Making my own 20 KW Genset

[BrokenTrack]

I thought it would of been in bad form to comment. Even to compliment.... I assumed it was akin to attractive WWII aircraft nose art and left it at that out of respect......

Am I wrong for having this point of reference?

That photo was kind of interesting. The guys on the Coal Forum had helped me get the boiler installed properly, and they had seen my wife in other photos, and so one innocently joked, "Hey, get a picture of your boiler. Wait, get a picture of your wife and your boiler and we will see which one is better looking."

It was all said in good fun, so when I told Katie, she said she would pose beside the boiler, and went and put on her Little Red Dress and posed for some photos. I thought that that was good of her because she knew I was going to share them with the guys on the coal forum.

But we are farmers, so when we go to town, in order to shed the denim-overalls, and shuck of straw between the two gapped teeth look, we dress up, often being the best dressed people at a restaurant. So, it's not like Katie has not worn that Little Red Dress in public before. Still, the men do not say much, but their wives sure have some snide comments.

The interesting part was, when that photo was taken, she was in her mid thirties, and taken just after the birth of our fourth child.

 

[BrokenTrack]

Fatal flaw in your engineering math. Mechanical energy doesn稚 magically become heat energy. Loss from conversion is high.
While using the waste heat from the engine will work you will not have the btus you calculated. You are only recovering the btus from your engine cooling system.

That is true, but it is still enough. And I have actually included those losses in my calculations.

I did some research and found out that by design, 90% of the heat from an engine is absorbed by the water jacket, with 10% going up the stack. That is why I came up with an engine as having a heater efficiency of around 65%. That is pretty dismal considering my propane, Stainless Steel, Condensing Boiler has an efficiency of 95%. So an engine would make a very poor heater for sure.

BUT it is still free heat. If a person is looking for electricity, then capturing the generated heat is thus free, and put to good use. Or it could be vise versa. If they are looking for heat, then the electricity produced is thus free. Combined, it puts the efficiency at around 87%. Not bad, an 87% efficient boiler would be considered very good. Still, this is not a new concept. High Pressure Steam Boiler Houses have been using turbines as Pressure Reducing Stations since the 1920's. With a return on investment of less than a year, it just makes sense.

But to put this in a real world situation: what would happen if I parked an engine just outside of my home's window, then directed all the air from the radiator into the house? Would that engine heat my home, and the answer is "of course it would."

An even more important question is: how long would it take to do that? And the answer is, 8 hours on the coldest day of the year.

Now granted I have some built in efficiencies since I have a super insulated home, and radiant floor heat. With the latter there is no real heat transfer until it gets put into my pex-laden concrete floors. In that way, I am just taking water heated at the engine, and moving it to the floor of my house, so it would be much more efficient then my radiator in the window example.

And why not? If I am going to be operating my generator, why send that heat out through the radiator? How hard is it to put 100 feet of line from the boiler room of my house, to the engine of the generator? Then it is just a matter of throwing in a circulating pump, a high point vent, some isolation valves, and some wiring. It really is not complex or expensive to do so why not do it?

 

[Smokeydog]

I think you are very enthusiastic and spent time thinking about this. You have good skills and are knowledgeable. I agree there is waste heat from an engine. I don’t agree with your calculations but don’t let that stop you.
When you make your connections it would be easy to add thermometers on the supply and return lines and a flow meter. Then you can calculate input btus to your floor. You have to be careful your floor system doesn’t heat your engine’s radiator. You have to spend money to pump that free heat. Then we would have some common ground to compare.

Most folks find it simpler and efficient to put excess generator wattage into cal rods and heat the floor water directly. Low loaded generators are less efficient and hard on engines.

We can run our home on 2400watt inverter generator 8hrs/1.6gal of gas during power outages. Refrigerator, freezer, some lights, phone, Internet, tv, microwave, and wood stove fan. Some not all at once. Only 10% of your needs.
Wish you the best and thanks for sharing.

