True cost savings come when the projects are considered as one integrated package
a LEED platinum model office space in the building to show tenants what a low energy office could look like.
Use efficient technology Chiller retrofit The cooling load reduction projects above made it possible to reduce chiller capacity, and allowed refurbishment of the existing chillers and upgrade their controls and drives rather than install new units.
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In addition, existing R500 refrigerant will be removed and replaced with R134A.
VAV air handling units A new layout means the number of constant volume air handling units can be halved. Two variable air volume units will replace the four constant volume units over time. This minimises capital cost, while reducing maintenance costs and improving tenant comfort
by reduced noise and improved control.
Controls Demand control ventilation This project involved the installation of CO2 sensors to bring in appropriate quantities of outside air based on occupancy levels, reducing energy use and improving indoor air quality.
Balance of direct digital controls Existing control systems for
building systems are to be upgraded using Johnson Control’s Metasys solution.
Tenant energy management Tenants will be individually metered and encouraged to save energy, according to ESB. They will have access to online energy and benchmarking information, allowing them to compare their energy use with other tenants to find out if they are average, high or low performers.
November 2011 CIBSE Journal 33
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