2. The AIUI] Journal of Science and Engineering (AJSE)
August 2015 I Volume 14 Number 1
A.ISE Editorial Board
Chief Editor
Dr. Curmen Z. Luntagnu
Vice Chancellor, AIUB
Associate Editors
Prof. Dr. Tufazzal Ilossain
Vice President, Academics, AIUB
Prof. Dr. Suiful Islam
Pro-Vice Clrancellor, Primeasia University
Members
Prof Dr. A. B. M. Siddique llossain
Dean. Facuhy of Engineering, AIUB
Prof M. A. Quuiyum
Registrar. AlUu
Prof. Dr. Md. Rufiqul Islum
Computer Science and Engineering Discipline, Khulna University
Special Editorial Assistant
:|ilr. Rinku Bosak
Assistant Professor and Head (Graduate Program), Department of EEE, AIUB
Edirorial Policv
I- Research papers to be published in thisjournal will be processed through a blind review system by a
panel of expert reviewers.
l- The responsibilities for opinions, studies and other contributions rest entirely on the respective
author(s). Publication does not necessarily constitute efdorsement of the same by AIUB.
-i- llanuscript submitted for publication should be the original work of the author(s). If a paper contains
material(s) reproduced fiom other sources, it must be acknowledged or flecessary permission should
be submined along with the paper.
-[. Coplright of the paper published in this journal will be reserved by AIt jB.
-;- The journal is published once a year in English in the month of August.
AJSE is publislied in on behalf of the Faculty of Engineering ar-rd Faculty of
Science and Information Technology, American International University-
Bangladesh (AIUB) by the Office of Research and Publications (ORP)

3. The AIUB Journal of Science and
August 2015 Volume 14 Number
Papers
Bngineering (AJSE)
1 ISSN 1608 -3679
Pages
Design and Evaluation of a compact ultra wide Band rextile Antenna for Wearable Body
-{rea Applications
Shuhriar l{esqtr Shelmb, Sheiteen Hassun and Furhaclur Arifin
Effects of Active Region Thickness on the performance characteristics
Based 420 nm MQW Blue Violet Laser
Aniqo Tahsin, Tinni Rani Paul, Shakhila Afrin and Rinku Bcrsok
of InGaN
Performance Evaluation of Energy Detection based Cooperative Spectrum Sensing for
Cognitive Radio
Ikrant llyas, Niger Fatema and Md. Abdar Rahman
Design and Performance Analysis of Nano Microstrip Rectangular Patch Antenna at
0.25 Tlfz
Mehnaj Mahbuba and NaJiz Ahmed Chisty
Performance Analysis of MIMO Antennas Based on Compact Corner Notched printed
Rectangular Monopole Antenna for UWB Applications
Mohammatl Tbreq und Zeenat Afroze
Design of A Novel, Low-Profile, Elliptical patch Super wide Band MIMO Antenna and
Perfonnance Analysis for UWB Applications
Mtl. Ashif Isktm Oni snd M. Tanseer Ali
Speed Control for SPWM-VSI Fed Induction Motor Tdking Core Loss and Stray Load
Losses into Account
Md. Rirtfi Huzari, llohsntnwd Abdul Munnan, Toshiaki Murato and Junji ramuro
Design and Simulation of a Dual-stage DC to DC Boost Converter Driven Micro Grid'lie Inverter
Zuber llassn Mshmud und Md. Kamrul Llussan
Speed Control of Separately Excited DC Motor with Efficiency Maximization propensity
sumaiyu umme Honi, Mcl. Kamrul Husson, Mcl, Rifat Hazari and Mohummsd Abtlttl
Mqnnun
Measurement of Content Distribution in the Internet
Md Husib Noor, Miftah Al Karim and Saiful Islom Khsn
Crystallographic Orientation-dependent Optical Properties of InGaAs/GaAs euantum Well
Architecture by 4x4 Hamiltonian Matrix
S.M. Tasmeeh Altsan, Mahmoodal Islom and Sourav Roy
Performance Analysis of a Linearized power Amplifier with X-parameter Model
Nilinru Rohman and M. Tunseer Ali
l5
23
27
37
43
53
6l
7l
89
97

4. performance Improvement of Power System Network by Placing unified Power Flow
107
Controller at Appropriate Location
Shameem Ahmad, Saad Mekhilef, Fatli M. Albalsh and Shuvru Suha
ZigBee: Simulation and Investigation of Star and Mesh Topology by
Transrnission Bands
