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The effectiveness and advantages of an energy-efficient concrete mixer drive using a synchronous permanent magnet motor to develop helical rotor movement… (more)

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

Sustainable energy management in South Africa does not require expensive interventions for it to succeed. Starting with a foundation of basic principles can deliver sustained savings, providing a platform for optimal utilisation of renewable energy. Local citizens and businesses need to prioritise reducing their current electricity consumption in order to mitigate the risk of running out of this scarce commodity… (more)

A simulation model was used to simulate and ascertain the electrical energy savings potential of a variable flow strategy on a mine cooling system. This strategy will be achieved by installing variable speed drives (VSDs) on the bulk air cooler (BAC) and refrigeration plant pumps… (more)

Electric motors are used either in constant or variable torque applications. The use of VSDs on electric motors can have negative effects on motors’ life, depending on the application and cause harmonics, voltage spikes and operating temperature increases… (more)

The technical and control philosophy challenges faced in the automation of a water transfer pumping station… (more)

Power Alert is a residential load management tool that is unique to South Africa. It is extremely successful in creating measurable demand reductions, and has been awarded various national and international awards… (more)

The Department of Water Affairs (DWA), is responsible for the sustainable supply of useable water in South Africa. This water is not only used for residential and agricultural purposes but also to provide water for industrial processes, the mining industries and cooling water for power stations. South Africa is divided into 19 water catchment areas. This case study focuses on the Usutu-Vaal government water scheme (GWS). In Mpumalanga close to Standerton, which supplies water to Sasol and four power stations – Tutuka, Matla, Kriel and Duvha. Water is also transferred from Matla to Kendal power station… (more)

A step-by-step sequence of events in a typical Eskom-funded DSM project and a closer look at the problems that prevent more ESCOs from participating in industrial DSM projects… (more)

Cement manufacturing is an energy-intensive  process where electricity costs account for up to15% of  the total manufacturing costs. The increasing electricity  tariffs in South Africa make it imperative for cement producers to implement or become involved in DSM  initiatives in order to remain competitive. In this paper,  a case study of a load shifting project that was  implemented at a typical South African cement plant is  presented… (more)

Being a lecturer, teaching control courses to both mechanical and electrical/electronic engineering students, I increasingly become aware of students struggling to get their minds around these two concepts. This may be due to the fact that control systems is a kind of ethereal technology – since despite its wide spread application in industry, it is mostly invisible. Putting it differently, control systems may be viewed as a key driver in modern technological advances, only becoming visible if it failed in some way… (more)

A low-cost automation system to minimise energy consumption of circulation pumps and to regulate the chemical composition of the water in swimming pools… (more)

Controlling water flow to underground mining sections reduces the amount of water required to be pumped back to the surface, resulting in significant energy savings. Water flow and pressure can be controlled by installing control valves at strategic positions throughout the water reticulation system. Valve selection or specification requires that several constraints be satisfied to ensure an effective solution… (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)

The effect of source stabilisation on the energy consumption and harmonic distortion of a single-phase induction motor-pump configuration for a swimming pool in South Africa. In this project, a single-phase induction motor pump was used to circulate water in a swimming pool. The pump is supplied with a single-phase voltage source with external noise, causing the efficiency of the induction motor pump to be lower than required… (more)

Demand side management (DSM) initially focused on reducing the Eskom evening peak, but the electricity demand profile, although reduced during peak periods, has broadened in recent years. The utility also has a problem with base load supply between the morning and evening peaks. Load shifting is therefore still necessary, but Eskom now requires the load to be shifted to night time periods when electricity demand is lower… (more)

Most mining operations in South Africa rely on compressed-air systems to facilitate production. Many opportunities exist to reduce the electrical energy consumption of these compressed-air systems. The electrical energy consumption of compressed air systems can be reduced by reducing the demand for compressed air… (more)

The location of settlements has an important bearing on the effectiveness and feasibility of supply of municipal services. The use of GIS (geographical information systems) could assist in planning for a location that will support service provision and human safety… (more)

An efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill. In this study, two scenarios were evaluated: where the induction motor was controlled at a constant speed with a variable thickness slab, and where the speed of the induction motor was controlled according to the thickness of the slab… (more)

The 2011 SAIEE National Student Project Competition was held in the new Engineering Building at the Potchefstroom Campus of the North-West University in November 2011… (more)

Each year in South Africa, thousands of hectares of agricultural land, livestock, farming equipment, houses and lives are lost due to raging veld fires. During August 2011  the North-West Province experienced significant veld fires and on 23 August 2011, intense veld fires ravaged the areas around Fochville, Potchefstroom, Carletonville, Boskop, Amalia and Ventersdorp. At one time 13 veld fires were burning, which quickly depleted the response capabilities of the role-players. The damage caused and losses sustained quickly exceeded the resources of the local authorities and affected communities… (more)

EE Publishers is pleased to announce that, for the third consecutive year, it will be sponsoring the prize money of R25 000 for the 2011 SAIEE National Student Project Competition organised by the South African Institute of Electrical Engineers and hosted by the School of Electrical, Electronic and Computer Engineering, North-West University, Potchefstroom Campus… (more)

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