A wind tunnel for anemometer calibration in the range of 0.2–1.25 m/s

Pezzotti, Santiago; D'Iorio, Juan Ignacio; Nadal-Mora, Vicente; Pesarini, Alejandro J.

doi:10.1016/j.flowmeasinst.2011.04.006

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…The reliability of this sensor has been proven by direct comparison with a professional sensor with the aid of a wind tunnel [ 23 ]. The developed wind tunnel consisted of the following three main parts: a convergent diffuser, a test chamber and a divergent diffuser.…”

Section: Resultsmentioning

confidence: 99%

Design and Development of nEMoS, an All-in-One, Low-Cost, Web-Connected and 3D-Printed Device for Environmental Analysis

Salamone

Belussi

Danza

et al. 2015

Sensors

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The Indoor Environmental Quality (IEQ) refers to the quality of the environment in relation to the health and well-being of the occupants. It is a holistic concept, which considers several categories, each related to a specific environmental parameter. This article describes a low-cost and open-source hardware architecture able to detect the indoor variables necessary for the IEQ calculation as an alternative to the traditional hardware used for this purpose. The system consists of some sensors and an Arduino board. One of the key strengths of Arduino is the possibility it affords of loading the script into the board’s memory and letting it run without interfacing with computers, thus granting complete independence, portability and accuracy. Recent works have demonstrated that the cost of scientific equipment can be reduced by applying open-source principles to their design using a combination of the Arduino platform and a 3D printer. The evolution of the 3D printer has provided a new means of open design capable of accelerating self-directed development. The proposed nano Environmental Monitoring System (nEMoS) instrument is shown to have good reliability and it provides the foundation for a more critical approach to the use of professional sensors as well as for conceiving new scenarios and potential applications.

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Section: Resultsmentioning

confidence: 99%

Design and Development of nEMoS, an All-in-One, Low-Cost, Web-Connected and 3D-Printed Device for Environmental Analysis

Salamone

Belussi

Danza

et al. 2015

Sensors

View full text Add to dashboard Cite

show abstract

“…If a low-speed wind tunnel or nozzle is used as a calibration facility, relatively high flow velocities (e.g., greater than 4 m/s for air flows) in the calibration facility can be easily calculated from the difference between total and static pressures obtained with pressure tubes or wall taps on the facility, whereas for relatively low flow velocities (especially when velocity is less than 1.5 m/s) the calibration of hot-wire anemometers cannot be achieved using this conventional calibration rig since the pressure difference in flow is so small that the sensitivity and accuracy of pressure measurement instrumentation are decreased and make it hard to read the pressure difference accurately with a manometer, thus the measurements of airspeed from pressure difference are inaccurate [5,6,12,13]. Furthermore, air flows generated in the test section of classical wind tunnels at low fan speeds may be affected by pulsations; therefore, they are usually not steady and uniform enough to be used as measurement standards below approximately 1 m/s [4].…”

Section: Introductionmentioning

confidence: 99%

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

Zhou,

Zhang,

Tian

et al. 2024

Applied Sciences

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Aimed at addressing the difficult problems existing in extremely low speed calibration facilities for hot-wire anemometers, where calibration accuracy is often insufficient and vulnerable to the contamination from temperature and humidity discrepancies between the calibration environment and the application environment, a calibration rig with a velocity range from 0.10 m/s to 1.0 m/s, an air temperature range from ambient temperature to 60 °C, and a humidity range from 20%RH to 80%RH was designed, developed, and constructed. The overall layout arrangement and the mechanical structure of the facility are illustrated. The master control system, the motion control system, the temperature and humidity control system are designed, tested and adjusted. The adjustment results are demonstrated and discussed. The analysis of the results reveals that the maximum velocity control error is 0.000989 m/s, satisfying the design target of 0.003 m/s; the corresponding maximum relative error is 0.241%, which is less than the design target of 0.4%; the maximum temperature control error is 0.9 °C, meeting the design target accuracy of 1 °C; the maximum humidity control error is 2.9%RH, which is below the design target of 4%RH. When the facility is applied to the calibration of a hot-wire anemometer, the maximum error of the fitting curves in modified King’s law is 0.02236 m/s, while that in Van der Hegge Zijnen’s formula is 0.023217 m/s, both of which satisfy the design target accuracy of 0.03 m/s. The maximum relative errors of fitting curves using the two formulas are 5.214% and 8.527%, respectively. Analysis of calibration data reveals that the discrepancy in temperature and humidity between application site and calibration site may bring errors that can reach up to 1.2676% per unit relative humidity discrepancy, and 5.672% per degree Celsius of temperature deviation, respectively.

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“…Hence, anemometers used for observation or monitoring of indoor airflow must be calibrated with sufficient accuracy. The calibration of the anemometers is, in most cases, conducted by facilities owned by calibration laboratories or manufacturers [ 1 – 4 ]. However, it takes a long time to calibrate even one anemometer.…”

Section: Introductionmentioning

confidence: 99%

A Compact Wind Tunnel for Calibrating Anemometers Used for Indoor Airflow

Iwai

Kurihara

Takatsuji

et al. 2023

MAPAN

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In order to evaluate an indoor airflow, which may cause the spread of viruses, it is effective to measure the speed and direction of the airflow using several accurately evaluated anemometers. However, since calibration of anemometers is a time-consuming task, so the authors developed a compact wind tunnel that can evaluate the accuracy of anemometers in a short amount of time. The design concept and performance of the wind tunnel are described by several indices, including averaging time, settling time, spatial distribution, and blockage effect. These results demonstrate the capability of the wind tunnel to evaluate several anemometers in a short measurement time with sufficiently high precision.

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A wind tunnel for anemometer calibration in the range of 0.2–1.25 m/s

Cited by 10 publications

References 7 publications

Design and Development of nEMoS, an All-in-One, Low-Cost, Web-Connected and 3D-Printed Device for Environmental Analysis

Design and Development of nEMoS, an All-in-One, Low-Cost, Web-Connected and 3D-Printed Device for Environmental Analysis

A Calibration Facility for Hot-Wire Anemometers in Extremely Low Speed with Air Temperature and Humidity Variable and Controllable

A Compact Wind Tunnel for Calibrating Anemometers Used for Indoor Airflow

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