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This looks like a typical street | 0:00:02 | 0:00:04 | |
that could be anywhere in the country, but this place is special. | 0:00:04 | 0:00:07 | |
With energy bills going through the roof, | 0:00:09 | 0:00:12 | |
the residents here have agreed | 0:00:12 | 0:00:14 | |
to take part in a unique challenge. | 0:00:14 | 0:00:16 | |
They're going to try and slash their gas and electricity consumption | 0:00:18 | 0:00:21 | |
by a whopping 30% in just three weeks. | 0:00:21 | 0:00:25 | |
Can they do it? | 0:00:25 | 0:00:27 | |
The challenge is to try and cut not just your bills, | 0:00:39 | 0:00:42 | |
but also your general consumption. | 0:00:42 | 0:00:46 | |
And we have set that challenge, it's quite tough, at 30%. | 0:00:46 | 0:00:51 | |
-Ohh! -We have with us an energy sustainability expert, Dr Alan Owen. | 0:00:51 | 0:00:56 | |
Alan has had a good look at your houses in this street. | 0:00:56 | 0:01:00 | |
They're all quite modern houses, Alan, | 0:01:00 | 0:01:02 | |
so presumably they're relatively energy efficient, are they? | 0:01:02 | 0:01:05 | |
-No, not particularly. -Why is that? | 0:01:05 | 0:01:09 | |
Poorly insulated...is the main thing, either floors, lofts, walls. | 0:01:09 | 0:01:15 | |
To demonstrate how poorly the houses are insulated and where the heat is being lost, | 0:01:15 | 0:01:21 | |
Dr Owen has brought energy technician, Gordon, along | 0:01:21 | 0:01:24 | |
to Bill and Mi Yong's house. | 0:01:24 | 0:01:26 | |
So what we are going to do now is we're going to do the thermal-imaging test. | 0:01:26 | 0:01:30 | |
Gordon's taping up the vents and he's also sealing up the front door. | 0:01:31 | 0:01:35 | |
The idea is that we seal the areas which might leak. | 0:01:35 | 0:01:39 | |
So what we're looking to do is to pressurise the house | 0:01:39 | 0:01:42 | |
and try and force the warm air which is inside the house | 0:01:42 | 0:01:45 | |
out through any gaps. | 0:01:45 | 0:01:46 | |
A thermal-imaging camera is used to detect the infrared radiation coming from the house. | 0:01:46 | 0:01:53 | |
They've had the heating on all morning, so if there are any leaks | 0:01:54 | 0:01:58 | |
they should show up as a bright white image on the screen. | 0:01:58 | 0:02:01 | |
There's some slight leakage at the bottom of the door there | 0:02:03 | 0:02:06 | |
where there's maybe a gap at the bottom of the frame. | 0:02:06 | 0:02:08 | |
And you can see that change in temperature. | 0:02:08 | 0:02:11 | |
I've been looking at this area above at the eaves, | 0:02:11 | 0:02:13 | |
-that's showing me that there's a lot of air coming out here. -OK. | 0:02:13 | 0:02:16 | |
So there is a lot of air getting in through your attic space which should be cold. | 0:02:16 | 0:02:19 | |
The gaps in the house are allowing the warm air to escape through convection. | 0:02:19 | 0:02:25 | |
What the thermal-imaging camera doesn't tell us | 0:02:25 | 0:02:28 | |
is how big a volume of warm air is leaving the building. | 0:02:28 | 0:02:31 | |
To find that out, Gordon is going to fill the house with theatrical smoke. | 0:02:32 | 0:02:37 | |
If there are any gaps, they'll be able to see the smoke escaping. | 0:02:39 | 0:02:43 | |
Ohh! Oh, look! | 0:02:45 | 0:02:47 | |
It's pouring out of this end wall. | 0:02:47 | 0:02:50 | |
-But how is it getting up into the eaves? -It's making its way out | 0:02:53 | 0:02:56 | |
through gaps and cracks in the structure, into the cavity wall, | 0:02:56 | 0:02:59 | |
and then from there it then comes out through roof spaces and vents in the wall. | 0:02:59 | 0:03:03 | |
And all that air will carry heat with it. | 0:03:03 | 0:03:06 | |
I would guess for the cost of probably three or four tubes of mastic, | 0:03:06 | 0:03:11 | |
you could save somewhere between £180 and £300 a year in gas. | 0:03:11 | 0:03:16 | |
Bill, I think it looks like you're going to have | 0:03:16 | 0:03:18 | |
