Copyright © 2016, Hurtwood Ltd
The Scope of the Project
100 Temple Street was acquired by Bristol City Council in 2012. The building services were controlled by an obsolete Staefa AS1000 Building Management System (BMS). The option to undertake a complete upgrade to a new Siemens system was considered, but Hurtwood advised a much more cost-effective retro-fit solution which still delivered the new Siemens control and user interface.
BCC’s own subcontractors installed the solution in a matter of weeks, with a significantly reduced down-time for the BMS. In the process, a whole host of legacy opportunities were seized, including heating the domestic hot water supply from the boiler plant rather than from immersion heaters. Also, the use of a Modbus based system meant that other items of plant have been cost-effectively integrated into the BMS, for example, the energy consumption of one AHU was reduced by 80%. The retrofit system freed up valuable engineering time to get to grips with the services rather than focussing on the tactical effort of upgrading the whole BMS.
Heating & Ventilation services are far more efficiently controlled and are significantly optimised, reducing staff complaints. This has led to demonstrable cost and efficiency savings of about 20% across the building. For instance, the chillers rarely run during the day because the chilled water thermstore is being charged during the night, using cheaper electricity.
BCC now have a future-proof solution and they are very happy with the efficiency savings that have resulted. The retrofit solution that Hurtwood implemented has helped them to meet their own targets for energy efficiency and sustainability, and demonstrate to their stakeholders – including the council tax payers of Bristol – that they are making decisions that affect the future of Bristol and beyond.