still need answer please

[bomjac]

My point is that by far the largest source of power used is the dishwater and tumbledryer. 3kg of wet clothes takes the same amount of power to dry at 248V as it does at 230V, so there is no saving there, it will just take slightly longer at the lower volts. Likewise the dishwasher, which uses the power mainly to heat the water and dry the dishes afterwards. Again no savings to be made there.

The only obvious place for me to see savings would be on the lighting, which is not enough to justify the outlay for an optimiser.

Now on the other hand, if I was to hook up a miniature pelton turbine to the mains water at home (no water meters where I am), I wonder how much that would generate

 

[ackbarthestar]

My point is that by far the largest source of power used is the dishwater and tumbledryer. 3kg of wet clothes takes the same amount of power to dry at 248V as it does at 230V, so there is no saving there, it will just take slightly longer at the lower volts. Likewise the dishwasher, which uses the power mainly to heat the water and dry the dishes afterwards. Again no savings to be made there.

I think it is more a case of terminology.
A lower supply voltage will produce a proportionately lower power output, but to dry a fixed weight of whatever will take longer and so use the same amount of energy. Remember, your electric meter is an energy meter not a power meter so cannot record the rate of doing work only the total work achieved.
Since the timing cycle is controlled by the frequency of the supply. Your washing or dishes are less likely to be dry by the end of the timed cycle.

 

[SPARTYKUS]

Maybe, but 3kW is 3kW no matter what voltage it is on, the biggest consumers in my house are the Tumble dryer, the Dishwasher, washing machine and oven. Nothing to be gained from these by voltage optimisation. Living room and dining room have 6*50W halogens on dimmers between them, all other bulbs are miniature fluorescents or LED's, so I think I shall just have to live with replacing the G9's when they blow.

Thats a big culprit in many houses. Alot of things can be cooked in a microwave far more cheaply. Although it's hard to convert.

I have just invested in a load of 4W LED lights, to replace the 25 GU10 halogens dotted about my house. I hope it may nullify the energy price increase this year

 

[Knobhead]

Thats a big culprit in many houses. Alot of things can be cooked in a microwave far more cheaply. Although it's hard to convert.

Oh No!
Don’t start that argument please.
Another board I’m a member of the question was asked, “Is it better to heat a cupful of water in a microwave or in a kettle?”
350 posts by engineers from around the globe and we were still no wiser!
37000 post on “How to break a bath” was also a good one. It went off topic a bit.

 

[SPARTYKUS]

Oh No!
Don’t start that argument please.
Another board I’m a member of the question was asked, “Is it better to heat a cupful of water in a microwave or in a kettle?”
350 posts by engineers from around the globe and we were still no wiser!
37000 post on “How to break a bath” was also a good one. It went off topic a bit.

Okay I won't! But the heating a cup of water question is obvious

 

[MDJ]

Better to heat it in a kettle, heating it in the microwave will burn your fingers on the mug when you try to take it out :44:

 

[Silly Sausage]

I found with microwaving a mug of water, it explodes when you put the tea bag in and you're left with hardly any water.

 

[SPARTYKUS]

How to break a bath- cast iron I assume- lump hammer and ear defenders. And thick gloves

 

[Silly Sausage]

Oh No!
Don’t start that argument please.
Another board I’m a member of the question was asked, “Is it better to heat a cupful of water in a microwave or in a kettle?”
350 posts by engineers from around the globe and we were still no wiser!
37000 post on “How to break a bath” was also a good one. It went off topic a bit.

And don't forget the classic 'Will an aeroplane on a conveyor belt take off?'
Aaarggh!

 

[Knobhead]

And don't forget the classic 'Will an aeroplane on a conveyor belt take off?'
Aaarggh!

No, the tyres will explode due to centrifugal force caused by overspeed!

 

[Knobhead]

Bloody long conveyor mind!

 

[SPARTYKUS]

No, the tyres will explode due to centrifugal force caused by overspeed!

centripetal?

 

[Knobhead]

Hang on!
If the conveyor is runnind in the direction of take off then no problem.

Still want to see this conveyor though.

 

[ackbarthestar]

Wouldn't you need to be running at take off speed plus conveyor speed before you would sustain a complete/successful lift-off ?

How long is this conveyor?

 

[electric will]

yes it will take off cus the plane is pushed forwards due to the propellers acting against the air so the plane accelerates as normal,