-a very, very busy weekend, darling. -Thank you for that, Alan. -ALL LAUGH | 0:03:18 | 0:03:22 | |
As part of this challenge, | 0:03:24 | 0:03:25 | |
we've installed energy monitors inside their homes | 0:03:25 | 0:03:28 | |
and Dr Owen has been monitoring their data remotely for the past couple of weeks. | 0:03:28 | 0:03:33 | |
So 30%, guys. And to help you, we've got Lucy Conway here. | 0:03:34 | 0:03:40 | |
-Now Lucy lives on the island of Eigg which is totally off grid, is that right? -Yes, that's right. | 0:03:40 | 0:03:45 | |
We generate all our own electricity, | 0:03:45 | 0:03:47 | |
so it means that we're very careful with how much electricity we use. | 0:03:47 | 0:03:51 | |
Lucy is going to be on hand over the next three weeks | 0:03:51 | 0:03:55 | |
to give you lots of tips and tricks on how you can save energy. | 0:03:55 | 0:03:59 | |
And, as you know, our team have been filming with you over the last few weeks. | 0:03:59 | 0:04:06 | |
Well, let's have a look at what some of you have been up to. | 0:04:06 | 0:04:10 | |
-ALL LAUGH -Ah! | 0:04:15 | 0:04:17 | |
How proud are you of your fridge, Norman. That's spectacular! | 0:04:17 | 0:04:20 | |
Oh, and another one! ALL LAUGH | 0:04:20 | 0:04:23 | |
Do you have any idea how much running those fridges and freezers costs in a year? | 0:04:26 | 0:04:31 | |
-No. -It's £180 a year just on your fridges. -Just on the fridges?! -OK. | 0:04:31 | 0:04:37 | |
Fridge freezers are on 24 hours a day, | 0:04:37 | 0:04:40 | |
7 days a week, | 0:04:40 | 0:04:42 | |
so choosing an energy-efficient one could save money. | 0:04:42 | 0:04:45 | |
Look for the energy rating label. | 0:04:45 | 0:04:47 | |
The ratings are based on fridges of the same size. | 0:04:47 | 0:04:51 | |
If the electricity tariff is around 15 pence per kWh, | 0:04:51 | 0:04:56 | |
these are the average annual running costs of a 253 litre fridge. | 0:04:56 | 0:05:01 | |
-Jill, how many times do you put the kettle on a day? -Quite a lot. | 0:05:07 | 0:05:10 | |
I put the kettle on and then get waylaid by, normally, a child, | 0:05:10 | 0:05:14 | |
so I'll probably click it on a few times before I actually make myself a cup of tea. | 0:05:14 | 0:05:19 | |
On average a UK household | 0:05:19 | 0:05:22 | |
boils the kettle a staggering 1,500 times a year. | 0:05:22 | 0:05:25 | |
With an energy tariff of around 15p per kWh... | 0:05:27 | 0:05:31 | |
this will cost £26. | 0:05:31 | 0:05:34 | |
This is how it compares to a dishwasher, | 0:05:36 | 0:05:38 | |
desktop computer and microwave. | 0:05:38 | 0:05:41 | |
-That is a huge telly. -That is a huge telly. Is this a plasma telly? | 0:05:44 | 0:05:48 | |
-Yes. -Yeah. They're huge energy guzzlers. | 0:05:48 | 0:05:50 | |
Televisions can be the most power hungry of all entertainment appliances, | 0:05:50 | 0:05:55 | |
but plasmas are the worst offenders. | 0:05:55 | 0:05:58 | |
With an energy tariff of around 15p per kWh... | 0:05:59 | 0:06:03 | |
a CRT TV using 119kWh | 0:06:03 | 0:06:07 | |
costs £18 per year. | 0:06:07 | 0:06:11 | |
An LCD TV using 199kWh | 0:06:11 | 0:06:16 | |
costs £30 per year. | 0:06:16 | 0:06:18 | |
And a plasma using 658kWh | 0:06:18 | 0:06:22 | |
costs a huge £101 per year. | 0:06:22 | 0:06:27 | |
Why did you go for such a big telly? | 0:06:27 | 0:06:30 | |
-It was the biggest we could find. -Yes! | 0:06:30 | 0:06:32 | |
-But why? -It was a competition. -It was a competition? | 0:06:32 | 0:06:35 | |
-Yes. -What with the neighbours? -Yes. -ALL LAUGH | 0:06:35 | 0:06:39 | |
Before they try to cut their energy use, | 0:06:39 | 0:06:42 | |
I want them to understand just how much energy | 0:06:42 | 0:06:45 | |
it takes to power a simple domestic appliance. | 0:06:45 | 0:06:48 | |
I've invited Colin Tonks along to the street, | 0:06:48 | 0:06:52 | |
who's using bicycles to set up a mini power station. | 0:06:52 | 0:06:56 | |
I know you take these bikes all over the place to schools, to festivals, | 0:06:56 | 0:07:00 | |
what are you hoping to demonstrate? | 0:07:00 | 0:07:02 | |
