"Commander Kinsey" wrote in message
news
p.z908xwllwdg98l@glass...
On Mon, 21 Oct 2019 23:23:19 +0100, alan_m wrote:
On 21/10/2019 20:50, A noiseless patient Spider wrote:
On 10/21/2019 3:20 PM, Commander Kinsey wrote:
Why can't I find a heat pump with a good SEER rating? The USA has a
law stating 13 minimum. Yet here in the UK, I looked at Panasonic and
they're all 7 to 11!
It's because we use 120/240 volt 60 Hz two-phase. Your single-phase 50
Hz is less efficient.
https://www.energystar.gov/products/...rce_heat_pumps
Doesn't it also depend on if it's been optimised for air conditioning to
cool air in the summer rather than being optimised for heating during
the winter in climates such as the UK?
Is that necessary?
For the best SEER rating, yep.
If it's reversible, isn't it just that?
Nope. The problem with using them for heating
in a climate like yours is that the outside heat
collector does ice up and you need a much
bigger outside heat absorber to get the best
SEER rating for winter heating.
You don't get that effect with summer aircons.
Obviously it will be less efficient when it's pushing heat through a
larger gradient (which will happen in heating mode), but that can't be
helped.
It can actually with two stage designs.
Consider also it appears from many of the examples I've seen honesty
doesn't seem to be part of USA advertising.
Don't they have a government body to check they're honest?
Nope.
And it ain't just the USA - almost everything you buy with a rating is a
lie.
Not a lie so much as its hard to come up with a single digit number
that really does rank the devices properly, even with something as
simple as a fridge or freezer, let alone a heat pump.
Cameras with less megapixels than they say,
That's not a rating, that's a lie about the specs.
batteries with less capacity than they say, etc.
Ditto. But that doesn't happen with the best of them like
the Panasonic Li ion batterys or the apple iphone batterys
Its more complicated with smartphone talk time which
varys quite a bit depending on whether you are in a
strong signal area or a weak one where the phone
need to transmit more power to be seen by the base.
Every time I buy something like that, I test it thoroughly, then get a
partial refund :-)
You don't with Panasonic Li ion batterys.