A successful Partnership that delivers outstanding results
The John Lewis Partnership have set stringent energy and carbon targets for their business. The Partnership is working to reduce absolute operational CO2e emissions by 15 per cent by 2020/21 against the 2010/11 baseline.
As a business, the Partnership's shops and branches are focussed on the overall customer experience. Energy management initiatives have always placed this, and partners' engagement, as the key foundation of the Partnership's sustainability strategy.
Following the successful implementation of remote energy monitoring and alarming of plant in thirty John Lewis branches which delivered electrical savings of 11% and carbon savings of 12.3%, John Lewis Bluewater (a 200,000 sq ft store) was identified as a candidate for a BeMS upgrade that would enable the full benefit of an energy engineered solution to be realised.
Challenges & Actions
The European Standard EN 15232 (“Energy Performance of Buildings – Impact of Building Automation, Controls and Building Management”) was compiled in conjunction with the Europe-wide implementation of the directive for energy efficiency in buildings (Energy Performance of Buildings Directive EPBD) 2002/91/EG. The standard describes methods for evaluating the influence of building automation and technical building management on the energy consumption of buildings.
Prior to the replacement of the BAS 2800+ system originally installed in 1999, a review was carried out of the control strategy and the installed control components by Next Control Systems Limited and these results were used in a BS 15232 analysis and prediction tool developed by Siemens Building Technologies.
A ‘like for like box replacement’ would have delivered the benefit of an upgraded asset and reduced maintenance risk and costs to the Partnership but shifting the control strategies towards a ‘demand led’ regime would substantially reduce the operational costs, especially with regard to the energy consumed.
Based on the revised BeMS design and control strategies, the BS 15232 tool predicted that the individual performance classes achieved would be improved to :
The project was given the green light based on the projected savings as modelled by Lateral Technologies & Solutions Limited and Next Control Systems Limited commenced the upgrade of the controllers to Trend IQ3s and installation of additional field components in February 2013. The project was completed by May 2013 without impacting the stores ability to trade or the customer experience that is the cornerstone of the Partnership.
Lessons & Results
Lateral Technologies & Solutions Limited were responsible for validating that the projected savings were achieved via consumption data from the main fiscal meters and supported by the various sub meters installed by Next Control Systems Limited as part of the project.
After twelve months of operation, the actual reduction in consumption is as follows ;
- Gas reduced by 928,228 kWh per annum (within 8% of forecast of BS 15232 tool)
- Electricity reduced by 1,658,143 kWh per annum (within 4% of forecast of BS 15232 tool)
The simple payback on the project has been 16 months.
Ian Gibb, Chairman, Lateral Technologies & Solutions Ltd said
To achieve the desired carbon reduction targets it was essential that the full team were proactive in their approach. Next Control Systems Limited exceeded our expectations to deliver this project working closely with the client and ourselves throughout.”
The John Lewis Partnership store at Bluewater is directly connected to the Next Control Systems remote response centre which enables our suite of tools to profile the operational and energy performance of the store and report on any deviations from this profile in real time.
This ensures that the store performance remains aligned to the Partnership estate standards with all local manual interventions (overrides, set point changes etc) being automatically identified
Operational and energy alarms are automatically directed to the store manager for action and are logged for compliance records.
The above processes ensures that the store avoids performance drift and remains as operationally and energy efficient as possible.