 

[BrokenTrack]

I think you are very enthusiastic and spent time thinking about this. You have good skills and are knowledgeable. I agree there is waste heat from an engine. I don稚 agree with your calculations but don稚 let that stop you.
When you make your connections it would be easy to add thermometers on the supply and return lines and a flow meter. Then you can calculate input btus to your floor. You have to be careful your floor system doesn稚 heat your engine痴 radiator. You have to spend money to pump that free heat. Then we would have some common ground to compare.

Most folks find it simpler and efficient to put excess generator wattage into cal rods and heat the floor water directly. Low loaded generators are less efficient and hard on engines.

We can run our home on 2400watt inverter generator 8hrs/1.6gal of gas during power outages. Refrigerator, freezer, some lights, phone, Internet, tv, microwave, and wood stove fan. Some not all at once. Only 10% of your needs.
Wish you the best and thanks for sharing.

Hey thanks, I try and put a lot of thought into what I do before I do it.

As for thermometers and flow controls, I do have them. I was not home when they ran the pex for my floor so they ran various lengths, where as I keep each loop the exact same. That meant not only do I have flow controls, I have flow controls for EACH loop. Kind of crazy, but it was what I had to do to balance the system. I also added a 3 speed TACO metering Valve for the same reason: I did not know what I needed for flow!

But my flow is very variable. It is set by the PLC basing that number on the outside temp, temp in the slab, return manifold temp, zone temp, and target temp.

The modulating, condensing boiler I have could do this, but I knew I would add a firewood/coal boiler at some point, and knocking down high heat with a Line Deheater seemed stupid to me. Why use cold water to knock down high temp water when it cost money to make hot water in the first place, so I went with a metering valve instead.

But by doing that, it sets me up nicely to use engine heat. As long as I keep my primary loop from 100 to 150 degrees, my back-up boiler will not come on, and the engine operates above that.

This is my radiant floor heating system:

 

[Peter 315]

Who put that system in Mario and Luigi.....:laughing:

 

[BrokenTrack]

Who put that system in Mario and Luigi.....:laughing:

I am not sure who they are???

 

[LouNY]

Nice setup, I hope you have a good schematic of it along with the directions to control and set it up.
If something ever happens and some else has to work on it they would waste a lot of time getting up to speed.
I haven't finished mine and it's simpler then yours but nobody else could work on it efficiently.

 

[stingray1]

And finally, this is the Firewood/Coal boiler that is sitting next to the genset.

The good thing about the way this whole thing will be set up is; if the engine is down, or the firewood/coal boiler is not being used, the propane boiler in my house will come on, and circulate warm water back through the boiler and engine, and keep them always at 100-150 degrees. That will make the engine easy to start anyway. (Naturally, being a reefer engine, it has exceptionally powerful glow plugs).

View attachment 644327

That would definitely keep you warm.:licking:

 

[dstig1]

Ha! A man after my own heart.... here's mine:



Edit - that one was before the controls were hooked up. Here they are, positioned between the heaters and the tubing:

 

[BrokenTrack]

Nice setup, I hope you have a good schematic of it along with the directions to control and set it up.
If something ever happens and some else has to work on it they would waste a lot of time getting up to speed.
I haven't finished mine and it's simpler then yours but nobody else could work on it efficiently.

The short answer is...no, I do not.

The longer answer is, a few years ago I decided I loved radiant floor heat so much that I would include the front half of the house that was built before radiant floor heat was really well used. The back half of the home had been built after radiant floor heat was well known, so I had half a house on conventional heat, and the back half of the house as radiant floor heat.

But that doubling of size threw off how the system was balanced. I called in (2) different heating techs, four guys in all, and they could not figure it out.

The guys over on the Coal Burning Forum were like, "No one is more motivated to fix this than you, so go for it." So I was grateful for that piece of advice, and in the end I had to go back to my manuals, and reading it through a few times, I figured it out.

But I am slow like that. It takes me a few times to understand things, and how to change things, particularly in the PLC or on programming the boiler parameters. But I did get it eventually. In that way, I am a "chewer", and have to mull things over for awhile.