Well, I'm hoping to demonstrate to people just how much energy it takes to power everyday objects. | 0:07:02 | 0:07:07 | |
The first question we ask is, where does energy come from? | 0:07:07 | 0:07:09 | |
-Some people will say it comes from the plug socket. -Yeah. | 0:07:09 | 0:07:12 | |
And that gives us the opportunity to engage people | 0:07:12 | 0:07:14 | |
and say, "No, there's all these different fossil fuels | 0:07:14 | 0:07:17 | |
"that we have to burn before we can actually consume this resource." | 0:07:17 | 0:07:21 | |
Is a kettle something that even our wonderful, energetic Stonehaven residents | 0:07:21 | 0:07:26 | |
would be able to power with a bicycle? | 0:07:26 | 0:07:29 | |
-I'd like a cup of tea, so... -Are you up for it? | 0:07:29 | 0:07:32 | |
-ALL: -Yes. | 0:07:32 | 0:07:34 | |
Yes? OK, well, I think to be kind to you, | 0:07:34 | 0:07:36 | |
we'll start with just one cup. | 0:07:36 | 0:07:38 | |
One cup of water, Jill. So we'll stick that in a kettle. | 0:07:38 | 0:07:42 | |
The street will need to use their own steam | 0:07:43 | 0:07:46 | |
to get this kettle to a boiling point of 100 degrees Celsius. | 0:07:46 | 0:07:50 | |
One, two, three. Go! | 0:07:50 | 0:07:54 | |
You can do it! | 0:08:02 | 0:08:03 | |
Jill, I want you in here. | 0:08:06 | 0:08:08 | |
How often do you boil your kettle every day, do you think? | 0:08:08 | 0:08:11 | |
Ten, 15 times a day. | 0:08:11 | 0:08:13 | |
-Come on, I'm parched! -Are they ever going to do it? | 0:08:13 | 0:08:16 | |
If everyone in the UK only boiled the water they needed to make a cuppa, | 0:08:19 | 0:08:24 | |
in one year we would have saved enough energy | 0:08:24 | 0:08:27 | |
to power the UK's street lights for two months. | 0:08:27 | 0:08:30 | |
Go on! | 0:08:34 | 0:08:36 | |
94! 95! 96! | 0:08:36 | 0:08:40 | |
98! Final push! Come on! | 0:08:40 | 0:08:43 | |
-Yes! -Yes! It's clicked! You've done it! -Well done, everybody. | 0:08:43 | 0:08:48 | |
12 people pedalling for seven minutes | 0:08:48 | 0:08:51 | |
has resulted in one tiny cup of tea. | 0:08:51 | 0:08:54 | |
It's been a lot of fun, but will it | 0:08:54 | 0:08:57 | |
make Jill think more seriously about her kettle? | 0:08:57 | 0:09:01 | |
Was that a bit of a shocker for you? | 0:09:01 | 0:09:03 | |
It was, really, to see how much energy it actually needs. | 0:09:03 | 0:09:06 | |
Six families are being challenged | 0:09:09 | 0:09:12 | |
to cut their energy use by 30% in just three weeks. | 0:09:12 | 0:09:16 | |
To motivate them, I'm sending them to the town of Lockerbie | 0:09:16 | 0:09:20 | |
to see what's behind | 0:09:20 | 0:09:22 | |
some of the most energy-efficient homes in the country. | 0:09:22 | 0:09:24 | |
It's these houses that we hope are going to inspire our Stonehaven residents. | 0:09:24 | 0:09:29 | |
They're known as "passive houses" | 0:09:29 | 0:09:31 | |
and the best thing for the people who live in them | 0:09:31 | 0:09:35 | |
is that their energy bills are a fraction of the national average. | 0:09:35 | 0:09:39 | |
I can tell you, on average | 0:09:41 | 0:09:44 | |
you're paying over £1,700 for your energy bills a year. | 0:09:44 | 0:09:49 | |
Let's see...what the difference is with the people living here. | 0:09:49 | 0:09:54 | |
So shall we go over? | 0:09:54 | 0:09:57 | |
-Morning, Rosie! -Hello. -ALL: Hello. | 0:09:57 | 0:10:00 | |
-Who lives in this house with you? -There's me and there's three girls with me. | 0:10:00 | 0:10:04 | |
-OK. -Uh-oh! -Three daughters. -ALL LAUGH | 0:10:04 | 0:10:06 | |
So, presumably, that means you've got girls...using hairdryers | 0:10:06 | 0:10:12 | |
and computers and all the regular things. | 0:10:12 | 0:10:15 | |
-Yeah. Yeah, plenty. -Yeah. What about central heating? | 0:10:15 | 0:10:19 | |
-We don't have central heating. -Right. OK. And is it cold in there? | 0:10:19 | 0:10:23 | |
-No, not at all. No, the opposite. -SHE LAUGHS | 0:10:23 | 0:10:26 | |
-Do you believe her? -ALL: No! | 0:10:26 | 0:10:28 | |
