||Chicago Center for Green Technology
This is a gut rehab’ of a 1940s office building that was originally
designed for natural ventilation with long narrow wings for cross ventilation.
In the 2003 renovation, a ground-source heat pump provides all space cooling
and most of the space heating. There are no integrated controls between
the operable windows and the mechanical system, and occupants are free
to open/close the windows at their own discretion.
||Carnegie Institute for Global Ecology
Offices and research laboratories are conditioned with a combination of
radiant slab heating & cooling, an evaporative cool tower, natural
ventilation, and mechanical ventilation in the lab spaces. Chilled water
is created from a night sky roof spray system. There are no integrated
controls between the operable windows and the mechanical system, and
occupants are free to open/close the windows at their own discretion.
||Chesapeake Bay Foundation
This two-story open-plan office building includes low-level windows
that can be operated by the occupants, and upper clerestory windows that
automatically open. Outdoor temperature
and humidity sensors determine when the climate is appropriate for natural
ventilation, where upon the mechanical system is shut down, red/green
lights notify the occupants they can open windows, and mechanical actuators
open the clerestory windows to induce a draft.
This building combines private perimeter offices with an open plan in the
core. It used an evaporative cooling chiller in concert with an ice storage
system to minimize energy costs during the peak demand periods of summer
days. When sensors indicate the building should switch to natural ventilation
mode, the cooling system shuts down, the clerestory windows are mechanically
opened, and lights in the corridor change from red to green to tell occupants
they can open the lower windows.
||Natural Resources Defense Council
Situated in a warm/temperate climate, this building uses relatively little
mechanical cooling. The displacement ventilation system is designed to
provide cool air only where it is needed. The building has a real-time
display that shows occupants about
how much energy is being used (and generated by the PV) and where. Occupants can use the operable windows
and clerestories at their discretion, with no controls connecting
their use to the mechanical system.
||Woods Hole Research Center
A website shows real-time energy data and
system performance to provide ongoing education to the
building occupants and the public. Heating and cooling is provided using
a ground source heat pump powered by solar panels, and the hydronic system
either feeds water-to-air heat exchangers in the large common areas,
or individually-controlled valence convectors in the offices. There are
no controls between the mechanical system and windows, and occupants
are free to open/close the windows at their own discretion.
The four-story office wing, and three of the four floors in the laboratory
wing were initially designed to be exclusively naturally ventilated.
Air-conditioning was added to the laboratories and core offices by tying
into the campus multi-building chilled water loop, supplemented by the
building’s own chiller. The operable windows and transoms have sensors on the window frames that
turn off the heating system when the windows are open.
||Gap Office Building – 901
Utilizing an underfloor air distribution system, occupants have control
not only of the operable windows, but also the floor diffusers. Lower windows combined with upper clerestories
and louvers in the central atria help promote stack ventilation. These high level vents remove heat gains from
lights, equipment and occupants. The
building also utilizes nighttime pre-cooling strategy. Occupants can use the operable
windows at their discretion, and there are no controls
connecting their use to the mechanical system.