Three steps for reducing total cost of ownership in pumping systems

  Electrical energy cost represents some 40% of the total cost of ownership of pumping systems, yet many organisations fail to introduce the proper steps to leverage cost reduction through efficiency improvements. The following major barriers must be recognised and addressed to solve this dilemma: Lack of proper metrics: Energy efficiency has traditionally not been […]

The top six places to look for energy losses in buildings

  A typical thermal imager’s scan of a building can show energy saving opportunities of up to 15% with varying degrees of repair investments required. Unlike regular digital cameras, thermal imagers create pictures by detecting infrared energy or heat. The thermal imager then assigns colours based on the temperature differences it detects. With a small […]

Farewell to the incandescent lamp

  This article discusses the place of the incandescent lamp in the lighting industry over the years and explains in some detail three alternatives to this technology offered by the lighting industry. A lot has been written about the invention of the incandescent lamp. The first attempts at creating light using incandescent technology were made […]

The challenges of dimming LED loads with magnetic transformers

  The technical difficulties with dimming low-voltage LED lamps on magnetic transformers and some design tips to improve the situation and avoid problems. Anyone who has used LED loads with low-voltage magnetic or electronic transformers in dimming applications has likely experienced confusion, frustration or disappointment. Some blame the dimmer as the cause of the problem, […]

Circuit breaker design for safety in underground mining applications

  Circuit breaker applications in underground mining and recommended methods to maximise the effectiveness of these protective devices In mining, the underground assembly or power centre is engineered to transform and distribute electrical power brought underground. This assembly typically includes a medium-voltage incoming circuit breaker or switch with current-limiting fuse (see Fig 1). The device […]

How recommissioning saves energy in buildings

  This article reviews how recommissioning of buildings can result in energy savings of 5 to 15% with a typical payback of under two years. In today’s business environment, buildings change on an ongoing basis: employees are added or moved; new departments are formed and old ones dissolved. Over time, entire sections or floors may […]

Selection of AC induction motors for cement plant applications

The selection of AC induction motors for cement mill applications, with reference to fan, kiln and vertical mill applications. Cement plant applications present an immense matrix of application criteria to specify, design and build motors properly. Operating conditions Basic motor specifications begin with determining the motor nameplate horsepower (hp) and revolutions per minute (rpm). These […]

Water treatment: boilers, cooling and effluent

  From the ICMEESA archive Effluent treatment is based on the ingenuity of chemists and engineers. The chemist may devise a short-cut method for the precipitation of the components but the electrical engineer designs the controls while the mechanical engineer design filters, conveyers, agitators and others. The methods employed in effluent treatment can often be […]

Designing an augmented reality platform in an enabled environment

  Developing an augmented reality platform for use as a differential drive mobility aid in an enabled environment to help conduct simulations with various wheelchair constructs and to produce pitch and roll actuated actions. Physical or cognitive impairment may compromise the ability to walk. The degree of mobility largely determines the extent to which the […]