Page 117 - Zero Net Energy Case Study Homes-Volume 1

The total measured monthly energy use in 2015 can also be charted according to type of unit (1BR, 2BR, 3BR, 4BR), showing higher energy use in the 3BR unit on a per-square-foot basis. The case of the 3BR unit is highlighted with the comparison of the modeled and measured charts shown on the opposite page and below.
Energy Production versus Energy Use: Zero Net Energy Performance
As previously described, a monthly utility allowance (in dollars) for each type of unit (1BR, 2BR, 3BR or 4BR) is determined by the combination of the output of the solar array and the average consumption of the building during that period. Essentially this is the method of apportioning the output of the single large solar PV array to the individual tenants—not a kWh share of the monthly or annual energy production but a direct dollar credit.
COLONIAL HOUSE MULTI-FAMILY HOUSING
CASE STUDY NO. 5
Measured Monthly Energy Use
Measured Monthly Energy Use - 3BR Average
Average 3 BR Unit
2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00
Jan Feb Mar 2015
Apr May Jun
Jul Aug Sep Oct
Nov Dec
Zero Net Energy Case Study Homes: Volume 1
105
kBtu/sq.ft.