Author Topic: Need pump ideas  (Read 5646 times)

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ghurd

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Need pump ideas
« on: September 16, 2010, 10:01:04 AM »
My friend is tinkering with solar DHW.

He wants to try a closed system with the actual DHW circulating to the heating panel from the storage tank.
For summer use only.

30' run of 1/2 or 3/4" (undecided) from the tank to the panel.
Panel is 100' of 3/4" black plastic pipe, in a ~52" square panel.
Vertical head is about 4'.

Water pressure averages about 50PSI at the high times, sometimes a bit more but not much more.

Need a 12V DC circulating pump for that.  Hopefully with not a lot of running amps, like less than 3A would be dandy.
Only 12V DC is available for the final version, but I suppose could run an inverter for temporary test.
It has to be Cheap for this temporary experimental one.

In summary-
12V, cheap, inline, low amps, able to handle being in a 50PSI system.

If it works out, he will go to something decent in the final version.

Anybody have any ideas?

Thanks,
G-

PS- I put it in 'water' because it is potable water.  Not sure where it really fits.
« Last Edit: September 16, 2010, 10:04:56 AM by ghurd »
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DanG

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Re: Need pump ideas
« Reply #1 on: September 16, 2010, 11:26:24 AM »
What is the maximum temperature the pump is to be exposed to?

ubud

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Re: Need pump ideas
« Reply #2 on: September 16, 2010, 11:33:37 AM »

dbcollen

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Re: Need pump ideas
« Reply #3 on: September 16, 2010, 12:02:12 PM »
I have an El-Sid10pv pump that I could loan you for testing purposes, it is a fairly expensive high quality pump specifically designed for circulating hot water. runs off a 10 watt PV, or a 12v battery.

Dustin
Mad River Wind and Hydro

here is spec sheet
http://stores.mavericksolar.com/-strse-165/Ivan-Labs-EL-dsh-SID10PV-EL/Detail.bok
« Last Edit: September 16, 2010, 12:11:45 PM by dbcollen »

ghurd

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Re: Need pump ideas
« Reply #4 on: September 16, 2010, 07:32:48 PM »
Max temp?  I don't know, but he has it figured he can get 40G up to "hot enough".
I expect he'd like to get to at least 125F.

If it does better, then they won't need to fire up the coal that day.
If it does get to 125F, then a few saw mill cut offs will get it up to hot enough in the evening before showers.

The ebay pump doesn't look like it can deal with 50PSI in a closed system.

More info.
In the winter, the DWH flows through the coal furnace.  The stove is the furnace.
In summer it is made by a coal water heater, which only needs a small bit of coal (coal is a PITA) if its only needed for 30 minutes.
In summer, a big pot of hot water with a coal fire in the center is not so great when its 85F outside.  It is the short round thing.
http://i701.photobucket.com/albums/ww20/ghurd1/Pumpless%20Water%20Heater/PICT0897.jpg

It would be great if the solar could get the 40G of water up to 130F, so it would not need combustion.
If it helps, but can't get up to warm enough, then a few sticks of kindling will get the water past 140F in short order.
Pics-
http://s701.photobucket.com/albums/ww20/ghurd1/Pumpless%20Water%20Heater/

Dustin!
That is mighty nice of you.  Thanks!   ;D
Thats about what I was thinking for permanent use.
Let me make sure he can get the box finished up and plumbed in for a test pretty quickly.  Otherwise, we'll miss the sun for this year, and it won't be back until maybe late April...
Unless you mean burrow it for 8 months?  :P
In 8 months it would only get a few days use.   :'(

Thanks guy, and keep the ideas coming.
G-

« Last Edit: September 16, 2010, 09:12:39 PM by ghurd »
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madlabs

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Re: Need pump ideas
« Reply #5 on: September 16, 2010, 09:09:46 PM »
Second vote for the EL-SID pump. My buddy uses one in his solar heating system and loves it. They ain't cheap though, but great power consumptions and built to last.

Jonathan

dave ames

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Re: Need pump ideas
« Reply #6 on: September 17, 2010, 12:56:47 PM »

 hey G-

for a proof out/trial, might try an automotive coolant circulating pump? not much head- and a low flow rate might be what we want?

some of the mercedes, bmw, and vw coolant pumps are made by bosch (always quality stuff)

one to eyeball
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=160402116989&crlp=1_263602_263622&ff4=263602_263622&viewitem=&guid=ede30af31270a02693e18b61fff9e984&rvr_id=141427668261&ua=WXI7&itemid=160402116989

local junkyard may have a self service bargin?

cheers, dave

hiker

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Re: Need pump ideas
« Reply #7 on: September 17, 2010, 02:04:04 PM »
my old motorhome has a nice little pump....dosent really draw that much power..good pressure as well..
so check out some motorhome parts supply stores...
WILD in ALASKA

B529

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Re: Need pump ideas
« Reply #8 on: September 17, 2010, 08:17:14 PM »
50psi is high for a closed loop system. 15psi cold should be about right.

I know it's not cheap, I run a EL-Sid as others suggested.

Whatever your buddy gets, I would pay attention to the flow (maybe 3 gpm) more so than the amp draw.

hydrosun

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Re: Need pump ideas
« Reply #9 on: September 24, 2010, 02:38:05 PM »
For a permanent solution I'd go with the Laing eco solar pump. I've switch to using them instead of the El Sid. More features,( including shutoff,check valve, unions all built in), better damp proof, and start under lower sun conditions. And the price is similar or lower.
Chris