Roche Products UK operates from a 21,200m2 office, meeting and conference facility in Welwyn Garden City, Hertfordshire. The site consists of two buildings which were constructed in 2005 and are fully air conditioned using a combination of ducted fresh air and local chilled beams. The main building is served by a combination of ammonia refrigeration for chilled water and condensing boilers for LTHW heating.

An ALC control system operates the buildings mechanical systems and a Delmatic lighting control system provides main switching of the lighting, supplemented by local switches in meeting rooms and PIR's for out of hours working. The smaller building was originally designed for patient trials and has a total loss ventilation system with no heat recovery.

The buildings are not being utilised as originally designed which provides a number of challenges for the building manager to maintain comfortable conditions. The buildings are over 10 years old and many of the mechanical systems are now approaching the end of their design life, so Roche were keen to use ESOS as a stepping stone to both reduce energy usage and review the systems against present building use.

Electrical Profile—Friday, indicating high base load overnight and weekends

ESOS Energy Audit

The detailed ESOS survey identified a saving of £74,000/year (16%) for a capital investment of £44,500 providing a fast payback in 7 months.

The majority of the savings were achieved through operational change, resetting of BEMS and lighting controls to match the core occupation hours of the building. The controls are already in place and this enables the rapid payback and this reflects the savings that can typically be achieved through reviewing BEMS controls in complex buildings. The reduction in plant operating will significantly reduce electrical loads out-of-hours to deliver immediate savings.

Key projects to deliver savings include the control of ventilation against Carbon Dioxide levels to match occupation, automatic lighting switching to take advantage of good natural light and maximising the use of natural ventilation to reduce fan motive power.

Client Comment

“ESOS has shown us considerable financial savings that will contribute to our drive for sustainable business”.

Joanne Jones (PIEMA), Safety, Health & Environment (SHE) Co-Ordinator

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