SHE LAUGHS | 0:10:28 | 0:10:29 | |
Can I ask you to reveal what you pay a year | 0:10:29 | 0:10:33 | |
for all your energy consumption? | 0:10:33 | 0:10:35 | |
Right, this is all my electricity. | 0:10:35 | 0:10:37 | |
So on top of this, I use some logs but not a lot. | 0:10:37 | 0:10:39 | |
And this is £538 for the whole year. | 0:10:39 | 0:10:43 | |
So we need to find out | 0:10:43 | 0:10:45 | |
-how you can pay, really, a fraction of what these guys are paying. -Uh-huh. | 0:10:45 | 0:10:51 | |
The man to tell us is Thomas Froehlich, | 0:10:51 | 0:10:54 | |
who helped build this low-cost rental housing. | 0:10:54 | 0:10:58 | |
-The house is orientated as much as you can towards the sun...to make use of the sun heating the house. -Right. | 0:10:58 | 0:11:05 | |
They had to be super well-insulated and we have virtually draught-free houses. | 0:11:05 | 0:11:10 | |
And the remainder of the heat in the house is virtually provided by people themselves | 0:11:10 | 0:11:14 | |
-and kettles and... -So the heat is generated | 0:11:14 | 0:11:19 | |
-by Rosie, her three girls and the appliances that she uses. -Uh-huh. | 0:11:19 | 0:11:24 | |
Now that sounds like a heavenly idea. It's brilliant! | 0:11:24 | 0:11:28 | |
-Well, Rosie, if you're brave enough to let in the Stonehaven rabble... -Absolutely. | 0:11:28 | 0:11:32 | |
In you go, guys. Shoes off, please. | 0:11:32 | 0:11:36 | |
On the roof, Rosie has solar panels to heat her water, | 0:11:36 | 0:11:40 | |
and inside there's a log burner that does the same job if there's no sun. | 0:11:40 | 0:11:45 | |
This also acts as a back-up heat source. | 0:11:45 | 0:11:49 | |
-It's lovely and cosy in here, isn't it? -Warm! | 0:11:49 | 0:11:52 | |
Inside Rosie's house it's already 20 degrees. | 0:11:52 | 0:11:55 | |
Let's see if we can warm it up even further. | 0:11:55 | 0:11:58 | |
So all the kids, you're all going to become heat generators. | 0:11:58 | 0:12:04 | |
When I say "go", all the boys are going to run up the stairs, quick as you can. | 0:12:04 | 0:12:08 | |
And then all the girls are going to run down the stairs. Three, two, one. Go! | 0:12:08 | 0:12:13 | |
The children are running up and down, getting hot, | 0:12:16 | 0:12:19 | |
and hopefully increasing the temperature of the house. | 0:12:19 | 0:12:23 | |
To do that it needs to be airtight, so the heat doesn't escape. | 0:12:23 | 0:12:26 | |
Rosie, are there any downsides of having to live in a sort of airtight house? | 0:12:32 | 0:12:38 | |
-Oh, yeah. We can't have a cat flap, actually. -Oh, right. | 0:12:38 | 0:12:40 | |
And same for the letter box, we just have a box on the wall outside the house. | 0:12:40 | 0:12:44 | |
Thomas is there anything practical that any of them, | 0:12:47 | 0:12:51 | |
or indeed anyone, can do to make their house more energy efficient? | 0:12:51 | 0:12:56 | |
Apply insulation on the house, in the roof and all that. | 0:12:56 | 0:12:59 | |
So this must be the first approach because that's the lasting one. | 0:12:59 | 0:13:02 | |
It wouldn't make sense to just put solar panels on the house, | 0:13:02 | 0:13:05 | |
-because you would just replace lost energy with renewable energy. -Right. | 0:13:05 | 0:13:10 | |
And so energy conservation goes before energy creation. | 0:13:10 | 0:13:14 | |
And everyone in the living room. | 0:13:14 | 0:13:16 | |
When we came in the temperature was 20 degrees. | 0:13:19 | 0:13:22 | |
I can now reveal that the temperature has gone up to... | 0:13:24 | 0:13:28 | |
25 degrees. | 0:13:28 | 0:13:30 | |
ALL: Ooh! | 0:13:30 | 0:13:32 | |
-And it has cost Rosie absolutely nothing. -Wow! | 0:13:32 | 0:13:37 | |
-Ta-dah! -ALL LAUGH | 0:13:37 | 0:13:39 | |
We have to charge you now! | 0:13:39 | 0:13:40 | |
The heat we've generated is drawn into these vents in the ceiling. | 0:13:42 | 0:13:47 | |
It then flows into this clever contraption in Rosie's utility room, a heat-recovery system. | 0:13:47 | 0:13:53 | |
