Save Energy With Variable Speed Drives

9th April 2013 | Posted by Charlotte Miskell

Variable speed drives were first developed with the sole purpose of process control in mind, but over time saving energy has proved to be an equally important quality. VSDs are used to regulate electrical motors by changing the electrical supply frequency, thus saving energy.

Variable speed drives can save you thousands, tens of thousands even, of pounds each year. This amazing feat is made possible because the VSD can cut your energy consumption by upwards of 60%. For this reason adjustable speed drives are the superior option, besting fixed-speed operated loads, centrifugal fan and pump loads with consummate ease. By using an adjustable speed drive in new or retrofitted applications you’ll save an abundance of energy. One example is excessive airflow, which can be successfully regulated with an adjustable speed drive controlling the speed of your fan motor, saving you more energy than you would if you were to directly regulate the airflow with a damper. You can drop your power consumption to about 12.5% of full power by reducing the fan speed to 50% of full speed according to the affinity laws.

Saving Money With Variable Speed Drives

energy saving variable speed drives

It’s said of variable speed drives that they’ve already been responsible for well over £100 million in energy savings. A favoured choice because they, 1) Actually work and, 2) There’s no simpler way to control your pump and match it to the pump system than with a Variable Speed Drive. You’ll see immediate improvement when you replace your throttled centrifugal load or fixed speed damped with one of our variable speed drives. The efficiency of variable speed drives is truly astounding. By reducing the speed of the pump the pressure and flow are also reduced, and the results are amazing. Reducing flow by 30% can see a 60% energy reduction!

13% of all electrical energy consumed in the UK is attributed to pumping systems. It’s been admitted that with improved operation and design of pumping systems there’s a very real potential to save on an abundance of carbon emissions each year – well over a million tons, to be a little more specific. Knowing this, the government has set the target of getting consumption down by 6 TWh/a [Tera is 10 to the power 12] before 2020. That’s where variable speed drives come into the picture.

VSDs are the way forward in saving energy from pumping systems by regulating the flow. In the past many tried to control systems by throttling and balancing valves. Sadly, it’s a waste of time and energy as the method is decidedly inefficient. Throttling might well limit the flow but as the motor still runs at its maximum speed and has to go against a restriction, it’s proved to be a fool’s errand. A variable speed drive on the other hand reduces the motor speed ensuring that no extra energy than is required is used to control the flow. Variable speed drives can be fitted to existing motors without the need to make adjustments to the system pipe work.

At Proplas International we have a great collection of AC Drives that we can supply, install and commission.

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