Designing and-installation-of-lowcost-optimized-wind-monitoring-system-2169-0316.1000153

Designing and Installation of Low-cost Optimized Wind Monitoring System
Saurav Gupta* and Gagandeep Kaur
Department of Electrical & Instrumentation Engineering, Thapar University, Patiala, India
*Corresponding author: Saurav Gupta, Department of Electrical & Instrumentation Engineering, Thapar University, Patiala, India, Tel: 911752393021; E-mail:
Sauravg969@gmail.com
Received date: July 11, 2014; Accepted date: February 25, 2015; Published date: February 28, 2015
Copyright: © 2015 Gupta S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted
use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
Measurement of wind parameters is a necessity for chemicals industry. A big disaster can be prevented from
happening if accurate wind monitoring system is installed in the industry. It is not easy to buy and install a wind
monitoring system for every chemical industry from a vendor since its price is high and design varies from company
to company and process to process. To make life easier, better and safer, a low cost optimized wind monitoring
system has been designed and installed here with available resources. This project will help in measuring wind
speed, wind direction and ambient air temperature to take protective measure right before the havoc, so that it can
be prevented.
Keywords: Anemometer; Wind vane; RTD; Gill shield; Reference
point
Introduction
Wind monitoring system has become a necessity of daily life in
industries, especially in a chemical industry where there is always a
danger of fire, or some poisonous gas leakage into the atmosphere. At
that time safety of personnel is as important as the value of material
leaked.
With emerging chemical industries risk has increased many folds,
and due to high cost of wind monitoring system, many of small
industrialists prefer to rely upon big industries for weather data,
though it changes from place to place. Sensors have become one of the
essential parts of daily life as in mobiles, televisions, laptops etc. It also
forms the major and important part of process industries for
automation of valves. These are used in wind monitoring system for
measurement of wind speed, wind direction and its temperature.
A device consist of various sensors, that could be taken out and
used for various other purpose when a device can no longer be
repaired and perform its requisite function. This will not only save
money but will help engineer to gain knowledge of the components,
and here it will save many lives as well [1].
Type of Instruments used
Wind monitoring system here consists of three basic parts 4-cup
wind anemometer (wind speed), Light weight wind vane (wind
direction) and temperature probe (ambient air temperature).
Four cup wind anemometer
Four cup anemometer (Figure 3) is used for measuring the near-
horizontal wind speed. It consists of light weight but rugged 4- plastic
cups (taken from a plastic ball) mounted on a vertical shaft, with the
help of aluminum rods placed at right angles (Figure 1). Vertical shaft
is mounted on low friction bearings. One of the cups always faces the
oncoming wind, which with the help of specifically designed
aerodynamic cups convert wind force to torque that in turn rotates the
shaft. The other end of the shaft rotates a round magnet [2]. A reed
switch (transducer) placed near the magnet makes the contact closure
twice per revolution of the rotor. Thus reed switch helps in converting
rotational motion to electrical pulses. A cover rotates with the rotor at
top to prevent the rotor from ill effects of dust and rain (Figure 2).
Figure 1: Assembling of 4 Cup for 4 Cup anemometer
Figure 2: Scrap Rotor with internal reed switch assembly
Industrial Engineering &
Management Gupta and Kaur, Ind Eng Manage 2015, 4:1
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Research Article Open Access
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ISSN:2169-0316 IEM an open access journal
Volume 4 • Issue 1 • 1000153

Figure 3: 4 Cup Anemometer
This anemometer is highly responsive and has a low threshold for its
starting (due to good quality of scrap rotor). A train of square wave
whose frequency is directly proportional to the wind speed is obtained
as output, which is further processed by frequency to current
converter, and this signal is through wires to data loggers (Table 1).
S.no Various parts Material of construction
1 Cups Light weight rugged plastic cups
2 Horizontal rods for cups Aluminum
3 Vertical shaft Copper shaft
4 Shaft bearings Teflon
5 Sensor 4 cup rotor with magnet and reed switch
6 Cup diameter 60 mm
7 Power supply 5 Volt
8 Accuracy 2% at full scale
9 Threshold 0.3 m/s
Table 1: Wind Cup Anemometers Specifications
Wind vane
The wind vane (Figure 4) is used is for measuring wind direction. It
consists of a light weight fin at its end made from light weight material
like aluminum attached at one end of an aluminum rod and the other
end is counter balanced by bob. This aluminum rod is balanced and
connected to a vertical shaft that in turn is attached to transducer. The
transducer here is a 360 degree turn precision potentiometer mounted
on bearings, which provides negligible resistance to rotation. Here also
transducer and bearings are protected by use of cover which rotates
with vane.
