Posted to News on 6th Feb 2007, 11:28
Soft starters can cut energy consuption by 18%
Reducing energy costs and corporate carbon emissions in the food industry can be accomplished easily and cost-effectively by using Fairford's SPOSS single-phase power-optimising soft starter. Simply by fitting SPOSS soft starters (in about 15 minutes) to the electric motors used on refrigerators, freezers, chillers, and compressors, energy demand can reduce immediately by 10-18 per cent per unit: these figures are backed-up in an independent report by EA Technology Ltd.
SPOSS is an excellent product for addressing the issues being investigated by a multi-disciplinary project that is being undertaken as part of the Carbon Vision research programme - one of the biggest projects ever undertaken into the understanding of how to achieve changes in carbon emissions. The project is focused, in particular, on food industries where low-temperature cycles are common. Since refrigeration or chilling systems are a major energy consumer in food industries, the potential for energy saving is considerable.
In the UK, two-thirds of all electricity used by industry is consumed by electric motors - and many of these are used in refrigerators, freezers, chillers and compressors. By reducing the energy consumed by this equipment, money is saved and a measurable reduction in carbon footprint is achieved (generating source carbon emissions are reduced by 430g for every kW-hour saved). These savings are rapidly achieved using a Fairford SPOSS unit, as evidenced by an independent report by EA Technology Ltd on the effect of fitting just one freezer with an optimising soft starter.
The Fairford SPOSS device performed well, demonstrating that similar freezer temperatures were maintained when the device was installed, and that savings of between 10 and 18 per cent were obtained...
The automatic energy optimising technology that enables SPOSS to provide these savings is Fairford's own, and is based the well-known Fairford System Patent. With optimising selected, the SPOSS soft starter continuously adjusts the motor terminal voltage so that the input energy corresponds to the mechanical output required. This reduces wasted power, improves motor power factor, improves efficiency and reduces motor heating. These results are particularly beneficial in applications such as refrigerators and air compressors, which run at varying loads for extended periods of time.
In addition, refrigeration systems that employ hermetic or semi-hermetic compressors enjoy an additional benefit from the reduction in motor heating. Because the motor runs colder, the cooling medium - in this case the refrigerant gas - does not become as hot after it has passed over the motor windings, enabling the compressor to run for shorter periods, giving additional savings. This benefit can be significant in applications such as beer coolers, supermarket refrigerated display cabinets, chillers, bakery oven fans and conveyors.
As a complement to its energy saving benefits, the SPOSS soft starter reduces or eliminates mechanical and electrical stresses on motor start-ups (hence 'soft starter'). This feature protects refrigerator compressors from damage every time they switch on or off. As a result, businesses suffer fewer stoppages, which means less downtime and reduced operating costs.
* EA Technology is one of Europe's leading consultancies for impartial engineering reliability and failure investigation. www.era.co.uk
