Climate information


Over the years, Numerical Logics has been involved in a number of climate data related project, most notably:

To tap into Numerical Logics' internationally recognized expertise in climate data analysis please contact:

Canadian Weather for Energy Calculations (CWEC) weather files

Client: National Research Council of Canada (Institute for Research in Construction), Environment Canada, and others.
More info & download: CWEC files are 'typical year' weather files containing hourly data such as solar radiation, dry bulb temperature, dew point temperature, wind speed, etc. They are obtained by concatenating twelve Typical Meteorological Months selected from a database of, in most cases, 30 years of data. The months are chosen based on statistical criteria (representing mostly solar and dry bulb temperature). Numerical Logics' web site provides a description of the format of the files and a list of available locations (with a map showing available sites). CWEC files can be obtained from Environment Canada. CWEC files are used both for solar energy simulation and for building performance modelling. For example they can be downloaded in a formats compatible with HOT3000 and for EnergyPlus.
Our work: Numerical Logics created a number of CWEC files from long-term weather records provided by Environment Canada. Numerical Logics can create additional CWEC files for sites not in the list above. To have new CWEC files processed, please contact:

Canadian Renewable Energy Wind and Solar Resource CD (CERES)

Client: Environment Canada.
More info: CERES contains monthly values of solar radiation on the horizontal and on surfaces of various orientations for over 150 Canadian locations. The CD-ROM is available from Environment Canada.
Our work: Numerical Logics calculated solar radiation incident on surfaces of various orientations for all sites in CERES.

International Weather for Energy Calculations (IWEC)

Client: American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) - Research Project 1015.
More info: IWEC files are “typical” weather data in ASCII format, suitable for use with building energy simulation programs, for 227 locations outside the USA and Canada. The files are derived from up to 18 years of DATSAV3 hourly weather data originally archived at the National Climatic Data Center (NCDC). The weather data are supplemented by solar radiation estimated on an hourly basis from earth-sun geometry and hourly weather elements, particularly cloud amount information.
The IWEC CD-ROM is available from the ASHRAE store. IWEC data were also used to create climate files for the EnergyPlus program.
Our work: Numerical Logics was the principal investigator for Research Project 1015.

Climatic design conditions for the ASHRAE Handbook of Fundamentals

Client: American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) - Research Project 1273.
More info: ASHRAE Research project 1273-RP recalculated and expanded the tables of climatic design conditions in the 2005 ASHRAE Handbook of Fundamentals. These tables provide values of dry bulb, wet bulb and dew point temperature, enthalpy, and wind speed at various frequencies of occurrence over annual and monthly periods; and for some of these, mean coincident values of other variables of interest. A companion CD-ROM, the ASHRAE Weather Data Viewer (WDView 3.0) gives full access to the frequency information used to compile the tables of climatic design conditions. The ASHRAE Handbook of Fundamental and WDView 3.0 are available from the ASHRAE store.
Numerical Logics can assist you in the calculation climatic design conditions others than those listed in the ASHRAE Handbook (for example to calculate the 5% design temperatures, rather than the 1% or 2% values listed in the Handbook). For more information contact:
Our work: Numerical Logics was the co-investigator for Research Project 1273, with Levelton Consultants of Richmond, BC. as the principal investigator.

Climate database of the RETScreen program

Client: Natural Resources Canada.
More info: The RETScreen program incorporates an International Online Climate Database with ground-based observation averages for over 4,700 sites around the world. It includes monthly values of solar radiation, dry bulb temperature, wind speed, etc.
Our work: Numerical Logics participated in the compilation of some of the elements of the database.

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