You are currently browsing the tag archive for the ‘energy efficiency’ tag.

The Department of International Development has awarded South Africa’s National Business Initiative (NBI) £8,6-million to bring energy efficiency supprt to companies in various sectors… (more)

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Like many other perennial debates, the one about the rebound effect simply refuses to go away. The basic argument is that if you replace an inefficient car, or light bulb, or refrigerator with a more efficient one – everything else being equal – the typical consumer will drive farther, use more light and buy bigger fridges virtually cancelling any energy efficiency gains. Those who subscribe to this theory claim that making appliances and electricity consuming devices more efficient is mostly counter-productive because consumers will simply use more… (more)

Identifying and using the independent parameter for quantifying savings achieved by an energy efficiency pumping project… (more)

Energy efficiency has a significant impact on energy savings and, according to Schneider Electric, technologies designed to lower energy costs could cause unexpected power quality issues… (more)

Motors, lighting, facility wiring, distribution panels, protective devices, transformers and switch gear all experience a wide range of phenomena that combine to create energy losses. Identifying and calculating the sum of all losses is an extremely challenging engineering proposition that requires knowledge of all factors that impact operating efficiencies… (more)

Copper is clearly the best electrical conductor at an affordable price. With an electrical conductivity of 5,97 x107 S/m, it is an indispensable material for achieving a compact installation with high energy efficiency. And it is a fact that energy efficiency can be improved even further by increasing the cross section of the copper conductor, thus providing a positive impact on the environmental footprint and the life cycle cost of the installation. One additional kilogram of copper conductor will typically save between 100 and 7500 kg of greenhouse gas emissions… (more)

Integrating disparate systems within facilities helps facility owners and managers achieve synergies that would otherwise not be possible with the traditional silo approach to managing HVAC, lighting, access control, security, fire & life safety and communications systems… (more)

Current legislative demands have led to an increase in the complexity of modern wastewater treatment adhering to effluent limits at the plant’s outlet. Furthermore, energy cost trends show that energy efficiency is growing in importance in wastewater treatment and industry in general. The challenge and (future) key to success for operators will be their ability to manage required plant reliability, reduce complexity and optimise energy efficiency… (more)

Lighting consumes some 20% of all electricity produced and is responsible for about 35% of a typical building’s electricity use. Much of this energy is wasted on poor lighting design, inefficient lighting equipment and poor controls… (more)

A national project was introduced in 2010 to improve the capacity of South African industry to use energy resources more efficiently and productively, now and in future years. This article focuses on energy management and cost-effective systems optimisation techniques… (more)

Typical instant water heaters have manually selectable discrete power settings to match the desired temperature. Such systems may use more energy than required by operating above the temperature command… (more)

Typical instant water heaters have manually selectable discrete power settings to match the desired temperature. Such systems may use more energy than required by operating above the temperature command. Switch-mode AC voltage controllers, on the other hand, can provide continuous adjustment of output power and have better temperature regulation capabilities when controlled in closed-loop mode… (more)

Water usage at different deep-level mines varies greatly, between 1,25 kl and 4,15 kl per ton of rock mined, which means that some mines may be using water inefficiently. We identified three techniques to reduce water wastage and the subsequent water consumption of deep-level mines. These include leak management, stope isolation control and supply water pressure control. The outcome of the evaluation at mine 1 led to the implementation of all three water reduction techniques… (more)

Over the past century, mankind has beneficiated the Earth’s natural resources to improve their standard of living. In the process, many of the non-renewable resources, mainly fossil fuels, have become depleted. This has had the effect of increasing the cost of these increasingly scarce resources, incentivising people to look for alternatives, as well as investigating means to use the existing resources more productively… (more)

This paper presents a case study and energy efficiency analysis of the 405 km, 420 kV transmission line between Insukamini substation in Bulawayo in Zimbabwe and the Matimba thermal power station in South Africa. Three scenarios were evaluated and an analysis was made on the energy efficiency of the load with respect to the three scenarios by means of a simulation model… (more)

Eskom International divisional executive Dr. Steve Lennon says interest in the eta Awards, which Eskom has sponsored since 1985, was at an “all time record level”… (more)

The electricity supply constraints in South Africa necessitated the implementation of demand side management (DSM) projects. The focus of this study is to determine the most cost effective load management strategy on an underground mine dewatering system.The mining sector was selected as it is one of the largest electricity consumers in South Africa. A substantial amount of energy is used to de-water the mining shafts of fissure and service water. Improved load management will result from automating the de-watering system… (more)

