Barometric Pressure Sensors

Barometric pressure sensors (barometers) measure the air pressure. Air pressure and air temperature should be evaluated for an accurate wind site assessment, however, because this data could be obtained from nearby weather stations, they are not considered an essential part of a measuring system. Even so, barometers are worth consideration, taking into account the savings made on the expense of supply, analysis and incorporation of external data over the course of a measuring campaign (at least 12 months). We generally would recommend the inclusion of an air pressure sensor as part of a measuring system.

Impact of measurement errors on  AEP calculation

Air pressure as well as air temperature significantly affect the AEP (Annual Energy Production). Hence according to IEC 61400-12-1 air pressure has to be measured in a wind measurement campaign.

Wind power is linear proportional to air pressure. A measurement error of 1% in air pressure induces 1% error on AEP. The standard IEC 61400-12-1 specifies the relations where the sensitivity factor for air pressure in the energy calculation is c_B,i ≈ P_i / 1013 hPa.

Therefore IEC 61400-12-1 requires measuring air pressure and temperature.

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barometric pressure sensor AB 60

barometric pressure sensor AB 100

Barometric pressure sensor Vaisala PTB 110