Md. Mamunttr Rttshld untl Retltwon Faiz
using different
ll5
varying Sample-width to Realize Area-Efficient F'PCA Realization of Sobel-Fleldman
123
Edge Detector
Kttzi Ahnted Asif Fuud and Shahriyar ll{asud Rizvi
Impact of Urban canyon on the Micro climate: A study through ENVI-met Model in the
Context of Dhanmondi, Dhaka 129
Sadul llusun Turiq, Syma Haque Trishs und Zurrin Tasnim
Creating New Eco-Cities for Sustainable Urban Devefopment 137
Shurmina lloque and Tabassum Zarirt
Bring Back Nature in the Post Mining Landscape of the west Rand, Johannesburg 143
Md Suriful Islam, Tabassum Zarin antl Shsrmina Haque
Creating Connectivity in Urban Renewal Places: The Case of Central Footscray l5l
Hqsnui l{ara Khondker, Mohantmetl Azizut Mohith and Ashik Vaskor Munnun
From ,Urban Space' to ,Urban Place': The case of Gulshan South Park, Dhaka,
Ilangladesh 163
Md"Sariful Islam, Suclipta Barua, M. Arefeen lbrahim and Diltuha Fredous Shuvnr
An Efficient DNA Sequence Compression Method Based on Approximate Rqpeats and
Reverse Complements 177
Md. Rafiqut islam, MtL Inzsmam+tl-Ilossain and Kislrcrc Kumar Pql
OTR: A Transparent D4tabase Approach for using Ontology in Information Systems 185
Bttyzicl Ashik,'Mtt. Asif utklirt, Tanmoy Mundut un(t Khuled Md Tuhitlul Hossain
X-Rays and other Associated Techniques in ldentising organic compounds for the
Production of Synthetic Graphite 195
Rttttthtt Jania orttl Tufazzul llossuin
Non-Newtonian Casson Fluid Heat and Mass Transfer Flow and Viscous Dissipation with
a Binary Chemical Reaction 201
Kh. Abttul Muleque and Protlip Kumur Ghose
Modification of Ahmed Car Body for Reducing Drag 215
Abul Kukm Aztul, Molrcmmad Arif Hossainancl A' K' M' Sudrul Islam

5. The AIUB Journal of Science and Engineering (AJSE). Vol. I 4, No. l. August 20 l5
Impact of Urban Canyon on
ENVI-met Model in the
the Micro Climate: A study through
Context of Dhanmondi, Dhaka
2. Objective of the Study
The objectives of the study are as follows
1. To understand the maximum impact of unban
canyon on the microclimate at a certain depth
from it.
2. To understand the impact of urban canyon on
the secondary roads
3. To investigate the effect of the spatial
variables on the air temperature (T), reiative
humidity (Rh), mean radiant temperature
(Tmrr) and wind velocity (V) in the
surrounding areas of this urban canyon by
field survey and simulation software.
3. Research Methodology
A linear segment of the Satmasjid road has been
randomly selected on the basis of the typical character
of the urban canyon with porosity and variations of
height in the urban fabric. The lingth of the urban
gallon for study area was determined according to
1:10 width-length ratio, where the width was 30m and
the length was taken for 400m from a node to another
node. The study also investigates the effect of the
spatial variables like road width, vegetal density,
boundary walls, variation in building heights and large
play ground on the temperature (T), relaiive humidity
(Rh), mean radiant temperature (Tmrt) and wind
velocity (V) in the surrounding areas of this urban
canyon by using simulation software ENVI_met ver.
3.1 BETA 5. Five points have been selected at a
distance from the urban canyon to validate the
simulation data and compare among them. These
points are identified as ,.Study
zones". The field
survey and simulation date has been done in the
month of August when pick air temperature can rise
up to 330 C during dayrime. the predicteJ data of Air
temperature (T), Relative humidity (Rh), Mean radiant
temperature (Tmrt) and Wind velocity (V) from the
simulation has been compared on thi basis of five
"Study zone" in four time segments from l0 A.M. to 4
P.M. The data regarding these five ,,Study
zones,,
shows the impact of urban canyon on the micro_
climate of the surrounding area.
