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Thermal insulation - PowerPoint PPT Presentation


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Thermal insulation. Insulating our house can save us hundreds of pounds each year. Energy in the home. We lose energy from the roof, the door, the walls and the windows. In order to reduce electricity bills and pollution, we need to keep energy losses from our homes to a minimum.

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Presentation Transcript
slide1

Thermal insulation

Insulating our house

can save us hundreds

of pounds each year

slide2

Energy in the home

We lose energy from the roof, the door, the walls and the windows.

In order to reduce electricity bills and pollution, we need to keep energy losses from our homes to a minimum.

slide3

Energy loss prevention

As you go through the next few slides complete the table below to show how various types of insulation prevent heat energy loss from our homes.

slide4

Heat loss prevention - curtains

Curtains reduce draughts [convection currents] leaving the house. They are opaque and so don’t allow much radiated heat to pass through them.

slide5

Heat loss prevention - bricks

Most outside walls have an empty space between the 2 layers of bricks called a cavity.

This reduces heat loss by conduction through the bricks.

Cavity wall foam insulation is pumped in between the bricks to prevent convection within the cavity.

slide6

Heat loss prevention - windows

A great deal of energy is lost through windows.

By adding an extra pane, the trapped air in between acts as an insulator to reduce heat loss by conduction.

The insulating effect of the gap can be improved further by sucking all the air out to create a vacuum.

Double glazing is expensive and difficult to smash without a special hammer.

slide7

Heat loss prevention - roof

The air heated by central heating is less dense than the cooler air around it and rises.

The ceilings get heated and eventually the heat escapes through the roof.

Loft insulation contains trapped air which forms an insulating layer between the rooms and the attic.

slide8

Heat loss prevention - radiators

Radiators heat the wall a great deal - this wastes heat energy.

Placing shiny silver coated card between the wall and the radiator reduces heat loss by radiation by reflecting it back into the room.

slide9

Heat loss prevention - draughts

Draughts are convection currents.

A great deal of heat energy is lost in this way but it is the easiest type to prevent.

Draught excluders are hairy or spongy strips which close gaps and prevent the convection currents escaping.

slide10

Thermal insulation

Insulating our house

can save us hundreds

of pounds each year

slide11

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide12

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide13

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide14

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide15

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide16

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide17

Thermal insulation

The most effective insulation is the one which

saves you most money each year in heating bills.

Effective

The most cost effective insulation is the one which

has the shortest payback time.

Cost effective

Installation cost: £ 450

Annual saving on heating bills: £75

Cavity wall

insulation

Installation cost: £ 150

Annual saving on heating bills: £150

Loft

insulation

The loft insulation pays for its self in only a year so it is very cost effective

The cavity wall insulation takes 450 75 = 6 years to pay for itself

So loft insulation is more cost effective than cavity wall insulation

slide21

Calculate the pay-back time for each method:

Why is double glazing so popular if the pay-back

time is so long?

slide24

Preventing energy loss

How does the vacuum flask keep hot drinks hot OR cold drinks cold?

2. The plastic / cork lid is an insulator and prevents convection currents escaping.

1. The vacuum between the 2 layers of glass prevents heat leaving or entering by conduction.

3. The silvered walls prevent heat leaving or entering by radiation.

slide27

Energy loss prevention

As you go through the next few slides complete the table below to show how various types of insulation prevent heat energy loss from our homes.

slide28

Thermal insulation

The most effective insulation is the one which

Effective

The most cost effective insulation is the one which

Cost effective

Installation cost: ……..…

Annual saving on heating bills: ……….

Cavity wall

insulation

Installation cost: ……….

Annual saving on heating bills: ……….

Loft

insulation

The loft insulation pays ……………………………………………………………………

The cavity wall insulation takes ………………….……………………………………..

So loft insulation is more cost effective than cavity wall insulation

slide29

Preventing energy loss

2. The plastic / cork lid…………………………………………………………………………

How does the vacuum flask keep hot drinks hot OR cold drinks cold?

1. The vacuum between the 2 layers of glass ………………………………………………………………………………

3. The silvered walls ………………………………………………………………………………