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Search: Posts Made By: jeff5may
Forum: Geothermal & Heat Pumps Today, 04:45 PM
Replies: 9
Views: 3,680
Posted By jeff5may
Ok so I decided to post in this thread as not to...

Ok so I decided to post in this thread as not to pollute the other, newer version thread.

I've recently been tinkering with more phase change monsters and have decided to have another go at the...
Forum: Geothermal & Heat Pumps Yesterday, 09:07 PM
Replies: 18
Views: 1,317
Posted By jeff5may
For domestic hot water heating, there are a few...

For domestic hot water heating, there are a few ways to go. You don't need a big heat pump. A few ecorenovators have made heat pump water heaters out of dehumidifiers. Randen made one out of a 5kbtu...
Forum: Geothermal & Heat Pumps 01-16-21, 01:43 PM
Replies: 4
Views: 1,555
Posted By jeff5may
I know. It was difficult for me to let go of the...

I know. It was difficult for me to let go of the idea. Keeping it simple was the hard part: everyone wanted to upgrade the basic control to tailor it to their personal site. I stuck with an Arduino...
Forum: Geothermal & Heat Pumps 01-16-21, 12:05 PM
Replies: 4
Views: 1,555
Posted By jeff5may
I've settled on the Trane American standard...

I've settled on the Trane American standard defrost model for control. Works like magic. The real one starts out with model number cnt5001 and has been revised over the years. Current model number is...
Forum: Solar Heating 01-10-21, 08:26 PM
Replies: 12
Views: 296
Posted By jeff5may
Main idea is: if it's working, play with it until...

Main idea is: if it's working, play with it until you make it short cycle. Then dial it back until it doesn't. Pick a sweet spot and drive it like you stole it.
Forum: Solar Heating 01-08-21, 08:38 PM
Replies: 93
Views: 23,629
Posted By jeff5may
Use one of the Gargantuan computer case fans. 15...

Use one of the Gargantuan computer case fans. 15 bucks for an 8 inch, moves somewhere around 100 CFM with a little back pressure. Sooper quiet, ultra low power, but they only produce a millimeter or...
Forum: Solar Heating 01-06-21, 03:05 PM
Replies: 219
Views: 111,694
Posted By jeff5may
The spring loaded check valves work pretty well....

The spring loaded check valves work pretty well. The ones without a rubber seal are cheaper than the ones with the seal. Easy peasy breezy. Any orientation installation for quick and simple.
Forum: Geothermal & Heat Pumps 01-02-21, 04:25 PM
Replies: 3
Views: 207
Posted By jeff5may
So, ignoring the residential HVAC industry's...

So, ignoring the residential HVAC industry's reluctance towards anything with "freon" outside "the magic box", a DX ground loop is no more difficult to construct than a glycol or water based ground...
Forum: Solar Heating 12-31-20, 11:47 PM
Replies: 4
Views: 215
Posted By jeff5may
Just about all the systems that I've seen that...

Just about all the systems that I've seen that actually work well use the second method you describe. Small e-tube collector loop volume, exchanging heat into a larger tank, usually insulated well.
Forum: Solar Heating 12-31-20, 11:22 PM
Replies: 19
Views: 1,557
Posted By jeff5may
Ok, so with your setup and goals in mind, I would...

Ok, so with your setup and goals in mind, I would recommend a smallish hot loop with glycol, non-drainback. Maybe 15 to 20 gallons max to go to and from the collector. Either a brazed plate heat...
Forum: Solar Heating 12-31-20, 12:44 AM
Replies: 13
Views: 1,053
Posted By jeff5may
Sorry, got busy living. As correctly speculated,...

Sorry, got busy living. As correctly speculated, the main concern relates to loss of power/pump events. Some e-tube collector models are designed and tested to withstand the 150 degC stagnation...
Forum: Geothermal & Heat Pumps 12-30-20, 02:55 PM
Replies: 3
Views: 207
Posted By jeff5may
So with an understanding of the overall heat pump...

So with an understanding of the overall heat pump refrigeration cycle, I will focus on the geothermal/ground source end of the system.

