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Search: Posts Made By: marx290
Forum: Geothermal & Heat Pumps 11-20-16, 02:41 PM
Replies: 10
Views: 3,983
Posted By marx290
Wow! A few days away from the computer, and a...

Wow! A few days away from the computer, and a nice little conversation ensued. I don't have a strong opinion about reciprocating versus rotary. I would have to agree with SteveHull about the...
Forum: Geothermal & Heat Pumps 11-20-16, 02:29 PM
Replies: 10
Views: 3,983
Posted By marx290
Went to long on a single post!

The next two are pretty recent. The hyperboloid condenser was neat looking, but it didn't have enough tubing or surface area to effectively dissipate the heat. Saturation temperatures on the high...
Forum: Geothermal & Heat Pumps 11-13-16, 11:00 AM
Replies: 10
Views: 3,983
Posted By marx290
Building a 100 Year Refrigerator

Haven't been on the forum in some time; I have been busy. Began a project in June to construct a modular, long lasting refrigerator. It has gone through many iterations, and there are many more to...
Forum: Geothermal & Heat Pumps 09-26-15, 12:10 PM
Replies: 9
Views: 5,986
Posted By marx290
Thanks Jeff. It is an interesting thread. My...

Thanks Jeff. It is an interesting thread. My little compressor is going to need some special attention when it comes to the oil. I will most certainly consider building a better draining system,...
Forum: Geothermal & Heat Pumps 09-26-15, 11:46 AM
Replies: 158
Views: 25,151
Posted By marx290
That is great! I wasn't sure if it would work. ...

That is great! I wasn't sure if it would work. My best plan of attack for a oil return, was a sort of vortex separator on the discharge of the compressor, where oil would tend to fall to the...
Forum: Geothermal & Heat Pumps 09-26-15, 11:34 AM
Replies: 158
Views: 25,151
Posted By marx290
Check out the ASHRAE series of books, especially...

Check out the ASHRAE series of books, especially the Fundamentals years. My early nineties copy, lists many properties of propane, butane, isobutane, and many others. They also have beautiful...
Forum: Geothermal & Heat Pumps 09-24-15, 08:02 PM
Replies: 9
Views: 5,986
Posted By marx290
AC_Hacker, I will probably look into a better...

AC_Hacker, I will probably look into a better speed control. Perhaps, once I build refrigerator, or something like that, I will be more interested in variable speed. I am mainly interested in the...
Forum: Geothermal & Heat Pumps 09-22-15, 03:24 PM
Replies: 9
Views: 5,986
Posted By marx290
Thanks, AC_Hacker! I'm not doing much in the way...

Thanks, AC_Hacker! I'm not doing much in the way of varying the speed; running with all the power this little baby will take! There is a small potentiometer on the control board that allows me to...
Forum: Geothermal & Heat Pumps 09-21-15, 12:58 PM
Replies: 9
Views: 5,986
Posted By marx290
Talking Mini Brushless DC Compressor

A friend of mine recently acquired a small brushless DC compressor for me to work with. He would like to develop some mobile cooling devices for a teardrop trailer he is planning. I was going to...
Forum: Appliances & Gadgets 09-18-15, 10:47 AM
Replies: 81
Views: 30,024
Posted By marx290
I think where my curiosity peaks, is in trying to...

I think where my curiosity peaks, is in trying to evaluate the performance of a cap tube system designed to operate at around 0 to 10 degrees F, which is never allowed to drop below freezing. So...
Forum: Appliances & Gadgets 09-17-15, 12:28 PM
Replies: 81
Views: 30,024
Posted By marx290
As I understand it, one of the properties which...

As I understand it, one of the properties which made sulfur dioxide such a good refrigerant, was that it acts as an excellent lubricant in the compressor and miscibility problems with the compressor...
Forum: Geothermal & Heat Pumps 09-17-15, 11:12 AM
Replies: 21
Views: 4,430
Posted By marx290
dhaslam, I hear what you're saying with freezing...

dhaslam, I hear what you're saying with freezing pipes. I don't really have that problem here, but I can see how warm wastewater could be needed.

I haven't messed with the evacuated tubes yet,...
Forum: Geothermal & Heat Pumps 09-16-15, 08:08 AM
Replies: 21
Views: 4,430
Posted By marx290
Has anyone in the Ecorenovator world seen a...

