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#31 | |
Apprentice EcoRenovator
Join Date: Aug 2010
Location: Windsor ON Canada
Posts: 229
Thanks: 4
Thanked 30 Times in 22 Posts
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#32 | |
Apprentice EcoRenovator
Join Date: Aug 2010
Location: Windsor ON Canada
Posts: 229
Thanks: 4
Thanked 30 Times in 22 Posts
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This is a small story about professionals. Ones I was checking the boiler room in public library and noticed that boiler is short cycling. There were 2 boiler but only one was working. It was cycling at 30-40 SECONDS intervals. You only can imagine the efficiency of this boiler...... I brought this up but... But wait a sec this is a public place who cares about efficiency???? Tax payers don't get refund.... ![]() |
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#33 | |
Supreme EcoRenovator
Join Date: Mar 2009
Location: Portland, OR
Posts: 4,004
Thanks: 303
Thanked 724 Times in 534 Posts
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Pure hear-say on this one, but the guy I got my Arduino data logger from said that he was able to deploy at least 70 sensors, and that runs of almost 100 feet are possible. From the experiences of other, it seems that if you put branches in your system, you can risk the reliability of your data. 1-wire boards, front & back. ("COW" should read "COM") I am using some tiny printed circuit boards that were designed by a local guy to mount my sensors onto and to connect the leads to, also. There's nothing particularly worth noting about the boards, with the exception that there are pads for soldering a termination resistor onto for the last sensor (sensor most distant from the micro-processor board). The idea is that a signal pulse that travels down the wire, will 'echo back' if it hits a drastic change in impedance, like if it hits an open (zero impedance) at the end of the line. The board also has pads for tiny caps to go from V+ to ground, if required. No one around here has needed to use the caps. My house is small, two-story with a basement, and I'm running my sensor string up along the chimney, which is pretty much in the center of the house. So far on my system, I am doing everything wrong... I have two single-sensor branches (short ones) coming off the main line, and no termination resistors and no power line caps anywhere. I'm getting good, reliable data. My total length is about 30 feet, excluding the short branches. I figure I have another 25 feet, and three sensors to go. I have read horror stories about people who have used CAT-6 cable, and have gotten horrible results, I have also read reports about the same setup and people who get great results. I had one apparent problem with one mounted sensor, so I replaced it with another, problem solved. Closer inspection revealed that my bad mounted sensor had a bad solder joint. I re-soldered the joint and it is now reliably in use. Aside from violating all the rules, I have been careful in the construction and deployment of my sensors... I check for good data, at each step. So far, I have not entered into the ZONE OF UNRELIABILITY. If things begin to get sporadic, I'll start with a termination resistor... If that doesn't do it, I'll go with the tiny caps... if that doesn't do it, I'll replace the branching topography with a linear one. That's what I can tell you at this point, hope it is of some use to you. Best, -AC
__________________
I'm not an HVAC technician. In fact, I'm barely even a hacker... Last edited by AC_Hacker; 09-25-12 at 10:38 AM.. |
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#34 |
Less usage=Cheaper bills
Join Date: Nov 2010
Location: Minneapolis, MN
Posts: 940
Thanks: 41
Thanked 117 Times in 91 Posts
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![]() Tiny little circuit boards, definitely very small cows :P
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#35 |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
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![]() I didn't see this info anywhere but are you using O2 barriered tubing. If not, you will need a bronze pump, strainer, no steel fittings and the water heater should not be used for domestic water. I would look at the Vertex water heater as a heat source. It is condensing, reasonably priced and won't short cycle.
Oh, and we always use Beldon twisted pair wiring for sensors. It is the industrial standard. Cheers |
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#36 | |
Helper EcoRenovator
Join Date: Jul 2012
Location: Rohnert Park, CA
Posts: 99
Thanks: 4
Thanked 14 Times in 9 Posts
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I'll check out the Vertex water heater - the significantly higher efficiency would definitely make a condensing one more attractive, but they are usually so %$#^ expensive compared to regular ones :P Thanks for the info! |
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#37 | |
Helper EcoRenovator
Join Date: Jul 2012
Location: Rohnert Park, CA
Posts: 99
Thanks: 4
Thanked 14 Times in 9 Posts
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BTW, I've also, as Vlad suggested, posted the controller piece into a separate thread: Custom hydronic heating controller As for the branching setup, electrically it should make no difference to a linear setup - the only difference is that you're attaching a bit of wire to the pins of each sensor - if you think of the sensor's legs themselves as short runs of wire, there's no practical difference between putting all the sensors onto one long wire run, or giving each sensor its own - you're only moving the place where all the signals start running in the same wire, but since two sensors aren't sampled at the exact same time, that shouldn't matter. In a linear setup, you'll have more wire for each sensor, and hence more resistance and capacitance. Since it's DC, capacitance of the wires is irrelevant, and the resistance should only lead to a negligible voltage drop - at 50 feet with halfway decent wire, I would expect 1% at the very most (or 0.03 of 3.3V, which should be well within the tolerance of the sensors). |
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#38 | |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
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Also, try to have the pump on a vertical pipe so that any sediment doesn't sit in the pump volute. |
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#39 | |
Helper EcoRenovator
Join Date: Jul 2012
Location: Rohnert Park, CA
Posts: 99
Thanks: 4
Thanked 14 Times in 9 Posts
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#40 |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
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![]() Like this?
Danfoss Heating - North America These 24vac motors will drive with any signal. I would think one of the guys could come up with an outdoor reset control that uses the PID control I saw on here. tekmar has one but it is more fun to make it. |
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Tags |
diy, flooring, heating, hydronic, radiant |
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