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Forum: Geothermal & Heat Pumps 03-28-13, 01:09 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
My condenser HX is rated at 25 bar. Not knowing...

My condenser HX is rated at 25 bar. Not knowing any better I originally asked for a 30 bar unit, but the supplier pointed out (A) I didn't need one, and (B) if I still wanted one it'd be nearly twice...
Forum: Geothermal & Heat Pumps 02-27-13, 07:15 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Super interesting (well, I think so anyway)...

Super interesting (well, I think so anyway) article on long term corrosion of BPHX when used in an open loop geothermal application (like mine is).

http://geoheat.oit.edu/pdf/tp41.pdf

I've...
Forum: Geothermal & Heat Pumps 12-17-12, 07:30 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
On my cooling only system I've got around the...

On my cooling only system I've got around the need for the crank case heater by using a liquid line pumpdown solenoid. In my case I did it because I don't want the in-roof units left with ready...
Forum: Geothermal & Heat Pumps 12-16-12, 06:43 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
That looks like a TXV. So yes, subcooling is the...

That looks like a TXV. So yes, subcooling is the way to optimise your charge.

The theory is the higher your subcooling, the more liquid you have backing up in your condenser and the less condenser...
Forum: Geothermal & Heat Pumps 12-05-12, 12:30 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Have not spotted this posted before and stumbled...

Have not spotted this posted before and stumbled across it today. Some really good stuff here from basic leak detection through to HC refrigerants.

Reports, Guidelines, and Tools | GreenChill | US...
Forum: Geothermal & Heat Pumps 11-27-12, 05:40 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I'm quite cynical on this subject. My thoughts on...

I'm quite cynical on this subject. My thoughts on 410a are more along the lines of patented substances and Dupont and Honeywell lobbying.

On a more practical note, 410a has a higher heat capacity...
Forum: Geothermal & Heat Pumps 11-27-12, 10:00 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
He's pretty right, although if you are talking...

He's pretty right, although if you are talking about maximising heat then you want the evaporation temperature as high as you can practically get it.

If you look at a spec sheet for a medium temp...
Forum: Geothermal & Heat Pumps 11-27-12, 12:45 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
If you are condensing at the same temperature,...

If you are condensing at the same temperature, but you drop your SST then the compressor has to work harder to compress the gas (higher compression ratio), and therefore you increase your power...
Forum: Geothermal & Heat Pumps 11-27-12, 12:24 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I've been keeping a very irregular eye on things,...

I've been keeping a very irregular eye on things, but it's been a manic winter. Have 10 days away coming up to catch up on what you guys have been upto over (my) winter.

I started back on my...
Forum: Geothermal & Heat Pumps 08-15-12, 04:32 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I have a copy of the original Excel spreadsheet...

I have a copy of the original Excel spreadsheet that pdf came from if anyone wants it.

Been a bit quiet lately. We've actually had (having) a wet winter this year, which while very very welcome,...
Forum: Geothermal & Heat Pumps 03-25-12, 09:50 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
So as you draw heat from the water, you are...

So as you draw heat from the water, you are unable to keep enough heat feeding the refrigerant to prevent the SST from dropping below the freezing point of water. You have a couple of options....
Forum: Geothermal & Heat Pumps 03-12-12, 09:00 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
This is a vital point that can't be emphasized...

This is a vital point that can't be emphasized enough.

Heat exchange is the process of transferring energy. This is a very simple case of thermal conductivity. The greater the differential between...
Forum: Geothermal & Heat Pumps 03-12-12, 10:27 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I've avoided answering this until I'd thought...

I've avoided answering this until I'd thought about it and settled on a polite answer.

The polite answer is: "bollocks!" If you remove the metering device (MD) you are simply pumping a liquid and...
Forum: Geothermal & Heat Pumps 03-10-12, 04:50 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
In the case of a fixed expansion device (orifice...

In the case of a fixed expansion device (orifice or cap tube) I agree with you completely.

A TXV or properly controlled EEV will open up further to maintain superheat thus increasing the mass flow...
Forum: Geothermal & Heat Pumps 03-10-12, 02:58 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Not true at all. Your suction temperature drops...

Not true at all. Your suction temperature drops because your compressor is not working as hard and therefore can flow more mass of refrigerant. Therefore you *DO* remove more BTU's. Refrigeration in...
Forum: Geothermal & Heat Pumps 03-09-12, 06:43 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Ahh, but we are talking about two different...

Ahh, but we are talking about two different things. I'm talking about the extra efficiency that can be gained by having a much larger condenser than evaporator. The larger the condenser, the lower...
Forum: Geothermal & Heat Pumps 03-09-12, 08:24 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Convenience rather than efficiency. Nobody...

Convenience rather than efficiency. Nobody condenses at temperatures low enough to really maximise efficiency.

Look at it this way. If your condenser needs to be about 5.5x the size of your...
Forum: Geothermal & Heat Pumps 03-08-12, 07:44 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Oh that's easy. Reverse the water flow. Remember,...

Oh that's easy. Reverse the water flow. Remember, condenser needs to be about 5.5 times the size of the evap. By keeping the refrigerant loop constant and reversing the water you only need properly...
Forum: Geothermal & Heat Pumps 03-08-12, 07:24 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I spent an inordinate amount of time developing...

I spent an inordinate amount of time developing spreadsheets for this stuff when I was going to use 7/8" tube coils in a 44 Gallon drum as a condenser. Need some more info.

If you can give me...
Forum: Geothermal & Heat Pumps 03-01-12, 04:37 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
I decanted 8KG of Propane by drawing vapor from a...

I decanted 8KG of Propane by drawing vapor from a bottle. It was a 30C day, but the time I'd finished the source bottle had a very nice thick fur of frost. Wish I'd taken a photo.

We don't keep...
Forum: Geothermal & Heat Pumps 03-01-12, 02:38 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Your theory is sound, but you will want to start...

Your theory is sound, but you will want to start quite a bit lower than -10C as you are likely to have some iso-butane in there also.

Hydrocarbon gasses that you want to keep are very much more...
Forum: Geothermal & Heat Pumps 02-28-12, 07:22 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Nope. Please use a HPCO on the discharge of the...

Nope. Please use a HPCO on the discharge of the compressor.
Something like these : Search Result Automatic Controls : Detail | Saginomiya Seisakusho, Inc....
Forum: Geothermal & Heat Pumps 02-24-12, 09:13 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
See, in Australia we are lucky. LPG automotive...

See, in Australia we are lucky. LPG automotive fuel is an unquantifiable blend, but BBQ Propane is over 95% Propane.

In any case, properly measuring the P/T of what is in your bottle will tell you...
Forum: Geothermal & Heat Pumps 02-24-12, 04:22 AM
Replies: 1,943
Views: 4,655,973
Posted By BradC
A refrigerant as listed by ASHRAE has a defined...

A refrigerant as listed by ASHRAE has a defined number. R290 is pure propane. Full stop. End of story.
R22a is not an ASHRAE sanctioned mnemonic by any stretch and what you get in the bottle is...
Forum: Geothermal & Heat Pumps 02-23-12, 09:34 PM
Replies: 1,943
Views: 4,655,973
Posted By BradC
Add my 2 Window A/C's with Cap tubes, and a 7KW...

Add my 2 Window A/C's with Cap tubes, and a 7KW reverse cycle ducted heat pump that originally had a fixed piston orifice and now has an EEV.

The properties of R290 are so compatible with those of...
Showing results 1 to 25 of 29
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