As a precursor to my discussion, “The All-Glass Building – Is Energy Efficiency Possible?” at BuildingEnergy 15 next month, NESEA published an article about that very topic. In it I explored the benefits of a glass façade (daylight) and the drawbacks.
The All-Glass Building
Is Energy Efficiency Possible?
Glazed towers dominate the skylines of our cities. However, most have been designed with little thought as to the climate in which they are located or the environmental impact they might have. According to the Commercial Building Energy Consumption Survey (CBECS) in 2003, 70 percent of energy use in commercial buildings is from the lighting and HVAC systems. The performance of both of these systems is directly related to the design and performance of the building envelope. Sealed, glazed façades, now so ubiquitous, lead to higher heating and cooling loads as well as glare and thermal comfort challenges.
Despite these challenges, many design teams pursuing sustainability continue to use all-glass façades because of their ability to connect interior and exterior environments. The market continues to demand, and architects to deliver, high glazing percentages for the daylight, views, and marketing potential they provide in green buildings. Such designs are difficult to make energy efficient, but many argue that fully glazed buildings, when designed correctly don’t increase a building’s energy usage.
Northeastern EXP features an organic pinwheel design, shaping research and classroom neighborhoods with shared community spaces radiating from the core to define each area. The building façade was tuned to achieve a 78% reduction in peak solar heat gain and a 62% reduction in cumulative solar radiation leading to energy use reductions and reduced mechanical system sizing. The use of stainless steel further leads to an embodied carbon reduction of almost one million tons when compared to aluminum while the natural stainless surface reflects light in a natural and warm tone giving the building an inherent energy.
#earthweek #designalways #buildingscience #performalism