Sbrega ZNE featured in Metropolis

The Sbrega Health and Science Building is featured, among other projects, in an article in this month's Metropolis exploring the role of architecture on community college campuses in the US. Among the topics explored are experiential learning, place-making, and identity. Read more here.


Statement on Mr. Trump's pullout from Paris

Big Bend Studio is disheartened by Mr. Trump’s recent decision to abandon the Paris Agreement, a complex one that the United States played a key role in drafting in 2015, and that, as of today, 148 of 197 parties have ratified. Despite this extraordinarily dubious move, we do not intend to change our way of doing things. As we have seen since the Rose Garden announcement, numerous states, cities, organizations, and individuals have denounced the decision while reaffirming their commitment to the accord. The EU and China appear ready to work with states and cities to do the critical work necessary to stay below the two degree celsius threshold. In the absence of leadership at the federal level, we will continue to promote low and zero energy architecture, encouraging our clients to keep carbon in the ground. The livability of our shared home is at stake.

Meltwater off an ice cap on Nordaustlandet, Norway (Photo: Paul Nicklen)

Meltwater off an ice cap on Nordaustlandet, Norway (Photo: Paul Nicklen)

Boston Architectural College Fall 2017

Jim Moses and Adam Mitchell, who have taught advanced design studios together at the Boston Architectural College since 1998, will teach an advanced workshop, 'Exploring Architectural Themes through Case Study' in the Fall 2017 semester. The course will focus on exploring a particular architectural theme using the case study method to analyze existing, but less studied, buildings by well known architects. Here is an excerpt from the course description: 

The word ‘innovation’ derives from the Latin innovationem, which according to the Etymology Dictionary dates to 1540, and stems from innovatus, past participle of innovare "to change; to renew," from in- "into" + novus "new". It means "a novel change, experimental variation, new thing introduced in an established arrangement". A specific relationship to what came before, a precedent, is implicit in the word. Innovation does not occur in a vacuum, but in context, in this case, a history.

This course takes aim at ‘an established arrangement’, while at the same time understanding that that arrangement may itself represent an innovation. In it, each student will be asked to do a deep exploration, a case study, of a single work of architecture - a building and its attendant landscape - from a list of important, thematically related pieces. The goals are:

  • to luxuriate in getting to know a work of architecture extremely well;
  • to hone analytical skills through curiosity, close observation, and critique;
  • to present findings in a clear, concise, and confident way;
  • to contribute to the collective knowledge of your colleagues and, perhaps, the discipline.

The basis of the case studies will be primary (to the extent available) and secondary documentation (drawings, models, photographs, text). Deliverables will include the range of descriptive/interpretive products that will serve as a kind of de- and reconstruction, and culminating in a final report. Class meetings will take the form of seminars and pin-ups.

While the case study will quite readily, and purposefully, expose the ‘how’ of a particular work, at the same time the operative question will be ‘why?’. Issues inherent to context, intent, construction, and occupation will be unavoidable.

Tradeline Features Bristol Sbrega in Geothermal Article

Tradeline has published an article on the use of ground source heat pump technology as a means of reducing or eliminating carbon-based heating and cooling in laboratory buildings. Bristol Community College's Sbrega Health and Science Building is featured as an example of projects that have recently employed the technology successfully as one aspect of a comprehensive set of strategies aimed at achieving zero net energy (ZNE). Tradeline is an organization the promotes innovation in the planning, design and operation of science, technology, engineering, and mathematics (STEM) buildings and environments in both academic and corporate sectors. Read the article here.

Bristol Sbrega Earns 2017 AIA COTE Top Ten Award

Bristol Sbrega has been honored this year with an American Institute of Architects COTE Top Ten Award. According to the AIA, "the COTE (Committee on the Environment) Top Ten Awards is the industry’s best-known awards program for sustainable design excellence. Each year, ten innovative projects earn the prize for setting the standard in design and sustainability." Presentation of the award will take place in Orlando at the annual convention of the AIA, the Conference on Architecture. Read more about the project here: COTE Top Ten 2017.

Bristol Sbrega presented at MED|Ed Conference

The Sbrega Health and Science Building will be presented 5 April 2017 at the annual MED|Ed Facilities conference at the Seaport World Trade Center in Boston. In a session entitled "A Zero Net Energy Teaching Laboratory - The First 6 Months", Jacob Knowles, Tony Petone, and Chris Widzinski from BR+A and Nathan Butt from Sasaki will discuss the design process, strategies for achieving zero net energy, and performance over the first six months of occupancy using data gathered for the enhanced monitoring and verification systems. MED|Ed Facilities Boston describes itself as "the premier conference for healthcare and educational facilities in New England."


