Brief ppt on thermal insulation for barch 2nd sem students....

2.  Thermal insulation is the reduction of heat
transfer (the transfer of thermal energy
between objects of differing temperature)
 Thermal insulation in building is the retention
of heat within the building irrespective of the
outside temperature.
 Thermal insulation, materials used to reduce
the rate of heat transfer

3.  Fibrous materials are generally good insulators.
 Heat flows from higher level to lower level
,therefore in building also heat flows from hotter
area to cooler area.
 Heat flows as per
the capacity of
the building
materials or units
like floors ,walls ,
roofs ,doors ,
windows.
 In summer the heat transfer from the out side to
inside and in winter the process is reversed.

4. The heat in a building
structure is mainly transmitted
through the roofs, exposed walls
And exposed wall openings, such
as windows, doors, ventilators,etc.
and accordingly the
methods of heat insulation usually
adopted are as follows:
 Methods of heat insulation of roofs
 Methods of heat insulation of exposed walls
 Methods of insulation of exposed windows, doors &
ventilators etc

5.  Heat insulating materials are applied
internally or externally to the roofs. In
case of external application, heat
insulating materials may be installed
over the roof but below a waterproof
course. In case of internal application,
heat insulating materials may be fixed
by adhesives or otherwise, on the
underside of roofs from within the
rooms.
 Flat roofs may be kept cool by flooded
water either by storing or by spraying
regularly. White washing of the roof
before onset of each summer also
helps in heat insulation.

6.  The false ceiling of insulating
materials may be provided below
the roof with air gaps in between.
 Shining and reflective insulation
materials may be installed or laid
on the top of the roof. An air
space may be created on top of
flat roofs by arranging sheets of
asbestos cement or corrugated
galvanized iron over the bricks.
 Suitable shading of roof on the
exposed surfaces also reduces
the surface temperature.

7.  The thickness of the walls
may be increased or
decreased, depending upon
the insulation used.
 The heat insulating
materials of different types
can be installed or fixed on
the inside and outside of the
exposed wall in order to
reduce the thermal
transmittance to the desired
limits. In case external
application, overall water
proofing should be done.

8.  Hollow wall or cavity wall
construction may be adopted.
 For partition walls, an air space
may be created by fixing the
sheathing of hard boards or
battens on either side of the
walls.
 Light colored white-wash or
distemper may be applied on
the exposed surface of the wall
to increase thermal insulation
value.

9.  All windows, doors, ventilators etc.
which are exposed, transmit heat to
a considerable extent. The following
methods can be suitably used to
achieve heat insulation of exposed
windows, doors etc.
 Where glazed windows and doors
are provided, the reduction of heat
transmission may be achieved by
insulating glass or double glass with
air space in between or by any other
suitable means.

10.  The incidence of solar heat on
exposed doors and windows
can be reduced by the
following means
 By use of external shading,
such as louvered shutters,
sun breaker and chajjas or
weather sheds.
 By adopting internal shading,
such as curtains in heavy
folds, Venetian blinds etc

11.  Maintains comfortable living conditions .
 Keeps the room cooler in summer and warm
in winter.
 Results in lot of fuel saving and maintenance
cost.
 Helps in reduction of noise level ,absorbs the
vibrations generated by the system, prevents
the spread of fire and adding structural
strength to walls or ceiling

12.  High Thermal resistance .
 Fire proof.
 Chemical stability.
 Water/moisture proof.
 Insect proof.
 Durable.
 Low cost.
 Light weight.
 Readily available.

13.  Cost of insulating materials
 Area to be covered
 Standard of insulation required
 Effectiveness
 Cost of energy consumed for heating and
cooling
 Durability

14.  Fiber Glass
 Rock wool
 Multi foil
 Vermiculite
 Extruded polystyrene
 Pipe insulation
 Slag wool
 Fiber board
 Flexible blanket
 Saw dust
 Polyurethane foam
 Polystyrene
 Cork board slab
 Mineral wool slab
 Aluminium foil
 Gypsum board
 Asbestos cement sheet
 Chip board
 Foam glass
 Gasket cork sheet
 Foam plastic
 Fiber glass
 Mineral wool
 Wood shaving

15.  FIBERGLASS-
 Most common used
insulation in modern times
and cheap.
 these can cause damage to
eyes, lungs and even skin
and careful handeling.
 it is an excellent and non
flammable materialIts the
most common insulation
used in modern times.
 A range including glass
wool and cavity wall slabs
are used in lofts , partition
walls and timber frame
constructions .

16.  ROCKWOOL INSULATION–
 Rock wool has excellent
thermal,
 acoustic and fire resistance
 properties and is suitable
 for walls , floors and roofs.
 CELLULOSE-
 Most eco-friendly
 Made of recycled
cardboard,paper,and other
similar materials
 Fire resistant
 Cheap and effective than fiber
glass

17.  MULTIFOIL INSULATION-
 Easy and quick to install.
 It requires comparatively less
space
 Used for flooring and roofs
 VERMICULITE INSULATION
 It is light weight , affordable
and a fire proof alternative .
 It is ideal for using in
chimneys , pipe lining and
flooring.

18.  EXPANDED POLYSTYRENE INSULATION-
 This product can be cut to shape and installed in
cavity walls and under floors to provide acoustic
and thermal insulation.
 Polystyrene is a diverse insulation material, but
its safety is debated
 .

19.  PHENOLIC INSULATION-
This provides maximum thermal
performance with minimum
insulation thickness , making it
perfect for rooms
 POLYURETHANE FOAM-
 Rarely used
 Good insulation product
 Uses cfc gas for blowing agent
 Light weight
 Not ecofriendly