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JoeK

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Posts: 135
Reply with quote  #41 
Far too long for an update sorry chaps.  Lots of interesting developments happening.  Not enough time to talk about them all.
Wanted to check in to say I'm still lurking out here and progress continues on this project.
Spent three weeks out of town studying all facets solar design and alternative bulding.   Looks like there could be an opening to develop an aquaponics system and some other thermal and small PV projects on the side.

I'll put up some progress pics sometime but for now here's the data log from 3 sensors for May 13-June 17th, about the length of data I can store with a tick every 15 min. Soon I will get some more sensors hooked up but for now sensors 1,2,3 are located above the intake about an inch from the cieling, across the way above the outtake again ~an inch or two from the cieling, and poked into the mesh perhaps 1/2" or so inside the outtake plenum.  I had tried to install a 4th sensor outside in a shady spot next to the E. wall but could not get it reading properly before I had to leave town.  Also will install 4 others yet to be determined but at least one in the battery compartment and one in/on the water tank.
The readings in columns S1, S2 are bunk as no sensors are installed there, but I did configure the controller to display solar irradiance and RH on those ports so it thinks something should be reading there i guess.

Not gonna get into too much depth analysis right now, but it is working great. Temp in the outtake plenum has not risen above 77*  and seldom climbs above 70* for more than a few hrs midday. Between the shaded north half and the passive vents using the heat pump has prevented any serious overheating without hooking up an additional exhaust fan.  Exhaust fan might not even be necessary.  Insulating the North wall will help a lot to limit day time heat gain as well.  Now that its finally summertime (we hit *28 ~june8th, last week saw 35*low, and two days ago had hail the size of marbles pouring from the sky for a few minutes...) most of the time all windows stay open all night and day, plus the door open a lot in the day.  The exhaust vent in the ceiling is open 24/7 and so far no fan has been needed to exhaust heat, the log shows a high temp of 118 while I was away it has not gone above 105 since I got back and started leaving more vents open at night.We will see how it goes heading into the hot month of July.    At 105* reading 1inch from the cieling it feels nice to stand in there for a while, pretty tropical but not bad.  Most plants along the S, side do get kinda droopy under mid day sun but they are still growing rapidly despite all the aphids....so many aphids...

That's it for now, I'll try to pop in a little more often than 3 months....

rtf 6-21-14_DTC_Log_HH.rtf    

Garage_Hermit

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Reply with quote  #42 
Hello, Joe !

Nice 2C U back and that you did not turn into compost [redface]

I am glad your data logger is working out - I took a look at your file there, looks like you get 5 weeks of data, is that because of hard-disk limitation ?

===============
Just the other day I was perusing your topic, especially Item # 28 about the data logger and the output relays.

I reckon this is the way I want to go also, for my  crawlspace fan, so it is great to have your feedback.

Cheers for now

G_H

(I have still not finalized my "passive/active" sales pitch, but am getting there !)

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
JoeK

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Posts: 135
Reply with quote  #43 
yes with 4064 ticks of storage the logger is set to tick every 15 min and should be able to hold 42 days or so. I believe it uses flash memory, but I don't know much other than I can unplug the thing or lose power and not lose the data...
Garage_Hermit

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Reply with quote  #44 
Joe,

FWIW, I borrowed some of your tix, and put them into Excel, per the method shown in this interesting vid...



xls
 joe's_tix.xls     

I'm a newbie at (xl) (guess it shows !)
however, what is interesting, is how Brian Smith explains his stuff [smile]

Just to bother U with a question - does the MAXDTC come supplied with the 8 x temp sensors, or do you have to buy them separate ??    Also, what is the length of the leads, and can one extend the leads to say 40 foot using speaker wire etc ?

Thanks for  your time,

G_H


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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
JoeK

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Posts: 135
Reply with quote  #45 
The MAXDTC does not come with the temp sensors, they must be bought seperate for an extra 50$, ~6$ each.  The leads supplied witht he sensors are like 5-6ft but yes they can be extended, up to 100ft IIRC, using small wire at min 24AWG. Brian recommended using phone wire as the cheapest option.  I got some bundled 24AWG phone wire very cheap with 6 wires in a sheath.  I've found this very thin wire a bit of a pain to work with as it takes care not to break it while stripping and connecting. I just twisted it, don't recall if I used heatshrink I think I just taped over the connections.  If I didn't already have 200ft of said wire I would probably try to find something affordable in the 20-22AWG.  It does the job though

I'll have to take a look at that xl later....

Best
Joe
Garage_Hermit

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Reply with quote  #46 
Many thanks for the information, Joe, I read you: 50 USD for 8 sensors, therefore around 6 dollars each.
And extendable leads, sounds OK !

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
mattie

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Reply with quote  #47 
Hello Joek
Big thanks for sharing the data and nice work G_H on creating the spreadsheet!
Regards Mattie
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