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Search: Posts Made By: mejunkhound
Forum: Geothermal & Heat Pumps 10-06-18, 09:01 AM
Replies: 1,942
Views: 1,677,964
Posted By mejunkhound
made a tube in tube water to R22 exchanger ...

made a tube in tube water to R22 exchanger

36mm inside diameter PVC plastic pipe carries water

Inside the PVC pipe have 18 mm diameter coper pipe with R22 inside.

25 meters length = ...
Forum: Geothermal & Heat Pumps 09-15-17, 10:07 PM
Replies: 14
Views: 3,868
Posted By mejunkhound
for a coax tube reference, I have a 70 ft long...

for a coax tube reference, I have a 70 ft long 3/4 copper inside 1-1/4" pvc evaporator on WSHP, 9 gpm flow. I get 5 Tons at COP of 5.2 for 56F entry water.

Scale accordingly for your 2T unit. ...
Forum: Solar Power 10-14-16, 12:07 PM
Replies: 157
Views: 39,153
Posted By mejunkhound
One more PS: What is great about this site...

One more PS:

What is great about this site are helpful pros like Steve: If you went to someplace like HVAC-talk.com for heat pump advice, all you would get from the 'pros' is a statement like:...
Forum: Solar Power 10-14-16, 12:03 PM
Replies: 157
Views: 39,153
Posted By mejunkhound
How often do you need to clean them? Posted...

How often do you need to clean them?

Posted before I say your question. The study from the early 80's I mentioned looked at the maintenance costs, specifically cleaning.

With the exception of...
Forum: Solar Power 10-14-16, 11:57 AM
Replies: 157
Views: 39,153
Posted By mejunkhound
Was going to reply also, but like Pinball,...

Was going to reply also, but like Pinball, realized that Steve has just about said all you need.
Go for it if physically able. You will learn a lot also.

You did not say what your age is or...
Forum: Conservation 07-27-16, 04:05 PM
Replies: 11
Views: 4,108
Posted By mejunkhound
re: I'm getting condensation between the panes:...

re:
I'm getting condensation between the panes:

Civil question so I'll give you a civil answer:

1. depends on how long you have noticed it 'fogged'
If just recent, very carefully drill a...
Forum: Renovations & New Construction 07-22-16, 06:07 PM
Replies: 18
Views: 4,270
Posted By mejunkhound
re: Safe AS much rain water as you can ...

re:
Safe AS much rain water as you can

Read that due to water rights laws (first in time, etc) it is illegal in CO to even have a rain barrel without having state granted water 'rights'. You...
Forum: Geothermal & Heat Pumps 07-13-16, 10:25 AM
Replies: 31
Views: 7,096
Posted By mejunkhound
If you are going to get an 80 CF bottle for...

If you are going to get an 80 CF bottle for welding also, get it filled with Argon, more useful for welding and only about $15 more (at least around here) for an Argon refill vs. nitrogen.
Forum: Geothermal & Heat Pumps 07-11-16, 06:46 AM
Replies: 5
Views: 2,299
Posted By mejunkhound
For a DIY scrounger type install , there is no...

For a DIY scrounger type install , there is no reason to use a reversible system.

Scroll compressors are only a few hundred $$ on ebay or CL.
Each system is more efficient if one does not try...
Forum: Geothermal & Heat Pumps 07-08-16, 10:32 PM
Replies: 27
Views: 7,447
Posted By mejunkhound
Had to look up what a WA AUS unit was for gas,...

Had to look up what a WA AUS unit was for gas, elec unit is the kw-hr.

Gas unit is 3.6 megajoules = 1 kw-hr (0.034 therms) 1$ US = 1.3 $ AUS

3.6 megajoule number comes from,
.278*3.6 MJ =...
Forum: Geothermal & Heat Pumps 06-18-16, 03:35 AM
Replies: 20
Views: 6,307
Posted By mejunkhound
One caveat on using scroll (or hemetic piston)...

One caveat on using scroll (or hemetic piston) compressors for vacuum:

ONLY use 120V motor compressors, if you use 240 scroll and pull a partial vacuum the air density gets below the Paschen...
Forum: Geothermal & Heat Pumps 06-17-16, 04:54 PM
Replies: 20
Views: 6,307
Posted By mejunkhound
I use a propane tank painted appropriate EPA...

I use a propane tank painted appropriate EPA colors for the recovery cylinder.

A salvaged 1/2 T scroll compressor from a free CL AC unit is the compressor.

Had the 4T compressor fail on my...
Forum: Conservation 06-01-16, 11:00 AM
Replies: 189
Views: 42,686
Posted By mejunkhound
3742.1 Have most of turbine welded...