The warm air we've generated is used to heat up fresh cooler air coming in from outside. | 0:13:53 | 0:13:59 | |
The fresh warm air can then be circulated into every room in the house. | 0:14:04 | 0:14:08 | |
And all that free heat will continue to be recycled long after we've gone, | 0:14:08 | 0:14:14 | |
because it cannot escape through cracks and gaps in the walls. | 0:14:14 | 0:14:17 | |
On average, well over half the money we spend on fuel bills | 0:14:22 | 0:14:26 | |
goes towards heating our homes and providing hot water. | 0:14:26 | 0:14:30 | |
One way to cut that figure is to | 0:14:34 | 0:14:36 | |
harness the power of the sun. | 0:14:36 | 0:14:37 | |
But this is Stonehaven on the east coast of Scotland. | 0:14:37 | 0:14:41 | |
It's April and its two degrees outside. | 0:14:41 | 0:14:44 | |
Can solar energy make much of an impact here? | 0:14:44 | 0:14:49 | |
Engineering expert, Marty Jopson, has come to show the families on this street | 0:14:49 | 0:14:53 | |
how to make a little bit of sun work hard for them. | 0:14:53 | 0:14:57 | |
What we're going to do is we're going to build a solar air heater. | 0:14:57 | 0:15:02 | |
OK, let's have your cans on the table. | 0:15:02 | 0:15:04 | |
We need to turn all these cans...into a long tube of cans. | 0:15:08 | 0:15:14 | |
So the first thing we need to do is knock holes in the bottom. | 0:15:14 | 0:15:17 | |
And again. | 0:15:17 | 0:15:19 | |
What we're going to do is we're going to glue these all together and make a long tube. | 0:15:25 | 0:15:29 | |
Right so that'll take a while to dry, but what we have to do next... | 0:15:34 | 0:15:37 | |
-Paint it! -Is paint it, exactly. -Whoo-hoo! -Cos it has to be... | 0:15:37 | 0:15:40 | |
What we want is we want it to be | 0:15:40 | 0:15:41 | |
completely matt black, so it will | 0:15:41 | 0:15:43 | |
trap as much heat as possible. | 0:15:43 | 0:15:45 | |
Whilst that's drying, do you want to come in and I'll show you what we've got inside? | 0:15:51 | 0:15:55 | |
-ALL: Whoo! -Yes, lots of cans. | 0:15:58 | 0:16:01 | |
The black cans absorb the light and the heat from the sun. | 0:16:01 | 0:16:06 | |
The heat travels to the inside of the cans by conduction, where it warms the air. | 0:16:06 | 0:16:11 | |
Convection causes the air to rise through the metal cans, | 0:16:11 | 0:16:15 | |
bringing cool air in from the bottom to be heated. | 0:16:15 | 0:16:19 | |
This free heated air is then fed to the house. | 0:16:19 | 0:16:22 | |
So, there you go, all finished. | 0:16:29 | 0:16:31 | |
MUSIC: "Walking On Sunshine" by Katrina & The Waves | 0:16:31 | 0:16:35 | |
We've got a bit of sun, so...I'm hopeful. | 0:16:36 | 0:16:39 | |
The temperature out here is currently...six degrees. | 0:16:44 | 0:16:47 | |
-Wow! Sub-tropical(!) -Yeah, exactly. | 0:16:47 | 0:16:50 | |
What do you reckon the temperature in here has got to? | 0:16:50 | 0:16:53 | |
-What do you reckon? -12. -12 degrees. | 0:16:53 | 0:16:55 | |
-It has got to 76.6 degrees centigrade. -Wow! | 0:16:55 | 0:17:01 | |
-Is that hot? -OK, that's just up here right at the top. -That is amazing! | 0:17:01 | 0:17:05 | |
And rising as we speak. It's ferociously hot up here. | 0:17:05 | 0:17:08 | |
So I'm going to send half of you indoors and we'll give you a walkie-talkie | 0:17:08 | 0:17:12 | |
and you can then relay the temperature to us. | 0:17:12 | 0:17:15 | |
Oh, wow! It's amazing! It's really hot, girls. | 0:17:18 | 0:17:22 | |
This is, what, 80 degrees, something like that. | 0:17:22 | 0:17:24 | |
In there they're getting 27-30 degrees. | 0:17:24 | 0:17:27 | |
-What do you reckon? -This is great. | 0:17:27 | 0:17:29 | |
It's free...and it's working a lot better than I thought it was going to work. | 0:17:29 | 0:17:32 | |
The sun is not the only free source of energy, | 0:17:37 | 0:17:40 | |
wind is another natural resource that can be harnessed to power appliances. | 0:17:40 | 0:17:45 | |
Engineering expert, Marty Jopson, wants to show the families how this can be done. | 0:17:45 | 0:17:50 | |
