Natural Sciences Grade 7 Term 3 Energy and
![Natural Sciences Grade 7 Term 3: Energy and Change Insulation and energy saving Natural Sciences Grade 7 Term 3: Energy and Change Insulation and energy saving](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-1.jpg)
![Topic 4 Insulation and energy saving Using insulating materials [part 1] Natural Sciences - Topic 4 Insulation and energy saving Using insulating materials [part 1] Natural Sciences -](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-2.jpg)
![Using insulating materials Materials that are heat insulators: • keep cold items cold; • Using insulating materials Materials that are heat insulators: • keep cold items cold; •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-3.jpg)
![Types of insulators • Materials that contain air spaces, are the best insulators. • Types of insulators • Materials that contain air spaces, are the best insulators. •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-4.jpg)
![Insulators are used to reduce heat transfer Styrofoam • It is made from polystyrene Insulators are used to reduce heat transfer Styrofoam • It is made from polystyrene](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-5.jpg)
![Insulators are used to reduce heat transfer Ceiling insulation • It minimizes heat gain Insulators are used to reduce heat transfer Ceiling insulation • It minimizes heat gain](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-6.jpg)
![Insulators are used to reduce heat transfer Materials that keep us warm • Woollen Insulators are used to reduce heat transfer Materials that keep us warm • Woollen](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-7.jpg)
![Insulators are used to reduce heat transfer Insulating vacuum flasks and cool boxes • Insulators are used to reduce heat transfer Insulating vacuum flasks and cool boxes •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-8.jpg)
![Insulators are used to reduce heat transfer Water pipes - Cover water pipes with Insulators are used to reduce heat transfer Water pipes - Cover water pipes with](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-9.jpg)
![Insulators are used to reduce heat transfer Traditional / Indigenous homes Ø Roofs and Insulators are used to reduce heat transfer Traditional / Indigenous homes Ø Roofs and](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-10.jpg)
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![Natural Sciences Grade 7 Term 3 Energy and Change Insulation and energy saving Natural Sciences Grade 7 Term 3: Energy and Change Insulation and energy saving](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-1.jpg)
Natural Sciences Grade 7 Term 3: Energy and Change Insulation and energy saving
![Topic 4 Insulation and energy saving Using insulating materials part 1 Natural Sciences Topic 4 Insulation and energy saving Using insulating materials [part 1] Natural Sciences -](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-2.jpg)
Topic 4 Insulation and energy saving Using insulating materials [part 1] Natural Sciences - Grade 7
![Using insulating materials Materials that are heat insulators keep cold items cold Using insulating materials Materials that are heat insulators: • keep cold items cold; •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-3.jpg)
Using insulating materials Materials that are heat insulators: • keep cold items cold; • slow down heat transfer from the surroundings; • keep hot items hot; • slow down heat transfer from the hot item to the cooler surroundings; • insulated window coverings [awnings; curtains; blinds; etc. ]. • In summer it is closed [minimize heat gain] to cool the house and block out the sun’s radiation. • In winter it is kept open to allow the sunlight through the house. Natural Sciences - Grade 7
![Types of insulators Materials that contain air spaces are the best insulators Types of insulators • Materials that contain air spaces, are the best insulators. •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-4.jpg)
Types of insulators • Materials that contain air spaces, are the best insulators. • Examples: - thatched roof [air is trapped in the spaces between the grass of the thatch] - wool - cork - straw - feathers - grass - styrofoam Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Styrofoam It is made from polystyrene Insulators are used to reduce heat transfer Styrofoam • It is made from polystyrene](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-5.jpg)
Insulators are used to reduce heat transfer Styrofoam • It is made from polystyrene [a type of plastic; plastic is a poor conductor of heat]. • It is also used to make food packaging [picnics; take-away meals; hot coffee; etc. ]. • The food in styrofoam boxes can be kept warm / hot. Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Ceiling insulation It minimizes heat gain Insulators are used to reduce heat transfer Ceiling insulation • It minimizes heat gain](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-6.jpg)
Insulators are used to reduce heat transfer Ceiling insulation • It minimizes heat gain during summer. • It minimizes loss of heat during winter. • It is mostly made from fibreglass strands [air is a poor heat conductor and it becomes trapped between the fibreglass’ strands ; the amount of heat loss/gain is limited; stops conduction and convection from taking place]. • Foam can be sprayed in the roof structure above the ceilings. • Blanket insulation can be rolled out above the ceilings. Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Materials that keep us warm Woollen Insulators are used to reduce heat transfer Materials that keep us warm • Woollen](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-7.jpg)
Insulators are used to reduce heat transfer Materials that keep us warm • Woollen clothing prevents the body heat from escaping, e. g. jerseys; woollen hats; gloves; jackets; etc. • Bedding, e. g. blankets; duvets; comforters; etc. • It keeps people warm when it is cold. The air is trapped between the fibres and therefore extra insulation is given. • Thermal jackets worn by Russian, Eskimo and Norwegian people keep them warm in temperatures that are below 0°C. Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Insulating vacuum flasks and cool boxes Insulators are used to reduce heat transfer Insulating vacuum flasks and cool boxes •](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-8.jpg)
Insulators are used to reduce heat transfer Insulating vacuum flasks and cool boxes • Insulating materials such as plastic and styrofoam are used to make cooler boxes [foam / sponge materials are excellent insulators. They have many air bubbles in the foam. Air is an excellent insulator. • Liquids are kept hot or cold in vacuum flasks. Between the flask and the casing is a vacuum, meaning no air particles. Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Water pipes Cover water pipes with Insulators are used to reduce heat transfer Water pipes - Cover water pipes with](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-9.jpg)
Insulators are used to reduce heat transfer Water pipes - Cover water pipes with an insulating material to: Ø prevent water from freezing and water pipes from bursting as well as preventing water waste. Ø prevent loss of heat through the metal pipes and reduce electricity waste. - Water pipes are made from plastic materials [PVC]. Doors Ø Fill the gaps of fitted doors with foam rubber [weather strips] to prevent warm air from escaping. Walls Ø Build outer walls with a double layer of bricks [cavity walls - air space reduces heat transfer]. . Natural Sciences - Grade 7
![Insulators are used to reduce heat transfer Traditional Indigenous homes Ø Roofs and Insulators are used to reduce heat transfer Traditional / Indigenous homes Ø Roofs and](https://slidetodoc.com/presentation_image_h/fbe13ed7888fe40150a94cb9f0159d1a/image-10.jpg)
Insulators are used to reduce heat transfer Traditional / Indigenous homes Ø Roofs and some walls are made of grass which is a good natural insulator. Ø The framework is smeared with mud. Ø Floors are made from cow dung [dries and form a hard, waterproof floor and it is heat insulating]. Ø Rondavels are build with thatched grass roofs [Xhosa]; beehive huts [Zulu]. Natural Sciences - Grade 7
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