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Search: Posts Made By: superlen
Forum: Geothermal & Heat Pumps 12-06-15, 05:51 PM
Replies: 3
Views: 3,617
Posted By superlen
I would start by verifying the basics. Make sure...

I would start by verifying the basics. Make sure you *still* have 8gpm of 57deg water flowing in, and measure the temp leaving as well so you can calculate total heat removed from water.


Len
Forum: Geothermal & Heat Pumps 11-30-15, 03:22 PM
Replies: 218
Views: 113,645
Posted By superlen
Memphis, Regarding staging vs variable...

Memphis,

Regarding staging vs variable speed, watch out for oil return issues when using multiple compressors. I have visited three different Geothermal manufacturers over the last 10 years and...
Forum: Geothermal & Heat Pumps 11-30-15, 08:34 AM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-28-15, 02:00 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-27-15, 04:14 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-27-15, 02:24 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-27-15, 08:38 AM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-27-15, 07:36 AM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-26-15, 06:41 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-25-15, 08:53 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-25-15, 06:18 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-25-15, 04:40 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-25-15, 01:49 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-25-15, 12:25 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
-- 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...
Forum: Geothermal & Heat Pumps 11-25-15, 09:12 AM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-24-15, 01:17 PM
Replies: 1,943
Views: 3,635,031
Posted By superlen
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...
Forum: Geothermal & Heat Pumps 11-24-15, 12:57 PM
Replies: 21
Views: 20,618
Posted By superlen
Jeff, Great write up and overview of...

Jeff,

Great write up and overview of tools/parts!

I'll reiterate what you just said about the wet rag. I do this all the time, and one must be careful as the water on the rag can flash off to...
Forum: Geothermal & Heat Pumps 11-21-15, 12:33 PM
Replies: 218
Views: 113,645
Posted By superlen
I took some pics last weekend and I'll get them...

I took some pics last weekend and I'll get them uploaded, hopefully today. (Having some phone usb issues).

In the meantime here are some approx sizes. This is an older single wall coaxial that was...
Forum: Geothermal & Heat Pumps 11-21-15, 11:03 AM
Replies: 7
Views: 5,362
Posted By superlen
Thanks for posting pics of this & details.

Thanks for posting pics of this & details.
Forum: Geothermal & Heat Pumps 11-20-15, 06:45 PM
Replies: 218
Views: 113,645
Posted By superlen
Memphis, My coil is 6 turns at around 13"....

Memphis,

My coil is 6 turns at around 13". That works out to just over 20'. I'm a good guesser. :) It's rated for 5T, but obviously it matters how much gpm you an flow through it. A larger unit...
Forum: Geothermal & Heat Pumps 11-20-15, 12:00 PM
Replies: 218
Views: 113,645
Posted By superlen
I like this concept. It seems like this...

I like this concept.

It seems like this would provide a very efficient HEX without the hassle of coiling. Plus, it makes your basement look awesome! :) Is this the system you posted some...
Forum: Geothermal & Heat Pumps 11-20-15, 11:54 AM
Replies: 218
Views: 113,645
Posted By superlen
Memphis, I have a packless 5T coaxial. I can...

Memphis,

I have a packless 5T coaxial. I can measure for you this weekend if you like, but I'm guessing it's probably 20' if unrolled. My suggestion is go as big as you can....monster size if...
Forum: Geothermal & Heat Pumps 11-20-15, 11:45 AM
Replies: 2
Views: 3,203
Posted By superlen
+1 on getting a variable speed pump. If you...

+1 on getting a variable speed pump.

If you currently have +40f leaving, you should be able to slow your gpm down from the 9.8gpm and gain the efficiency of less pipe friction. You exit water temp...
Forum: Geothermal & Heat Pumps 11-19-15, 08:13 PM
Replies: 218
Views: 113,645
Posted By superlen
That makes sense. Good idea. I'm going to borrow...

That makes sense. Good idea. I'm going to borrow it. :)

Since you will continually lose prime during normal operation, I would try to locate your pump at the pond so it will prime easily & fast. ...
Forum: Geothermal & Heat Pumps 11-19-15, 12:04 PM
Replies: 218
Views: 113,645
Posted By superlen
Memphis, Keep the pump near your pond and...

Memphis,

Keep the pump near your pond and push the water uphill as you had planned. However, make sure that the pipe your pumping into returns all the way back down the hill to the pond. Do not...
Showing results 1 to 25 of 37

 
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