Working of wind vane: The vane here constantly seeks the
equilibrium position by aligning itself in the direction such that bob
attached to it points to the direction of ongoing wind. Here
potentiometer is 10 kΩ pot that gives an output in form of electrical
signal relative to the position of vane (reference point, here its True
north). This electrical signal is transmitted to data logger that converts
it into the readable form as; data logger gives a known voltage across
the whole pot element and measure the voltage where the wiper arm
contacts a conductive wire element. The ratio of two helps in
determine the actual wind direction [3].
Every potentiometer has a dead band, which is an open area in
potentiometer conductive element where readings may fluctuate
drastically. It happens when a rotation from 0 to 360 degree is made.
Here dead band is 5 degree far better than other instruments. Here 360
degree is divided in such a way that we get output of 0-1 Volt for 0-360
degree rotation.
Figure 4: Wind vane
This design is reliable, accurate, low maintenance required and has a
good response (Table 2).
S.no Various parts Material of construction / specification
1 Sensor Potentiometer 10 kΩ
2 Range 0° to 360°
3 Accuracy 2°
4 Operating temperature 0°C to 50°C
5 output Resistance variation
6 Fin aluminum
7 bob steel
Table 2: Wind Vane Specifications
Temperature probe
Platinum Resistance temperature detector (PRTD 100) is used as
sensor, which has a resistance of 100 Ω at 0°C. Connections of wiring
is done to the 3 wire- RTD (Figure 5), which provides internal auto-
compensation to temperature changes. The resistance change of RTD
due to ambient air change is measured with the help of digital
controller by use of 230 V ac. This controller is capable of showing
both resistance as well as temperature in its display. The electronics
components in it provide conditioning that such that output varies
from 0 to 5V for temperature change of 0 to 50°C. RTD bit is protected
from direct sun rays of light with help of can with a holes in it and
coated black inside and reflecting material or white painted at outside.
We may also use professional gill shield from market, but it will be
costly (Table 3).
Citation: Gupta S and Kaur G (2015) Designing and Installation of Low-cost Optimized Wind Monitoring System. Ind Eng Manage 4: 153. doi:
10.4172/2169-0316.1000153
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Volume 4 • Issue 1 • 1000153

Calculation
Wind speed
The anemometer shaft is connected to the reed switch, which makes
and breaks connections to generate a square pulse; its frequency is
calculated by the frequency to current converter (Figure 7).
Basic calculations are shown here, that will assist how internal
software of data logger performs the calculations.
Revolution Per Minute (RPM) is obtained with help of frequency to
current converter (Figure 7), and radius of anemometer arms will help
to obtain the speed as: (Table 4)
Circumference, C = 2πr in units of cm
K= correction constant
Distance in km/hr = K x C x RPM x 60 x (1/100000 km/cm) in units
of km/hr
S.no Various parts Material of construction / specification
1 Sensor RTD ( PT 100)
2 Range 0°C to 50°C
3 Accuracy < 0.5°C
4 Resolution 0.1°C
5 Radiation shield Non aspirated radiation shield Can
6 Output 0 V to 5 V for 0°C to 50°C
7 Power supply 230 V ac
Table 3: Temperature Probe Specifications.
Figure 5: Resistance Temperature detectors
S.no
Frequency (RPM /
60)
Current
(mA)
Speed( km/ hr)
1 0 4 0
2 27 8 26.3
3 54 12 52.7
4 81 16 78.9
5 108 20 105
Table 4: Output Table for Wind Speed
Figure 6: Making rough compass by cardboard
Figure 7: Pepperl Fuchs KFD-FSU-ExID Frequency to Current
converter
Wind direction
The wind vane shaft is connected to transducer (10 kΩ
potentiometer) for measuring the accurate position of vane with
respect to reference point, thus concluding the accurate direction of
wind. The potentiometer used here is 360° type, with no rotational stop
but have a dead band of 5° [4].
The wind vane is connected to the wiper of potentiometer, whose
position with respect to reference point gives wind direction. The ends
of potentiometer is fed to 0V and +5V DC, and then the wiper voltage
varies as 0 to +5V for a difference of 0° to 360° when compared with
reference.
The relation between wiper output voltage and indicated wind
direction is as follow:
Wind direction (in degree from reference point) = (Actual output
voltage / applied voltage) * 360°
Wind direction calibration: In order to calibrate the vane, a circle is
cut from the card board and a hole is punched inside it, and markings
are drawn as per the directional compass (Figure 6). Good quality
compass helps in making north as a Reference point, means at this
position value of potentiometer reading should be zero. This is done
manually by movement of vane in north direction and adjusting the
potentiometer such that reading is zero. Then insert the card board
across vane shaft such that north of original compass coincides the
cardboard one, and move the vane manually in east, south and then
west .Note the reading for each and conclude the result (Table 5).
