New and existing HVAC applications offer proven energy saving opportunities of up to 50% in schools, hospitals, shopping centres, hotels and office buildings.  As an variable speed drive maker of long standing, IMO UK engineers have the edge in the application and design of variable speeds, and the Jaguar VXH series is a dedicated inverter for HVAC applications.

The VXH series offers functions and features designed to create the optimal environment for the people using the building whilst keeping the energy consumption in AHUs, water pumps, compressors, condensers, and others to a minimum.   Within the UK there are an estimated 10 million electric motors running fans and pumps of all sizes, and collectively they are the biggest users of electricity in industry and commerce.

The simplest way to explain how much energy can be saved is to use pump and fan applications as an example: firstly because there are so many of them, and secondly they have the greatest energy saving potential.  If you reduce the speed of a conveyor belt using a variable speed drive from 100% to 80%, then you save 20% of the energy. If you apply the same theory to a pump, you would actually be saving a massive 50% of the energy.

How is energy saved?

A conveyor belt is a constant torque (torque is twisting force) application. The torque requirement throughout the speed range is the same, constant. The current to produce torque is relatively constant and just the voltage and the power vary with the speed. This means 80% speed requires 80% power.

Fans and pumps on the other hand are variable torque applications, meaning the need for torque and current increases with the square of the speed. The voltage also varies in proportion to the speed, so power actually varies in proportion to the cube of the speed. So if we reduce the speed by a given percentage, the power reduces by the cube of the speed change. So 90% speed results in 90% x 90% x 90% = 73% power.

So even just an 11kW motor running 16hrs/5 days/50 weeks can typically cost £2900pa in electricity costs (based on 6p/kWh and 92% efficiency at full load). Just a 10% reduction can reduce energy costs by £700+ this equates to a typical payback in well under two years.

Go here for VXH HVAC brochure 

Go here for IMO variable speed drives from stock at discounted