So, what we're going to do is we're going to make a wind turbine. | 0:17:50 | 0:17:53 | |
And I thought we would try and power something | 0:17:53 | 0:17:58 | |
fairly straightforward and simple like a blender. | 0:17:58 | 0:18:01 | |
We're going to use a bike wheel, right? | 0:18:01 | 0:18:04 | |
This is just an ordinary wheel off a bicycle. | 0:18:04 | 0:18:06 | |
And we can turn this into a wind turbine | 0:18:06 | 0:18:10 | |
with the aid of a bit of tape. That's all we need. | 0:18:10 | 0:18:13 | |
Over. Over. | 0:18:19 | 0:18:21 | |
Over. | 0:18:21 | 0:18:22 | |
-Well done. -ALL: Whoo-hoo! | 0:18:25 | 0:18:28 | |
That's our wind turbine. | 0:18:28 | 0:18:31 | |
And that should do the job. | 0:18:31 | 0:18:33 | |
Marty is connecting the home-made wind turbine to the blender | 0:18:33 | 0:18:37 | |
using a bicycle chain and gears. | 0:18:37 | 0:18:40 | |
It's fixed to a wooden post, so that it sits up high to catch the wind. | 0:18:40 | 0:18:45 | |
So the wind turns this, turns the chain, chain turns that... | 0:18:45 | 0:18:49 | |
90 degrees into our mixer. | 0:18:49 | 0:18:53 | |
We're going to take this down to the beach. There's good wind on the beach, | 0:18:53 | 0:18:56 | |
cos it's uninterrupted coming off the sea. Who wants a milkshake? | 0:18:56 | 0:18:59 | |
ALL: Me! | 0:18:59 | 0:19:00 | |
Come on, then, let's go down the beach. | 0:19:00 | 0:19:02 | |
The wind has got what's known as kinetic energy, right, | 0:19:09 | 0:19:12 | |
so this is the energy of movement. | 0:19:12 | 0:19:15 | |
So some of the kinetic energy of the wind | 0:19:15 | 0:19:17 | |
is turned into rotational kinetic energy of the wheel, | 0:19:17 | 0:19:20 | |
which moves the chains and we get kinetic energy through to here from here. | 0:19:20 | 0:19:24 | |
So we're capturing that kinetic energy. | 0:19:24 | 0:19:26 | |
The wheel's spinning round, but at the moment there's no load on it. | 0:19:26 | 0:19:29 | |
So we've not attached the chain yet, that's the next thing, | 0:19:29 | 0:19:32 | |
and the question is, will it spin with the chain on? | 0:19:32 | 0:19:34 | |
-Probably not. -Right, shall we hook it up? | 0:19:34 | 0:19:37 | |
Blow! | 0:19:47 | 0:19:49 | |
ALL CHEER | 0:19:52 | 0:19:54 | |
It's picking up speed. | 0:19:59 | 0:20:02 | |
Well, it's turning! | 0:20:02 | 0:20:04 | |
So, let's just see what the wind speed is that we've actually got. | 0:20:05 | 0:20:08 | |
About...10mph wind here. | 0:20:08 | 0:20:12 | |
-Even we can blow faster than that. -Exactly, even we can blow faster than this. | 0:20:12 | 0:20:15 | |
I have a cunning plan. | 0:20:16 | 0:20:19 | |
Stand back! Stand back. | 0:20:19 | 0:20:20 | |
ALL LAUGH | 0:20:20 | 0:20:24 | |
CHEERING Are we getting...? | 0:20:32 | 0:20:35 | |
Who wants a milkshake? | 0:20:35 | 0:20:37 | |
ALL: Me! | 0:20:37 | 0:20:39 | |
So, I think what this has proven is that if you want to run a 350-watt blender, | 0:20:43 | 0:20:50 | |
you need more wind...even than this and a much bigger wind turbine. | 0:20:50 | 0:20:56 | |
With just three weeks to slice a massive 30% off their energy consumption, | 0:20:58 | 0:21:04 | |
the families in this street need all the help they can get. | 0:21:04 | 0:21:08 | |
Energy expert, Lucy Conway, is on her way to offer some tips. | 0:21:08 | 0:21:13 | |
Jill loves her big wooden floors, | 0:21:13 | 0:21:16 | |
but because there's uninsulated concrete underneath, | 0:21:16 | 0:21:19 | |
valuable heat is being lost through conduction. | 0:21:19 | 0:21:23 | |
The average is round about ten to 15% heat loss through the floor. | 0:21:23 | 0:21:26 | |
Your floor could lose about 35% of the heat. | 0:21:26 | 0:21:29 | |
When we get visitors, we always say | 0:21:29 | 0:21:31 | |
bring your slippers because the floors are cold. | 0:21:31 | 0:21:33 | |
This little gizmo measures the temperature of...anything you point it at, really. | 0:21:35 | 0:21:40 | |
The floor is 18.6 degrees centigrade. | 0:21:40 | 0:21:44 | |
