Energy consumption reduced by 54%

at the Western General Hospital

PROJECT REFERENCE

FACTS

Customer: Need: Fan replacement and upgrade Solution: Replace with bespoke design fans with inverter drives

Fläkt Woods has recently replaced 6 ‘J’ fans originally manufactured by Woods of Colchester in 1967 at the Western General Hospital, Edinburgh. Once completed the energy usage has been calculated to have been reduced by 54%. Giving a payback of just 1 Year, 3 Months.

Above: Original Fans Installed in 1967. Below: New Fans Installed in 2013

The annual savings are calculated at over £143,500.00

Fläkt Woods Group Fläkt Woods is a global company providing solutions for ventilation and air treatment for buildings as well as fan solutions for Industry and Infrastructure applica-tions. By combining their dedi-cated range of Chilled Beams, Air Handing Units and Air Cooled Chillers, Fläkt Woods has been able to produce some of the most efficient and green indoor air quality (IAQ) solutions currently available within the Building Services Industry. Contact information Tim Hewes tim.hewes@flaktwoods.com Fläkt Woods Ltd UK www.flaktwoods.com

Fläkt Woods Limited

Axial Way, Colchester, Essex. CO4 5ZD, UK

t +44 (0)1206 222547

© Copyright 2011 Fläkt Woods Group

Due to a policy of continuous development and improvement the right is reserved to supply products which may differ from those illustrated and described in this publication. Certified dimensions will be supplied on request on receipt of order.

Replacing two pairs of three stage fans at Western General Hospital in Edinburgh with bespoke JM axial fans and inverter drives will achieve a payback of less than two years through reduced running costs. The original fans ran constantly at an estimated motor efficiency of 76%, whereas the new motors are over 93% efficient and have variable duty. The fans supply fresh air to the outpatients department. To minimise installation time and costs, the fans were specifically designed to match the dimensions and mounting of the original units. Paul Cairns, head of estates at NHS Lothian, said ‘Based on this installation, we’re now also looking to fit new extract units from Flakt Woods throughout the building.’ Fläkt Woods brief was to replace the original fans. The existing units had reached the end of their serviceable life and Fläkt Woods were invited to offer their expertise on the units given that they supplied the originals back in 1967. Fläkt Woods identified a way to save energy by utilising high efficiency motors, then controlling duty by using frequency Inverter drives. In this case, by opting to use a specialist HVAC range of drives to best match the fans and the existing control systems. As Tim Hewes, Service Sales Engineer for Fläkt Woods explains “the customer needed to do something with the fans as they had started to fail on a regular basis. Due to the access constraints and presence of Asbestos it was important that the new fans would be a direct replacement. We completed a turn-key package of works from design and stripping out to commissioning, including updating the electrical supplies to current standards”

The project was designed to improve the reliability and running costs of the existing installation. Recommendations were made for energy savings by utilising high efficiency motors coupled to inverter drives.

Above – New fans arrive on site Far left/left – Original soft starters and capacitors are replaced with new HVAC drives.