Re: Suspension losses

Am Mon, 13 Jan 2025 11:03:03 -0500 schrieb Frank Krygowski
<frkrygow@sbcglobal.net>:

On 1/13/2025 8:57 AM, zen cycle wrote:

On 1/13/2025 2:01 AM, Jeff Liebermann wrote:

On Mon, 13 Jan 2025 13:20:04 +0700, John B. <slocombjb@gmail.com>
wrote:
>

But long before the days of transistors and "circuit boards" my folks
had an electric blanket... used it all the rest of their lives. Is the
modern one better?

>
Not really better, but certainly safer.  Electric heaters are all 100%
efficient.  Every watt you shove into the heating wires is turned into
heat.  There's no way to improve on 100% efficiency.

 
Nothing is 100% efficient

>
It's certainly true that 100% of the electricity consumed by an electric
blanket becomes heat.

But that 100% isn't efficiency, it's just a raw conversion rate for
Electricity to heat in an isolated blanket.

You, as a person, don't need or consume heat. Somewhat simplified, you
need a certain range of temperatures.  In the ideal case, you don't need
any additional energy, because your body already produces heat. A little
bit of isolation, perhaps provided by that very blanket, might be
sufficient.  Actually, getting rid of that heat can become difficult,
and this is getting worse, over time.

>
I've always had a mindset for minimizing waste. For most of my life I
was diligent about shutting off the light switch when leaving a room.
But now I often don't bother, especially in winter. LEDs draw so much
less electricity anyway, and in the winter the "waste" just amounts to
electric heat.

On the other hand, producing LED generates waste too and many LED lamps
aren't as long lived as the packing says.  Especially LED lights
compatible to former light bulb are prone to early failures, because te
base doesn't provide enough space for reliable electronics. So
overheating the electronics and undersized capacitors might kill some
older and/or cheap LED bulbs almost as fast as the incandescent bulbs of
the past that got replaced. It has gotten better over time though, so
this is no argument for bulbs that only convert 5-10% of electric energy
to light.  But it is an argument not to waste light and so cancel out
the benefit.

->
<https://www.sciencedirect.com/science/article/abs/pii/S0301421514002638>

"A brighter future? Quantifying the rebound effect in energy efficient
lighting"

<https://www.arquiled.com/en/avoiding-the-rebound-effect-when-transitioning-to-led/>

"In Portugal, the average amount of light has risen 120% in the last
five years. It is urgent to prevent the energy savings associated with
the transition to LED from being offset by unnecessary lighting"

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