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Materials and Usage of Treatment for Thermal Insulation

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

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Materials and Usage of Treatment for Thermal Insulation

  1. 1.  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
  2. 2.  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.
  3. 3. 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
  4. 4.  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.
  5. 5.  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.
  6. 6.  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.
  7. 7.  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.
  8. 8.  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.
  9. 9.  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
  10. 10.  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
  11. 11.  High Thermal resistance .  Fire proof.  Chemical stability.  Water/moisture proof.  Insect proof.  Durable.  Low cost.  Light weight.  Readily available.
  12. 12.  Cost of insulating materials  Area to be covered  Standard of insulation required  Effectiveness  Cost of energy consumed for heating and cooling  Durability
  13. 13.  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
  14. 14.  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 .
  15. 15.  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
  16. 16.  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.
  17. 17.  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  .
  18. 18.  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

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