New TMY Weather Data

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New TMY Weather Data Larry Palmiter and Ben
Larson August 4, 2008 Ecotope Inc.
Presented at Regional Technical Forum Portland,
Oregon, August 5, 2008
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TMY Datasets

• The National Renewable Energy Laboratory (NREL)
  releases Typical Meteorological Year (TMY)
  weather data every 15 years. The latest dataset,
  TMY3, was released in May 2008
• The TMY datasets are
• TMY1 1952-1975 234 Sites 22 NW
  Sites
• TMY2 1961-1990 239 Sites 25 NW
  Sites
• TMY3 1991-2005 1020 Sites 77 NW
  Sites
• NW sites limited to WA, OR, ID, and MT

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Northwest TMY3 Data

• There are two important features of the Northwest
  TMY3 data
• There is a large increase in the number of
  stations giving much better geographical
  coverage.
• The TMY3 data show reduced heating degree days
  and actual heating loads in nearly all Northwest
  locations. The cooling degree days and loads
  show less change.

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Northwest TMY3 Sites
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