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Search: Posts Made By: jeff5may
Forum: Geothermal & Heat Pumps 02-16-17, 12:12 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Slippy, Ok, here comes a bunch of hodgepodge...

Slippy,

Ok, here comes a bunch of hodgepodge quick answers to get you started in the right direction:

1. Cooler supply air and longer run times beat warmer supply air and short cycle times....
Forum: Geothermal & Heat Pumps 08-02-16, 11:15 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Yep, that's a CPEV aka flow-rator valve. Just...

Yep, that's a CPEV aka flow-rator valve. Just like a TXV without a sensing bulb. It works just like an air compressor regulator. Plumbed in parallel with a cap tube, it will set the low pressure...
Forum: Geothermal & Heat Pumps 08-02-16, 08:42 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Sorry I haven't been lurking or posting as much...

Sorry I haven't been lurking or posting as much as usual lately. The flood gates have opened at work, and I'm on a 7 day schedule. Last day off was the 4th of July, next day off will be Labor Day....
Forum: Geothermal & Heat Pumps 07-20-16, 10:48 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
you can get 3 kw worth of heat out of a good air...

you can get 3 kw worth of heat out of a good air source unit in chilly conditions without much trouble. That's about 10k btu per hour. There are many mini-splits in the 9 to 12 kbtu range that beat...
Forum: Geothermal & Heat Pumps 03-13-16, 07:12 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
It is people just like you that the refrigeration...

It is people just like you that the refrigeration industry points its long fingers at. I hope you are proud of yourself. Your well documented projects inspire more people than you might think. They...
Forum: Geothermal & Heat Pumps 03-08-16, 08:37 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Engineering, lots and lots of engineering. A...

Engineering, lots and lots of engineering. A compressor doesn't care what you put in it, or even if it is connected to any plumbing at all. If it can, it will run. In fact, it will run itself to...
Forum: Geothermal & Heat Pumps 03-05-16, 07:21 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
No, what I am saying is that what you have set up...

No, what I am saying is that what you have set up now is not what a heat pump is good at supplying at high performance. With YOUR weather conditions, it would be nearly impossible for ME to...
Forum: Geothermal & Heat Pumps 03-03-16, 09:36 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Ok, so to answer DonT's questions directly: 1....

Ok, so to answer DonT's questions directly:
1. A 11KBtu compressor feeding a hydronic HX would probably not heat his barn-home during frigid weather, even at 130 degF supply water temperatures.
2....
Forum: Geothermal & Heat Pumps 03-01-16, 01:18 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
*deleted***

*deleted***
Forum: Geothermal & Heat Pumps 02-24-16, 07:33 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
***deleted*****

***deleted*****
Forum: Geothermal & Heat Pumps 02-05-16, 04:30 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Something is not right here. The u-values you...

Something is not right here. The u-values you have reference to here are those typical for an unfinished steel building, such as a grain silo or hangar bay. Single pane glass windows have a u-value...
Forum: Geothermal & Heat Pumps 11-25-15, 07:25 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Some engineers just don't like to think out of...

Some engineers just don't like to think out of the box. I live there.

On that bombshell, let me plug my latest thread:
...
Forum: Geothermal & Heat Pumps 11-23-15, 06:38 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
I agree. The stainless "pinch or cinch clamps"...

I agree. The stainless "pinch or cinch clamps" are much stronger than the copper crimp rings. If a pipe freezes, the stainless clamps are strong enough that the fitting will pop open and leak before...
Forum: Geothermal & Heat Pumps 11-18-15, 12:27 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Please flog me if I am wrong, but this would seem...

Please flog me if I am wrong, but this would seem to be a good fit for shark bite fittings. They are not as cheap as irrigation-style clamp or crimp fittings, but they are dead easy to install and...
Forum: Geothermal & Heat Pumps 10-25-15, 10:31 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
I was running trials on a window a/c hacked into...

I was running trials on a window a/c hacked into a window heat pump. I was adjusting the txv so it would run with less superheat so that my evaporator would run closer to its maximum effectiveness. I...
Forum: Geothermal & Heat Pumps 10-20-15, 07:32 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Pegasus, Your pressures displayed in the...

Pegasus,

Your pressures displayed in the photos look pretty darn good for a system retrofitted with propane. Have you measured your heat transfer? From your description, it looks like your...
Forum: Geothermal & Heat Pumps 01-05-15, 12:13 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
if you want to maximize performance and minimize...

if you want to maximize performance and minimize cost you can never do enough measuring ahead of time. if you're doing it yourself, there is plenty of time to piddle around and take many many...
Forum: Geothermal & Heat Pumps 01-05-15, 04:04 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
IWarm, Some of the best performing GSHP...

IWarm,

Some of the best performing GSHP systems in the world use aquifers or rivers as their primary heat exchange fields. A prime example close to me is the Galt House East hotel in Louisville....
Forum: Geothermal & Heat Pumps 01-10-14, 08:42 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
not as easy as it sounds

http://www.breathepureair.com/fedders/qdkelectro-controls.gif

http://newimg.globalmarket.com/PicLib/248/2431248/prod/15_1331178414322_l.jpg

If you have a unit with an electric temp sensor, the...
Forum: Geothermal & Heat Pumps 12-09-13, 08:07 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
The pic is from the thread Mike linked a couple...

The pic is from the thread Mike linked a couple of posts up from me on the $45 chiller. Guy said in his post that he was 15 when he built it. Second hand 5000btu aircon repurposed into -30C PC...
Forum: Geothermal & Heat Pumps 12-08-13, 05:07 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
I especially love this one: ...

I especially love this one:

http://www.xtremesystems.org/forums/attachment.php?attachmentid=120175&d=1316206665

If a teenager can do it, you can do it. Water is an awesome secondary...
Forum: Geothermal & Heat Pumps 12-02-13, 01:55 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Waterdigger, My question to you is this:...

Waterdigger,

My question to you is this: what are you trying to accomplish with your system? Heating? Cooling? Dehumidification? Hot water supply? Some of the above? Answers to this basic question...
Forum: Geothermal & Heat Pumps 09-06-13, 06:13 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
I believe I rigged up my air source window unit...

I believe I rigged up my air source window unit (http://ecorenovator.org/forum/geothermal-heat-pumps/2484-cheap-window-reverse-cycle-ac-build.html) for under $50. If I had bought all new parts to do...
Forum: Geothermal & Heat Pumps 09-03-13, 12:05 AM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
The main thing i would be thinking about is to...

The main thing i would be thinking about is to try to ensure turbulent flow in the refrigerant-to-water heat exchanger. It is much smaller than the loop field and has to work harder.
Forum: Geothermal & Heat Pumps 05-20-13, 09:17 PM
Replies: 1,943
Views: 3,643,529
Posted By jeff5may
Northern Diver, Sorry to burst your bubble,...

Northern Diver,

Sorry to burst your bubble, but the spec sheet for the compressor you referenced says it is rated at 12000 btu (3500 watts). It can be found in the samsung mini-split model no....
Showing results 1 to 25 of 33

 
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