Want to have a fridge that consumes only 0.1kwh a day?
October 13, 2006 by Noel
Filed under Green Living
One guy from down under converted a chest freezer into a fridge and consumes only 0.1kwh a day!
Yes that’s only 100 watt-hours a day. Do you know how much this consumes in 1 hour? Lets compute, 100watts-hours in a day / 24 hours = 4.16 watt-hour. Just like running a 4.16 watt lightbulb continuously. Now that’s savings!!
Forget those energy stars that you see when you buy a fridge. This one is about 10 to 20 times more energy efficient.
I remember back in school that warm air rises, and cold air descends. So if you have the usual fridge where you open the door horizontally, cold air escapes rapidly.
Now compare it with this chest freezer, you open in from the top, vertically. Guess where the cold air is? Its deep down inside the bottom part of the chest freezer. Less cold air excapes.
So what’s the difference between a freezer and a fridge? Just temperature. If somehow, you can control the temperature of this freezer and shutdown the compressor at about 4 degrees centigrade, it becomes a fridge. Well, that’s exactly what the guy did.
He created a device that does exactly that. Check it out at mtbest.net
You need to learn the difference between power and energy, watts and watt-hours. It’s nonsensical to talk about “watts per hour”. 100W x 24hours = 2.4 kilo watt hours / day.
You’re units are wrong: you are confusing power (watts) and energy (watt-hours). The freezer supposedly draws 0.1 kilowatt-hours per day, which is equivalent to 4.16 watts of continuous power.
A Watt is 1 Joule per second. The fridge is on for 2 minutes per hour. So it uses 0.1KWh per day. A KWh is the equivalent of running a 100W appliance for 1h per day. It is nonsensical to quote power usage (watts) per hour, as that is the same as joules per second per hour.
This is an amazing fridge, however, as it costs the same to run as a bright light bulb that is only on for 1 hour per day!
Sorry to burst your bubble, but your numbers make no sense. Wattage is a power rating, it measures energy consumption over time. Watt/hour is a meaningless dimension.
What you are looking for is kilowatthours (kWh) which measures actual energy consumption.
a watt is a unit of power over time- 100 watts is exactly that- 100 watts. 1 watt is exactly 1 joule per second. 100 watts a day doesn’t make sense. it
doesn’t matter any more than power/time which the watt already defines. so the question is: does this thing consume 4 watts or 100 watts?
There is no such unit of measuremnt in use as watts per day.
oopps! Sorry about that guys. My bad. It was supposed to read 0.1kwh per day. Cheers!
I like what you have to say. I
Thanks Ty!
great idea but wouldn’t it be easier to simply adjust the existing temperature control, and skip rewiring and battery powered controllers?
Good article. Either the .1 kwh or the 100 watt hour portion of the article is fine. You just need to change the watt-hour to watt in “Lets compute, 100watts-hours in a day / 24 hours = 4.16 watt-hour.”
I’d love to have a super low energy fridge. There is one thing that most people dont realize when they hear all these ads about getting a new fridge. If getting a more efficient fridge saves ten bucks a month in electricty that savings won’t even cover the interest on many new units. This guy has the right idea converting an existing unit.