The Tobey Building in Concord NH was originally built in the 1920s it is currently a State owned building. The State of New Hampshire hired Lavallee Brensinger to re-design and renovate the facility. The renovation of this building will allow the Department of Public Works to consolidate its operations into one facility to house its administrative functions that currently operates out of four different locations as the building consists of approximately 75,000 ft.² and will have a two level, 300 space parking garage.
The Tobey Building is now considered to be start of the art in terms of how its HVAC, (Heating, Ventilation and Air Conditioning) are produced for the building. It utilizes some of the most green of technology along with condensing high efficiency gas Boilers. Utilizing a very unique form of cooling known as “off peak ice storage production”. This system basically utilizes chillers to make ice stored in underground tanks at night when electricity during most months is substantially less in cost and yields substantial energy savings in terms of HVAC costs. During the day when most chillers systems for buildings of this size are working hard during peak demand times, the Tobey Building chillers are off on stand-by and the cooling for the building is provided by a recirculating a water loop that is integrated into the underground ice tanks whereby this “cold” or “chilled water” is then pumped to a heat exchanger and then throughout the building’s cooling system to provide the cooling during these day time periods from the ice storage tanks at substantially less cost.
This is a pure example of green technology especially on the basis that much of the electricity that is utilized at night by this form of HVAC ice production would be wasted due to the fact that the power plants that serve NH are not able to substantially reduce production and still be ready for peak demand the following morning. Therefore many power plants produce power at near full peak levels all night long with this power being wasted where it is sometimes emitted to the ground.