Carrier brings new levels of energy-savings through an innovative solution based on converting fixed speed centrifugal chillers to variable speed units.
Customer: Citi, Banking and Finance
Location: London, UK
Equipment running since: July 2012
In their efforts to help customers manage energy consumption and operational costs, Carrier engineers added Greenspeed® intelligence for Variable Speed Drive (VSD) functionality to two Carrier AquaEdge™ 19XR5 centrifugal chillers serving Citi’s UK headquarters at Canary Wharf, London. Power use was monitored before and after deployment of Greenspeed® intelligence, demonstrating substantial reductions in energy consumption, and proving the case for such VSD retrofits.
The Citi retrofit project was carried out in two stages. Stage one involved installing Greenspeed® intelligence on the first centrifugal chiller. To help the customer quantify the benefit in terms of lower energy consumption and reduced running costs, Carrier monitored energy use before and after installation using Carrier’s IVU system. The tracking showed substantial energy savings as a result of the use of variable speed drives, encouraging Citi to request the installation of a second centrifugal chiller with Greenspeed® intelligence.
Following completion of stage two, Carrier monitored actual performance data for the two chillers with Greenspeed® intelligence, and compared the data with previous energy consumption figures prior to retrofitting. The results enabled savings of £33,966 for the first three months of 2013, in line with projections and proving the case for the retrofit of variable speed drives.
The solution addressed a number of specific challenges:
Carrier’s ability to upgrade chiller performance with the addition of custom-designed variable speed drive function offers customers the ability to reduce their cooling energy costs, cut carbon emissions and extend the operational life of their plant.
As a result of the success of the project, Carrier has secured subsequent orders for several Greenspeed® intelligence retrofit projects on centrifugal chillers serving multi-storey commercial buildings in London and elsewhere in the UK. Clients include well known global names in banking and finance.