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Zero Energy Homes <ZEH>


Zero Energy Homes (ZEH) are homes designed to use zero net energy from the utility grid. The concept is simple — couple the maximum possible building energy efficiency with the best available renewable energy resources in a way that maximizes the effectiveness of both

For a glimpse of the houses of tomorrow, one need look no further than the work of a few forward-thinking production builders. Combining solar energy technologies with energy-efficient features and energy-saving construction techniques, these builders are constructing houses that generate nearly as much electricity as they consume on an annual basis.

Constructing the Zero-Energy Home
A key element in designing a near-ZEH is that the house’s overall energy use first must be dramatically reduced through a combination of super-efficient features and advanced construction practices. The use of these energy-saving building methods ensures that the addition of a relatively small photovoltaic (PV) solar system (typically 2.4 kilowatts in capacity) can effectively lower the electricity usage of a house by half or more compared to a typical new home.

For instance, a typical house has 20 percent to 30 percent duct leakage. In a near-ZEH, ductwork is sealed and super-insulated or placed in the conditioned space. Spectrally selective glazed windows reflect the sun’s heat in summer and reduce heat loss in winter. Mechanically designed HVAC systems account for bends and turns in ductwork, register locations, duct length, connections and airflow. Other ways to “tighten up” residential energy consumption include improved ceiling and wall insulation, energy-efficient appliances and the use of fluorescent lighting. All of these efforts are combined in a whole-house approach to designing and building the ZEH.

Once a house has been made super energy efficient, an array of PV modules is installed. Usually located on the roof, the array converts sunlight into direct current electricity, and through the use of an inverter, turns DC into AC electricity to power the house. Many builders prefer building-integrated photovoltaic (BIPV) systems, which are built into the roofing materials. For multiple reasons, mainly aesthetics and to minimize roof penetrations, BIPV systems are a good choice for productionhouses.

Zero Energy Homes have a number of advantages:

Improved comfort—an energy-efficient building envelope reduces temperature fluctuations.
Reliability—a ZEH can be designed to continue functioning even during blackouts.
Security—a home that produces energy protects its owner from fluctuations in energy prices.
Environmental sustainability—a ZEH saves energy and reduces pollution.

Zero Energy Homes optimize and include the following design features:

Climate-specific design
Passive solar heating and cooling
Energy-efficient construction
Energy-efficient appliances and lighting
Solar water heating system
Small solar electric system.


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