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S.no Angle in degree Direction(N-North, S-South, E-East W-West) Calculated output Voltage
(volts)
Actual output Voltage
(volts)
10N00
.
2
2 45 NE 0.625 0.65
3 90 E 1.25 1.24
4 135 SE 1.875 1.87
4 225 SW 3.125 3.11
5 270 W 3.75 3.77
6 315 NW 4.375 4.38
7 355 4.93 1.8
8 405 NE 0.625 0.61
Table 5: Relation between Angle and Output Voltage
Temperature probe
Ambient temperature is measured with the RTD. RTD is connected
to the indicator that holds internally relation between resistance
measured and temperature in °C.
Calibration of RTD
Here Whether the RTD is working correctly is checked by taking it
into the three different process liquid where RTD was used and
comparing the resistance.
Else one may use Ice Bath Calibration, Fluid bath calibration etc.
Display unit used is from Intelligent Sensor Meter (e.g. Figures 8
and 9). Here we select parameters input type as Pt, alarms as per
choice, upper and lower limit 0 and 50 respectively, set point as 29.
Figure 8: Electrical connection drawing
Figure 9: Front Panel of Intelligent sensor meter
Result and Discussion
The proposed system here is a low cost, well calibrated, accurate,
and optimized system. It utilizes scrap items like rotor of an old
machine, plastic cups, aluminum rods, and other low cost components
such as Controller (Intelligent system meter) as display unit, RTD bit.
The result obtained are accurate as per the cost and this proposed
project can be installed in any industry where speed and direction are
major factor that needs to be monitored to prevent disaster from
happening.
The readings shown (Figures 9 and 12) are compared with the
previously installed wind monitoring system by Sunshine enterprises.
We here notice that cost factor has come many folds without
comprising with the accuracy [5].
Cost Comparison
There was a big difference between the costs it costs us almost 18000
rupees, in comparison to 1.5 lakhs (Table 6).
S.No Parts Price
1 Cups 30
2 Rods 20
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3 Display 4000
4 F to I 8000
5 Potentiometer 2500
6 adapter 80
7 wiring 600
Table 6: The cost of some components used in designing of project
Conclusions
• The focus of this paper is in designing a low cost and yet optimized
wind monitoring system. The most important conclusion that is
extracted from this project are:
• It is cost effective as it reduces the cost many folds as compared to
the cost if we buy whole accessory from one vendor [6].
• Small industries that do not feel necessary, the use of wind
monitoring system, and were dependent on others, can have it at
low cost.
• Since it utilizes scrap material and other self-made components it
helps engineer to develop and expand their thought process to
achieve the desired result that too in confined limits.
• Here many components as controller unit, RTD were used from
outside vendor; one learns to use money efficiently to have the
desired result at minimum cost [7].
• Since we had all it calibrated and tested manually once, these
controller are then attached to transmitter which correspondingly
sends data to DCS, and thorough records can be maintained
similar to that , if we had purchased it all from vendor [8].
• Since it is a kind of assembling, we here pays no extra cost to
vendor for the features that we not require, as here we do not want
humidity measurement, so we did not have it that saved us money.
• Accuracy, reliability are well maintained in this process as verified
from the data [9].
References
1. Marc S, Dennis E, Dave B, Ken C, Rich S, Jack K (1997) Wind resource
assessment handbook. AWS scientific Inc.
2. Fouad ST, Ayad MS (2012) Data Acquisition System for Wind Speed,
Direction and Temperature Measurements. Journal of engineering 18:
1229-1241.
3. Anderson DC, Whale J, Livingston PO (2008) Rooftop Wind Resource
Assessment using a Three-Dimensional Ultrasonic Anemometer..
4. William DL (2009) Effects of Tower Shadowing on Anemometer Data.
11th Americas Conference on Wind Engineering, San Juan, PR, USA.
5. Hughes PA (1986) Validation of a model for thermal emission, Durham
theses, Durham University.
6. Raymond SH (2003) Wind speed measurement and use of cup
anemometry. Renewable Energy Systems Ltd.
7. http://www.instreng.com/2-wires-3-wires-or-4-wires-rtd-resistance-
temperature-detector/
8. http://www.sanyoutech.com/UploadProductPic/20099171524682683.pdf
9. Annie EEJ, Paramasivam S (2013) Real Time Temperature Measurement
for the Thermal protection of Switched Reluctance Machine.
International Journal of Engineering & Technology 5: 2983-2987.
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