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FEATURE HVAC


Energy savings for Exchange Plaza


Exchange Plaza is a prestigious landmark office building located on Lothian Road in the heart of Edinburgh’s financial district. This 100,000 square foot, modern, six-storey building is home to large companies that include oil and gas explorer Cairn Energy, law firm Burness Paull, the All Bar One restaurant and bar group, and award-winning craft beer producer, BrewDog


R


ecently, ECG, the company responsible for managing Exchange Plaza, decided


to look for ways to reduce the energy used by 16 pumps in the building’s HVAC (heating, ventilation and air conditioning) systems. Having approached Pump Action to carry out the pump assessment, Pump Action contacted Greenville, a premium Danfoss Drives partner. Steven Brown, business development


manager at Greenville, working in conjunction with Pump Action, assessed the condition of the existing pump systems and provided a report on their efficiency, as well as to suggest improvements. “Working with Pump Action, we


produced energy saving calculations and concluded that the building and its inhabitants would be much better served by the installation of new pumps and new AC Drives,” says Brown. “The existing installation had old, inefficient pumps with either DOL or star/delta starters and so they could only run at full speed. Our proposal was to install new efficient pumps along with variable speed drives (VSDs) so that the pump speed could be regulated to match demand. ECG accepted our joint proposal, so we supplied the VSDs to


Pump Action, who installed them alongside new pumps.” “We were asked by ECG to look at


upgrading the pump equipment which was 25 to 30 years old,” explained Colin Ramsay of Pump Action. “We selected modern high efficiency pumps to complement the new Danfoss drives. The whole refurbishment process took two weeks to complete and there was no disruption to the tenants’ activities.” The VSDs installed at Exchange Plaza’s


HVAC system are Danfoss VLT FC102 HVAC types. These drives provide optimised process control in HVAC applications. Easy to use and to install, they feature a wide range of functions specifically developed for use with pumps, fans and compressors to save energy, meet environmental regulations and reduce costs in modern buildings. The drives feature compact construction


and are available with power ratings from 1.1kW up to 1.4MW. They are an excellent investment with a short payback time in upgrade and refurbishment applications, especially as a wide range of control, I/O and communication options are provided as standard. The new drives at Exchange Plaza have been configured to suit each pump in the


system using the AEO (automatic energy optimiser) within the drive functions, which typically reduces running costs by five per cent to 15 per cent, compared with drives that do not have AEO. Automatic motor adaption (AMA) was also performed on the drives at commissioning stage, ensuring the drives and motors are optimally matched. Among other things, AMA takes into account cable inductance and motor winding resistance to fine tune the drive for each individual motor, thereby maximising overall efficiency. An independent energy report from


consultants Hulley & Kirkwood, carried out after the installation of the new pumps and drives, found that energy consumption was reduced by £3,500 per annum, from a figure of £11,162 before the upgrade work was carried out. This is an impressive saving of 31.7 per cent. Andrew Wilson, the ECG manager who


was involved in the project from the very beginning, says, “We look after the Exchange Plaza building and it is our job to keep costs down while ensuring that the tenants continue to enjoy maximum comfort. Greenville has helped us on a number of occasions and now it was instrumental in supporting Pump Action’s installation on our site. We are very pleased with the results and so are the tenants. Danfoss drives are helping us to operate more efficient and cost-effective systems that are also in line with our environmental policies.”


Danfoss Drives 18 WINTER 2019 | ENERGY MANAGEMENT danfoss.com 


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