I think the new ones are profitable for the manufacturers, too.
I assume more expensive too - with energy prices up, the math just
says it's worth spending a few more bucks up front to save energy for
X years. Times change, optimal design decisions change.
And there is simply better tech, better insulating materials, better
thermostats, better electronic motor controls, more precise machining
of compressor parts, better engineering of airflow within, etc. Just
making some of the heat exchanger elements 5% larger can increase
efficiency, it doesn't have to be rocket science.
It is mostly in the electric motors which are used for the compressor and
Actually house electricity is not very "efficient" for running an electric
motor. So what they do is make their "own electricity" to run the electric
motors. Then design the most efficient electricity/motor pair.
For example electric motors run more efficiently on 3 phase electricity,
they may convert the house electricity to a form of 3 phase electricity for
the electric motors.
Or they can control the "speed" of the electric motors. Rather than on full
blast or off, they can run these are various speeds. If just a little
cooling is needed, slower speeds will do the job.
They basically put their thinking caps on and come up with ANYTHING which
will save a bit of energy. With modern electronics and computer control, all
sorts of things are now possible...
Here is one which says...
"Daikin's Reluctance DC motors utilize powerful neodymium magnets that are
10 times more powerful than conventional magnets. By maximizing torque,
Daikin's reluctance DC motors can boost efficiencies 20% higher than
This one says...
"Regular A/C units have a compressor that switches on whenever the room gets
too warm and runs at full power until the room is cool enough, then shuts
off. The inverter makes it possible to run the compressor continually at a
lower power to maintain the room temperature eliminating the frequent
stopping and starting required by standard systems ."
On "Variable Frequency Drives"...
Variable Frequency Drive Technology Can Save Over 30% In Energy Costs...
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