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Search: Posts Made By: NiHaoMike
Forum: Geothermal & Heat Pumps 01-01-14, 06:32 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
Water has a very high critical temperature and...

Water has a very high critical temperature and very low (vacuum) operating pressures. The latter presents many problems in making a practical system. Even small pressure drops are significant, so...
Forum: Geothermal & Heat Pumps 01-01-14, 04:23 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
CO2 systems generally operate in the...

CO2 systems generally operate in the supercritical region by design, although the pressures involved are high enough to make DIY impractical. At the other extreme, water vapor operates at too low of...
Forum: Geothermal & Heat Pumps 12-31-13, 04:50 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
It has to stay within the high pressure limit and...

It has to stay within the high pressure limit and the discharge temperature limit. A R410a compressor is going to be rated for a very high pressure (400PSI is considered a "normal" high side...
Forum: Geothermal & Heat Pumps 12-31-13, 03:48 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
For some reason, most US HVAC techs freak out...

For some reason, most US HVAC techs freak out about the "danger" of hydrocarbon refrigerants, yet have little concern about the even more flammable Lithium batteries everywhere. I have a clue it has...
Forum: Geothermal & Heat Pumps 12-31-13, 09:04 AM
Replies: 34
Views: 32,959
Posted By NiHaoMike
R22 works fine with POE oil. I believe the issue...

R22 works fine with POE oil. I believe the issue with PAG oil is its low breakdown voltage, so it's best to avoid any of it in a high voltage compressor.
Forum: Geothermal & Heat Pumps 12-30-13, 10:28 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
It will not excessively heat the cold water line....

It will not excessively heat the cold water line. If you use a reversible pump, the control circuit stops the pump as soon as it senses that the hot line has become hot. (That's how most hot water...
Forum: Geothermal & Heat Pumps 12-30-13, 06:59 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
The unit is the heat pump. As for how it can work...

The unit is the heat pump. As for how it can work as a hot water recirculation setup, if you have it connected to the hot and cold lines under the sink, you can run the pump to move the cold water in...
Forum: Geothermal & Heat Pumps 12-30-13, 06:10 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
The amount of cold water sitting in the lines is...

The amount of cold water sitting in the lines is the same regardless of the temperature in the tank.
Also, if you plumbed the unit into the hot and cold lines under the bathroom sink, it can also...
Forum: Geothermal & Heat Pumps 12-30-13, 05:32 PM
Replies: 34
Views: 32,959
Posted By NiHaoMike
Why R134a instead of R290 or R433b/ES22a? What...

Why R134a instead of R290 or R433b/ES22a? What you essentially did was a double "Davuluri Treatment". Your max temp is going to be limited by the discharge temperature limit of the compressor, for...
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