WOLKITE UNIVERSITY COLLEGE OF ENGINEERING AND TECHNOLOGY

CLASS ROOM
Architectural sciences 4 (Acoustics)

Group Members Name ID NO

Mahder Fikadu ENGR/542/11

Mahlet Kindie ENGR/544/11
Amanuel Mulugeta ENGR/093/11 D E PA R T M E N T O F A R C H I T E C T U R E
Khalid Mehdi ENGR/1001/11
Natnael Biniyam ENGR/654/11
Imran Muder ENGR/299/11
Biruk Fekade ENGR/184/11
Selam Belay ENGR/730/11
Leta Merga ENGR/528/11
Roman Amin ENGR/699/11

Date of submission: 11/23/2022

Submitted to: IN. Tegbaru G.
Location map
Computer science
department
Main intrance Engineering and
TEchnology department

Students lounge

Mini-media

Students cafe

Graduation hall

Specific single class room

Class room
• Class room are learning space in whitch both
children and adults learn.
• Class rooms are found in educational institution
of all kind.
• Class room provide space where learning can
take place.
Sound Analysis
Generator house

Students passing
through

Car passing on
the road

Students lounge

Environmental Sound
Mini-media distruction sources
• The generator on the back
of the class
• Pedistrians passing on the
road
• The mini-media podcast
• The students lounge
• Sound from cars

Background noise sources

• Through the wall from adjecent classroom

• From the floor from class room below
• Over the ceiling from the roof
• From outside through exterior walls
• from outside through windows
Floor plan and Elevations

Floor Plan

Left side elevation

Elevations

Right side elevation

Front side elevation

Back side elevation

Section view
The Impact of Humidity and Temperature
in Room Acoustics
Humidity is the moisture retention in the air, or in other words, the amount of water present in the air.
• When you have high humidity, sound must travel through both the air and the water to reach its destina-
tion.
• Sound travels more slowly through humid air than air that is not as humid.
• But hotter air is less dense than cold air, so sound tends to travel better in hot weather, unless, of course,
there is very high humidity.

maximum acceptable sound pressure levels in rooms with different types of activities.

Activity and Type of Area Noise RatingNR value Lp(dBA)

School, lecture room 25 30
School, corridor 30 35
Sound measurment of the class room
Class room with no students ---------------------------43db - 47db
Class room with few students talking------------------63db - 75db
Class room with full stydents talking-------------------66db - 86db
When chair is pulled------------------------------------80db - 82db
Students on the corridor talking------------------------58db - 68db

Absorbtion coefficients
Material 125 250 500 1000 2000 4000

• 4mm glass 0.30 0.20 0.10 0.07 0.05 0.02

• plywood 0.45 0.25 0.13 0.11 0.10 0.09
• Adult Person 2.5 3.5 4.2 4.6 5.0
• Ceramic tiles with 0.01 0.01 0.01 0.02 0.02 0.02
smooth surface
• Painted plaster surface 0.02 0.02 0.02 0.02 0.02 0.02
on masonary wall
• Chip board 0.20 0.25 0.20 0.20 0.15 0.02

Activity analysis
Activity By day By week
Students 2:30 - 6:00 am Monday-Friday
7:30 - 9:00 am
Pedistrians All day All week
Cars Any time All week
Generator When light gose off when light gose off
Students lounge Break fast time 1:00 - 3:00 am All week
Lunch time 6:00 - 8:00 am
Dinner time 12:00 - 4:00 pm
Window suggetion
Soundproofing Window
Soundproof windows will typically have multiple layers of glass with air gaps in between.

How Glass Windows Reduce Noise:

• Thickness

The thicker the glass, the better its noise reduction proper-
ties.

• Spacing

The larger the gap between the panes of glass the better
acoustic performance of soundproof glazing.
Reductions in noise can be increased by filling the gap be-
tween the panes with argon and krypton, or by a vacuum
being created in between the panes.

• Interlayers

Laminated glass has a thin layer of polyvinyl butyral

(PVB) sandwiched between two panes of glass to form the
outer pane. PVB provides excellent acoustic performance
by dampening soundwaves. It also makes it much more
difficult to break. The PVB prevents the glass from shatter-
ing, and the window stays in one piece, so security is also
increased.