Saiful Hasan Tariq, Syma Haque Trisha and zarrinTasnim
Abstroct- Dhanmondi is one of the prime residential areas
of Dhaka City characterized by diverse road pattern with
primary, secondary and tertiary arteries, open spaces and
variation in porosity in urban fabric. Satmasjid road is the
prirnary road that runs through the Dhanmondi Residential
area and retains the character of the urban canyon of 30m_
40m width and 20m-40m enclosure on both sides. There are
vegetal canopy on road islands, robust open spaces and lakes
alongside. The paper is based on the study conducted to
understar.rd the impact of urban canyon on the micro-climate
ofthe, surrounding area through a field survey along with the
ENVI-met simulation model of the study area.
Key,words: Urban Canyon, Dhanmondi R/A, Microclimate,
ENVI-met model
1. Introduction
Dhanmondi is one of the well designed residential
areas of Dhaka, the Capital of Bangladesh. The area
was planned and developed in the early fifties with
large plots, wide roads and sound natural
environment. Though mostly residential, over the
years several commercial developments took place
alongside the main vehicular acceis roads. Satmasjid
road is the primary road that runs through ihe
Dhanmondi residential area and retains the character
of the urban canyon of 30m-40m width, 20m_40m
high enclosure in both sides, having vegetai canopy on
road_islands, robust open spaces and iakes alongsiae
it. However this road creates an urban corridor. The
core objective of the study is to understand the impact
of urban canyon on the micro climate of Dhanmondi
area. As a part of the study a field survey has been
done on a bright sunny day having the mlasurement
of air temperature, relative humidity and wind velocity
at several points in the urban canyon.
These data was also taken at a certain depth from it to
understand the micro climate due to the urban canyon
and porosity of the urban fabric. The study ilso
investigates the effect of the spatial variables on the
temperature (T), relative humidity (Rh), mean radiant
temperature (Tmrt) and wind velocity (V) in the
surrounding areas ofthis urban canyon by field survey
and simulation using ENVI-met software.
Saiful Hasan Tariq is a Lecturer in Department of Architecture,
American International University-Baniladesh (AIUB). Email:
tariq@aiub.edu, cell: 0 191235661 I
Syma Haque Trisha is a Lecturer in Department of Architecture,
Bangladesh
.University of Engineering a.nd Technology (BUET).
Emai I : symah aq ue@grnai l. com, cell: 0 I 67 49 62400
Zarrin Tasnim is an Arclritect working in J.A. Architects ltd.
Email: Izarrin2T@gmail.com, cell: 01694t8044

6. - Tariq, Trisha and Tasnim: Impact of Urban canyon on the micro climate: A study through ENVI-met model
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Diagram 01: Research Mapping
4. Field Investigation
The month of August was selected for the
investigation. Generally in this month the pick air
temperature can rise up to 330 C during daytime. The
field investigation was done in the urban canyon and
at a distance from it, i.e. in the secondary roads
connected with it. Field data of temperature (T) and
relative humidity (Rh) was measured in several points
from I I a.m. to 12 p.m. on 26th August in the selected
portion of the urban canyon [fig l]. Average Wind
velocity (V) was measured 1.5 m/s at lOm level. This
value is taken as the average wind velocity (V) in this
portion of urban canyon because at road level it was
inconsistent due to the air turbulences created by the
vehicular movement. As the size of the ponion of
urban canyon was determined according to l:10
width-length ratio, the length of the study area in
urban canyon was taken 400m where the width was
30m. Field data was also taken at about 120m distance
from the urban canyon to understand its impact on the
micro-climate of the surrounding area. From I I a.m.
to 12 p.m. average air temperature was found around
33.50 C and average Relative humidity (Rh) was 62%.
From the field data it has been observed that the air
temperature is 10 C -20 C higher in the secondary
roads at a distance from the urban canyon. Humidity
level varied in different points, e.g. spaces below the
vegetal canopy shows higher humidity level than the
spaces exposed to direct solar exposure.
