to provide the best results in terms of flow balancing. Analysis of burner performance indicates that a coal flow imbalance to the burners can have severe impact on the NO emissions and carbon in ash content… (more)

The size or power density of a power supply is a key criterion when selecting the optimum product for a given application. In applications where fans are not desirable due to noise or reliability concerns then efficiency becomes of primary concern… (more)

n 2009, Sedgeley Energy began a series of energy audits on common area portions of 18 shopping centres around the country. The aim of these audits was to make the centres more energy efficient, so as to reduce electricity costs, counteract tariff increases, avoid possible  penalties, increase asset value, and to help alleviate the South African energy crisis. This is achieved by reducing both the total energy consumed (kWh) and the maximum demand (kVA) of the centres though better control and retrofitting to efficient technologies… (more)

Energy in South Africa (as well as globally) has become a key area of attention in recent years. South Africa in particular has a larger than average problem as a result of the capacity shortages we face in the short term. With a requirement for 3000 MW of energy savings by 2012 being predicted, one of the key methods to address the problem is by energy efficiency targets being set and achieved in the private, commercial and industrial sectors… (more)

It is known that the load factors of some squirrel cage motors used in some industries have values in a region of 0,1 to 0,4. This value suggested that for relatively long periods the motors could run close to no-load, and that the motors are either grossly oversized or are cycling with significant time spent near no-load or idling duty… (more)

To date, making significant electricity energy savings within any facility has often meant making either significant shifts in process procedures, or making major investments across various technologies. The majority of “easy” savings in electricity have often come from introductions downstream of the mains distribution room… (more)

Many companies are beginning to consider the carbon consumption of their ongoing operations and realising that data centres are significant contributors to the environmental burden of business and industry. Research by APC-MGE and others is showing that efficiency varies widely across similar data centres, and – even more significant – the actual efficiencies of real installations are well below the practical achievable best-in-class values. A mathematical model that accurately represents the workings of a specific data center, and accepts as inputs the IT load, outdoor weather statistics, etc., could be used effectively in an energy management program… ( more)

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