3742.1



Have most of turbine welded up (pic), need to get the bearing supports welded up next, etc.

Grandsons did some of the welding, lots of technique for them to learn yet.

I'll...
Forum: Appliances & Gadgets 03-31-16, 01:42 PM
Replies: 2
Views: 1,779
Posted By mejunkhound
6 kW-hrs, room ambient about 58F (which is where...

6 kW-hrs, room ambient about 58F (which is where the WH draws the evaporator air) Actually, between 6 and 7 kW-hrs as the meter reads only to the kW-hr level, no fractions.

do have added R-11...
Forum: Conservation 03-31-16, 10:49 AM
Replies: 18
Views: 6,145
Posted By mejunkhound
Keep track of how much time you spend on this,...

Keep track of how much time you spend on this, I'd be curious.

NOte: have done some projects myself that I figured my 'return' was about 12 cents per hour - but it was 'fun'. <G>
Forum: Conservation 01-12-16, 02:38 PM
Replies: 13
Views: 4,530
Posted By mejunkhound
Just paint the walls and add a 1T backup AC. ...

Just paint the walls and add a 1T backup AC.

Bowling Green KY, winter design temp 10F, summer 95F.
Just for kicks, looking a physcho chart and off top of head calculations.

1 kW heat. ...
Forum: Conservation 01-10-16, 09:06 PM
Replies: 13
Views: 4,530
Posted By mejunkhound
I would suggest 3plink go online and pursue...

I would suggest 3plink go online and pursue 'psychometric chart'.

That is the basis for the questions he is asking.

After becoming familiar with the ps chart, 3 plink can find the weather...
Forum: Geothermal & Heat Pumps 11-21-15, 11:01 AM
Replies: 7
Views: 2,549
Posted By mejunkhound
linear tube in tube HE

Cannot recall which thread I was going to put this in, so will post as a general thread.

Rather than a coil, my 5 T water to R22 (or R290) evaporator is simply tying a bunch of coaxial pipe...
Forum: Geothermal & Heat Pumps 11-16-15, 11:26 PM
Replies: 8
Views: 2,664
Posted By mejunkhound
PSE sent my $629 check last week, but did have to...

PSE sent my $629 check last week, but did have to pay the sales tax of $61.

6255

6256

6257

Delphi Forums Login*-*Welcome! Please log in....
Forum: Renovations & New Construction 03-15-15, 09:44 AM
Replies: 10
Views: 5,098
Posted By mejunkhound
cheap recycled building

Finished building a shop/studio/MIL apt 1600 sq ft building for son.

Not including own labor, Total cost (less permits) about $5 per sq ft! OF the total, $1k was oak flooring, $1K for mini split,...
Forum: Conservation 01-24-15, 05:41 PM
Replies: 100
Views: 83,602
Posted By mejunkhound
Simplest is best, esp in colder climate where you...

Simplest is best, esp in colder climate where you can use the added indoor humidity.

I simply route the dryer vents (have 2 dryers) to a box with a furnace filter, dump the heat right back into...
Forum: Geothermal & Heat Pumps 09-18-14, 01:26 PM
Replies: 45
Views: 52,489
Posted By mejunkhound
Carnot is inversely involved with a heat pump...

Carnot is inversely involved with a heat pump cycle.

Look at it this way: it takes work to pump water uphill, in a like manner it takes work to move heat from low temperature to higher...
Forum: Geothermal & Heat Pumps 08-26-14, 05:07 PM
Replies: 10
Views: 3,932
Posted By mejunkhound
#1 is great idea if you need to replace a failed...

#1 is great idea if you need to replace a failed compressor. Big side benefit besides higher COP is that in HP mode the evaporator does not freeze up. Did this for own house.

#4 Beats even #1...
Forum: Lighting 02-19-14, 10:32 AM
Replies: 11
Views: 4,399
Posted By mejunkhound
PSE with heavily subsidizing Next time you...

PSE with heavily subsidizing

Next time you are in SeaTac or in PSE area, and have the time, pickup some $3 each PSE 'instant rebate' 6.5W LED bulbs. You may need to have your bud get them, as...
Forum: Lighting 02-08-14, 08:55 PM
Replies: 11
Views: 4,399
Posted By mejunkhound
re-use 'burnt out' T12 bulbs

Scored a score of 3 lamp electronic ballasts on ebay a few months back, for 3ea 32W T8 bulbs. About $4 ea ballast.


Have noticed that the 'burnt out' 40W T12 fluorescent tubes waiting to go to...
Showing results 1 to 25 of 31

 
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