On Tue, 22 Oct 2019 00:54:32 +0100, trader_4 wrote:

On Monday, October 21, 2019 at 7:46:27 PM UTC-4, Commander Kinsey wrote:
On Tue, 22 Oct 2019 00:18:44 +0100, wrote:

On Mon, 21 Oct 2019 22:15:15 +0100, "Commander Kinsey"
wrote:

On Mon, 21 Oct 2019 21:59:03 +0100, Robert wrote:

On 21/10/2019 20:54, Rod Speed wrote:
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!

https://en.wikipedia.org/wiki/Season...ficiency_ratio
Which suggests that the seasonal weighting parameters used in the US ,
Europe and possibly UK are all different which will give very different
figures.

Surely all SEER are the same, all EER are the same, and all COP are the same?

From Wikipedia
"In the United Kingdom, a Seasonal Energy Efficiency ratio (SEER) for
refrigeration and air conditioning products, similar to the ESEER but
with different load profile weighting factors, is used for part of the
Building Regulations Part L calculations within the Simplified
Building Energy Model (SBEM) software, and are used in the production
of Energy Performance Certificates (EPC) for new buildings within the
UK and the European Union; both as part of the European directive on
the energy performance of buildings (EPBD"

Since most of this stuff comes from China anyway I would be surprised
it is that much different if at all. This really might just be the way
they get rated in UK. I know most HVAC people say that SEER thing is
bull**** anyway as soon as they get away from the salesman..

This website claims that SEER is always measured the same, assuming a certain temperature range:

https://asm-air.com/airconditioning/...r-what-is-eer/

"SEER can be misleading. What people often dont realize is that SEER is a ratio that only applies to a very specific set of test parameters which cover a pre-set temperature range. The problem with this is that when SEER is calculated it is calculated across the same universal range, regardless of where the person who is purchasing the air conditioner lives.

Ask yourself, when was the last time that it was 65 degrees in the summer if you live in Santa Clarita, California? Probably a lot less likely than if you live in Lake Arrowhead or worse yet, Seattle, Washington. So although SEER is a universal measure of efficiency, it can be misleading in the sense that the average temperature range in Santa Clarita is far different from the average summer temperatures in Bozeman, Montana, but yet the same SEER rating would be on the tag in each."

OK, so suppose we have a system that's rated 13 SEER and we run it in
Santa Clarita CA and we run it in Seattle. We run an 18 SEER system
in both of those locations too. Show us where the 18 SEER system
doesn't use less energy for the amount of heat moved in both.

Well I would have thought the 18 unit would be 18/13 times more efficient. But perhaps some units cope better with different temperatures, so one unit produces 9-18 SEER depending on the weather, and the other 11-13 SEER. If you're in a difficult climate, the other might become better.