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4. Crush Your Beer Fridge
CRUSH YOUR BEER FRIDGE
08/16/2022
Driving Motors
Energy Efficiency Standards
LED Lighting
So, you finally decided to replace the old refrigerator that came with the house
when you bought it. The shiny new stainless-steel fridge instantly gave your
kitchen a modern look, and you wondered why you hadn’t done it earlier. However,
when it came time to say goodbye to the 20-year-old fridge that got you through
the first few years of homeownership, you became a little sentimental. “It’s my
first fridge, and it works perfectly fine!”
Then you did what your parents had done before you. You retired the old fridge
into the garage. “This way, I will always have a six-pack chilled and ready for
gametime on Sundays,” you told yourself. “And I’ll have enough freezer space for
the value-pack pork chops when they go on sale.”
What you didn’t know is that old refrigerators consume a lot more electricity
than the highly efficient models available today. Do a quick calculation, and
you would find that you would have been better off buying a second energy-saving
fridge to keep than running that old energy gobbler in your garage.
THE COST OF KEEPING YOUR OLD FRIDGE
Based on the Flip Your Fridge Calculator provided by ENERGY STAR®, a typical
top-freezer refrigerator made before 1980 uses 2,180 kWh of electricity per
year, compared to 1,031 kWh for a turn-of-the-century model. Today’s new ENERGY
STAR certified refrigerators, on the other hand, only use 430 kWh a year!
Let’s do the math:
Model YearAnnual Energy
ConsumptionAnnual Cost
U.S. Rate: $0.12/kWh
CA Rate: $0.20/kWh Annual SavingPayback Period
(To buy a $777 new fridge)Or in Free Beers
($20 per 24-can case)19802,180 kWhUS: $261.60
CA: $436.00$210.00
$350.003.7 Years
2.2 Years252 Cans
420 Cans19901,539 kWhUS: $184.68
CA: $307.80 $133.08
$221.805.8 Years
3.5 Years160 Cans
266 Cans20001,031 kWhUS: $123.72
CA: $206.20 $72.12
$120.2010.8 Years
6.5 Years87 Cans
144 Cans2019430 kWhUS: $51.60
CA: $86.00 -
--
--
-
As you can see, replacing an ancient 1980s refrigerator saves you enough money
to pay off a new one in less than four years! Even an early 2000s model wastes
an entire new fridge’s worth of electricity in just 6.5 years in states with
high energy rates, like California.
If we translate that into beers, someone in California who replaces a 1980s
fridge can save enough money in a year to buy 420 cans of beer. That’s more than
one free beer a day and two on Sundays!
According to this 2016 CNN article, almost a quarter of American homes have two
or more refrigerators. And ENERGY STAR says if all refrigerators older than 15
years were replaced with ENERGY STAR certified ones, Americans would save more
than $330 million a year in addition to 5.5 billion pounds of greenhouse gas
emissions.
REFRIGERATORS KEEP GETTING CHEAPER AND MORE EFFICIENT
First introduced in 1913, the home electric refrigerator reached its peak of
energy consumption in the 1970s, when the energy crisis led to California
establishing the first-ever efficiency standards for refrigerators, followed by
national legislations adopted in 1987. Since then, the price and energy usage of
refrigerators have gone down dramatically while volume has increased, as
demonstrated by this Appliance Standards Awareness Project graphic.
Key technological developments that led to greater energy savings include better
insulation, more precise temperature control and defrost mechanisms, as well as
high-efficiency compressors that generate less heat and noise.
NEW CHALLENGES REQUIRE NEW INNOVATIONS
In recent years, the smart home revolution has led to a raft of new features
being added to refrigerators. Many new models have connectivity features, voice
recognition or even a sizeable touch screen on the door. Powering these features
require the refrigerator’s power supply to deliver high current while
maintaining high efficiency at both full load and light load.
A good design example for that use case is DER-868 from Power Integrations. This
60 W flyback power supply utilizes a PowiGaN-based InnoSwitch3-EP switcher IC.
Its 5 A output current can support refrigerators featuring DC motors, ice makers
and LED touch screens. It reaches over 90% efficiency at 10% load and 93%
efficiency at full load.
Now that the math is clear, there is only one thing left to do. Crush your old
beer fridge!
Just kidding. Don't throw it in the field. Recycle, please.
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