anemometer Articles

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Measuring Offshore Wind Resources

by Renewable NRG Systems  (May 12, 2016)

To select the right offshore wind site, estimate the future energy output of a wind farm, and determine the best layout for the turbines, project developers must conduct wind resource assessment (WRA) campaigns on site. This is a critical phase of the successful development of wind farms. WRA campaigns on terrestrial sites have traditionally been ...

The C3—an alternative anemometer for resource assessment

Executive Summary. Second Wind Inc. is pleased to offer a new standard anemometer for resource assessment that incorporates industry proven geometry and features. The new three-cup anemometer, the Second Wind Model C3, is physically similar to a popular anemometer designed by Maximum, Inc. and used in the wind industry for more than 30 years. ...

Minimizing flow distortion errors in a sonic anemometer

by Applied Technologies, Inc. (ATI)  (Mar. 20, 1990)

This paper describes a simple approach to minimizing probe-induced flow distortion errors in a three-axis sonic anemometer. By separating the three axes, mutual interference between the transducers and supports in the three arrays is reduced. Only a transducer shadow correction determined from wind tunnel tests is needed to obtain measurements ...

Why Does the Non-Orthogonal Sonic Anemometer Underestimate

by Applied Technologies, Inc. (ATI)  (May 16, 2014)

The performance of non-orthogonal sonic anemometers has been the subject of much discussion in recent years.  It followed findings that they underestimated vertical winds and vertical heat fluxes by 10-15%.  For agricultural and forestry scientists who depended on them for their large-scale energy balance studies this was a bad surprise. ...

Comparisons of models with data: effects of averaging time as indicated by sonic anemometer measurements

by Inderscience Publishers  (Sep. 17, 2009)

For continuous sources, plots of predicted against observed gas concentrations often display considerable scatter. These differences are apparent even when the averaging times for the models and data match. Possible sources of error in the observations are shifts in direction of the mean wind or disturbance by intermediate- and large-scale eddies. ...

Flow measurement technology comparison: GA5000 Vs Hot Wire Anemometer

by Geotech  (Jul. 22, 2014)

A typical landfill or contaminated land site under investigation will comprise of a suitable number of gas monitoring wells, with a planned series of monitoring visits.  The monitoring will include gas flow measurements, which together with methane and carbon dioxide concentrations will be used to calculate gas screening values (GSV) and ...

Sonic Thermometry

by Applied Technologies, Inc. (ATI)  (Sep. 1, 2012)

Sonic anemometers have had extensive use in the scientific community. These instruments are used to measure atmospheric parameters that most rotating instruments cannot. Wind speed and wind direction or individual axes of wind velocity are most commonly measured. Along with these measurements, another parameter can be extracted from the sonic ...

Verification of wind energy related measurements with a SODAR system

by Atmospheric Systems Corporation (ASC)  (Sep. 14, 2013)

Abstract Complex terrain and growing wind energy converters (WEC) in wind parks generate increasing interest in determining wind profiles and turbulence besides the general forecast of annual energy production. Increasing hub heights and growing rotor diameters of advanced WEC make SODAR systems a valuable alternative to meteorological towers. ...

Canarina DISPER software · anaerobic digestion · commands 28

by Canarina Environmental Software  (Dec. 14, 2011)

The necessary data in the Meteorology command is:   Pasquill stability): Classification scheme that describes the degree of atmospheric turbulence. Categories range from extremely unstable (A=1) to extremely stable (F=6). Unstable conditions ...

Effects of averaging time on predicted gas concentrations

by Inderscience Publishers  (Jan. 26, 2004)

The potential consequences of a particular gaseous emission usually relate to a specific averaging time. However, the averaging time associated with gas monitoring data in the region of a discharge may differ from the averaging time implicit in a model employed to predict the concentration resulting from that emission. Tables of factors exist for ...

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