Fig. l: Air temperature and relative humidity in the
survey area
Fig.2: Urban canyon having vegetal canopy in road
divider and alongside the road
Fig. 3: Secondary roads which are connected
urban canyon
5. Simulation by the ENVI-met
5.1. ENVI-met:
ENVI-met is a three-dimensional non-hydrostatic
microclimate model including a simple one
dimensional soil model, a radiative transfer model and
a vegetation model (Bruse and Fleer, 1998). The
software is developed by Prof. M. Bruse, University
of Mainz. The software runs on standard x86 personal
computer running Windows XP or Vista and does not
take advantage of more than one processor or
distributed computing []. Therefore the maximum
number of grid cells is quite limited and it is not
possible to simulate the micro-climate of whole cities
but only single quarters within. ENVI-met uses an
uniform mesh with a maximum of about 300x300x35
cells with the horizontal extension ranging between
0.5-l0m and a typical vertical height of 1-5m [2]. The
version of ENVI-met used in this study is a developer
version and contains some ameliorations and features
that are not available in the version 3.1 which is
currently available to the public. One of these new
features, the possibility to explicitly force the
meteorological parameters at the inflow boundaries, is
used in this study [3].
aan
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{11.00a-m.-l2.00p.m.,25Auqust 2013)

7. #H ffiffiWWwffim
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The AIUB Journal ofscience and Engineering (AJSE), Vol. 14, No. l, August 2015
5.2. Model Area and simulation:
A linear segment of the Satmasjid road has been
raldomly selected on the basis of tire typical character
of.the urban canyon with porosity and' variations of
height in the urban fabric. The selected segment of the
road has
_a
large playground on the east side, plant
nursery alongside the boundary walls, l5m high trees
on the road islands and in the periphery ofthe canyon
in some places. The length oi th. urbun canyon for
study area was determined according to l:10 width_
Iength ratio, where the width was 30t and the length
was taken for 400m from a node to another node. For
the modeling an area of 320m X 400m has been
selected to assess the impact of the urban canyon on
the microclimate of this area. The selected area is
divided- in to 80 grids in X-axis and 100 grids in y-
axis where each grid is equal to 4m i +rn. fn,simulation was done in the date of field survey, i.e.
26tr' August, 2013 and the time s"g..nt-*u, tut"o
from 10 A.M. to 4 p.M. Total simuiation time was 6
hours where the data was taken at l0 A.M., 12p.M.,2
P.M. and 4 P.M. The tress in the road island was not
considered in simulation model as these trees were not
so large or dense to have significant impact on the
radiant temperature ofthe urban canyon.
Fig. 5: Simulated Air temperature at l2 p.M.
5.3. Validation of simulation output:
To compare the simulation result with the real world
data, five "Study zones".were picked up randomly
from the selected area adjacent L tne urbun .unyon.
The simulation result of air temperature and relative
humidity in these ,,Study
,on.r" at 12 p.M. was
compared with the field data taken from I I A.M. to 12
P.M. the comparison as follows
The temperature difference from the field data to
simulation data is maximum 2.5 K. Temperature
difference between field data and simulation'Oata in
study zone I and2 is very nominal as these zones are
inside the urban canyon. In the simulation, the distant
zones from the urban canyons like study zone 4 and 5
shows around 2.5 K temperature difference than the
field data. Hence, minimum temperature diitbrence
validates the simulation output.
-,,'''..jffiffitr.
ffiffie
s&ffi
ffiffiwffi
W
ksffiffi.
ffi*w&
Fig. 4; Study zones
model
The v-alue of Avg. Relative humidity in the field data
[fig l] is. slightly higher than the simulation orrro*r,
as relative humidity is subject to unpredictable
atmospheric condition, cloud cover etc.
in the real world and simulation
- ^".-..,g
".,,.,-,&., ".,,".@ *,",.,.",
E:3 -.-*--t= ",.,,,..,",E -",.-"-I.,,,,.,,,,,
@,-",.,-.
