On Wed, 1 Aug 2018 11:16:22 +0100, The Natural Philosopher
wrote:

On 01/08/18 11:08, Dave Liquorice wrote:

Of course any demand management is more to do with clipping the peak
off the early evening winter peak deamnd. By knocking 500 MW of that
you can "save" a whole power station being required but sit idle for
the vast majority of the year.

500 MW, how many fridges is that?

Lets assume that when the compressor is running a fridge takes 100W.
500,000,000 / 100 = 5,000,000 fridges, hum a lot...

BUT a fridge doesn't run it's compressor all the time. Lets assume a
20% duty cycle. That means to save 100 W on average you need to
control 5 fridges. 5,000,000 * 5 = 25 million fridges, thats more
than the number of households in the country...

It ain't going to happen any time soon.


Think a fridge compressors takes more than that. 100-200W is AVERAGE and
up to 1Kw AVERAGE for big fridges and freezers.

So you can get there with only 5 million fridges

I think you're living in the past.

Our fridge (big, full height one) consumes about 65W for 8 minutes in
every 40 minutes. True there's a spike to about 750W as the compressor
starts, but that's only a second or so.

The upright freezer which is a bit bigger consumes about 32W for 40
minutes every 105 minutes.

Chest freezer consumes about 60W for 18 minutes every hour.

Any appliance that's modern enough to be switchable remotely should
have similarly low consumption.

Can't see switching appliances like these off remotely achieving
anything.