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�vf� . <br /> r EXHIBIT G - INDIAN RIVER COUNTY PHASE 2 <br /> TECHNICAL ENERGY AUDIT <br /> it BY FPL ENERGY SERVICES,, INC. <br /> NOVEMBER 2009 <br /> For Indian River County, the number of days is estimated as 10 per year. This is based <br /> on data from the US weather station at Melbourne and West Palm Beach, as shown <br /> below. <br /> NumberLocation of Days at, or <br /> below, Degrees <br /> Melbourne 15 Oct— Mar <br /> West Palm Beach 3 Oct— Mar <br /> Weather station at Vero beach <br /> Estimated Avg for 10 has insufficient data. Average is <br /> Vero Beach based on the WPB and Melb data <br /> and relative distance <br /> As a result, some sort of freeze protection is required. <br /> For an open system, the standard freeze protection device is the "freeze protection <br /> valve." The protection is provided by the valve opening whenever the surrounding air <br /> temperature drops to 40 degrees F (plus or minus) and allowing 1 — 2 gallons per <br /> minute of water to flow through/out of the system. This equates to an estimated <br /> 12,000 gallons per year being released (10 days per year x 10 hours per day x 60 <br /> minutes per hour x 2 gallons per minute). <br /> For a closed system, the freeze protection is provided by utilizing a heat exchanger with <br /> propylene glycol as the working fluid. This type of system eliminates the water waste of <br /> an open system, but is rarely use in Florida due to the climate. <br /> Regardless of the type of system, the savings were calculated by determining the <br /> amount of hot water generated by the solar system versus the total amount of hot <br /> water required (solar fraction). Then, comparing it to the existing system's energy use. <br /> The solar system was modeled on F-Chart software (by Klein and Beckman, vers <br /> 6.58W). With this software, the following inputs are required: <br /> • type of system <br /> • number and type of panels <br /> • panel performance data <br /> • fluid type and properties <br /> • heat exchanger data, if used <br /> • storage tank data, if used <br /> • weather data <br /> • angle of panels <br /> • hot water load in gallons <br /> • nominal water temperatures, inlet and outlet for system <br /> Proprietary& Confidential 5 Modeling <br /> FPL, <br />