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Reducing US Carbon Emissions to Zero Will Not Alter the Problem

Babykat said:
I no how frequency effect electrical circuits. I know it wouldn’t really effect v/c/w. I was just noting the difference between the frequency I use most of the time and the frequency used there. I do work with a lot of German engineers and sometimes work with 230v at 60hz. Although the frequency doesn’t effect efficiency it does effect how fast motors rotate. Those why we use VFDs on motors when we want to control there speed.


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Phase changes between so many grids is why we need to switch to HVDC as well, if we are to rely on renewable energy.
 
One of the equipment I work on uses VFDs I use takes a single DC power supply. One power supply at +/- 150 VDC This single power supply drives four VFDs. I've worked with such things for over 20 years and electronics as a profession since the early 80's.
 
Lord of Planar said:
Phase changes between so many grids is why we need to switch to HVDC as well, if we are to rely on renewable energy.
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I would agree with that. But that would require all new appliances and a complete electrical rebuild of the house. That’s why one of my first suggestions would be a harmonic filter.


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Babykat said:
I would agree with that. But that would require all new appliances and a complete electrical rebuild of the house. That’s why one of my first suggestions would be a harmonic filter.


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No it wouldn't. I mean for grid to grid. The main power stations in a city change back to DC. This way all power sources like fossil fuel, hydro, solar, wind, etc. can input from any long distance location and make a more stable infrastructure.

Are you familiar with path 65 and other HVDC links?

Pacific DC Intertie - Wikipedia
 
Lord of Planar said:
No it wouldn't. I mean for grid to grid. The main power stations in a city change back to DC. This way all power sources like fossil fuel, hydro, solar, wind, etc. can input from any long distance location and make a more stable infrastructure.

Are you familiar with path 65 and other HVDC links?

Pacific DC Intertie - Wikipedia
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Yes but you still have to rectify it back to ac before sending it into the home. Because standard house hold appliances run on ac not dc. I’m not arguing that dc is a much better. I know it is. But I was talking to the guy about his project which is a wind driven turbine. For single home use. It would be much better if the house was wired for dc and all new dc appliances where installed. But look up a dc HVAC unit and see how hard they are to get ahold of.


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Babykat said:
Yes but you still have to rectify it back to ac before sending it into the home. Because standard house hold appliances run on ac not dc. I’m not arguing that dc is a much better. I know it is. But I was talking to the guy about his project which is a wind driven turbine. For single home use. It would be much better if the house was wired for dc and all new dc appliances where installed. But look up a dc HVAC unit and see how hard they are to get ahold of.


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I think the HVDC lines are only for moving the power across long distances.
the homes and local grids are still all AC.
Slightly different subject but most of the inverter AC systems control the compressor with chopped DC.
Some of the solar companies are converting them to be direct DC rather than AC--DC-back to inverted AC.
DC Solar Air Conditioner Heat Pump | Solar Air Conditioning | Solar Heating | Manufacturers
 
Babykat said:
Yes but you still have to rectify it back to ac before sending it into the home. Because standard house hold appliances run on ac not dc. I’m not arguing that dc is a much better. I know it is. But I was talking to the guy about his project which is a wind driven turbine. For single home use. It would be much better if the house was wired for dc and all new dc appliances where installed. But look up a dc HVAC unit and see how hard they are to get ahold of.


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Modern home HVAC units use VFDs and and inverter duty motors anyway.

I think using 3 phase 208 would be better. Single phase, 120 volts, or two phases 208 for existing appliances. Large power capacity with less wire for the equipment to charge electric cars.
 
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Lord of Planar said:
Modern home HVAC units use VFDs and and inverter duty motors anyway.

I think using 3 phase 208 would be better. Single phase, 120 volts, or two phases 208 for existing appliances. Large power capacity with less wire for the equipment to charge electric cars.
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I work with a lot of different engineering groups do you mind if I ask which one you work for. I move between Flour, KBR, MMR, and IES. I have built power plants in my youth. But I mostly deal with automation now. I have a strong working knowledge of electrical magnetic theory.


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Babykat said:
I work with a lot of different engineering groups do you mind if I ask which one you work for. I move between Flour, KBR, MMR, and IES. I have built power plants in my youth. But I mostly deal with automation now. I have a strong working knowledge of electrical magnetic theory.


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I'm not doing the level of work I once did. I was eight years in semiconductor engineering. Rapid Research and Development for CMP equipment back in the 90's.
 
Lord of Planar said:
I'm not doing the level of work I once did. I was eight years in semiconductor engineering. Rapid Research and Development for CMP equipment back in the 90's.
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Semiconductors and superconductors are a very cool field of research. I’m not super versed in the subject. My field is mostly automation. I’m the guy the superintendent and engineering groups call when something doesn’t work right. Main power is very basic for me. On this guys localized wind turbine for single homes. My main suggestions would to generate 3 phase at like 480v then step it down to like 120v it would still be 3 phase. But by doing that you increase useable voltage. Then install a harmonica filter to stabilize the frequency. But I’m not sure what the medium voltage in the U.K. is. But I’m will versed in DC as well. I have worked on up to 480 volts of DC at 5,000 amps. It was for giant induction furnaces.


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Lord of Planar said:
I'm not doing the level of work I once did. I was eight years in semiconductor engineering. Rapid Research and Development for CMP equipment back in the 90's.
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CMP Chemical mechanical planarization?


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Babykat said:
CMP Chemical mechanical planarization?


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Yes. Back in '96 I was on a project doing the first 300mm wafers. Before that we were doing copper processes.
 
Lord of Planar said:
Yes. Back in '96 I was on a project doing the first 300mm wafers. Before that we were doing copper processes.
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Very cool silicon dioxide. I built a line process that produced the silicon based plastic used by Microsoft and just finished a line process for a silicon refining plant.


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LowDown said:
The US is already responsible for less than one third of carbon emissions. US reductions in emissions have been more than overtaken by increases by other countries.

This is not an excuse for the US to do nothing. We must continue efforts to get away from carbon fuels if for no other reason than carbon fuels are a limited resource. Also, technologies we develop may be applicable in other parts of the world.

Megan McArdle on Twitter: "Pushing the US economy to zero emissions won't
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Stunning revelation that the US is not, in fact, the only country on the planet. Thanks for the insight.
 
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