Wasted heat

[Industrial Toys]

This actually is the companion to that BIG NG set, used for night time service. Keeps computers in the Office, Laser cutters and so forth powered up during the night. Waste heat also put into the various slabs.

 

[nyone]

Aaa the grand dreams of free power....

 

[BrokenTrack]

If you use genset all Winter, go ahead and add suitable heat-exchanger to you heating loop and shunt the coolant into it just to see what's up. Electric load/output will likely vary more than heat output and fuel use/hr. (frictional losses, other real inefficiencies)

I suggest that the general idea is more sensible than silly. What to do with excess Kw, or on the coldest days? Run electric heaters at the cost you'd get the grid to pay you to feed back. When you don't need the heat, grid power saves gen fuel/oil, allows service.

Cold days, run the genset and coast thru the night (heat, as said) on-grid for clocks, office UPS, etc. KISS by switching elec source by human decision when firing up the gen, say vs ever expecting automatic stuff to know when you'd like to bump the thermostat on a dreary day or whatever.

I say don't overthink the complexity. Three separate but SxS controls, I imagine. 1) Switch power from grid to gen. (have it anyway?) 2) Switch/valve to shunt 'spit' loop 3) Switch to start gen. Build separately, and instruct to operate separately-but-in-unison. Your youngest could switch 'em with a holler from the other room. (If it looks like a good long-term plan, add sophistication/automation as time and budget allow tech tweaks.) btw, such a project/prototype sounds easy for a guy like BT.

That is kind of how I see it too. Start small, keep it simple, and then add in stages as you go.

I am not sure if the power company would take the power or not because it is not alternative power, but rather fossil fuel derived. But net-metering is a sweet deal. They basically "buy" your power at retail rates.

It is not actually money that changes hands, but "credits". My Uncle has a windmill on net metering, and saves about 50% of his power. When he is over-producing power, every KW he produces for the grid, gets a "credit." When his windmill does not produce enough power, he has to trade those credits in. If all his credits are used up, then he obviously has to pay the electric company the extra kw's he uses.

This is a sweet deal for net-metering people like my uncle because they are getting retail prices (in the form of credits) for their wholesale power. So here in Maine, that price is 16 cents per KW, which is pretty high. But who knows how long that would last. We had net-metering, got a new governor and so it reverted back to wholesale-metering, then when he got replaced, it swapped back to net-metering again. That is because regular consumers, and the power company hate-net metering, but small scale power producers love it.

 

[BrokenTrack]

It's all doable, I would try to avoid back feeding the utility.
Mainly because of the synchronizing issues, I'm not sure how the solar units do this but I would
assume that the utility is controlling the inverter that is changing the solar DC to utility AC,
this has to be the same frequency and a slightly higher voltage to backfeed the utility.
A home generator or commercial unit will not have these abilities.
As far as recovering the engine heat that is quite doable and would be dollar sensible,
I'd be tempted to place a controlled 3 port valve that in one position would feed the floor
the other would go thru a radiator to control the engine heat.
Would this be less expensive then utility power I seriously doubt it.

I was curious about synchronizing as well. When I was working for the railroad, that was always tricky, getting the multiple unit to sync just right. A few times I got the frequency off...but this was AC Drives and not DC. The DC Locomotives were much simpler, but wheel slip was a lot more of a problem then with the AC ones. Those AC Loc's would often break the couplers before they would wheel slip or drop out.

Fun times, but that is going back a few years. But neither AC or DC would wheel slip like this bad boy! (LOL)

 

[DarkBlack]

You can not hook a diesel powered generator to the grid. You have no means of keeping it synchronized. In any case , it would not be allowed as not legal due to RICE stationary ICE laws which are extremely tight the last years. Lastly it would surely cost more than just buying the electricity.

 

[Grumpycat]

Your gen set only produces as much power as is consumed. And the prime mover supplies all of it, plus some more to accommodate loss.

If that is true then the diesel engine would consume no fuel when idling.

The past 10-20 years of innovation in small gensets has focused on the use of inverters. Allows the engine to run at slower speeds when less electrical power is needed so as to save fuel.

 

[Grumpycat]

You can not hook a diesel powered generator to the grid. You have no means of keeping it synchronized. In any case , it would not be allowed as not legal due to RICE stationary ICE laws which are extremely tight the last years. Lastly it would surely cost more than just buying the electricity.