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AirTemperatureDffi
#013study zone Field Data Simulation
l)ata
0l 33.20 C or 306.35 K 306.29 K
02 30.0' C or 303.15 K 304.78 K
03 ?4.8" C or 307.95 K 30s.54 K
04 33.9' C or 307.05 K 30s.79 K
05 34.3" C or 307.45 K 305.28 K
AverageRelativeHumffi
26tr' August. 2013
Simulation Data
Average Wind vetocity (V) aJ liT.frt. on-ZOr
August, 2013
Field Data
(AVG.)
Simulation Data
(Avs.)
1.5 m/s 1.24 m/s
131

8. Tariq, Trisha and Tasnim: Impact of Urban canyon on the micro climate: A study through ENVI-met model
The value of Avg. Wind velocity in field data has
nominal difference with the simulation outcome. In
zone 1,2 and 3 wind velocity at road level was
inconsistent due to the wind turbulences crealed by the
moving vehicles. Therefore, an average value was
taken as 1.5 m/s at 10m from ground level.
6. Simulation Result
The simulation result of Air temperature (T), Relative
humidity (Rh), Mean radiant temperature (Tmrt) and
Wind velocity (V) in five "Study zones" are as
follows,
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' 290
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10:00 l2:rl0 1{:0J 16:00
7. Observation and Findings
From the simulation result the following impact of
urban canyon has been observed, e.g.
Air Temperature: Air temperature increases with the
time from l0 a.m. to 4 p.m. in the entire area. The
parts of urban canyon where both side is enclosed by
the building masses, e.g. study zone 0l shows higher
temperature than other zones. Distant areas from
urban canyon like study zone 4 and 5 does not show
significant temperature variation from it.
Relative Humidity: Relative humidity decreases with
the time from l0 a.m. to 4 p.m. in the entire area.
Unlike the air temperature the parts of urban canyon
where both side is enclosed by the building masses,
e.g. study zone 0l shows lower relative humidity than
other zones. Distant areas from urban canyon like
study zone 4 and 5 show slightly higher variation in
relative humidity from it.
Mean Radiant Temperature: Mean Radiant
temperature increases with the time from 10 a.m. to 2
p.m. in the entire area. But it varies in different zones
at 4 p.m., especially where the building heights are
higher and have comparatively dense tree canopy.
Distant areas from urban canyon like study znne 4 and
5 does not show significant variation in mean Radiant
temperature from it. At 4 p.m., large show casting by
higher buildings and trees alongside the roads in zone
2, 3 and 4 have impact in reduced mean radiant
temperature.
Wind velocitv (V) (m/s)
Study
Zone I
Time
l0:00 l2:00 14:00 16:00
Zone 01 1.2 1.2 0 t.l
Zone 02 t.4 1.5 .6 t.7
Zone 03 1.4 t.7 9 2.0
Zone 04 0.9 0.9 J 1.3
Zone 05 0.9 0.9 .0 1.0
Air Temoerature (T) (Kelvin)
Study Zone /
Time
l0:00 l2:00 l4:00 l6:00
Zone 01 298.4 305.8 309.0 309.9
Zone 02 298.4 305.5 308.4 308.5
Zone 03 298.4 305.5 308.7 308.5
Zone 04 298.3 305.5 309.0 308.5
Zone 05 298.3 305.2 308. I 308.1
Relative [Iumiditv (RIil (%)
Study Zone
/ Time
l0:00 12:00 l4:00 16:00
Zone 0l 63.9% 38.9Yo 3t loh 30.5%
Zone 02 64.8% 41.2% 33.8% 32.2%
Zone 03 65.6% 41.2Yo 32.9% 32.2%
Zone 04 665% 41.2% 32.9% 31.5%
Zone 05 64.8% 42.2Yo 34.7Yo 33.6%
Mean Radiant Temperature (TMRT) (Kelvin)
Study Zone
/ Time
l0:00 12:00 l4:00 l6:00
Zone 0l 328.7 335.2 345.4 345.7
Zone 02 328.7 335.2 345.4 311.5
Zone 03 328.7 335.2 345.4 306.6
Zone 04 328.7 335.2 345.4 3l 1.5
Zone 05 316.0 335.2 345.4 340.8
I "i/

9. The AIUB Journal of Science and Engineering (AJSE), Vol. I 4, No. I , August 20 I 5
Wind velocity: Wind velocity increases with the time
from
_10
a.m. to 4 p.m, in the entire are4 qspecially in
.zone 2 and 3. Both of these zones are inside the uiban
canyon and diagonal to the wind direction. The distant
areas from urban canyon like Zone 4 and 5 shows
noticeable drop in wind velocity probably begause of
obstaclos like buildings and large trees. Lbrge field in
the study area have significant impact on wind
velocity in entire area. Open space increases the flow
of wind and maintain a moderate wind velocity in the
urban canyon and its surrounding area. Another
ngtable finding is that, the wind velocity increases
with the rise of air temperature in the study zones of
urban canyon like zone 2 and zone 3.
