Windows are a key part of the building enclosure, but they are also the costliest, most fragile, and worst thermally performing component. We will present on windows from our viewpoint as building enclosure consultants and forensic failure specialists. We will explore energy and comfort impacts of glazing and glazing ratios, and then move on to water control detailing and the window-to-wall interface. Covered topics will include sill pan and rough opening flashings, “innie” vs.

The Massachusetts Maritime Academy consists of 16 buildings comprising approximately 600,000 sf, with heating for the buildings is provided by gas fired hot water boilers in each. They have undertaken a planning effort and initial design for a distributed campus-wide ground source heat pump system, combined with extensive energy retrofits. The plan consists of a neutral temperature Energy Transfer Loop that will tie various geo-exchange systems together to feed heat pump plants in each building.

Curtis + Ginsberg Architects has completed 6 multifamily Passive House buildings, with two more in construction and six more in design. Steven Winter Associates has completed over 20 Passive House buildings, with 15 more in construction and 30+ more in design. We have collaborated on many of these projects. By reviewing variations in the systems, we can draw conclusions about what works best for structure, envelope, ventilation strategy, heating and cooling systems, and on-site generation.

Recent technology developments and incentive programs are creating new opportunities for ground-source heat pumps (GSHPs) at the building and neighborhood scale (networked geothermal). Practitioners designing and piloting GSHPs will describe how GSHPs can reduce the environmental burden on LMI communities by decarbonizing space and water heating.  Through design and case studies, they will describe what characteristics make a building or neighborhood a promising fit for GSHP implementation, and those posing significant challenges.

Electrification of HVAC systems and the elimination of fossil fuel heating in high rise building space conditioning systems poses unique design and system selection challenges.  Presenters will share two case studies for the design of VRF HVAC, one using air-to-air systems and one using air-to-water systems. They will discuss challenges including maximum piping lengths, acoustical restrictions, and airflow problems, and solutions including closely spaced condensers using CFD analysis and the design of access to piping and wiring in large condenser farms.

Before PVs became affordable, excess solar energy was stored thermally. Energy storage, both thermal and electrical, aids grid penetration of renewables and builds resilience on-site. We’ll look at passive and active thermal storage in advanced buildings, either integrated with the structure or as remote storage. We’ll also look at battery storage in an off-grid project and hydronic storage in a proposed small commercial project and show via an interactive model the effects of varying PV and storage capacity, and how storage increases the percentage of solar energy used on-site.

We will present tales from the trenches for ventilation approaches within the context of the Passive House building certification standard. This standard has set a high benchmark for low-energy buildings and is widely known as the most rigorous energy efficiency standard currently available. Attendees will learn how balanced ventilation is best applied in a cold climate at a large scale and how commissioning plays a key role in this process.

Bruce Becker is the architect, developer, owner, and operator of Hotel Marcel. He will discuss the conversion of the formerly vacant Pirelli Building in New Haven into Hotel Marcel, a 165-room LEED Platinum all-electric boutique hotel and conference center which is the first Passive House certified hotel in the United States. The discussion will include electrification (no fossil fuels including 100% of HVAC, hot water, kitchen, and laundry), power over Ethernet (POE) for all Lighting and Shades, and micro-grid creation for resilience with 1 megawatt-hour of battery storage.

Concrete accounts for approximately 11% of annual global carbon emissions. It is a material too important to ignore. Learn how BU’s Center for Computing and Data Sciences applied low-carbon concrete goals and selected structural elements to reach the highest Portland replacement concrete in Boston to date. See how opportunities in design, construction and supply chain were used to substantially decrease the climate impact of concrete used. Then discover national and local low-carbon material initiatives that are underway and growing.

Public school projects are a highly visible commitment from a community towards future generations, serve a wide range of students from diverse backgrounds, and are a valuable resource to the surrounding community. This case study will show three projects that aimed to fit within the goals and budget of a public institution while focusing equally on energy, carbon, water, and waste. Linking the strategies for each goal to impacts on the health and well-being of students provides a new framework for evaluating the impacts of design.