Has anyone in the Ecorenovator world seen a residential HPWH that recovers energy from a home's waste water stream? It always seemed to me, that the time a water heater "calls for heat", is likely...
Forum: Geothermal & Heat Pumps 09-10-15, 10:08 AM
Replies: 217
Views: 42,307
Posted By marx290
Yeah, I wouldn't suppose a HPWH with a 150 watt...

Yeah, I wouldn't suppose a HPWH with a 150 watt compressor, is going to have much capacity for heating. The recovery time is going to be very long. Seems almost absurd to attempt it....almost. I'm...
Forum: Geothermal & Heat Pumps 09-09-15, 08:20 PM
Replies: 2
Views: 1,194
Posted By marx290
I would agree with that assessment, Cassie. As...

I would agree with that assessment, Cassie. As long as these machines are designed to be reversible, they will not be optimized very well for either function. From what I've seen of air to air...
Forum: Geothermal & Heat Pumps 09-09-15, 03:18 PM
Replies: 217
Views: 42,307
Posted By marx290
I have a feeling that this small DC compressor...

I have a feeling that this small DC compressor stuff should spawn a thread of its own. A friend of mine just ordered one of the small Chinese made compressors from eBay. He lacks brazing experience...
Forum: Geothermal & Heat Pumps 09-07-15, 06:10 PM
Replies: 217
Views: 42,307
Posted By marx290
After a bit more research, I found some other...

After a bit more research, I found some other manufacturers of small DC compressors. Some of these are really small, and probably not suitable for a heating application, but look like fun...
Forum: Geothermal & Heat Pumps 09-07-15, 12:30 PM
Replies: 11
Views: 2,792
Posted By marx290
Hey all! I've been busy in the shop; no time to...

Hey all! I've been busy in the shop; no time to write! The ejector project is coming along nicely. To date, the highest compression I've achieved is about 10 psi, but that was at a fairly low mass...
Forum: Geothermal & Heat Pumps 09-07-15, 11:43 AM
Replies: 21
Views: 4,430
Posted By marx290
Whoa! This thread went off the deep end fast! ...

Whoa! This thread went off the deep end fast! Great analogy, AC_Hacker.

One of the reasons my wife and I left Appalachia, was to get away from the fracking. Most people were salivating at the...
Forum: Geothermal & Heat Pumps 09-03-15, 10:11 AM
Replies: 27
Views: 4,516
Posted By marx290
Haha. This thread greatly entertaining! ...

Haha. This thread greatly entertaining!

As you can tell by my username, I'm a big fan of propane as a refrigerant; it is cheap, and has some great properties. But, we need be realistic: HD-5...
Forum: Geothermal & Heat Pumps 09-01-15, 04:31 PM
Replies: 217
Views: 42,307
Posted By marx290
My friend is interested in getting one of these: ...

My friend is interested in getting one of these:

Small Volume 12V DC Tiny Compressor for Air Conditioner Refrigerator | eBay...
Forum: Geothermal & Heat Pumps 09-01-15, 10:25 AM
Replies: 217
Views: 42,307
Posted By marx290
Very nice work MEMPHIS91! I have enjoyed reading...

Very nice work MEMPHIS91! I have enjoyed reading this thread, and all the support this community provided is really inspiring! Just to throw my two cents in, I think the battery and PV capacity is...
Forum: Geothermal & Heat Pumps 08-29-15, 10:35 AM
Replies: 11
Views: 2,792
Posted By marx290
Thanks Kurt! I'll keep it in mind. I'd like to...

Thanks Kurt! I'll keep it in mind. I'd like to make convergent / divergent motive nozzles, but it's a tall order at these small sizes. I might try choking down a larger piece of cap tube, but will...
Forum: Geothermal & Heat Pumps 08-15-15, 12:14 PM
Replies: 18
Views: 3,276
Posted By marx290
I've got to agree with Jeff, Mechanic. That...

I've got to agree with Jeff, Mechanic. That configuration is going to produce a lot of superheat. The system either needs more refrigerant and/or a less restrictive metering device. That is a lot...
Forum: Geothermal & Heat Pumps 08-15-15, 11:54 AM
Replies: 11
Views: 2,792
Posted By marx290
Here's a little information on assembling my...

Here's a little information on assembling my ejector system, and some preliminary results. It's a lot of fun!

Ejector Assembly Construction | musings on entropy...
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