'Tolerance': final review at offices of Cambridge Seven Associates

Just prior to the winter holidays, Cambridge Seven Associates hosted the final review of the eighteenth edition of the Mitchell Moses Studio at the Boston Architectural College, 'Tolerance'. Seven students presented a semester's worth of work to a group of practitioners from around the city. The work of the semester revolved around a conversation on the connotations of the word 'tolerance' within and outside the discipline of architecture.

Zero Net Energy: A Q&A with Jim Moses

This was authored by Jim Moses and originally posted on 12 November 2015.

Jim Moses, RA, LEED AP, and BR+A's Director of Sustainable Design, Jacob Knowles, recently presented on Bristol Community College's John J. Sbrega Health and Science Building, the campus' first Zero Net Energy (ZNE) building, at the Tradeline College and University Science Facilities 2015 conference. Read on for a Q&A with Jim:

Q: As the project designer from Sasaki Associates for Bristol's ZNE building, can you give a brief overview of what ZNE means and what the building strategies are?
A: In the strictest sense, ZNE is defined as an annual balance of energy consumed and energy produced by a building, such that one negates the other. This can be difficult to achieve in the context of a science building, where energy use intensity (EUI) tends to be very high, mainly because of ventilation, heating, and cooling requirements. The overarching approach is to drive the demand side of the equation as low as possible and practical, eliminate fossil fuel-based heating and cooling, and employ building and/or site-generated renewables to power the building. The combination of strategies may look different depending on the building type. At BCC, about seventy percent of our energy savings came from reducing ventilation demand (using filtration fume hoods, reducing minimum air changes by monitoring air quality, and enthalpy wheel heat recovery); about fifteen percent from using efficient heating and cooling technologies (localized cooling and a hybrid source heat pump); and about ten percent from passive architectural strategies like shading, high efficiency glazing, high performance envelope, and LED lighting. User behavior is critical as well and accounts for about five percent of the expected reductions: natural ventilation, expanding the allowable indoor temperature range, and using laptops are all important pieces of the puzzle. Relative to our baseline building (290 kBtu/sf-yr), we reduced EUI by about 80% to 55 kBtu/sf-yr.

Q: What opportunities and challenges do these buildings represent both during construction and throughout their lifecycles? As we see with Life Cycle Cost Analyses (LCCAs), utilities and facility maintenance play a huge part in the overall cost of a building—how do those costs differ for a ZNE building in comparison to a traditional building?
A: Construction challenges, which exist regardless of whether a building is ZNE or not, will depend on the technologies employed and whether they're familiar to local trades. The best bet is to pre-qualify the right subcontractors, something that unfortunately is not always possible in a public bid environment. 

The operational savings are where the rubber hits the road. The savings at Bristol is real money that can be used for meaningful things instead of being burned. There may be some unique maintenance challenges related to new technologies, or technologies that might be new to a particular client. In general, though, the goal is to use familiar technologies in a smarter way. As long as buildings are designed, built, and used by human beings on Planet Earth, they will need to be maintained. The better they are maintained, the longer they will last and have uses beyond what they were originally designed for. 

The issue of capital cost is interesting too; at Bristol we had to show the client that we could accomplish ZNE within a fixed budget. With a carefully considered and holistic approach, we were able to balance costs and savings. At the end of Schematic Design, the ZNE building cost about $200,000 less than a "high performance" building, not including operational savings. As renewables are becoming more competitive with fossil fuels, it's hard to imagine we won't see more of these projects in the near future. Many of our clients have climate action plans that aim for carbon neutrality by 2030 or 2050. For many, it will be difficult to achieve those goals without including ZNE buildings in their portfolios. 

Q: How many ZNE buildings have been built? 
A: Unfortunately, there's not a reliable database of ZNE buildings worldwide. In the US today it looks like there are about 40 (according to the New Buildings Institute). More than half of those are on the West Coast, where the climate is very moderate. When we began developing the Sbrega Building's ZNE approach, we had a hard time finding good precedents for what we were trying to accomplish. Not only were there few models in our climatic zone, but also there were few with the same baseline energy intensity. Finding both in the same project was impossible, so in a sense we were reinventing the wheel. 

Q: As interest and awareness spreads, has the number of ZNE buildings begun to shoot up, or is growth still pretty linear?
A: I don't know that I can answer the question of growth. But interest seems to be increasing. Our Tradeline session, for example, was very well attended and the attendees were extremely engaged. This certainly has something to do with the makeup of the audience, who spend at least part of their time worrying about the heavy energy expenditures of science buildings. It's also been true generally in the last year and a half when we've presented the project: lots of interested people asking informed questions.

