Page 103 - Designing for Zero Carbon - Case Studies of All-Electric Buildings

REDFORD CONSERVANCY AT PITZER COLLEGE CASE STUDY NO. 4
Measured Monthly Energy Use
Measured Monthly Energy Use
(2018-2019)
3.00 2.50 2.00 1.50 1.00 0.50 0.00
49,300 kWh/year Measured EUI = 15.8 Modeled EUI* = 11.9
*Includes area of outdoor classrooms
Feb Mar
Apr May
Jun Jul
Aug Sep Oct
Nov Dec Jan
Energy Use — Actual Measurement and Comparison to Modeling Results
In such a small instructional building, individual metering of the energy loads did not seem practical. The data collected during the first full year of occupancy (2018) is therefore taken from the net metering bills from the electric utility and the separate meter- ing done for the solar PV system. Since the electric utility bills contain a statement about net electrical energy separately drawn from the grid and also given to the grid by the on-site solar PV system, a simple calculation using the monthly amounts of energy generated by the solar PV system yields the total monthly energy use.
Shortly after this first year of data collection, the building was closed because of the pandemic. Nevertheless, a full year of monthly data on energy use and energy production from February 2018 through January 2019 was recorded. A bar chart showing actual energy use for that initial year is given above and can be compared to the modeled energy use bar chart on the opposite page. The differences are attributable to variances in actual use compared to the modeled schedule of use during this academic program start-up period.
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kBtu/sq.ft.