Building Performance Case Study
“I was impressed with Demand Logic's capabilities from the word go; the IT dashboard is very user friendly and, since the system was installed four months ago, our on site engineer Daryl has been able to easily identify and resolve anomalies far beyond the capabilities of the current BMS software. This has already resulted in a more efficient HVAC plant system, both in terms of cost efficiency and energy consumption, in addition to improving overall comfort levels on the tenanted floors.“
- Emma Swan, Facilities Manager, JLL
Installing Demand Logic at 60 Queen Victoria Street
JLL manage 60 Queen Victoria Street (60QVS) on behalf of RREEF, a Deutsche Asset Management fund. It is a 10 floor, 10,777m2 multi-tenanted office located in the City of London. The Demand Logic Data Acquisition Device (DAD) was installed in 30 minutes in February 2017. By the end of that day all of the HVAC equipment on the Building Management System (BMS) network was visible to Demand Logic and performance data was being recorded. Within the first week several energy saving opportunities were found, highlighted and communicated to the on-site team, all through the Demand Logic website.
Approximately 60% of the actions identified in the first 4 months have been completed by the JLL-Integral team. This has saved the site approximately £17,000 in energy, which covers the cost of the Demand Logic service. These savings did not involve any CAPEX spend, and did involve making positive changes to the BMS software. In addition to the energy, these operational changes also avoided a shortening of the lifespan of the equipment from 15 years to 7 years, thus avoiding additional lifecycle costs. There are further changes planned to the building control strategy which will significantly reduce the heating and cooling energy demand.
Reducing out of hours operation
The Figure 1 below shows, on the left, out of hours operation identified by Alan, a Demand Logic Account Manager. In this case, an action was raised based on automatic analysis showing several AHU fans operating out of hours - shown in red. The action was assigned to, Daryl, the building Supervisor, and it was tracked in Demand Logic through to completion. The view on the right shows the improved operating hours after the changes were made - now mostly green. Actions are kept as an electronic log of changes made to the operation of the building and the savings accumulated.
Figure 1 - Major Plant (AHU) Watchdog
In addition to the AHUs, Demand Logic was also used by Daryl to identify out of hours operation of an additional piece of major plant - a chiller - and the time clock was corrected to save energy. The figure below shows how this Action was captured on the website, and this becomes part of the log.
Improved comfort control
Demand Logic monitors all of the HVAC equipment and sensors on each floor as well as the main plant. This provides a rich picture of internal comfort conditions (i.e. temperature, humidity, air quality and improves the ability of the site supervisor to provide a high quality service to tenants. At 60QVS, the Supervisor used Demand Logic to identify, and then add, software missing from the BMS which means that FCUs on the 3rd floor was invisible and could not be controlled effectively. Other FCUs have been found to be disabled and are now reconnected to the BMS, improving comfort control.
Further changes are now planned to improve the maintenance programme and control strategy of the 336 FCUs which will improve comfort conditions for tenants and reduce energy consumption. Demand Logic’s experience at other properties, like the Walkie Talkie, has shown this can deliver a reduction in heating and cooling demand of 25%-40% by making similar changes on tenant floors.
