Delivering Affordable Net-Zero Energy Housing

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The eCasa housing project was designed to deliver a series of net-zero, affordable housing prototypes in Washington, D.C., for low-income families. Using Sefaira, nonprofit architecture firm Inscape Publico balanced building envelope performance and renewable energy generation in the late design stage to achieve net-zero. 

Mi Casa Inc., a nonprofit organization, provides affordable housing opportunities to low and moderate-income families to sustain diverse and healthy communities in the Washington D.C. and Baltimore areas. To address the complex changes impacting neighborhoods in the greater D.C. area and ensure scalability, Mi Casa collaborated with the Department of Housing and Community Development.

Navigating project limitations

Inscape Publico had designed and specified the building blocks but wanted to understand their performance and optimize the project where possible. The project needed to juggle a limited budget, a limited palette of building materials, and a tight project timeline. Using Sefaira analysis enabled the team to optimize the changeable factors within the project and demonstrate that the project was on track to achieve net-zero energy.

Site plan showing the location of both blocks on adjacent streets.

To achieve their goals, the design team needed to:

  • calculate the baseline building performance based on specified building materials.
  • minimize energy consumption to achieve net-zero by utilizing high-performance construction and specifying high-efficiency appliances and systems.
  • calculate how much renewable energy would be generated by pre-specified solar photovoltaic panels to confirm the quantity required to achieve net-zero.
  • minimize annual operating costs for the inhabitants by specifying highly efficient water fixtures.

To get started, the design team set up the analysis model, inputting pre-determined envelope and HVAC values and baseline variables such as occupancy, lighting power density, plug load, temperature set points, and diversity factors. Next, potential strategies were investigated:


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