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post #281 of 340
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Quote:
Originally Posted by Naja002 View Post
Everything looks good! Frictional loss is the reason that the Iwaki doesn't hold up as well spec for spec as the mcp355. The more liquid that you try to shove through x-diameter pipe...the more frictional loss. And no it doesn't scale directly...it scales exponentially. The 355 and D5 are excellent pumps with their high psi/head and lower flow rates.
A quick visual way of looking at that is this Eheim 1250 vs Iwaki 30 RZT comparison. The windows version of that calculator supports adding pumps by inputting the PQ curve information. I would've started with 500' of 1" ID geothermal piping if I knew my run was going to be this long.

For the final flow check I removed the geo loop from the bridged mcp pumps and PC sub-loops. The res top mcp355 managed a hair over 1 GPM, and the Petra top one came in at .95 GPM. Combined they were a tad under 1.5 GPM.
post #282 of 340
Whens the 1500W heat dumping test going to begin? thats going to be interesting.
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post #283 of 340
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Originally Posted by mcpetrolhead View Post
Whens the 1500W heat dumping test going to begin? thats going to be interesting.
Early to mid next week. There's an areal flood watch in affect with 2-4 inches of rain expected overnight, and then more tomorrow. I might delay starting until Wednesday so the ground drains and compacts a bit.

The ground temperature sensor has been remarkably stable at 51f so far.
post #284 of 340
Oh my god this is epic!
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post #285 of 340
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Related to the subject of friction loss and larger diameter tubing (which allows the water to flow through the center of the pipe): apparently 4.3 GPM is required to fully purge the air out my 3/4 ID geothermal piping.

Small air bubbles sticking to the 1/2 vinyl tubing became very apparent when using one MCP355 to run the loop. Oops. This needs to be sorted out before the heat load test.

I might be able to do this with the spare Iwaki, but every time I break open the loop, some air will enter and become trapped. That's +1 for connecting devices to the ground loop with heat exchangers. Or the spare Iwaki could simply stay in the loop as a purging, backup, and temporary performance enhancing pump.
post #286 of 340
Not sure what to tell ya on the purging. Adding heat will cause everything to expand...gases and liquids. That will help remove a bit more of the air. May need to see if you can rent, borrow, steal a pump powerful enough for purging.

Once the ground settles, you may want to consider having the ground graded/leveled some. Whoever gets to cut the grass along the down hill run and main pit is going to be in for a heck of a ride!
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post #287 of 340
have the ground loop pump set up on pushing and ur return comeing to the top line in the rez then cycel the pump on of really fast for a few min the fast back and forth motion of the water inside the lines will force small bubels to murge into big ones and the big bubels will want to escape on thier own

as naja saide u can try pulling a vacume on the rez

u can convert an old bike tire pump into a vacume pump but to reach any kinda vacume ur hands will be sore

alsow a small compresor air pick up line will pull a vacume but the compresor might not last long pulling a vacume

alsow if u know where thier is an old fridge or a/c the compresor from one of those will pull a nice vacume but it will be junk after that du to the moisture it will pick up so no building a phase unit out of it latter
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post #288 of 340
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Here's the live graph of my 48 hour loop thermal conductivity test. The in-line heater element is pulling 1400w at the wall with a 97% efficiency. Sometime tomorrow morning the temperature rise should have leveled off and continued at a linear pace.







More details to come tomorrow, I need to get some sleep.
post #289 of 340
Quote:
Originally Posted by Romir View Post
Here's the live graph of my 48 hour loop thermal conductivity test. The in-line heater element is pulling 1400w at the wall with a 97% efficiency. Sometime tomorrow morning the temperature rise should have leveled off and continued at a linear pace.

More details to come tomorrow, I need to get some sleep.
< 5 deg dew point

Mine here in summer is around 18 deg....
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post #290 of 340
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Quote:
Originally Posted by Naja002 View Post
Not sure what to tell ya on the purging. Adding heat will cause everything to expand...gases and liquids. That will help remove a bit more of the air. May need to see if you can rent, borrow, steal a pump powerful enough for purging.

Once the ground settles, you may want to consider having the ground graded/leveled some. Whoever gets to cut the grass along the down hill run and main pit is going to be in for a heck of a ride!
I've learned that the typical geothermal loop is pressurized to 15-20 PSI for greater pumping efficiency. So that's where all the talk about their need for purging comes from. I bought the couplers and barbs for the spare Iwaki but didn't feel like opening it and re-doing the utility closet plumbing yet.

This ground will definitely need to be graded to keep the water draining into the ditch line at the bottom. I'm going to do that with a backhoe next month and reseed it. For optimal summer temperatures it would actually be better to leave it overgrown to let the grass absorb the suns heat. I'm afraid the mosquitoes would carry off the neighbor though.

Quote:
Originally Posted by shurik06_83 View Post
have the ground loop pump set up on pushing and ur return comeing to the top line in the rez then cycel the pump on of really fast for a few min the fast back and forth motion of the water inside the lines will force small bubels to murge into big ones and the big bubels will want to escape on thier own
I cycled the pump some after installing the water in/out sensors outside. Thanks. The ground loop is about 25 feet below the top of the reservoir so gravity is on my side.

Quote:
Originally Posted by leppie View Post
< 5 deg dew point

Mine here in summer is around 18 deg....
Me too. Last summer I had periods of 25c indoor temperatures with 65% humidity.
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