The William and Flora Hewlett Foundation Building
General Information
Location Menlo Park, CA
Owner The William and Flora Hewlett Foundation
Architect B. H. Bocook, Architects, Inc.
Engineer   Critchfield Mechanical, Inc.
Completed   May 2002
Building Use   Commercial Office
Size   48,000 square feet
Stories   Two
Cost   Unknown
Occupancy   Unknown
Relevant codes   California Building Code
California Climate Zone   3
Mixed-Mode System
Mixed-Mode Strategy   The Hewlett Foundation building used a changeover system where the windows and mechanical cooling operate at different times. The operable windows are considered as part of the building mechanical system’s economizer cycle.
Natural Ventilation Details   At the occupied level, the building has crank-operated, casement type operable windows set adjacent to fixed vision glazing, and are provided in all exterior offices. A 12-inch maximum opening governor is installed on all the first floor operable windows for security. When the economizer cycle is initiated mechanical operators open awning windows in one panel of each of the three upper clerestory bays utilizing the stack effect to exhaust air from the building.
HVAC System Details   An underfloor air distribution system provides fresh conditioned air closer to the occupied level via manually operated floor diffusers, and then removes warm polluted air via return air and exhaust devices placed in the ceilings. An evaporative cooling chiller is used in concert with an ice storage system, creating ice during off-peak hours at night and using it to cool the building during the day, thus minimizing the need for energy during peak demand periods. Two air handlers located in the basement parking area provide ventilation through a raised floor system with an air highway. Heating is provided by a high efficiency boiler with heating coils in the exterior zones located in the raised floor. None of the systems use ozone-depleting chlorofluorocarbons.
Configuration & Control   The building management system is used to determine when the ventilation system should switch into natural ventilation (economizer) mode. The changeover occurs when sensors determine that the return air is warmer than the outside air and the outside air is between 50 and 78 degrees Fahrenheit. When this condition occurs, the cooling system shuts down, the clerestory windows are mechanically opened and small lights in the corridors change from red to green indicating to the occupants that it is acceptable to open windows. This form of “informational control” allows the building to balance the needs for comfort and energy efficiency.
Building Design Process
Time Line   2000-2002
Design Tools   The U.S. Green Building Council’s LEED Rating System was used in setting the goals for the project before the design began.
Energy Analysis   Carrier HAP modeling was used to determine the ice cooling needs by simulating a one week period in a typical summer.
Commissioning   Comprehensive building commissioning included design review, installation testing, and continuous measurement and verification of the overall system and individual devices. All of the building systems were meticulously tested upon installation and will be routinely monitored to ensure high performance over time. The commissioning process did not result in any major changes in the building’s ventilation design. The commissioning design review did identify the need to add an additional control sequence to the ice storage system to allow for simultaneous ice making and use in the event of the building being occupied on a warm evening.
Code Conflicts   There were no code conflicts with the mechanical and natural ventilation strategies. At the time of design review the owner did decide to add an additional ice storage unit to increase the capacity to cool the building as a precaution but this was not due to any code requirements.
Other Design Issues   The design team had some difficulty determining an appropriate release exhaust vent location for the building due to the sloped roof. Ultimately the mechanical exhausts were located next to the stair and elevator towers.
Building Performance
Outdoor Air/Noise   The building is located next to a heavily trafficked street but is set back far enough from it and buffered by vegetation to mitigate any noise or air quality concerns. Greater concern was actually based on the fear that the building itself could become a noise nuisance for the adjacent residential areas.
Occupant Satisfaction   The University of California Berkeley Center for the Built Environment administered a web-based Occupant Indoor Environmental Quality (IEQ) survey at the Center for Global Ecology. The survey addressed general building satisfaction, general workspace satisfaction, office layout, office furnishings, thermal comfort, air quality, lighting, acoustic quality and cleanliness and maintenance. Survey results are currently being analyzed and will be posted at a later date.
Actual Energy Data   In progress.
Additional Building Features
Sustainable Sites   • The site is in proximity to alternative transportation lines, the Stanford University campus, local community infrastructure, and bike and walking paths.
• Many existing trees, including several magnificent oaks, have been preserved.
• 60% of the site has been dedicated for open space.
• Site drainage and storm water control systems employ bio-swales, detention ponds, and filtration devices to limit disruption of natural water flows, increase on-site infiltration, and eliminate contaminants.
• Exterior lighting has been kept to a minimum in order to protect night sky visibility and animals’ nocturnal habitats, as well as lessen the impact on neighbors.
Water Efficiency   • Highly efficient irrigation equipment and drought-tolerant landscaping that features adapted and native vegetation combine to reduce water consumption by a projected 50% compared to similar, conventionally landscaped sites.
• Waterless urinals in the men’s restrooms.
• Small, efficient dishwashers in the staff cafes.
• It is estimated that the building consumes 15% less water compared to similar facilities.
Energy and Atmosphere   • Innovative systems include underfloor air distribution, evaporative chillers, and ice storage.
• Ample daylight reduces the use of energy for lighting and contributes to an open interior atmosphere.
• Spectrally selective window glazing.
• Motion sensors shut down unnecessary lights when rooms are unoccupied.
• Photovoltaic panels on the roof.
• Building exceeds the already stringent California Title 24 energy efficiency standards by an estimated 35%.
Materials and Resources   • Building materials consist of 64% percent recycled content.
• A third of the materials were manufactured within 500 miles of the site.
• More than 83%of all the wood-based products are certified.
• Building materials were further evaluated on the basis of performance, low embodied energy values, and their potential to be diverted from landfills at the end of their usable life.
• Nearly 70% of construction and demolition waste was diverted from landfill to recycling or salvaging operations.
• Convenient bins throughout the building facilitate recycling of paper, plastics, and other materials by staff and guests.
Indoor Environmental Quality   • Low-emitting materials including carpet, paint, composite woods, adhesives, and sealants, minimize the introduction of potentially hazardous or irritating substances into the building.
• Other potential sources of air quality contaminants, such as workrooms and janitorial closets, are contained by full height walls, where a negative pressure is maintained and air is exhausted directly to the outside.
Project Team
Architect   B. H. Bocook Architects, Inc.
4041 El Camino Way
Palo Alto, CA 94306
Interior Design   Hawley Peterson & Snyder Architects
100 View Street, Suite 100
Mountain View, CA 94041
MEP Engineer   C & B Consulting Engineers

Critchfield Mechanical, Inc.
4085 Campbell Ave.
Menlo Park, CA 94025
Electrical Engineer   The Engineering Enterprise
Commissioning   CTG Energetics, Inc
16 Technology Drive, Suite 109
Irvine, CA 92618
Landscape Architect   The Office of Cheryl Barton
65 McCoppin Street
San Francisco, CA 94103
Leed Coordinator   Simon & Associates
200 Brannan Street
San Francisco, CA 94107
Developer   Ford Land Company
Menlo Park, CA
Contractor   Vance Brown Builders
3197 Park Blvd
Palo Alto, CA 94306
Project Manager   Bennington/Conover & Associates
1547 Rainbow Drive
Cupertino, CA 95014
Additional Information
Awards   • U.S. Green Building Council LEED-NC, v2 Gold (2002).
Sources   • The William and Flora Hewlett Foundation website
• Recycleworks website (San Mateo County)
Contact   Primary Contact
Kailasam Senthil
Critchfield Mechanical, Inc.
4085 Campbell Ave.
Menlo Park, CA 94025
Center for the Built Environment (CBE) | University of California, Berkeley.
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