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Search: Posts Made By: BradC
Forum: Geothermal & Heat Pumps 06-04-15, 11:36 PM
Replies: 220
Views: 127,213
Posted By BradC
Ok, I'm late to this party primarily because you...

Ok, I'm late to this party primarily because you guys are awake and at it while I'm asleep.

Don't use the TXV. Now here's why. The sole purpose of a TXV is to maximise the use of the evaporators...
Forum: Geothermal & Heat Pumps 06-04-15, 07:50 AM
Replies: 220
Views: 127,213
Posted By BradC
Look, the reality is that a refrigeration system...

Look, the reality is that a refrigeration system is a balance. A properly designed system will have a defined heat load on the evaporator, a condenser to suit and a compressor and cap tube to suit...
Forum: Geothermal & Heat Pumps 06-03-15, 11:38 PM
Replies: 220
Views: 127,213
Posted By BradC
So that is about 87C. Most compressor data sheets...

So that is about 87C. Most compressor data sheets I've checked seem to think that over 100 is worth worrying about (212F). It's hot, but it's not out of the ballpark for a refrigeration system.
...
Forum: Geothermal & Heat Pumps 06-03-15, 11:14 PM
Replies: 220
Views: 127,213
Posted By BradC
To be honest, unless the coil surrounding the...

To be honest, unless the coil surrounding the compressor is pretty much bonded to the shell it's doing almost nothing for you. Radiant heat from the shell will superheat the gas in the pipe which...
Forum: Geothermal & Heat Pumps 06-03-15, 03:20 AM
Replies: 220
Views: 127,213
Posted By BradC
Compressors are either cooled by fan or cooled by...

Compressors are either cooled by fan or cooled by suction gas.
Cooled by fan is obvious. You need a constant airflow over the shell. Cooled by suction gas requires a minimum mass flow and a minimum...
Forum: Geothermal & Heat Pumps 05-11-15, 03:21 AM
Replies: 25
Views: 17,435
Posted By BradC
Most of you have seen these before. ...

Most of you have seen these before.

http://www.fnarfbargle.com/private/120310-HX3/IMG-20120310-00025.jpg
http://www.fnarfbargle.com/private/120310-HX3/IMG-20120310-00026.jpg...
Forum: Geothermal & Heat Pumps 05-08-15, 04:07 AM
Replies: 25
Views: 17,435
Posted By BradC
Ok, so you need to know some maths. I'll run an...

Ok, so you need to know some maths. I'll run an example for you.

I have a flat plate condenser on my ducted system at home. Here's how I sized it.

I have water available to me at 19C. I have a...
Forum: Geothermal & Heat Pumps 05-07-15, 12:31 AM
Replies: 25
Views: 17,435
Posted By BradC
I've been away from the forum for a while, but...

I've been away from the forum for a while, but this thread just appeared in my inbox and I thought some perspective might be useful.

A "threaded flare connection" is a *completely* different...
Forum: Geothermal & Heat Pumps 02-05-13, 08:58 PM
Replies: 57
Views: 35,558
Posted By BradC
Mostly right. Compression ratios remain the same,...

Mostly right. Compression ratios remain the same, it's just the low and high side pressures are higher in an absolute sense. The other thing about 410A vs 22 or 290 is it has quite a high latent heat...
Forum: Geothermal & Heat Pumps 01-30-13, 07:25 PM
Replies: 57
Views: 45,963
Posted By BradC
I've used Randen's method before (do it...

I've used Randen's method before (do it outside!).

When I was looking for a very hard to find leak on my system, I ended up trawling the bubble blowing forums for the best bubble mixture. Plain...
Forum: Geothermal & Heat Pumps 01-16-13, 07:37 AM
Replies: 55
Views: 35,666
Posted By BradC
Coolpack is *brilliant*. Nothing more to say. ...