With a ground loop based system, the two main things that...
Forum: Geothermal & Heat Pumps 12-30-20, 12:24 PM
Replies: 3
Views: 207
Posted By jeff5may
Ok so a little background on the phase change...

Ok so a little background on the phase change heating and cooling system first.

Any air conditioning or heating system that relies on the phase change system moves heat via mass flow of...
Forum: Solar Heating 12-30-20, 11:49 AM
Replies: 19
Views: 1,557
Posted By jeff5may
Reading back through the thread, I gained some...

Reading back through the thread, I gained some understanding of the system you are considering. This leads to more questions.

What space or spaces are you going to be heating with the rig?

Are...
Forum: Solar Power 12-24-20, 02:36 AM
Replies: 15
Views: 898
Posted By jeff5may
The power supply in series idea will eventually...

The power supply in series idea will eventually end up in smoke. As with the old series connected vacuum tube heaters, it will work for a little bit. Once your luck runs out, something hogs a little...
Forum: Solar Power 12-23-20, 07:29 PM
Replies: 15
Views: 898
Posted By jeff5may
Ok, I just read through the thread and I thought...

Ok, I just read through the thread and I thought I would give you my 2 cents worth...

You're getting a feed in check for power generation. Why would you rob yourself?

You have a power inverter...
Forum: Geothermal & Heat Pumps 11-30-20, 04:00 AM
Replies: 220
Views: 49,032
Posted By jeff5may
Awesome to hear from you! So your rig has been...

Awesome to hear from you! So your rig has been running faithfully for 5 years now? At 20 cents a day instead of 50 or 60? With zero maintenance. Man, that's 700 bucks. WOW
Forum: Geothermal & Heat Pumps 11-09-20, 11:38 PM
Replies: 18
Views: 1,317
Posted By jeff5may
If you are looking for a unit to do only slab...

If you are looking for a unit to do only slab heating, that makes the system less complicated than one that both heats and cools. If you go with a brazed heat exchanger and a floor slab, you should...
Forum: Solar Heating 11-05-20, 07:43 PM
Replies: 4
Views: 480
Posted By jeff5may
Since your hx and the flow through it is your...

Since your hx and the flow through it is your limiting factor, put the panels all in series and force the highest dT across the hx. Make sure it is running counter flow as well to get the highest...
Forum: Lawn and Garden 11-02-20, 11:17 AM
Replies: 10
Views: 802
Posted By jeff5may
I'm guessing you could find an electric charcoal...

I'm guessing you could find an electric charcoal starter locally for around 9.95. Most are not tiny, use about 500 watts, and last a long, long time. I believe the one collecting dust in the garage...
Forum: Geothermal & Heat Pumps 11-02-20, 09:46 AM
Replies: 18
Views: 1,317
Posted By jeff5may
I see a few fundamental misconceptions with your...

I see a few fundamental misconceptions with your project. Just going to ask a few questions to clear up the mystery.

So the system you have running is a constant output unit that you have running...
Forum: Lawn and Garden 11-02-20, 08:22 AM
Replies: 10
Views: 802
Posted By jeff5may
Umm how about a hot surface igniter? They're used...

Umm how about a hot surface igniter? They're used in gss furnaces everywhere.
Forum: Introductions 09-22-20, 04:19 AM
Replies: 3
Views: 734
Posted By jeff5may
Welcome to the forums, kevin.

Welcome to the forums, kevin.
Forum: Solar Heating 09-21-20, 01:33 PM
Replies: 13
Views: 1,053
Posted By jeff5may
Drain back is not generally recommended with...

Drain back is not generally recommended with evacuated tube collectors. Mainly two reasons:
First, stagnation temperature can literally melt down gasket and sealing materials. When the sun shines...
Forum: Renovations & New Construction 09-08-20, 04:48 PM
Replies: 6
Views: 779
Posted By jeff5may
Ok so from your response, you are planning to...

Ok so from your response, you are planning to build bionic and above code requirements. Diy and separate (free/cheap) licensed inspector. Great. Now pick your price point and power sources.

Cheap...
Showing results 1 to 25 of 500

 
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