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Affordability was the main objective in both the design and construction process, but our favorite feature is the rooftop sprinkler cooling system that provides evaporative cooling by spraying collected rainwater onto the roof surface at night. The house then reuses that chilled water by filtering and then pumping it through a radiant floor slab to cool the interior during the day. To keep prices at a minimum, the Aggie Sol house is prefabricated offsite as two separate halves in a factory and can be quickly transported onsite, where it’s assembled and made livable in a matter of days. The UC Davis team also sourced their materials as locally as possible to minimize shipping and construction costs. The building’s use of in-line balloon framing even uses 30% less lumber than conventional framing methods.

UC Davis Aggie Sol, Aggie Sol by UC Davis, Solar Decathlon, Solar Decathlon 2015, UC Davis Solar Decathlon, Aggie Sol Solar Decathlon, affordable sustainable housing, affordable housing, heat recovery system, solar tubes, butterfly roof, passive design, sunshades,

Since Aggie Sol was designed with farmworkers in mind, the house includes two entryways with a dedicated cleansing room where farmworkers can wash off their work-related debris before entering the home. The modular home also includes a spacious open-plan living room, dining area, and kitchen; two bedrooms; a bathroom; and a mechanical room. An outdoor enclosed deck expands the footprint of the house.

Related: Stunning solar-powered GRoW Home has a thriving veggie greenhouse at its core

Passive design techniques, such as minimal use of windows, operable exterior sunshades, and a light-colored exterior, help minimize solar heat gain. To maintain access to natural light, the design team installed solar tubes, a kind of flexible reflective tubing that funnels sunlight from the roof to the interior. A sloped butterfly roof with solar panels tops the structure to drain rainwater into a reservoir that’s used in an underfloor radiant cooling and heating system that maintains comfortable temperatures year-round with minimal energy use. A heat recovery system recycles energy from domestic grey water to preheat potable water.

The UC Davis student team designed and built Aggie Sol for the Solar Decathlon 2015. After the competition, the team will permanently locate Aggie Sol on the UC Davis campus for student housing.

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+ Inhabitat Solar Decathlon Coverage

Images via Aggie Sol, Mike Chino for Inhabitat