Q: A community college seems an unlikely candidate to invest in such a facility. Can you give some insight into Bristol's decision to pursue this project?
A: It probably begins with Jack Sbrega, the president of the college, who was a founding signatory to the American College and University Presidents' Climate Commitment (ACUPCC). That represents a statement of seriousness with regard to climate change, because there are ongoing reporting requirements that are in the public domain. Anyone can see what kind of progress your institution is making toward its goals. BCC's climate action plan sets a goal of carbon neutrality by 2050—especially ambitious for a commuter campus, half of whose emissions come from vehicles. Over the last ten years or so they've implemented a number of renewable energy projects, including putting PV arrays on almost every roof. They were awarded a grant to fund the installation of a wind turbine, which unfortunately and unsurprisingly was stopped by neighbors. Fortunately for our project, those funds were redirected to the Sbrega Building for a rooftop PV array and to defray the cost of the heat pump system. Probably the most significant thing the campus has done so far is to enter into a power purchase agreement with a provider, who built a 3.2 MW PV array on one of the parking lots. This allowed the array to be built at no cost to the college and gave them a fixed rate for electricity for twenty years. It also provides them with a shaded parking lot and one they won't have to plow in the winter.

Q: So, a ZNE building is obviously the "whole package": a single building entirely off the grid. What advice do you offer to clients who are not interested or unable to pursue a ZNE building, but are interested in implementing some ZNE building systems? If they can only choose a few high-performance, off-the-grid systems, where should they start?
A: I think it's important to clarify that a ZNE building is not necessarily "off the grid." In the case of Bristol, the energy they generate on site goes back into the grid. It's unlikely that the grid is going to become obsolete. The means of generation is beginning to shift from fossil fuels to renewable sources, and that generation will become more distributed, but the grid will most likely remain because so much has been invested in building it. 

ZNE is not so much about picking items from a menu as it is about recalibrating a mindset to a more holistic approach of looking for the most appropriate combination of strategies for a given project, which reduce energy use and eliminate reliance on fossil fuels. But to try to answer the question directly, if the goal is to wean ourselves off of fossil fuels, the burning of which contributes to a warming planet, it seems like a good place to start would be in generating renewable energy. Our clients tend to own numerous buildings and open land, both of which present opportunities in their surface area. This was Bristol's approach: installing photovoltaics on the roofs of their buildings, as well as building a site based array. At the same time, each new construction and major renovation project should look for the mix of strategies appropriate to the project. 

Q: What are some other big questions you encounter when talking about ZNE? Have you come across much criticism or disbelief?
A: The scepticism we've encountered has more to do with concerns about the claim that the Sbrega Building is ZNE when we are not generating enough power on the building to balance consumption. We needed twice the roof area available to us to fit enough PV on the building. We're able to say the building is ZNE because Bristol will buy back on the open market the Renewable Energy Certificates (RECs) produced by their campus array. This is more a question of accounting than anything. If the Sbrega Building is operated according to the energy model, it will use less than 20% of the campus PV array. For campuses, a combination of building and site based renewables, together with demanding much greater efficiency in new and renovated buildings, is the way to achieve a ZNE portfolio. As owners of often millions of square feet of buildings, colleges and universities are in a unique position to lead the way, showing that it makes environmental and economic sense to push for ZNE.

Q: What benefits does a ZNE design offer the client and the environment? Are there other beneficiaries?
The major benefits to the client have to do with operational cost savings, which frees up funds for other uses. At Bristol, between the Sbrega Building and the site PV array, we're anticipating annual savings of $230,000, which is equivalent to annual tuition for about fifty students. The environmental benefits have to do with shrinking the market for carbon based technologies, while growing the market for renewables; as Bill McKibben (founder of said in praise of President Obama's recent decision to kill the Keystone XL pipeline project, "keep carbon in the ground." If carbon stays in the ground it's not being burned and emitting greenhouse gases. We're particularly excited about the Sbrega Building because it will show that it's possible to achieve ZNE for a science building, an energy-intensive building type, in a relatively cold climate. 

It's our hope that, beyond the building operating at ZNE, it becomes a model for other building owners and designers. That would begin to magnify the impact of the project. Tradeline is only the latest of numerous talks we've been giving about the Sbrega Building. We're working hard to get the story out there and inspire people to seriously consider this approach as they plan their projects. 

Truly, we're all beneficiaries. Over the summer the Department of Defense published a report describing the national security implications of climate change. There is a fairly convincing argument being made now that the war in Syria and ongoing mass migration we are seeing from Syria to Europe began with drought caused by climate change, and exacerbated by political indifference, or worse. The Pentagon says that this will become more the norm as the effects of climate change accumulate. Keep carbon in the ground.

Zero Net Energy Without Adding Zeroes to Cost

This was authored by Jim Moses and originally posted on 21 March 2015.