If we point it at the rug... | 0:21:44 | 0:21:46 | |
ALL LAUGH | 0:21:46 | 0:21:48 | |
..you get 19.6. | 0:21:48 | 0:21:49 | |
So it's a degree warmer on the rug than it is on the floor. | 0:21:49 | 0:21:54 | |
Lucy has a plan to solve the problem of Jill's chilly floors. | 0:21:54 | 0:21:58 | |
Ta-dah! | 0:21:58 | 0:22:00 | |
-Carpets. -Carpets, indeed. | 0:22:00 | 0:22:02 | |
So can you give me a hand bringing these into the living room? | 0:22:02 | 0:22:05 | |
-What do you think your mum will make of these? -They won't go with her lounge. | 0:22:05 | 0:22:09 | |
They won't go with her lounge. Oh, no! | 0:22:09 | 0:22:11 | |
-That looks absolutely awful now. -LAUGHTER | 0:22:20 | 0:22:23 | |
It's not my taste at all. | 0:22:23 | 0:22:25 | |
You will save between four and six percent on your energy bills just by having rugs down. | 0:22:25 | 0:22:30 | |
I'll keep them down to see if it helps... | 0:22:30 | 0:22:32 | |
-for the rest of the challenge. -We'll see how it goes for the rest of the week. | 0:22:32 | 0:22:36 | |
-It's increased the floor temperature by over a degree already. -Yeah. | 0:22:36 | 0:22:40 | |
Others on the street are also discovering how important it is to prevent heat loss. | 0:22:41 | 0:22:47 | |
We all realised pretty quick that insulation was the way to go. | 0:22:47 | 0:22:50 | |
It's nice and cheap and it can be quick. | 0:22:50 | 0:22:52 | |
So I've been working my way round the house insulating things and the next one is the loft hatch. | 0:22:52 | 0:22:59 | |
Effective draught proofing around windows and doors can save around £30 per year. | 0:23:02 | 0:23:08 | |
Norman's hot water tank is uninsulated, | 0:23:09 | 0:23:12 | |
which means it's losing valuable heat every day. | 0:23:12 | 0:23:16 | |
-Right, this is the hot water jacket, which costs about £10... -OK. | 0:23:17 | 0:23:23 | |
..and will save you about £50 a year. | 0:23:23 | 0:23:25 | |
It reduces the heat loss by 75%. | 0:23:28 | 0:23:31 | |
I didn't realise it would save you so much money. Just something so simple and so cheap. | 0:23:34 | 0:23:39 | |
Poor insulation causes needless energy waste. | 0:23:39 | 0:23:43 | |
These are the approximate savings | 0:23:43 | 0:23:45 | |
that could be made per year with improved insulation. | 0:23:45 | 0:23:48 | |
A grand total of £560, | 0:23:49 | 0:23:53 | |
which is over a third of the average annual UK household energy bill. | 0:23:53 | 0:23:58 | |
However, you do have to take into account how much it costs | 0:23:58 | 0:24:01 | |
to install these measures in the first place. | 0:24:01 | 0:24:04 | |
Reducing heat loss is one way to cut down on energy use, | 0:24:06 | 0:24:10 | |
but it's not the only way. | 0:24:10 | 0:24:12 | |
I got a marker pen and I measured two cups, | 0:24:12 | 0:24:15 | |
cos it's only Peter and I that actually have a cup of tea or coffee. | 0:24:15 | 0:24:19 | |
-But I'm quite impressed with my little mark. -I'm very impressed. | 0:24:19 | 0:24:22 | |
Now Jill is only using the energy she needs to boil the kettle. | 0:24:22 | 0:24:27 | |
Bill and Mi Yong also need tips on how to save energy. | 0:24:27 | 0:24:32 | |
So how about moving the telly | 0:24:32 | 0:24:34 | |
to make this beautiful light room even lighter. | 0:24:34 | 0:24:37 | |
-That's free energy from the sun. -Yeah. | 0:24:37 | 0:24:40 | |
I'm quite happy not having TV down here at all. | 0:24:40 | 0:24:43 | |
-Now there's a radical idea, Bill. -It's not just the TV, | 0:24:43 | 0:24:46 | |
it's the stereo system and the sub-woofer and everything else. | 0:24:46 | 0:24:49 | |
It took me ages to set this up! | 0:24:49 | 0:24:52 | |
Lucy's off to see how Sheila's changing her energy habits. | 0:24:52 | 0:24:57 | |
Before the challenge started, we had the thermostat set to between 21 and 22, | 0:24:57 | 0:25:03 | |
so it's now between 18 and 19. | 0:25:03 | 0:25:06 | |
Turning down the thermostat by just one degree can save around £65 pounds a year. | 0:25:06 | 0:25:12 | |
