This month marked the 200th Anniversary of Henry David Thoreau's birthday, and in sync with this anniversary, the new, netzero Walden Pond Visitor Center in Concord, MA has earned LEED Gold Certification. The new facility will house interactive exhibits on writer, Henry David Thoreau, and a film about Walden Pond.
The LEED Gold Walden Pond Visitor Center, Concord, MA.
The visitor center – a project that's been 40 years in the making – includes a high-performance exterior envelope; energy-efficient heating and cooling systems; landscaping that mimics the natural habitat, as well as wood grown and processed in Massachusetts. The A/E team anticipates the design will provide a 48% reduction in energy costs and 37% reduction in water consumption compared to baseline building.
The new state-of-the-art Walden Pond Visitor Center welcomes guests from around the world to the state reservation. Walden Pond State Reservation, which is a National Historic Landmark, was made internationally known because of the literary works of naturalist Henry David Thoreau. Thoreau, who wrote ‘Walden; or, Life in the Woods’, which reflects on his time spent over the course of two years, two months, and two days in a cabin he built near Walden Pond, inspired the land conservation movement in the United States. To this day, Walden Pond State Reservation remains a heavily used state park with a popular public swimming beach, as well as other outdoor recreational opportunities such as hiking, boating, and fishing.
The new Walden Pond State Reservation Visitor Center features:
5,680 net square feet, approximately two-thirds of which will be dedicated to publicly available interpretive displays related to the life and legacy of Henry David Thoreau;
A south-facing orientation providing a wood and glass façade to maximize solar efficiency;
Superinsulation with increased roof, wall, and window values to conserve energy;
A 9 kilowatt (kW) solar hot water system;
A Variable Refrigerant Flow heat pump system;
A low flow plumbing system to reduce water consumption; and,
A 100 kW solar canopy array in an adjacent parking lot that will generate more than enough clean renewable power over the course of a year for the visitor center.
Congratulations, The Green Engineer (USGBC MA Chapter Sponsor), on the achievements of this wonderful project!
Harvard is striving for excellence in the green building industry, as they just announced that their next project will be retrofitting a 1940s stick-built house that will be used for their headquarters. The new house is projected to use no HVAC system, no electric light use during the day, 100% ventilation, almost zero energy, and produce zero carbon emissions, including embodied energy of materials. Before now, this level of efficiency was only being achieved in new construction projects, making this HouseZero Project the first-of-its-kind.
Inefficient existing buildings are one of the nation's biggest energy problems and Harvard is setting a precedent on the possibilities in a retrofit that can be replicated almost anywhere. HouseZero not only reduces the demand for energy but also saves money for property owners by significantly lowering operating costs.
The plan is to replace the current HVAC system with thermal mass, and a ground source heat pump for peak (extreme) conditions. A solar vent will instigate buoyancy-driven ventilation and triple-glazed windows will employ natural cross ventilation through a manual and automated system that monitors for temperature, humidity, and air quality. Much like a layered approach to clothing, the house is meant to adjust itself seasonally, and even daily, to reach thermal comfort targets. Construction for this project will take about 7-9 months; check back in at the end of the year for new photos and updates.
Can a building designed to meet LEED certification be adapted to meets Passivhaus standards?
Recent research released by FXFOWLE into how New York City buildings can meet energy efficient Passivhaus standards featured contributions from two Simpson Gumpertz & Heger (SGH) staff members. Senior Principal Sean O’Brien and Staff II Brienna Rust were coauthors on “Feasibility Study to Implement the Passivhaus Standard on Tall Residential Buildings,” which explored the impact of adapting a building designed to meet LEED certification to one that meets Passivhaus.
Passivhaus is a design concept developed in Germany that uses architectural solutions like stringent air tightness and minimized thermal bridging to create buildings that consume very little energy. The New York State Energy Research and Development Authority sponsored this project to explore the viability of this approach for energy efficiency in the local construction industry. FXFOWLE led the study, and several other engineering and consulting firms contributed to the project.
The researchers compared a base case high-rise, mixed-use building in Queens, NY, seeking LEED v.3 Silver Certification with an adapted design to meet Passivhaus requirements. “The study examines the impacts of achieving the standard from architectural, enclosure detailing, mechanical, structural, constructability, resiliency, zoning, and code perspectives,” wrote the authors. They found a 47% reduction in primary energy consumption from the base model and an 85% reduction in heating demand, offset by a 2.4% initial cost increase and a 24-year payback.
“The findings of this study suggest that it is viable to design large high-rise residential buildings in New York City to meet the Passivhaus standard” with minimal aesthetic changes, the authors conclude.
Sean will present the results of this study as part of an expert panel discussion on 29 April at the AIA Conference on Architecture 2017 in Orlando, FL.
USGBC MA Chapter Sponsor, Levi + Wong Design Associates set an example for how to incorporate sustainable design into all aspects of design practice. Over half of the professional staff is LEED accredited, and as a whole, the firm believes sustainability is not an “added value” to otherwise conventional projects, but rather a thought process embedded in every step of project design.
From site design to envelope analysis to daylighting studies to material selection, Levi + Wong Design projects embrace a holistic approach to systems and materials. The firm offers clients a proactive, research-based, budget-conscious approach aimed at delivering cost-effective, maintenance-friendly, healthy buildings.
The firm considers short term performance metrics such as daylight harvesting, total energy consumption and water use, as well as the long term impacts of potential future expansion and infrastructure replacement. To Levi + Wong Design, sustainability is really just another term for good, common sense design, employing materials and systems that minimize waste, maximize performance and deliver the best value over the life of the project.
An example of this holistic approach is exemplified by The D’Youville Center for Advanced Therapy in Lowell, MA. The 25,000 square foot state-of-the-art facility is designed for a single site experience that supports the needs of patients across the continuum of care.
To promote healing and wellness, natural light permeates through windows strategically located in corridors, patient rooms and therapy spaces drawing light into interior spaces. The large windows views in the rehabilitation gym create a connection with the local neighborhood and exterior courtyards allow patients access to outdoors relaxation and community re-entry training experiences. A clean modern look was created using simple forms, detailing, and proportion, and was complimented with natural materials such as wood and stone to create spaces that are warm and comfortable.
The Green Engineer, Inc. is a sustainable design consulting firm specializing in solutions to design, build, and operate buildings with improved energy efficiency and reduced impact on the environment. Founded in 2005 by Chris Schaffner, PE, LEED Fellow, the firm has a technical staff of fifteen LEED-Accredited Professionals. The expert team brings to the table experience and perspective from a variety of backgrounds including engineering, architecture, construction, planning, development, and public policy. We practice Integrative Design and see sustainability as a core goal shared by design team members and stakeholders. Our practice uses tools such as energy and daylight modeling and life-cycle assessment of materials to analyze performance and inform our decision-making. We also consult for non-LEED clients, including affordable housing and other non-profit developers. To date, we have managed or been involved in more than 122 LEED certified projects in New England and around the country.
At left, Principals Sarah Michelman, Chris Schaffner, and Erik Ruoff
The Green Engineer Principal, Chris Schaffner, and Project Manager, Ryan Montoni, are now officially licensed as BREEAM USA In-Use Assessors, and The Green Engineer is now a BREEAM USA In-Use Assessor Organization.
BREEAM USA In-Use is a comprehensive and holistic environmental assessment method for assessing and rating the sustainability of existing, commercial assets located within the United States. BREEAM In-Use is applicable to any existing commercial building – regardless of its size or condition. There are no prerequisites or other barriers to using the BREEAM In-Use standard.
