Thus, every kWh produced by CCAT offsets less carbon than each kWh enbedded in the system, making the carbon payback about twice as long as the energy paybackĬurrent PG&E 1st tier, E1 shedule rate (as of 12/09) is $0.115/kWh. It is assumed the panels will produce this amount annually until the embedded energy is recouped.ĬCAT's electricity is from PG&E, and its mix is cleaner than the national average. PG&E provided the energy production of CCAT's panels from the last annual billing cycle (7/08-6/09). Since the panels were manufactured in the US and they comprise the bulk of the embedded energy, it is assumed that all embedded energy is from US 2007 grid electricity Furnaces were used throughout the process(not accounted for in embedded energy), which is more efficent, and thus, should compensate for the components likely made in China to make a reasonable estimate. This seems reasonable as the plastic is industrial. Steel - Market average, comprised of both recycled and virgin steel.Īll weather plastic - non category value used, which is higher than average. Panel Glass- Toughed glass value used as the panels must withstand elemental stress. The materials are based on these ICE values:Īluminum - Market average, comprised of both recycled and virgin aluminum. The quantities of construction materials were estimated by physical inspection when exact weights were unknown. The embedded energy data came from the Inventory of Carbon and Energy (created by Geoff Hammond and Craig Jones from the University of Bath, UK), execpt for the polycrystalline panels which came from a study that estimates the amount of energy per m^2. Justification of Assumptions Embedded Energy Follow this link (link being worked on) Media: Excel Workbook for our excel workbook download. The Excel sheet is mostly self explanatory and contains many justifications of assumptions as well as need to know notes on how it works. They will be creating a spreadsheet that will contain initial costs, efficiency, energy production, energy usage, and energy fed into the grid from the system. They will be answering questions about the energy input (embedded), energy output, efficiency, costs, and buyback time. CCAT is a demonstration house for appropriate technologies, it is part of their mission statement to record and document the technologies they implement to obtain pertinent data for everyone to view. Problem Definition: CCAT's team is responsible for analyzing the CCAT house's PV Solar System. The Campus Center for Appropriate Technology, a student run organization focusing on renewable, environmental and self- sustainable technology through a live-in demonstrational house and educational center on HSU campus. Because CCAT is an educational outlet for the community it was necessary to perform a full systems analysis of the PV. ![]() It has since been reconnected in 2008 and is still grid tied. ![]() This system ran for only a few years before the CCAT house was moved several hundred feet to the southwest to make room for the BSS building at HSU in 2005. In 2001 a new grid tied PV system of 8 ASE-300-DGF/17 modules of 300 Watts each. This system ran off the grid for 10 years generating power for the CCAT house along with a wind turbine and backup bio diesel generator. In May of 1991 CCAT installed a PV solar system.
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