My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
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tel jetson wrote:
with all that stuff around you, you should really look into EMF. saving a whole bunch of electricity and money will probably lose its appeal if you've got to hurt yourself to do it. maybe you'll decide that it's nothing to worry about, but I think you should at least do some reading if you haven't already.
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
paul wheaton wrote:
ned,
So your post is focused on fridge stuff? I have to admit that nearly all of it went over my head. Maybe it will make more sense if you tell the basics: are you saying that when the room is 50 degrees, the fridge has to work harder? Therefore, my attempts to save energy could be lost through the fridge, and, further, that it could lead to fridge damage?
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
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find religion! church
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get stung! beehives
be hospitable! host-a-hive
be antisocial! facespace
Burra Maluca wrote:
So keeping a fridge in a cold place reduces it's life expectancy.
In essence. In words a dumb-ass housewife like me could understand...
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
tel jetson wrote:
maybe you could start a new thread about that, Ned. I've got a freezer sitting on my porch that I'm probably dooming to an early death, since I wasn't aware of this stuff. the instructions said cold ambient temperatures could cause problems, but I pretty much just ignored that.
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
Muzhik wrote:
NedReck, based on the above discussion, would I be correct in saying that designing a heat pump for use in your standard household refrigerator would be a non-trivial task?
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
paul wheaton wrote:
Here is what I think I understand so far:
96) at 50 degrees, the fridge will use less power overall, but more more power per shifted BTU.
...more power per BTU AND longer run times resulting in MORE power consumption
97) since the lube isn't getting moved around as much, the fridge life expectancy can be cut from 10% to 50%.
...Lube and excessive cylinder temps internally, rate of wear hard to predict, 50% used as an example to show where one would not "blame more than age" for the failure when indeed the device was killed prematurely, depending on conditions it could be 80 to 90% life reduction of the device. In your posted temp ranges I would estimate the math would indicate a 20-50% reduction in life expectancy but I have done none of the supporting math to confirm.
98) it is possible to design fridges to work well in an area that can be 40 degrees to 90 degrees (or even greater extremes) but it is cheaper to be able to optimize for 65 degrees to 85 degrees.
...A domestic refrigerator is designed as an indoor appliance and those are expected indoor temps, commercial refrigerators, walk-in coolers etc have broader ranges required, the controls are included in them. They build them as cheap as possible, adding to controls serves no purpose for 99% of them so the expense of even a few dollars is of no value. The cost to adapt is not much, but since it is uncommon there are not really any over the counter type add ons. The key is to keep the condensing temp high enough thereby proving enough flow exist. A switch on the liquid line assuring it is 80 or it cuts the fan off would really broaden the range, a bulb type thermostat with the bulb tied to the line and insulated would achieve the goal and cost less than 30 bucks. Might even be a version for 10 or under, would have to look, it is kind of an unusual requestmost folks would freak if it was 40 inside their home.
I think that I am trying to achieve several things here:
E) things that people can do to save money in the short run.
F) come up with a way to save energy that is three times more efficient than the whole "CFL" scheme. Long term solutions to save on pollution, building new power plants and reduction of energy based wars. This might include coming up with contraptions that don't currently exist - like refrigerators that can function more efficiently over over broader temperature ranges.
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
paul wheaton wrote:
Oh, and my understanding is that people produce heat similar to a 75 watt light bulb.
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
NedReck wrote:
Your thermal value is 85 BTU per hour per person Equates to more like 25 watts FYI
Muzhik wrote:
That may be, but some of us have more thermal mass than others.
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
paul wheaton wrote:
DC vs. AC re EMF: are you thinking of making a custom heater? I suspect that the USB heated mouse would be DC.
PastTense wrote:
If Ned is right about the refrigerator, can't you measure it by putting a Kill-a-Watt meter on it?
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
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My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
My books, movies, videos, podcasts, events ... the big collection of paul wheaton stuff!
The ultimate goal of farming is not the growing of crops, but the cultivation and perfection of human beings. - Masanobu Fukuoka
paul wheaton wrote:
Ned,
Supposing that some US Department of large-and-in-charge were to come here and read this stuff and think "we need to require that fridge manufacturers meet a minimum criteria of __________ so that people can save energy by turning their heat way down." What would be the requirement?
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
travis laduke wrote:
This chest freezer + temp controller might be of interest
http://screwdecaf.cx/yatc.html
Professor of Thermal and Electrical Engineering, Welding/metallurgy: Licenses: PE license, Mechanical license Variety of other "certifications" from industry groups such as Refrigeration Service Engineers Society http://www.rses.org/, ASHRE http://www.ashrae.org/ Ect.
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