BULLITT CENTER ,SEATTLE - CASE STUDY

BULLITT CENTER ,SEATTLE

SUBMITTED BY: APURWA KUMARI

ABOUT Building Name: The Bullitt Center Bulding Location: Seattle, Washington,United States Construction Type: New Construction (including public and academic buildings) Size: 52,000sf Market Sector: Private Building Type: Office Delivery Method: Integrated Project Delivery Total Building Cost: $30 million Project Completion Date / Date Building Occupied: April 2013 Certification: LEED

Even in Seattle , which averages 226 cloudy days a year ,this rooftop has array of solar panels- which required a variance from the city to stretch out over the sidewalk- is designed to generate a surplus of energy from March through September to power the building throughout the year With oversize windows and high ceilings, 82% of the Bullitt center’s lighting is expected to come From the sun

The building’s goal of harvesting and treating all wastewater, hence the special toilet whose contents will be composted and decontaminated before being sent off-site for use as fertilizer

For temperature regulations, windows are programmed to open and shut automatically. At night ,a system flushes out excess heat and lets in cool air

To encourage people to skip the elevator, the staircase overlooks the city’s skyline

With on site filteration and room to store 56000 gal. of rainwater, the building can provide all its own water except the kind people drink. The latter won’t happen unless the city changes its codes for potable water

Since heating is typically responsible for 40% of a building’s energy use, a key feature in the Builitt Center’s quest for self sufficiency is its system of 26 geothermal well, each 400 ft. deep ‘ to warm it up in the winter and help cool it down in the summer

The wood frame is designed to extend the structures’s life span to 250 years, well beyond the 40 years financers expecting a conventional office building to last. And instead of relying on heavy timber from old – growth forests, building uses glue to bond smaller pieces of wood into larger components stong and stable.

DESIGN AND CONSTRUCTION ASPECT HIGH-PERFORMANCE ENVELOPE

• The well-insulated walls have been designed to eliminate thermal bridging and dramatically reduce air infiltration.

• Building massing and orientation, as well as glazing selection, control heat gain.

• Major glazing areas face south and north to improve daylighting and solar control.

• The building's windows, which open and close automatically in response to conditions outside, were selected for optimal control of heat loss and solar gain, while maintaining superb visibility for daylighting.

Natural daylighting also allows for beautiful views.

• An exit stair reimagined as the irresistible stair, a transparent glass stairwell located on an outside wall of the building offering views of the city skyline, Puget Sound, and Olympic Mountains, encourages occupants to walk between floors for health benefits, provides opportunities to interact with others, and to offset the energy demands of taking an elevator.

• The result for occupants is a healthier daily routine, a stronger sense of

community and the opportunity to impact in the reduction of energy use.

• Ensure equal use of the building for all and plan for flexibility. All spaces in

the building and throughout the site are readily accessible. Open floor plates can be easily configured to suit changing tenants needs.

SERVICES CLOSED-LOOP GEOTHERMAL SYSTEM AND VENTILATION

• The Center's very modest heating and cooling loads are met by ground source heat pumps and on-site geothermal wells.

• Water loops provide comfortable radiant heating and cooling to the office spaces.

• Ventilation is provided through a dedicated 100% outside air unit with an air-to-air heat exchanger, so that incoming fresh air is preconditioned by outgoing air.

RADIANT FLOOR HEATING AND COOLING WITH PASSIVE COOLING AND NATURAL VENTILATION

• Operable shading systems are designed for glare control to further mitigate solar heat gain.

• Operable windows provide free cooling and ventilation when ambient conditions are right.

DAYLIGHT DIMMING AND EFFICIENT LIGHTING DESIGN

• Daylighting drove the architectural

design and is the primary source of illumination in the building.

• Electric lighting loads in office

spaces have been limited to 0.4 Watts per square foot.

• Automatic controls will dim or turn off the LED lights when daylight provides adequate illumination.

However.

Open office spaces rely on natural daylighting as the primary source of illumination.

The building is energy and carbon neutral •The center’s energy efficiency is 83% better than a typical office in Seattle.

•242 kW photovoltaic array

• retractable external blinds that block heat from warming the building.

Roof-top photovoltaic array.

Automated external shades.

NET-ZERO WATER APPROACH •

Approximately 69% of the annual rainwater runoff is collected, stored in a 56,000 gallon cistern, treated, and used for potable and nonpotable uses.

•

Grey water is treated and evaporated/infiltrated onsite.

•

Through a combination of infiltration, evaporation on the membrane roofing evapotranspiration on the green roofs, and piped discharge, the building closely mimics the historic hydrology of the site.

•

The system supplies all non-potable water for building fixtures and is designed to meet all potable water needs when allow the building to use rainwater to supply 100% of its water needs.

Cistern for treating rainwater runoff.

• Human waste from foam flush toilets and urinals is delivered through piping to 10 basement composting units, • where wood chips manage moisture levels and consistent temperatures (135°F to 165°F) ensure pathogens and contaminants are sterilized or killed.

• Each composter produces approximately 90 gallons (12 cubic feet) of compost each year.

This valuable resource is taken to a nearby composting facility to be incorporated with other composted material, and used as a soil amendment.

Composting units.

P R O J E C T R E S U L T

• Annual Energy Use by Fuel

Electricity: 236,400 kWh (from solar array) Gas: n/a Fuel Oil: n/a Biomass: n/a Other fuel: n/a Total: 230,000 kWh

Annual On-Site Renewable Generation PV: 257,800 kWh Total: 257,800 kWh

Annual Energy by End Use Heating: 6,000 kWh Cooling: 5,600 kWh Fans & Pumps: 33,000 kWh Lighting: 53,000 kWh Domestic Hot Water: 7,800 kWh Plus Loads & Equipment: 131,000 kWh Other End Use: n/a

Peak Use Peak Electricity Demand: 40kw Peak Natural Gas Demand: n/a Peak Cooling: 1,000 ft²/ton Connected Lighting Load: 0.4 W/ft²

THE PATH TO NET ZERO

THANK YOU