High Performing Buildings - Summer 2012 - (Page 52)

FIGURE 2 PV Production for north and south roofs PV Production The PV production measured over the year was 71,118 kWh (242 million Btu) compared to an overall consumption of 9,824 kWh (33.5 million Btu). The resulting surplus is 90 kWh/m² · yr (28.5 kBtu/ft² · yr). ENERPOS has produced seven times its electrical consumption over the year, which means ENERPOS is net zero on an annual, monthly and daily basis. The PV system is oversized, but the design meets the goal of incorporating an architecturally integrated PV roof. FIGURE 3 The PV system is not part of the overall cost of the building. It is a financial agreement between the building owner, the University of La Reunion, and a manufacturer. The terms of the contract specify that the university rent its roofs for 15 years. The manufacturer installed the PV systems and supports all of the costs and risks (including typhoons and maintenance) during that period, but gets the benefits of the electricity fed into the grid (US$0.33/kWh). After 15 years, the university becomes the owner of the PV system. The west side of the patio is protected from solar radiation by wooden strips that lter the trade winds as well. The architect who designed the building wanted architectural homogeneity, with half the over-roof facing north and the other half facing south. Both slopes are 9°, which is not the best choice in terms of photovoltaic efficiency as the optimum position for PV panels on La Reunion is a north orientation with a slope of 21°. Comparing the PV yield of the north field with the south shows that the difference in orientation is not very important (about 10% more for Load curVe for March 1, 2011 March 2011 was the highest energy consumption month during the year of measurement (May 2010–April 2011). March 1 was the day of highest consumption. The load curve of this day is illustrated above. 52 HIGH PERFORMING BUILDINGS Summer 2012 © Jérôme Balleydier

Table of Contents for the Digital Edition of High Performing Buildings - Summer 2012

High Performing Buildings - Summer 2012
Commentary
Contents
High Tech High Chula Vista
Kiowa County Schools
Northwest Maritime Center
La Reunion’s ENERPOS
Wilfred Uytengsu Sr. Center
Products
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High Performing Buildings - Summer 2012