Well, it is difficult and the tools to do the job are not commonly sold over the counter.

EPA has regulations on emissions for equipment generating grid power requiring fewer emissions than any diesel, no matter DPF or SCR/DEF. Decades ago the Nuclear Regulatory Commission ordered backup generators be exercised every month under load. EPA would not allow the power to be placed on the grid due to the emissions but couldn't prevent the generator from being run. Typical government SNAFU: one agency said you must run the generator, the other said you can't use the generated power. So with no other option the local TVA nuclear plant had to build cooling ponds and huge load resistors to dissipate the electrical power their two stationary locomotive engines generated during monthly tests. This is one of many things the Reagan EPA corrected. Was only common sense that no one would run the diesel locomotives to sell power to the grid, the cost of running the engines was greater than the value of the electricity produced.

 

[Grumpycat]

This is a sweet deal for net-metering people like my uncle because they are getting retail prices (in the form of credits) for their wholesale power. So here in Maine, that price is 16 cents per KW, which is pretty high. But who knows how long that would last. We had net-metering, got a new governor and so it reverted back to wholesale-metering, then when he got replaced, it swapped back to net-metering again. That is because regular consumers, and the power company hate-net metering, but small scale power producers love it.

It is a sweet deal. Too sweet. Federal law only requires the utility pay the audited incremental cost of generating a kWh. For TVA that is $0.015. A penny and a half. Effects of Obama's Save The Earth Greenies are fading and come January 1, 2020 the TVA Green Power Provider rate will go from $0.090 (for under 10kW systems) to $0.015 for new systems.

If the utility can generate a kWh (not kW, but a kW for an hour) for only 1.5¢ then why should it pay someone else more than that? Under TVA systems TVA runs the electric production and local "utilities" buy power from TVA and maintain the local power grid. The locals have to get paid for their wires somehow, so that is the difference between the price TVA gets paid the the utility charges end users.

 

[BrokenTrack]

The utilities are all in a deep death spiral now as far as I can tell.

The whole problem is that they get paid on a consumed scale. As technology moves forward, and things become more and more economical, that means the average consumer is using less electricity for their home. However their cost of getting electricity to the homes keeps going up: labor, fuel, material costs, etc. So they have no choice but to ask for a rate hike. When they get it, the consumers have more drive to buy even more things that will save them on electrical consumption to get their electric bill down. When enough people do that, the electric company has no choice but to ask for another rate hike...and on and on it goes.

People producing electricity for themselves, no matter how that looks, only makes the matter worse.

Maine has had two rate hikes in the last two years. There is talk now about going to a flat fee, where consumers are not charged by the kilowatt consumed. That certainly has its own concern for sure. I have always wondered how that will work for the people that are 100% off-grid, or people like my Uncle who produce about half his power for the grid. Will it be like some water districts where if they go past your home, you are required to hook up to it, like in the power line case, if the grid goes by your home, you must pay the fee whether you use the power or not? I am not sure.

But if anyone has been watching (and very few people have) the utilities are in a horrible death spiral, and have been for awhile. The cost of maintaining the powerlines HAS to keep going up, and with more and more electrical production going homeowner sized, and more efficient lightbulbs and electrical appliances, the consumption per home is going down. The wide spread use of heat pumps has helped take the edge off for utilities, but it is inevitable that another technology will come along. As is, we are on the verge of having whole-house battery technology that will make the grid obsolete.

 

[BrokenTrack]

The thing with these situations (co-generation) is that it is not IF the idea will work, but on whether or not that is the best way to get the the result.

I remember a few years ago talking to the Maine Dept of Planning, and discussing Compost Heat, and whether it would work to heat my house. Again, all I need is 100-150 degree water in my main boiler loop. Compost heat is great because it is 140 degrees, for months on end.

Anyway I had that man, and quite a few more tell me, "If it could be done, everyone would be doing it."

Well they were wrong, Jean Pain of France was a forester that had been heating his house from the 1970's using compost heat.

I did a lot of research on that, and concluded that while it would be 100% possible for me to use compost heat to heat my home all winter, in the same amount of time that it would take me to form the pile, running the pipes through the pile, etc, I could just cut my firewood, or cut firewood for someone else tree length, and buy my propane. Now that I am using wood pellets, the same thing applies.