Forum: Geothermal & Heat Pumps
11-30-15, 08:34 AM
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Replies: 1,943
Views: 4,647,228
FYI,
Here's what led me to this.
The...
FYI,
Here's what led me to this.
The thermal conductivity of PE(X) is approximately 0.41-0.46 W/(m K), copper is a whopping 28. (no surprise)
And here is a table I found that is...
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Forum: Geothermal & Heat Pumps
11-28-15, 02:00 PM
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Replies: 1,943
Views: 4,647,228
AC,
After doing some more research, I am...
AC,
After doing some more research, I am finding out that the thermal conductivity of the pipe vs the ground is actually not that different. My assumption was that the dirt was far less...
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Forum: Geothermal & Heat Pumps
11-27-15, 04:14 PM
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Replies: 1,943
Views: 4,647,228
Steve,
I too think it's the Viscosity you...
Steve,
I too think it's the Viscosity you are using, all the other values in your equation looked correct to me. I think its' a Kg vs g discrepancy. For reference, here is the online calculator...
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Forum: Geothermal & Heat Pumps
11-27-15, 02:24 PM
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Replies: 1,943
Views: 4,647,228
Steve,
I understand the equation. I have...
Steve,
I understand the equation. I have done the calculations myself and you're answer is wrong. If you like, I can point out the error but I thought that you might want to discover it...
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Forum: Geothermal & Heat Pumps
11-27-15, 08:38 AM
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Replies: 1,943
Views: 4,647,228
Steve,
You keep saying that the flow in...
Steve,
You keep saying that the flow in these loops is always waaay down in the laminar range, but my instinct tells me that's too far in the weeds. Also, when I do some research there are many...
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Forum: Geothermal & Heat Pumps
11-27-15, 07:36 AM
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Replies: 1,943
Views: 4,647,228
More thoughts...
I think that any increase...
More thoughts...
I think that any increase in heat transfer due to turbulent will only be from the water to the plastic pipe shell. From there is has to flow into earth which will be massively...
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Forum: Geothermal & Heat Pumps
11-26-15, 06:41 PM
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Replies: 1,943
Views: 4,647,228
Steve,
Thanks for running those numbers....
Steve,
Thanks for running those numbers. I'll need to double check the quick online calculator I used as they aren't matching. I trust the equation more than the online calculator & I'll run my...
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Forum: Geothermal & Heat Pumps
11-25-15, 08:53 PM
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Replies: 1,943
Views: 4,647,228
AC,
Thanks a ton for those two pics. I noted...
AC,
Thanks a ton for those two pics. I noted much earlier in this thread the discussions on the "turbulent sweet spot" & tabled it as I didn't quite wrap my brain about how one could get a little...
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Forum: Geothermal & Heat Pumps
11-25-15, 06:18 PM
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Replies: 1,943
Views: 4,647,228
Hold on Steve.. Don't drag me into this.
I...
Hold on Steve.. Don't drag me into this.
I think my horizontal loops ARE turbulent. According to the online calculator I used, my 3/4" 3gpm are highly turbulent. I'm all ears if there is evidence...
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Forum: Geothermal & Heat Pumps
11-25-15, 04:40 PM
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Replies: 1,943
Views: 4,647,228
Steve,
I'm still a little confused on the...
Steve,
I'm still a little confused on the power calcs as it pertains to turbulent vs laminar. The equation I used (or tables supplied by mnf which match my numbers) give out head loss vs flow...
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Forum: Geothermal & Heat Pumps
11-25-15, 01:49 PM
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Replies: 1,943
Views: 4,647,228
Steve,
I haven't checked the Reynolds...
Steve,
I haven't checked the Reynolds number, but was assuming that it was not close to turbulent. I'll double check. FYI, the 15gpm was just a swag at maximum flow I might need to give me a max...
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Forum: Geothermal & Heat Pumps
11-25-15, 12:25 PM
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Replies: 1,943
Views: 4,647,228
-- LOOP pumping costs analysis --
To...
-- LOOP pumping costs analysis --
To resurrect my existing loop field I have to install some new supply/return lines. I was considering pros/cons of different piping methods and in determining...
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Forum: Geothermal & Heat Pumps
11-25-15, 09:12 AM
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Replies: 1,943
Views: 4,647,228
Jeff,
For full disclosure, I am an engineer....
Jeff,
For full disclosure, I am an engineer. :) I'm electrical though, not refrigeration in any means. I do agree with you that some engineers I have met are very inside the box. The ones at...
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Forum: Geothermal & Heat Pumps
11-24-15, 01:17 PM
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Replies: 1,943
Views: 4,647,228
Give me a backhoe and some free time & wisdom...
Give me a backhoe and some free time & wisdom goes out the window. :)
If I had started the project, 6 months later I would have been golden. About 6 months after I finished my system, I started...
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Forum: Geothermal & Heat Pumps
11-18-15, 09:33 PM
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Replies: 1,943
Views: 4,647,228
Jeff,
If I made the connections inside the...
Jeff,
If I made the connections inside the access boxes I think sharkbites would be fine, although I'd probably still just use typical crimp rings. If I opt to bury I think sharkbites would bite...
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Forum: Geothermal & Heat Pumps
11-17-15, 12:05 PM
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Replies: 1,943
Views: 4,647,228
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Forum: Geothermal & Heat Pumps
11-13-15, 04:37 PM
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Replies: 1,943
Views: 4,647,228
I did my calcs based on the R60 and R36 that I...
I did my calcs based on the R60 and R36 that I have now. Although the version of HVCALC I had wouldn't go to R36 for walls, so I used R18 and cut the surface area in half. I do need to redo the...
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Forum: Geothermal & Heat Pumps
11-13-15, 01:05 PM
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Replies: 1,943
Views: 4,647,228
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Forum: Geothermal & Heat Pumps
11-13-15, 08:40 AM
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Replies: 1,943
Views: 4,647,228
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Forum: Geothermal & Heat Pumps
11-11-15, 09:48 AM
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Replies: 1,943
Views: 4,647,228
AC, Thanks for the warm welcome.
I'll start...
AC, Thanks for the warm welcome.
I'll start collecting some pics of the system I'll be working on and the options I have. I have too many options and ideas (each with their own pros/cons) and I...
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Forum: Geothermal & Heat Pumps
11-06-15, 11:49 AM
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Replies: 1,943
Views: 4,647,228
AC,
Just a quick post to say thanks for...
AC,
Just a quick post to say thanks for getting this thread started. I rolled my own GSHP several years back and had this resource (or more importantly, friendly interested people to bounce ideas...
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