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Search took 0.00 seconds. Search: Posts Made By: NiHaoMike
Forum: Geothermal & Heat Pumps 08-31-14, 10:56 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
In the specific case of the condensing unit, it...

In the specific case of the condensing unit, it will only switch into full wave mode at lower speeds, where the load is a fraction of full speed.
Forum: Geothermal & Heat Pumps 08-31-14, 09:49 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
Those three wires are already brought into most...

Those three wires are already brought into most homes. I do agree that the application potential is limited as it has to be a device that needs a 240V circuit but internally does better with about...
Forum: Geothermal & Heat Pumps 08-31-14, 07:10 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
Something unique about 120/240V "split phase"...

Something unique about 120/240V "split phase" (really center tap) is that with only two diodes, it can be turned into 170V peak DC (with a normal PFC stage afterwards if needed) and end up with half...
Forum: Geothermal & Heat Pumps 08-30-14, 10:42 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
AC to DC is the easy part - just a bunch of...

AC to DC is the easy part - just a bunch of diodes and capacitors can do the trick. The reverse is quite a bit more complex.

In the case of a data center or other large, mostly DC loads, PFC...
Forum: Geothermal & Heat Pumps 08-26-14, 06:50 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
Look up "HVDC data center". In that context, 380V...

Look up "HVDC data center". In that context, 380V is a common system voltage. It's very unlike the hundreds of kV HVDC transmission lines.

If the AC to DC conversion is done in one place, that...
Forum: Geothermal & Heat Pumps 08-25-14, 11:41 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
The point was DC power distribution in a building...

The point was DC power distribution in a building or at most a small cluster of buildings, not long distance. 380V DC is becoming increasingly common in data centers and many off grid houses have DC...
Forum: Geothermal & Heat Pumps 08-25-14, 10:28 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
And then someone finds a practical solution to...

And then someone finds a practical solution to the arcing issue with HVDC (380V or so), making PoL PFC obsolete. HVDC just makes a lot more sense when most (residential scale) alternative energy...
Forum: Geothermal & Heat Pumps 08-25-14, 09:59 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
Cadmium telluride photovoltaics - Wikipedia, the...

Cadmium telluride photovoltaics - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Cadmium_telluride_photovoltaics)

If that still bothers you, stick to the silicon based panels.
...
Forum: Geothermal & Heat Pumps 08-25-14, 09:28 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
No, he did it well before I found the video. ...

No, he did it well before I found the video.
R134a heat pump in heating mode (short) - YouTube (http://www.youtube.com/watch?v=Oi5L_9mmmpI)
He's actually very knowledgeable about HVAC and power...
Forum: Geothermal & Heat Pumps 08-25-14, 06:46 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
That particular VFD did not have PFC. In fact, it...

That particular VFD did not have PFC. In fact, it was a 480V VFD being run off a voltage doubler since he managed to get a 480V condensing unit (and the VFD to run it) for super cheap.
Forum: Geothermal & Heat Pumps 08-24-14, 10:22 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
In one video where someone installed a VFD on a...

In one video where someone installed a VFD on a central A/C, the amperage draw went down, not just the wattage. Granted that was under a specific set of conditions (no doubt including an A/C that was...
Forum: Geothermal & Heat Pumps 08-21-14, 10:07 PM
Replies: 51
Views: 33,083
Posted By NiHaoMike
Work out what the power factor of a non PFC...

Work out what the power factor of a non PFC rectifier load would be if you gave it a square wave. (Answer: exactly 1)

Granted, that's a theoretical result only as a true square wave (with infinite...
Showing results 1 to 12 of 12

 
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