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Old 02-14-2014, 12:53 PM   #181
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Originally Posted by JasonC SBB View Post
If so inclined to build one, here's my suggested control system, using an Arduino or some such:

Regulate fan speed proportionally to water outlet temperature minus ambient temperature, something like over a 5-10* band.

Regulate water flow rate proportionally to target ambient temperature minus actual ambient temperature, over say a 2* band, but clip flow when water outlet minus ambient temp is more than say 12* or 15*F.

When room is warming up fan will max out and water flow will be regulated to 15*F outlet temp over ambient. When ambient is within 2* of target, water will regulate proportionally to ambient temperature, and fan will regulate to maintain the outlet temperature to minimize heat loss in the outlet water.
I could do that.

Or I could just, you know... turn the **** that I installed for that specific purpose.

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Old 02-18-2014, 10:54 PM   #182
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I use the same UPS that you do, Joe.
And I have the same computer case that was free-after-rebate as you, Joe.
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Old 04-03-2014, 12:16 PM   #183
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Bump on this, it's getting warmer now. Has the new system kept up, and worked well?
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Old 04-03-2014, 01:13 PM   #184
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Also, will you be trying this with cold water in the summer?
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Old 04-03-2014, 02:31 PM   #185
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Bump on this, it's getting warmer now. Has the new system kept up, and worked well?
The reliableness of the new system has been perfect.

In terms of capacity, it's sufficient to heat the whole apartment to the high 60s on all but the very coldest of days, or the bedroom alone to the low 70s with the door closed.

If I'm still here next year, I'll probably grab a second unit and put it in the far corner of the living room where it's coldest.




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Also, will you be trying this with cold water in the summer?
Haha. I somehow doubt that the "cold" water is quite cold enough for that.
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Old 04-03-2014, 02:53 PM   #186
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My water is 57*F. Would be plenty for cooling purposes. I do have my own well, though but yours should be similar.
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Old 04-03-2014, 05:43 PM   #187
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all you need is to tap in some garden misters and you're all set.
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Old 04-03-2014, 06:22 PM   #188
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The reliableness of the new system has been perfect.
Is that anything like reliability?
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Old 04-03-2014, 06:23 PM   #189
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Is that anything like reliability?
Only superficially.
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Old 04-03-2014, 06:29 PM   #190
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Only superficially.
I am meeting a friend in a few minutes for a drink and I believe I am in the mood for a cider. As an adult beverage connoisseur, would you perhaps be able to recommend a good cider?
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Old 04-03-2014, 07:15 PM   #191
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I am meeting a friend in a few minutes for a drink and I believe I am in the mood for a cider. As an adult beverage connoisseur, would you perhaps be able to recommend a good cider?
I'm honestly not much of a cider fan, sorry.
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Old 04-03-2014, 07:32 PM   #192
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I'm honestly not much of a cider fan, sorry.
Hahahahaha!

Priceless!
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Old 04-06-2014, 01:06 AM   #193
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Strongbow if you like it dry, Woodchuck if you're a woman.
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Old 04-06-2014, 08:27 PM   #194
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Strongbow if you like it dry, Woodchuck if you're a woman.
I'm sorry. It was an inside joke and not a true request for a recommendation.
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Old 04-07-2014, 01:01 AM   #195
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I still stand by my recommendations.
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Old 04-09-2014, 01:55 PM   #196
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Today's XKCD "What If..." was kind of interesting. I think I'm making more efficient use of the water than they describe here:

Faucet Power

I just moved into a new apartment. It includes hot water but I have to pay the electric bill. So being a person on a budget ... what's the best way to use my free faucet to generate electricity?
- David Axel Kurtz

You could build a tiny hydroelectric dam in your tub.



It would generate power, though not very much of it. The formula for power is pressure times flow rate. Since bathtubs are pretty shallow, the pressure at the bottom isn't very high, so this works out to around two watts of power, or about 25 cents per month.



You can get more power if you increase the pressure of the water passing through the generator. To do this, you could increasing the depth of the water. If you have two floors in your apartment, you could have the water column stretch from the second to the first floor, generating at least ten times the pressure and ten times the power. In effect, the local authorities would be paying to pump the water up to your apartment, and you're getting some of that energy back when you let it flow back down.



Could you use the faucet to pump the water up arbitrarily high, and get more and more power out of it as it falls back down?



No. First, you couldn't pump the water arbitrarily high. Household faucets have a pressure of around 4 atmospheres.[3] You can lift water about 10 meters per atmosphere of pressure, which means that a household faucet can only pump water up by about 40 meters.

Second, as you can probably guess by looking at the above picture, pumping the water up 40 meters with water pressure and then back down doesn't accomplish anything—you can just hook the faucet up to your device, and let the water pressure drive the generator directly. In either case, for a bathtub faucet, this works out to almost 200 watts, or $25 per month.

You'd have to make sure your plumbing could handle the water. If your pipes get plugged up and stop draining, the faucet could fill your house in a matter of days. And either way, eventually someone from the city would probably show up to ask why you're using 40 tons of water every day.



And really, with California suffering through its worst drought in history, this system might earn you some dirty looks. Sure, if you live far away from California, it's not like your water would have gone to ease their drought, but wasting a gigantic amount of water (and investing a bunch of money) to save a few dollars on your electricity bill might come across as a little rude.

A bathtub's flow rate is five or six orders of magnitude less than that of a river, but it's still a lot of water. Could we put it to a less selfish use?

There's a common piece of advice that says you should drink 8 glasses of water a day. No one really knows where this advice came from; people claim you should drink anywhere from 2 to 12 glasses of water daily,[4] and none of them have any real evidence behind them. The only real solid advice I've heard is that if you're thirsty, you should drink some water.

If we stick to the "8 glasses of water" standard, then a bathtub faucet provides enough drinking water to sustain about 10,000 people indefinitely. In other words, the city of Manhattan could survive on the water from just 150 bathtubs.



But if your goal is to save money on your electric bill, there's a much more lucrative option.

Single servings of bottled water sells for a dollar or two per half-liter. A lot of bottled water comes from municipal sources—that is, it's tap water. Bottled water isn't necessarily about the water; often, people are paying for convenience or because there's an issue with their water supply. Whatever the reason, however, there's no reason to let Coca Cola keep all the profits.

If you bottled the water from your bathtub faucet and managed to sell each bottle for $1.50, you'd make $72 per minute—$38 million every year.



Then you won't have to worry about your power bill.


Also, as if you needed yet another reason to love XKCD, viewing the HTML source code for his web pages is often hilarious. For instance, the normally-hidden title of the last image (the one with the water bottles) is:
YouTube has tons of people who will explain how you can power your house by building an engine that burns that water directly. Also, they have useful info about government weather control and the lizard people from the Earth's core.
Attached Thumbnails
Sticking it to the man-faucet_bath.png   Sticking it to the man-faucet_cost.png   Sticking it to the man-faucet_floors.png   Sticking it to the man-faucet_fountain.png   Sticking it to the man-faucet_baths.png  

Sticking it to the man-faucet_line.png   Sticking it to the man-faucet_power.png  
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Old 04-09-2014, 06:02 PM   #197
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The bathtub thing is silly. The water is already 60-70psi. All you need is an efficient little turbine generator.

I sell hydraulic generator sets that run off of 3000psi and make 240-480v so I've got nothing for this application.
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