8. Conclusion
The study was intended to understand the impact of
urban canyon on the micro climate of the surrounding
area. From the outcome of simulation in ENVI-met, iI
has been observed that the urban canyon has
significant impact in the Air temperature, Relative
humidity, Mean radiant temperature and Wind
velocity of the adjacent area of it. But the data from a
distance of approximately l00m from the urban
canyon shows slide changes in values from that of it.
Therefore, it can be summarized that the distant areas
froy urtan canyon has relatively lower temperature
and higher humidity level, which makes the
difference. But, in reality the micro-climate in the
distant area form the urban canyon might have notable
impact, as the urban canyon is alwayi crowded with
pedestrian traffic, fast moving cars, traffic
conjunctions at nodes and consta4t change in wind
velocity and radiant temperature.
References
[1] S. Huttner. S,.M. Bruse, p. Dostal,,.Using ENVI-met to
simulate the impact of global warming on the microclimate
in central European cities',, proceedings ofthe 5th Japanese_
9-"ITul Meeting on Urban Climatology, October ZOOI, pp.
307-3t2.
[2] G. Latini, R. Cocci Grifoni, S. Tascini, ..Thermal
Comfort and Microclimates in Open Spaces", 2010
[3] Mohamed H. Elanbawi, N. Hamza, S. Dudek, ,,Use
and
evaluation of the ENVI-met model for two different urban
forms in Cairo, Egypt: Measurement and model
simulations", Proceedings of l 3th conference of international
building performance simulation Association, Chambery,
France, August 2013,pp. 26-28
li!' Saiful Hasan Tariq is teaching as a
Lecturer in the Department of Arihitecture, Airerican
International Univprsity-Bangladesh (AIUB) since 3lst
August, 2014. Before that, He has received his Bachelor
of Architecture (B.Arch) degree from Dept. of
Architecture, Bangladesh University of Engineering and
Technology (BUET) in 2009. In May 2009, he had jbined
as a lecturer in the Department of Architccture, Starnford
University Bangladesh. At present he is doing Masters in
Architecture (M.Arch) in Bangladesh University of
Engineering And Technology (BUET). He has several
Local and International publications in the related field
and presented research paper in two Intemational
conferences having a
,,Best paper Award" in one of them.
In addition, he is the member of lnstitute of Architects
Bangladesh (IAB) and continuing his profession as an
Architect along with the Academic Career.
at the Dept. of
Engineering and
B.Arch. in 2012
Haque Trisha is teaching as a lecturer
Architecture, Bangladesh University of
Technology (BUET). She completed her
from Dept. of Architecture, Bangladesh
University of Engineering and Technology (BUET). At
present she is doing M. Arch. from the same university.
Since 2012, she taught at Stamford University Bangladesh
before joining at BUET. She has a number of national and
international publications in reputed journals and conference
proceedings.
IlZarrin Tasnim is working as an
architect in J.A.Architects. She h* .ompieteJ the
B.{r9! from Bangladesh University of Engineering
y! Tgchnology (BUET) in 2009. Currentty she ii
doing M.Arch in the ,same
University. Her research
interest covers the issues of suitainable urban
neighborhood. In addition, she is the member of
lnstitute of Architects Bangladesh (IAB).

10. 1. Air Temperature
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Tariq, Trisha and Tasnim: Impact of Urban canyon on the micro climate: A study through ENVI-met model
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11. The AIUB Journal of Science and Engineering (AJSE), Vol. 14, No. l, August 2015
3. Mean Radiant Temperature 4. Wind velocity
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