South Africans have traditionally been divided between a first world and a third world community. As far as energy is concerned the first world community primarily made use of electricity for residential, commercial and industrial purposes. However, electricity stayed “cheap” and nothing really dampened the increasing consumption of this commodity… (more)

The South African government has announced tax rebates using Section 12i, the Industrial Policy Project Investment incentive, for manufacturing-related projects with a 10% energy demand reduction component and, more recently, the proposed 12L “Regulations on the allowance for energy efficiency savings”. Both these tax incentives are sections of the Income Tax Act of 1962 and are used by government as instruments to encourage economic development… (more)

This study compared electricity consumption in two buildings of similar architectural design and floor space. One was retrofitted at a cost of R4,3-million. Results are significant. Metered and billed energy consumption for the retrofitted building exceeded that of the older building…  (more)

Over the past few months there has been much written about renewable energy, more efficient use of energy, sustainability and many similar buzz words. Perhaps the reality for us in South Africa is the fact that electricity is now expensive and this is starting to affect our pockets and companies’ bottom lines.It is ironic that for a nation that considers itself environmentally conscious, it has to be the effect on our pockets that spurs us on to take some action… (more)

The study emphasized the value of good energy management practices in the fruit supply chain and that a benchmarking system is a good tool to use as starting point for energy efficiency improvement in the fruit industry. It was further shown that there is a need to identify the main reasons for differences in energy consumption and use this as a basis for creating a set of guidelines for good energy practice… (more)

On the premise that it is impossible to manage what cannot be measured, for large energy users – i.e. those other than residential – the active energy efficiency process should start with an assessment of how and where energy is used, and how much of it is consumed… (more)

This study sought to determine the amount of power used by a typical household for the purposes of home entertainment. As more and more people choose to purchase more elaborate home entertainment equipment, the per-household power draw of such devices will only continue to increase… (more)

This paper gives an overview of domestic usage of energy and describes how sound energy management practices can be employed to improve sustainability as well as the “triple bottom line” of domestic users… (more)

A new turbine generator is an important component in the use of “waste gas” to generate electricity. Many industrial processes release and waste surplus energy. The recovery of untapped energy potential is therefore a crucial part of the fight against global warming. An ambitious energy recovery research project, is soon to start production. In many industrial processes, process gas escapes unused into the atmosphere. The basic idea is to tap these gases for the further generation of energy… (more)

Growing acceptance of the need for energy efficiency to reduce carbon emissions and energy costs has led to hotels and resorts focusing their attention on ensuring that their guests not only enjoy superior facilities and service, but also a “green” experience… (more)

Growing acceptance of the need for energy efficiency to reduce carbon emissions and energy costs has led to hotels and resorts focusing their attention on ensuring their guests not only enjoy superior facilities and service, but also a “green” experience… (more)

In large industrial plants that often contain several thousand motors to provide the necessary motion, any unplanned or sudden motor stops can lead to faults in the process sequence, which can be very cost-intensive. For this reason, reliable  management and protection of these motors is of vital importance for ensuring a controlled production sequence… (more)

Simple changes to a commercial property’s lighting scenario can go a long way towards improving energy efficiency. Taking into consideration the fact that lighting accounts for between 37% and 45% of electricity consumption in office buildings, interventions to this end make for sound financial and energy savings sense… (more)

The market of electrical installation in residential building is very price sensitive. If you cannot differentiate your offers and services from your competition, you could struggle to survive… (more)

by Chris Yelland, managing director, EE Publishers

In recent months and at various venues Eskom has been lobbying and punting the view that a new dispensation and enabling environment is required for the utility to secure the cheap and abundant supplies of coal needed for its current and future fleet of coal-fired power stations. When pressed for details, Eskom officials become a little coy. But stripping aside the euphemisms, what Eskom is saying is that, in the light of higher global demand and world market prices for even the low-grade coal used in Eskom power stations, the utility is having difficulty matching these prices and contracting on a voluntary basis with the coal miners to secure its medium and long-term coal supplies… (more)