However, Sheila needs to do more than just turn down her thermostat. | 0:25:12 | 0:25:17 | |
This is a household that loves a long shower. | 0:25:18 | 0:25:23 | |
Lucy's got some tips to save water and money. | 0:25:23 | 0:25:27 | |
So the plan is we're going to fill this bucket | 0:25:27 | 0:25:29 | |
-and see how many litres it takes in a minute. -OK. | 0:25:29 | 0:25:32 | |
-So each line here is a litre. -OK. -So we can work out | 0:25:32 | 0:25:36 | |
-how much water you're using in a minute in the shower. -OK. Interesting. | 0:25:36 | 0:25:41 | |
-And then we can work out how much energy that is. -Right. -OK? -OK. | 0:25:41 | 0:25:45 | |
Go! | 0:25:45 | 0:25:47 | |
Three, two, one. | 0:25:51 | 0:25:54 | |
-BEEPING -Oh! | 0:25:54 | 0:25:56 | |
-So I think that's about five litres of water in a minute. -Uh-huh. | 0:25:56 | 0:26:00 | |
The bad news is if you were to have a 32-minute shower, | 0:26:00 | 0:26:04 | |
which I believe somebody in this household did the other day, | 0:26:04 | 0:26:07 | |
-that would be 160 litres. -That's a huge amount. | 0:26:07 | 0:26:11 | |
-It's two bathfuls. -Oh, is it? | 0:26:11 | 0:26:13 | |
If two people take showers that last 32 minutes every day, | 0:26:13 | 0:26:18 | |
over the course of a year the pennies soon add up. | 0:26:18 | 0:26:21 | |
-£467.20. -Really?! Just for showers? | 0:26:21 | 0:26:26 | |
Just for two showers, two 32-minute showers a day. | 0:26:26 | 0:26:30 | |
-Oh, dear! We need to do something. -BOTH LAUGH | 0:26:30 | 0:26:32 | |
Absolutely. | 0:26:32 | 0:26:34 | |
Lucy's leaving Sheila with a shower timer, which will help her make the savings she needs. | 0:26:34 | 0:26:40 | |
Next, she's back to see Norman about his fridges. | 0:26:41 | 0:26:45 | |
Pop a piece of paper in like that. | 0:26:45 | 0:26:47 | |
And if you can pull the paper out that easily, | 0:26:47 | 0:26:50 | |
then your seals aren't working properly. | 0:26:50 | 0:26:52 | |
-OK. -So have a look at your seals. | 0:26:52 | 0:26:55 | |
You may find they just need cleaning, or you can get replacement seals. | 0:26:55 | 0:26:58 | |
Loose seals mean lost energy...and money. | 0:26:58 | 0:27:02 | |
Before she leaves, Lucy's making one last visit to Bill and Mi Yong's | 0:27:03 | 0:27:07 | |
to see if they've been persuaded to move their huge telly away from the window. | 0:27:07 | 0:27:12 | |
-Hello! You've got a very different living room. -Yes, it is. -Look at this! It's amazing! | 0:27:12 | 0:27:18 | |
It is, isn't it? | 0:27:18 | 0:27:20 | |
So you've moved the telly and you've pulled up the blinds. What's it like? | 0:27:20 | 0:27:25 | |
Wonderful! Marvellous! | 0:27:25 | 0:27:28 | |
When your blinds were down and the window was full of television, | 0:27:28 | 0:27:31 | |
you were losing 70% of all that free, sunny solar heat | 0:27:31 | 0:27:36 | |
that was coming into your living room. | 0:27:36 | 0:27:38 | |
-When you think about it now... -How stupid was it? | 0:27:38 | 0:27:41 | |
-Does it sound really stupid? -Yeah. | 0:27:41 | 0:27:44 | |
It's results day. | 0:27:45 | 0:27:46 | |
Time for energy and sustainability expert, Dr Alan Owen, | 0:27:46 | 0:27:50 | |
to reveal if the families have managed to cut | 0:27:50 | 0:27:53 | |
the amount of gas and electricity they use by 30% and save money. | 0:27:53 | 0:27:58 | |
So, this is it...the results are in. | 0:28:00 | 0:28:03 | |
Alan, do you want to tell us how the whole street did? | 0:28:03 | 0:28:07 | |
The whole street achieved a saving between them | 0:28:07 | 0:28:11 | |
of 49.8%. | 0:28:11 | 0:28:13 | |
ALL CHEER | 0:28:13 | 0:28:14 | |
49.8%?! | 0:28:14 | 0:28:17 | |
Nearly 50%! | 0:28:17 | 0:28:20 | |
That is incredible! | 0:28:20 | 0:28:22 | |
So your challenge was to save 30%. You have absolutely blitzed that! | 0:28:22 | 0:28:29 | |
I think a huge round of applause. | 0:28:29 | 0:28:32 | |
APPLAUSE | 0:28:32 | 0:28:35 | |
Subtitles by Red Bee Media Ltd | 0:28:44 | 0:28:47 |