Holden House W1, a mixed-use property on Oxford Street in central London, has been a landmark since its construction in the 1920s. The building features retail spaces on the lower floors and offices above. It underwent a significant upgrade to its main chilled water plant to improve efficiency and reliability.
NDY handled the upgrade scheme, which involved installing a dual compressor air cooled chiller, providing high seasonal efficiency, greater turndown and redundancy. To save space and improve maintenance access, onboard twin head primary pumps were incorporated into the chiller frame. During the chilled plant replacement, we designed a temporary cooling system to minimise tenant discomfort, along with several prefabricated elements to reduce onsite installation time.
To improve water quality and system efficiency, side stream filtration, dirt/air separators and strainers were incorporated. Detailed heat modelling revealed a reduced cooling demand due to tenant variable refrigerant flow (VRF) installations, allowing for a smaller, more efficient chilled water plant.
Validations ensured the retention of existing electrical infrastructure and ancillary plant, saving costs and reducing downtime. The addition of metering and local digital controls further improved energy management and fault monitoring.
The Holden House upgrade transforms the building into a more efficient and reliable space, creating a comfortable and enjoyable environment for everyone who works and shops there.
