How effecient is a freezer?

Question

The energy labels are rubbish, i want to know in a %.

Ie how much energy if actually used, like a car is 30% efficent and a lightbulb is 10% useful energy.

Answer 1

AND spare a thought for the fellow who turns the light on when you open the door?

Answer 2

Depends on whether it is empty or full, just like a fridge. If you fill it it is more efficient. Otherwise it is simply keeping empty space cool.

Answer 3

the energy rating labels are generally accurate, you can buy a watt meter to work out how much it uses over 12 hours because freezers fluctuate all the time through different cycles.

% of what are you trying to work out?

Yes 10% of a lightbulb is actual useful light but you need to run it at 100% to get the 10% light out of it.

Unless you are actually comparing it to something you cant get a % efficency.

Eg. My laptop is 50w

Macs are 25w

Therefore my laptop is 50% more efficent.

I cant say my laptop is eg. 75% energy efficent unless I know where all the excess heat is going and how to run a laptop that is 100% efficent that wouldnt use any energy and be able to copare the two.

Work out yearly energy rate (should say it on label), trust major brands energy labels better and do a comparison and that is the best you can do unless you get it independantly tested or you test it yourself over 12 hours.

Answer 4

It depends on multiple factors such as size, insulation and ambient temperature. Also, how you use it - if its opened often or only occasionally. From the EU labels you can work out what you are asking if you think about it.The labels show how much electricity is used under standard operating conditions, measured in kWh / year "kilowatt hours" for refrigeration or kWh/cycle for washing and other appliances.

You can work out the average annual running cost and saving by multiplying the KWh consumption figure by the average unit price of electricity.

Answer 5

Freezers just move heat around. You can't express that in efficiency %. A 100% efficient freezer would use zero energy. 0% would use infinite energy.