Coolpack is *brilliant*. Nothing more to say.
Most of my tinkering is done with the straight single stage DX simulation.
It allows me to plug in the numbers I know (or want) and it'll tell me the...
Forum: Geothermal & Heat Pumps 01-10-13, 12:24 AM
Replies: 55
Views: 35,666
Posted By BradC
My new clamp meter arrived. Yay! Here's a quick...

My new clamp meter arrived. Yay! Here's a quick brain dump after taking some measurements.

I have not got the flow meter properly calibrated yet (the vendor told me after I had received them that...
Forum: Geothermal & Heat Pumps 01-08-13, 05:45 AM
Replies: 6
Views: 6,998
Posted By BradC
As an Australian, any sleight on the French is...

As an Australian, any sleight on the French is humorous you silly Kniggit. Why do you think I have this outraaaaaegous accent ?

Let's look at it this way. Calculate the volume of the evaporator...
Forum: Geothermal & Heat Pumps 01-07-13, 06:17 PM
Replies: 64
Views: 26,429
Posted By BradC
Not with propane it won't. You need propylene...

Not with propane it won't. You need propylene (the stuff in the yellow bottles). It has just enough extra oomph to allow you to braze. Personally I use either 15% silver rod for copper to copper or...
Forum: Geothermal & Heat Pumps 12-20-12, 09:03 AM
Replies: 55
Views: 35,666
Posted By BradC
Not that surprised. There's been a *lot* of...

Not that surprised. There's been a *lot* of interesting stuff cruise past recently. It's easy to fly under the radar.



I've had a number of people tell me I'm mad and it will never work. Not...
Forum: Geothermal & Heat Pumps 03-20-12, 08:59 PM
Replies: 55
Views: 35,666
Posted By BradC
Using handwaving generalities, a compressor is...

Using handwaving generalities, a compressor is driven by a synchronous motor. Within small tolerances, it rotates the same number of times per second. The power consumed is directly related to how...
Forum: Geothermal & Heat Pumps 03-17-12, 10:18 PM
Replies: 7
Views: 18,497
Posted By BradC
Yes. Don't do it. Nylog is made from...

Yes. Don't do it.

Nylog is made from refrigeration oil. Blue is synthetic, Red is mineral. You have no idea what the carrier is for the Teflon goop, and what it might do when it contacts...
Forum: Geothermal & Heat Pumps 03-09-12, 09:24 AM
Replies: 1,943
Views: 2,960,085
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, 08:24 AM
Replies: 1,943
Views: 2,960,085
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, 05:37 AM
Replies: 1,943
Views: 2,960,085
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, 03:38 AM
Replies: 1,943
Views: 2,960,085
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 02-19-12, 06:53 PM
Replies: 40
Views: 40,462
Posted By BradC
R407C is a blend of three HFC refrigerants...

R407C is a blend of three HFC refrigerants designed to give it properties similar to R22. Given it's HFC the oil is likely to be POE.

HC's will work with POE oil, however it is mightily...
Forum: Geothermal & Heat Pumps 02-17-12, 12:17 PM
Replies: 40
Views: 40,462
Posted By BradC
If I had to offer extra advice, I'd re-iterate...

If I had to offer extra advice, I'd re-iterate point 2 about 4 times. Go down to the local safety shop and buy 2 pairs of safety glasses. Buy a tinted pair for in the sun work, and a clear pair for...
Forum: Geothermal & Heat Pumps 02-17-12, 03:04 AM
Replies: 40
Views: 40,462
Posted By BradC
You would do well to read the Manifesto....

You would do well to read the Manifesto. AC_Hacker goes into a great deal of gory detail about how these things work, and how you might modify them. It's a very long read from end to end, but I...
Forum: Geothermal & Heat Pumps 02-17-12, 12:17 AM
Replies: 40
Views: 40,462
Posted By BradC
A couple of things. Propane is not a drop in...

A couple of things.

Propane is not a drop in for R134a. It has quite a bit higher pressure and finds weaknesses in systems quite quickly. A 60/40 mix of Propane/Iso-Butane gives about the same...
Showing results 1 to 25 of 34

 
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