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|Topic Review (Newest First)|
|02-23-2012 04:24 PM|
I really didn't want to get into it, but.....
|02-23-2012 03:04 PM|
If your idea of an ice cube is about 5 lbs, then go with the 200 W-hr estimate. But for most of us an ice cube would be 1-2 ounces and melting it would take about 3-5 W-hr. This is calculated from the latent heat of melting which is 334 kJ/kg. (I'll post the conversion spreadsheet if you really want it). Think of it this way, one puts an ice cube under a 200 W heat lamp, do you really think it would take one hour to melt?
I can't say that I have ever seen an outlet that a central AC unit plugs into, I hope it's a big outlet though as they are probably 3-6kW. A 110V window unit, yeah that is OK to plug into this meter.
I have used my meter with my de-humidifier (which is essentially an AC) and found that it costs more than $1 for each container I dump.
I am an EE and I pray that several of the other posters in this thread really are not teachers or work on anything important as some seem to be a little off with their ideas or calculations.
|02-23-2012 02:23 PM|
|02-23-2012 02:01 PM|
|aviator79||Id buy this but I just dont think it would solve any issues. Its not like I can unplug my pond waterfalls once i relaize it is costing me $5-10 a month to run them. Im curious what my receiver and sub cost to run in standby, but im not about to unplug them/turn them off with surge protectors. I will see if the library has one I guess. Now Im going to go home and waste some engery.|
|02-23-2012 01:49 PM|
You are correct that DVR's burn a good bit of power (usually 30-40W continuous). However all the DVR's I've tested draw the same amount of power whether they are on or in sleep/standby mode. I did find it interesting that my ~8 year old TIVO draws about 10W less than my mothers new Motorola (from the cable company). I don't even bother turning off my TIVO anymore because it doesn't serve any purpose (or save any energy).
This seems to be true of most cable boxes as well, though I haven't tested many.
|02-23-2012 10:56 AM|
|02-23-2012 10:45 AM|
I understand more what you are getting at now and "take back" some of what I said. No hard feelings I hope . I was not trying to ascertain the "efficiency" of a device and in a perfect world where we could construct items which transferred energy with greater efficiency then as you put it the wasted heat energy would go down. I mean even a car is less than 20% effective in terms of being able to convert the stored energy in the fuel into motion (again due to all the escaping heat).
So I understand your arguments from a technical standpoint, unfortunately though we just don't live in that kind of world, however obviously we are getting their slowly over time and many devises are much more efficient than they used to be
More on topic and to your point, I suppose one could learn about the "efficiency" of some of their current appliances and devices, cause as you pointed out not all items are created equal and in many cases an inefficient device might generate or expel more heat as a result, thus wasted energy. I know for myself, this little $17 power consumption tool would get a few days worth of use and then get thrown in a drawer, but that's not to say it isn't a good deal or would serve others better
|02-23-2012 10:44 AM|
|02-23-2012 10:43 AM|
True SDers won't buy this thing, all the info is there, you just have to collect them, but spending $17 on this thing, is wasting money.
|02-23-2012 10:30 AM|
Aside from that though there are some things you can "fine tune" which may help a little. For example most of us have DVR's nowadays, these little suckers when on constantly use a significant amount of energy as they are constantly recording, the hard drives use up constant energy, etc... You can turn these off and they will still wake up and record things when scheduled to. This is a battle I've had with my wife in the past, but I've just had to let it go
Light bulbs, if you can deal with fluorescent bulbs, they are much more efficient than incandescent bulbs, another battle I lost though .
When you go away on small trips or vacation, turn down the watter heater and or reprogram your furnace. Also the next time your water heater goes out (which happens every 10 years or so) think about replacing it with an instant on water heater. Unfortunately their up front cost is more than traditional water heaters, but they are way more efficient as they are only used when you want hot water, so your not constantly heating a tank all day long.
If you live in a warm climate, rather than just running the AC all day, there are other tricks you can do to help offset the amount you have to use your AC, such as keeping blinds shut, tricks with venting such as solar attic vents.
Computers left on all day long will chew a constant amount of energy...
Overall though these are pretty much common sense kinds of things but overall you are right. Unless you want to hand wash and hang dry your clothes, freeze in the winter, boil in the summer, eat raw unrefrigerated food there is only so much you can do to be more efficient.
One thing I can guarantee you is anything you have that generates any significant amount of heat is going to use more power. Ovens, ranges, dryers, AC's (granted these may be gas or electric), refrigerators, space heaters, hair dryers, the list goes on
|02-23-2012 10:25 AM|
My water heater is gas, so that's not an issue.
|02-23-2012 10:18 AM|
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