Acoustic Glass
Acoustic glass is a special type of insulating glass which is
designed to absorb and therefore reduce external noise.

Class 5 - 45 dB
• Recommended for major streets with 1000 - 3000 ve-
hicles per hour and 10 - 30 m distance between house
and street.
• The first glass pane is made of 8 mm-thick laminated
8 mm-thick 10 mm-thick glass, the second pane is made of 10 mm-thick float
laminated glass, float glass glass and the space between them is 16 mm with an
overall thickness of 32 mm.
16 mm space
between them
solid external wall

external window
frame

10 mm-thick
external glass

Sliding window type

8 mm-thick
laminated glass,

Roller blind curtains

• Curtains are one of the sound insulation materials
and roller blind curtains are mostly used.

In general, roller blind curtains are acrylic coated poly-

ester fabrics in which acrylic coating maintains the ul-
traviolet (UV) resistance and polyester fabric maintains
the durability of the curtain. Mostly, one side (back) of
the polyester fabric is coated by acrylic resin in industrial
applications.
Analysis based on class room whiteboard

Analysis based on class room whiteboard

The class room whiteboards are low budget
White boards and less durable and less
sound proof .
• Most of them use have card board on
the median and steel and melamine on
the outer surfaces
And almunium frame .

• they are also wall atached whiteboards this make them less usefull when we compare them with dou-
ble face acoustic whiteboards
and also it makes sound transmission between two rooms easly.

• And just because they are not mobile whiteboards teachers and students are obligated to move them
from one place to another this also makes sound disturbance.
Extruded whiteboard
White Board Suggetions
Acoustic White Board Details:

• Durable, high quality drywipe and magnetic re-

ceptive whiteboard writing surface to both sides of
the ThinkingWall Acoustic Freestander.
• Integrated acoustic panels provide sound dead-
ening and reverberation reduction properties. The
acoustic panels are available in a range of colours
so can be linked with interior decor or corporate
branding.
• Stable and sturdy base with high quality twin
wheel lockable castors for easy manoeuvrability
and repositioning (4 castors on the 1500mm wide
option and 6 castors on the 2400mm wide option).
• Clean modern look combining frameless white-
board panels, powder coated steel frame and
lacquered end grain plywood.
Dimensions: Made from 4 distinc-
tive types of materials
Width: 1500mm or • Melamine,
2400mm • Steel or Glass.
Height: 1925mm • Aluminum
Depth: 400mm
Analysis based on class room ceiling
 The shade style of celing helps to
absorb the reflected noise sound

Suspended ceiling type

Fiberglass Ceiling
Sound absorption performance: NRC is about 0.8

Product materials: fire prevention, environmental

protection glass fiber as the main material

Product color: Black, white and other colors custom-

izable

Product features: light weight, convenient for con-

struction and transportation

Specification: Rectangle: 1200/1600/1800(length) *

200/400/500(wide) * 40(thick) mm

Wave shape: 1200/1800(length) * 400(wide) *

40(thick) mm
Envirotech Acoustic Ceiling
Echo Stop acoustic Ceiling Tiles offer excellent sound control
performance by providing high sound absorption.
Acoustic

Acoustic Ceiling Tiles (25 mm) NRC is 0.95, which can effec-
tively control and adjust the indoor reverberation time, reduce
noise, the improve sound quality.

Environmental friendly

Envirotech Acoustic Ceiling Tiles and Panels are Fungi and

stains-resistance, recyclable, no radiation, does not contain
any harmful substances. A new type of green building material
without pollution to the surroundings.