Prof. Nico Beute of the Cape Peninsula University of Technology, well-known in the industry for his enthusiastic devotion to energy, was inducted into the Southern African Association for Energy Efficiency’s (SAEE’s) prestigious Dr Ian Ernest Lane Hall of Fame. The SAEE’s Hall of Fame was established in August 2009 and is bestowed annually on an individual whose service, dedication, commitment and selfless hours were given to the energy industry… (more)

Buildings are responsible for 40% of primary energy consumption world-wide and around 21% of greenhouse gas emissions. But the potential for savings is also considerable… (more)

The Ecube is a temperature mimicking sensor designed for energy reduction in commercial and industrial refrigeration systems. The core of the Ecube simulates the core thermal properties of fresh produce, meat, dairy, fruit, vegetables etc… (more)

Eskom and the Department of Energy announced the winners of the 21st annual eta Awards at a gala banquet and awards ceremony at Kayalami on 4 November 2010. The purpose of the eta Awards is to reward exceptional effort in the efficient use of energy by individuals, students, companies or institutions… (more)

With dramatically rising electricity costs set to have a significant impact on the energy budgets of most organisations, many companies are looking to reduce power consumption without compromising the availability of computer, security and other business-critical systems. It is a target that is being set by many organisations as they get ready for the three scheduled hikes in electricity costs… (more)

By positioning it directly on the thermostat sensor, the eCube reduces the number of compressor starts and run time. It lets the control system measure the temperature of the products in the refrigerated space, not the air temperature, thus providing a more stable and consistent temperature in the refrigerated space… (more)

Since the dawn of the industrial revolution, humankind has managed to extract ever increasing amounts of fossil fuels to feed a growing global economy. Every now and then an obstacle would present itself, but human ingenuity and advancements in technology would typically fix the problem… (more)

Following the “dark days” of rolling mass load shedding in South Africa, and with the constant media coverage of the current and expected “bleak” energy outlook in the country until 2014, various key stakeholders in the energy industry have radically changed their thinking and climbed on the energy efficiency “bandwagon” … (more)

The accurate and intuitive control of public lighting is an important way to save energy and enhance safety. This applies above all for lighting solutions where safety standards dictate that the lights have to be on round the clock at different brightness levels, depending on the time of day… (more)

South Africa’s environmental problems are well known: a shortage of water, serious air pollution, and over-farmed land make green solutions – including ‘greener buildings’ – more important than ever. Establishing and managing a truly green building can seem like a daunting challenge for the owners or operators but the returns undoubtedly exceed the initial capital outlay, manpower and time spent to achieve it… (more)

The global trends and challenges driving the need for industry to improve energy efficiency are well known. The growing population and economic development in many countries throughout the world has caused energy and transportation fuel consumption to increase and refiners around the world are increasing capacity to meet these needs.Higher oil and gas prices have greatly increased energy related operating costs and emphasised the need to increase energy efficiency… (more)

If you have a bright energy-saving idea or have developed an innovative process for saving electricity, you could find yourself being rewarded with a cash prize of R30000 for your efforts as well as an eta award. This will be handed over at a gala event in Johannesburg towards the end of October 2010… (more)

The main drivers for the resort implementing electricity efficiency measures is firstly to satisfy Eskom’s requirement to reduce electricity consumption and to mitigate the chance of incurring significant electricity consumption penalties in the forthcoming years. The resort also has a strong policy of continuous improvement, pushing the need for increased electricity efficiency. The interventions have reduced the resort’s electricity consumption by an average of 22% compared to the base year… (more)

Leading players in the world of power consumption are calling for electrical contractors to join forces with value added resellers (VARs) to promote the adoption of more efficient energy use and less wastage in power consumption. The Schneider Electric group believes that every person and every business worldwide is going to be affected by the energy challenge. It maintains that while the world does have many energy sources that will last many generations, we stand to destroy the planet in a few generations if they become depleted… (more)

For a number of years, products have been developed that can contribute substantially to the efficient use of electrical energy, immediately after installation.  A number of initiatives began to emerge from government (Department of Minerals and Energy) and Eskom which include, among others, the Energy Conservation Scheme, Smart Systems and Solar Water Heating programmes… (more)

A Brazilian motor manufacturer is finding ways to build motors that make them inherently more energy efficient. With the growing demand for energy in a burgeoning global population, it may not be possible to keep up with demand. However, an alternative is to decrease the actual energy required in specific industrial and mining applications, by increasing the energy efficiency of electric motors… (more)

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