Page 78 - Zero Net Energy Case Study Homes-Volume 1

CASE STUDY NO. 4
MERITAGE PRODUCTION HOUSES
(Below) Table of basic prop- erties of houses in the ZNE Study Group.
The relevant “program” for the houses of the ZNE Study Group is given in the table below, which lists the house floor areas, the designated model type, a description of the solar PV array and the if battery energy storage is included.
Site Constraints
The single-family houses are planned according to a typical approach to site planning for produc- tion house subdivisions—good vehicular access and maximizing the number of units among the most important. The houses in the ZNE Study Group are indistinguishable from the rest of the subdivision, embedded within the larger collection of similar houses and relying on materials and technology to achieve ZNE performance.
The metered data for these houses for the period August 2016 through July 2017 showed that only two houses achieved a ZNE performance: House #7 and House #12. These are indicated in the aerial image on the opposite page of the portion of the site occupied by the ZNE Study Group and the control group for data analysis in the EPRI study.
The remaining 18 houses of the ZNE Study Group can be characterized as near-ZNE, ranging from 24% ZNE to 77% ZNE, with most houses clustered at the upper end of that range, accord- ing to the EPRI data.
This case study now focuses on the ZNE-performers, House #7 and House #12.
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Zero Net Energy Case Study Homes: Volume 1