10.0 System Monitoring

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production depends on a site's actual wind resources and conditions, and varies with wind turbine condition, altitude, temperature, topography and the proximity of other structures. It should be noted that most sites experience seasonal variations in wind resources and, therefore, in energy production.

10.5Wind Energy Data Sheet

The wind energy data sheet (see Appendix G) can assist evaluating AOC wind systems. It can be used whenever both a dedicated non-ratcheted kWh meter and a recording anemometer have been installed.

NOTE: AOC bases all published output projections on monthly averages. Data should be sampled at small, regular intervals throughout the month, preferably at the same time each day, e.g. every 48 hours at 8:00 a.m. For best results, sample intervals should not exceed four days; daily sampling provides greater accuracy. For comparison with monthly data projections, readings should be taken on the same day each month. Energy output varies with air density and tends to be lower at high temperatures and high altitudes than at low temperatures and low altitudes. Monthly projections are based on 15ºC (59ºF) at sea level using a Rayleigh distribution. If the average wind speed is made up of a combination of strong and weak winds, the energy output will typically be greater than if the average is composed entirely of moderate

winds. This is due to the relationship of wind speed to energy production.

NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer on page v of this document.

DOC012R02

AOC 15/50 User Manual

Nov 2001

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AOC 15 user manual Wind Energy Data Sheet