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Power factor correction (PFC) is generally applied to save on maximum demand charges or power factor penalties levied by electricity distributers. If properly applied, PFC can also reduce energy consumption in many types of installation… (more)
Variable frequence drives (VFDs) replaced motor generator sets and DC drives because of improved process performance and reduced maintenance costs. When the energy crisis occurred in the early 1970s, saving energy became a critical goal and the use of VFDs quickly spread into large pump applications and eventually into HVAC fan systems… (more)
Food retailer Sainsbury’s in Leek, Staffordshire, UK, needed a trusted, reliable solution that would provide high-quality lighting for its first-ever, all-LED supermarket. The shop in Leek subsequently Information from GE Lighting became the first supermarket to use GE’s Lumination Linear suspended luminaire, a thin, uniformly illuminated lighting panel suspended from the ceiling and powered by Intrinsix optical technology… (more)
The energy saving potential in motor-driven applications is enormous: electric motors across all sectors account for some 67% of the world’s industrial energy use… (more)
The energy saving potential in motor-driven applications is enormous: electric motors across all sectors account for some 67% of the world’s industrial energy use… (more)
This paper looks at energy savings potentials in utilities in industrial processes. It presents a monitoring and targeting strategy proposal that will assist in realising sustainable energy savings in key energy user utilities in processes… (more)
This paper looks at energy savings potentials in utilities in industrial processes. We present a monitoring and targeting strategy proposal that will assist in realising sustainable energy savings in key energy user utilities in processes. We view the strategy from the basics of energy policy, examples of potential savings, through to the three key elements of an automatic monitoring and targeting solution (aM+T)… (more)
Today industry and commerce faces an energy challenge. Pressure to reduce energy consumption and to provide security of power is placed on supplies from governments, consumers, legislators and shareholders alike. These pressures emanate from a background of ever-rising energy prices.As a result, industry and consumers demand more energy efficient products.ABB continuously improves the efficiency of its motors and drives to fulfil these requirements… (more)
The long-awaited launch of International Standard ISO 50001 on 15 June 2011 has added further impetus to energy management in South Africa. The international community, and the International Organisation for Standardisation (ISO) estimates that the standard could have a positive impact on some 60% of the world’s energy use… (more)
Eskom Integrated Demand Management (IDM) has added a rebate programme on heat pumps to its hot water solutions initiative. The programme, which focuses on residential water heating, aims to facilitate the installation of at least 65 000 systems by March 2013 at a cost of R250-million, saving an estimated 54 MW of capacity… ( more)
The South African building industry would be doing more than just the environment a favour by convincing its clients to install solar water heating systems. Switching to solar in existing developments could save as much as 50% on the average household’s monthly electricity bill by reducing the amount of electricity used by a geyser by as much as 70%… (more)
A 3,8 kW rooftop photovoltaic generator has been installed on an energy efficient house built at the University of Fort Hare, Alice campus, South Africa. The system, located on the north facing roof, started generating electrical power in February 2009… (more)
South Africans will be mobilised to save electricity through the biggest energy saving movement ever seen in this country, 49M, launched by Eskom, the government and business partners. The deputy president of South Africa, the ministers of public enterprises and of energy, and business partners call on the 49-million South Africans to join the 49M movement to save power… (more)
Your enlightened readers may have felt a certain degree of satisfaction upon reading last month that Eskom completed its program of exchanging no fewer than eight million old-fashioned, inefficient electricity-guzzling incandescent light bulbs for the new super-efficient compact fluorescent light (CFL) type… (more)
This paper looks at energy savings potentials in utilities in industrial processes. It presents a monitoring and targeting strategy proposal that will assist in realising sustainable energy savings in key energy user utilities in processes… (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)
Merely changing a meter achieves nothing unless the new features the technology provides in some way change the ways that people and organisations use the product being metered. Stories are circulating in utility circles of companies that have invested in advanced meter infrastructure without seeing any justifiable benefits… (more)
There are numerous, well documented, incentives for consumers and energy suppliers to reduce electricity consumption. These range from a lack of generation capacity on the one hand, to high energy costs and detrimental environmental impacts on the other. Reducing energy consumption will not only reduce the overall demand on the grid during peak periods but will also reduce the base load generation requirement… (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)
Motors generally consume up to 60% of the total energy bill, so a good way to begin any energy cost savings programme is to pay close attention to induction motor control. The applications in which energy savings can be achieved include pumps, fans, compressors, hoisting systems and conveyors with high duty cycles… (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)
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)
A feasibility study was conducted at the waste water facility to determine the potential for energy efficiency through aerator control. The basin was monitored and it was found that there was no control; all the aerators were operating all the time and the sewage was over-aerated. The aerators were controlled to determine how many were necessary to ensure sufficient aeration, and it was found that the dissolved oxygen (DO)-levels could quickly swing between too much aeration and too little aeration. This indicated that real-time access to DO-levels was crucial for aerator control.Based on the findings it was expected that electricity consumption could be reduced by about 38%… (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. This suggests that such motors are either grossly oversized or are cycling with significant time spent near no-load or idling duty… (more)
Data center electrical efficiency is rarely planned or managed. The unfortunate result is that most data centers waste substantial amounts of electricity. Today it is both possible and prudent to plan, measure, and improve data center efficiency. In addition to reducing electrical consumption, efficiency improvements can gain users higher IT power densities and the ability to install more IT equipment in a given installation. This paper explains how data center efficiency can be measured, evaluated, and modeled, including a comparison of the benefits of periodic assessment vs. continuous monitoring… (more)
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