A Zero Net Energy (ZNE) academic lab-science building is without precedent in the Northeast, but in 2016 Bristol Community College will lead the way in achieving this feat with the completed construction of its John J. Sbrega Health and Science Building, designed by Sasaki Associates. Achieving ZNE means the amount of energy required annually to operate the building will be offset by an equal amount of energy generated onsite. This is no easy accomplishment in a cold climate like Fall River, Massachusetts, where Bristol's campus is situated, but Bristol is a school uniquely dedicated to achieving ZNE.

Bristol has committed to reaching carbon neutrality on its entire campus by 2050. The school drafted a climate action plan* and is making aggressive moves to realize it. With ambitious goals in sight, Bristol and the Sasaki team, which included BR+A and Haley & Aldrich, raised the stakes on the sustainable design of the Sbrega Health and Science Building project, aspiring to make the new building not only an elegant and inviting design, but also a showcase of sustainable building on cold-climate campuses. The building will surpass the state-mandated minimum LEED® Silver certification, which has been required for new construction and major renovations of state-owned buildings since 2007.

In the design and construction of the Sbrega Health and Science Building, the team systematically uncovered ways to eliminate the use of fossil fuels, increase efficiency, and dramatically reduce demand—three critical components of ZNE design—while managing to adhere to a budget which had been confirmed and justified to the state legislature in a pre-design feasibility study. 

Eliminating the Use of Fossil Fuels
The design team set out to eliminate the use of fossil fuels for heating and hot water by implementing two strategies: a dual source heat pump for air and ground and a solar-powered hot water system. The heat pump design allows for a wider ground-temperature range, yielding a reduction in the number of wells. By coupling the system with an air source component, it allows for seasonal optimization, using air in the more temperate shoulder seasons and summer.

The second component of the ZNE design was the ability to tap into the site-scaled 3.2 megawatt solar array** that had been constructed as a separate project. As a standard high-performance design, the building would have used half the power produced by the array, but the more stringent ZNE design uses only about 17%. The building itself also has its own rooftop PV array that helps offset some of the power usage, although the rooftop array alone is not of sufficient size to power the building.

Reducing Demand
Finally, the design team's hunch was that energy demand was driven largely by the 18 fume hoods in the building, designed to exhaust 100% outside air, recirculating nothing. The team recognized the necessity of fume hoods for user safety, and found a viable solution in filtration fume hoods. After much research, discussion, deliberation, and ultimately, the integration of 24/7 air-quality monitoring, Bristol agreed to adopt this relatively new technology. In so doing, Bristol was able to achieve several other energy conservation measures and reductions in first costs, capturing dramatic cost-savings and making adoption of the ZNE approach feasible in the eyes of both the college and the state.

Among the energy conservation measures that followed from this one decision were the following:

•    67% reduction in hourly air changes
•    enthalpy wheel heat recovery
•    decoupling of cooling/heating from ventilation, using fan coil units for local cooling based on space occupancy
•    67% reduction in air handling capacity

A number of significant capital cost reductions followed:

•    reduction of the lab exhaust system, including associated stainless steel ductwork
•    reduction in supply ductwork
•    reduction in air handling equipment quantity and size
•    reduction in floor-to-floor height
•    reduction in building envelope area

Additional Strategies
The team also employed a number of passive strategies to capture still greater energy and cost savings, including the following:

•    implementation of a high-performance envelope by increasing r-value and decreasing thermal bridging and air leakage
•    expansion of the interior temperature range to 70-76 degrees
•    leveraging of natural ventilation
•    reduction in glass use, achieving a 22% window-to-wall ratio
•    self-shading
•    50% reduction in lighting power density

The Reasonable Approach
The great success of this pioneering project is twofold. It is an achievement in design ingenuity, stakeholder alignment, and technological execution, certainly. However, one of its most valuable attributes is its net zero budget execution—a result of taking a holistic approach, rather than simply putting together an unrelated menu of sustainable measures. 

In an environment of great fiscal constraint across the education sector and growing pressures to reach higher benchmarks of sustainability, navigating seemingly competing forces is the linchpin of success. The team invested in early side-by-side cost comparisons during the schematic design phase. Analyzing both a standard, high-performance LEED Silver building and the ZNE approach outline above, the team demonstrated the ZNE building could be constructed without increasing the budget. This delivery of a leading-edge ZNE building should be a game changer for Sasaki's future work across industries. In a world where effects of climate change are manifesting and all resources—including dollars—are limited, this seems the most reasonable approach.

*Bristol is a founding signatory of the American College and University Presidents' Climate Commitment (ACUPCC).

**The college built the array as part of a power purchase agreement (PPA) with a provider, wh0 paid for its construction. As part of the agreement, the college will pay a fixed rate for power for 20 years. After that term, the college may elect to purchase the array or have it removed and the site restored. In order to consider the building as ZNE, the college will need to buy back renewable energy credits (RECs) on the open market for the power generated onsite.