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Search took 0.01 seconds. Search: Posts Made By: NiHaoMike
Forum: Geothermal & Heat Pumps 07-26-15, 11:28 AM
Replies: 44
Views: 34,590
Posted By NiHaoMike
Here's a picture of the control electronics: ...

Here's a picture of the control electronics:
http://i58.tinypic.com/2j162ox.jpg
There's a 250MHz Jessica Simpson network processor running OpenWRT and an 80MHz dsPIC running FreeRTOS. I initially...
Forum: Geothermal & Heat Pumps 03-23-14, 07:22 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
If the second TXV sources from the first TXV,...

If the second TXV sources from the first TXV, there would be less flow to operate the ejector. And thus a lower efficiency. I can assure you the ejector works since the second evaporator gets colder...
Forum: Geothermal & Heat Pumps 03-23-14, 10:06 AM
Replies: 44
Views: 34,590
Posted By NiHaoMike
Here's the refrigerant flow diagram: ...

Here's the refrigerant flow diagram:
http://i57.tinypic.com/vqoevq.png
The ejector is a MIG welding tip brazed into a tee. The extra TXVs are for the reduced pressure zone and vapor return. The...
Forum: Geothermal & Heat Pumps 03-22-14, 09:17 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I'm working on the firmware. The dsPIC is running...

I'm working on the firmware. The dsPIC is running FreeRTOS and does all the low level control. At this point, it is able to run, but the PID loops need tuning. Also, some features still have to be...
Forum: Geothermal & Heat Pumps 11-26-13, 02:57 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I rooted every Android device I have owned within...

I rooted every Android device I have owned within a day of receiving them, often running a custom ROM if there's a good one out there. (The Jessica Simpson board runs OpenWRT instead of Android, but...
Forum: Geothermal & Heat Pumps 11-25-13, 09:04 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
It's pretty cold (by Texas standards anyways) at...

It's pretty cold (by Texas standards anyways) at the moment so I have a lot of time to work on the software. Once warmer weather is back, I'll be able to do a proper test and tune all the control...
Forum: Geothermal & Heat Pumps 11-25-13, 03:31 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I'm working on the control software. At this...

I'm working on the control software. At this point, I can "run" it by manually adjusting the water pump and fan speeds, good enough to prove that it works but not very practical. Can't get any real...
Forum: Geothermal & Heat Pumps 09-07-13, 01:05 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
http://i43.tinypic.com/29fp3qu.jpg The...

http://i43.tinypic.com/29fp3qu.jpg
The condenser didn't fit in the original case, so I put it in an old 2U rack server case and mounted the A/C on top of it. There are two extra TXVs (dirt cheap...
Forum: Geothermal & Heat Pumps 09-05-13, 08:05 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I have enough done to get it running, but it...

I have enough done to get it running, but it needs the controls to be usable.
Forum: Geothermal & Heat Pumps 07-13-13, 12:03 AM
Replies: 44
Views: 34,590
Posted By NiHaoMike
They do have a lot of low prices on parts, but...

They do have a lot of low prices on parts, but they don't calculate the shipping until after you have placed the order! Are they yet another "jack up the shipping costs so we can list attractive...
Forum: Geothermal & Heat Pumps 07-08-13, 07:51 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
It's sort of a mix of those two designs. It's...

It's sort of a mix of those two designs. It's going to be similar to the first one with an extra evaporator between the phase separator and compressor, along with a bypass so gas can go directly to...
Forum: Geothermal & Heat Pumps 07-07-13, 08:45 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
The heat exchanger I plan to use is this: ...

The heat exchanger I plan to use is this:
B3-12A 40 Plate Heat Exchanger with M5-.08 Mounting Studs [HX1240] | DudaDiesel Biodiesel Supplies (http://www.dudadiesel.com/choose_item.php?id=HX1240)
...
Forum: Geothermal & Heat Pumps 07-06-13, 11:54 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I'm going to be making the ejector from copper...

I'm going to be making the ejector from copper tubing. There will also be a phase separator to allow the gas (boiled off in the secondary evaporator) to flow directly to the compressor, currently...
Forum: Geothermal & Heat Pumps 06-24-13, 07:56 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
Just got the donor window A/C, a $100 Walmart...

Just got the donor window A/C, a $100 Walmart special GE. The compressor is a Rechi, which is actually a pretty good unit. I went with a R410a unit since the compressors are designed for higher...
Forum: Geothermal & Heat Pumps 06-11-13, 07:30 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
It's going to use the existing water heater as a...

It's going to use the existing water heater as a storage tank. There will be a wireless sensor for checking the water heater temperature. (Think of it as similar to the Airtap, but located distant...
Forum: Geothermal & Heat Pumps 06-10-13, 10:53 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
Laing D4 (aka mpc650) pcb mod...

Laing D4 (aka mpc650) pcb mod (http://www.xtremesystems.org/forums/showthread.php?279742-Laing-D4-%28aka-mpc650%29-pcb-mod)
http://www.honigtopf.mynetcologne.de/D5internal.JPG
It looks like the...
Forum: Geothermal & Heat Pumps 06-09-13, 11:18 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
I installed OpenFOAM on my PC to try to simulate...

I installed OpenFOAM on my PC to try to simulate the ejector, but there sure is quite a learning curve! (I'm definitely going to ask some friends who have studied chemical or mechanical engineering.)...
Forum: Geothermal & Heat Pumps 06-08-13, 11:08 PM
Replies: 44
Views: 34,590
Posted By NiHaoMike
DIY dehumidifier/air conditioner/heat pump water heater

I noted that even during the peak of Texas summer, the cold water is still too cold to shower with, especially in the morning. So why not use a heat pump to dehumidify the house (and provide a little...
Showing results 1 to 18 of 18

 
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