Thermal Insulation and Energy Saving

Envirotech ceiling tiles are good thermal insulation , effectively block the diffusion of cold and hot air indoor,
reduces the external temperature on the impact of indoor temperature, balance the temperature difference,
effectively save energy It has thermal conductivity TR≥ 0.39(m2. K/W)
Properties

Thickness Edge Sizes resistance Sizes Sound Absorption Weight Light Reflection
20/25 mm Square Class A Water resistance , 595×595 , Upto 0.95 0.8 Kg/m2 85 %
Dust resistant 600 x 1200

Sustainable Series Acoustic Ceiling Tile

• The Sustainable Series Acoustic Ceiling Tile is a pure white ceiling
tile offering excellent acoustics with an environmentally sustain-
able composition.
• The white sustainable eco-fabric is laminated to the acoustic core
to provide an exception, white finish. The combination of these
materials allows the Sustainable Series to meet green building
code requirements.
Technical Information
• Sizes: 2’x 2’, 2’x 4’
• Thickness: 1’’, 2’’
• Core Material: 6-7 pound per cubic foot high density yellow fiber-
glass
Optional: Brown Ecose Board
Ecose uses an organic based bonding agent, which is 70% less
energy intensive than traditional petroleum-based bonding agents.
Ecose is 100% recyclable
• Edges: Natural / Square
• Finish: Sustainable Eco-Fabric laminated to face of core
• Color: White (only)
• Mounting: Drop into existing T-bar suspended grid
• Fire Rating: Class 1
• NRC: 0.70 , 0.80-0.90
Analysis based on class room Furnitures
Steel

Steel cover

Florescent

Glass tube Argon Electrode coil Aluminum cap

Phosphor coating Liquid mercury Cathode shield Glass Stem

Suggetions for lighting fixture
Accoustical Florecent lighting fixture

Wall mounted fixture above the white board

Accoustical pendant
Florecent lighting fixture

Pendent Projector mounted on the ceiling

 Vegetation

Existing vegetation

DECIDECIOUS SHRUB

Deciduous shrub, 0.9-1.2 m tall, equal width, upright, mounded.

Leaves yellowish, alternate, 1.5-3.0 cm long, one-third as wide,
borne in clusters. Flowers yellow, few, 8-20 mm across; fruit 0.8 mm
across.
Suggetion for floor material
Acoustical – Acoustic Rubber Underlay
This high-performance material is made of recycled rubber material
for a greener solution to soundproofing.

Features & Benefits

1. High-performance noise control
2. Cost-effective
3. Recycled rubber materials
4. Provides STC & IIC ratings
5. Dampens vibrations
6. Comfortable and resilient
7. Easy to install and work with
8. Sold by the roll
9. Works with most flooring assemblies

Products Spec

Material Recycled Rubber

Pattern Flat, semi-smooth

Features Effective Sound Control

Applications Soundproof Floor Underlay.

Color Black

Installation DA-5 Adhesive

Analysis based on class
room Door
Head (header)
The horizontal member which forms the top of a frame

Hinge jamb
The vertical frame member prepared for hinges or pivots

Strike jamb
The vertical frame member prepared for a strike

Light
A glazed opening

Door face
The exposed surface of the door not including the vertical edges and top and bottom

Lock set
The hardware and components that make up the locking or latching mechanism on a door

Strike plate
A metal plate affixed to a doorjamb with a hole or holes for the bolt of the door. When the door is closed, the
bolt extends into the hole in the strike plate and holds the door closed.

Core
The material(s) in a hollow metal door or panel

Continuously Welded Frames

Also called full profile welded or fully welded. The comer/perimeter
Joints have all elements of the frame member continuously welded including soffits,
stops, rabbet, faces, and returns.

For doors with glass kits, the STC rating decreases as the glass kit size increases
–Use of laminated glass with an air pocket is recommended to help reduce the transmission of sound waves
•Door openings rated up to STC 54 generally can be a standard 1¾” thick.
•Door openings rated STC 55+ can only be achieved with doors that are 2 ¼” or thicker. This increases the
cost of the doors.
Wall detail and suggested materials
• This new soundproofing for walls is designed
to absorb and reduce the amount of airborne
noise which penetrates poorly insulated party
walls. Easy to fit, this 20mm thick insulation
is simply glued to the existing wall with two
layers of 12.5mm plasterboard bonded on
top.

The soundproofed wall shown in the detail on

the right of this page had a sound insulation val-
ue of 48dB DnT,W+Ctr which is approx. an 87%
reduction in sound transmission.

Without an air gap, the foam board

insulation will not insulate the room
correctly. An air gap helps improve the
insulation’s performance by transfer-
ring heat more efficiently.