Micro CoGen.

The exhaust will flow through the small tubes and the water will flow around them.

Naturally I haven't taken a finished photo yet but hopefully soon You cannot view this attachment.

id love to see bob chime in on this. Ive seen lots of talk of what he has come up with but yet to actually see any picture?

Im currently working on building a SS shell in tube exhaust heat exchanger. Hopefully ill be posting pictures soon

Is that 3.5kw at the 1800 rpm? I thought that out put would be more in the 2600-2800 range?

Might be getting a different ac compressor. I recently learned that some newer cars have a variable displacement compressor. Means it spins all the time but you can control the output like you can with an alternator. That will play nice with charging batteries and cooling/heating loads..

a few pics of the turd... lol lots to do still. i have a 5kw 240v gen head that id like to get in this thing. im going to try to design a way to put an autmotive ac clutch on it so i can turn it off when not in use.  still in the layout stages obviously. just trying to make sure i have room for 3 FPHE and an exhaust HE.

thanks for some input. i had planned on using FPHE for the coolant side of things. just wasnt sure on a size and number of plates. i was leaning towards a 3"x7.5" with 30 plates. i can get one for 60usd shipped. as for the exhaust side i figured i would end up making something. the water misting idea is an interesting idea for keeping it clean.

I'm in the process of putting together my trigen. I'll have a few different heat exchangers and I need some help with that..

I've got a Kubota z482 it's a 2cylinder liquid cooled diesel at apporox 13hp. I want to recover the coolant and exhaust heat for heating house and domestic water.. I know most of you have "build threads" on here but most are scrambaled and missing pictures..

I basically want to know your motor, load, and what size and or kind of heat exchangers you are using..

Any info would be appreciated

Rob

So I found a source that says most compressors run at 2400rpm.. if that's true that changes the 13kbtu unit to 43000 cc a min.
That also changes the rpm of the car ac to around 1200 and that drops motor rpm way to low.. wish I would have done all this math sooner lol but I'm going to try it anyway

So some general info.. from what I've found a 13k btu r22 compressor has a 18cc capacity per revolution. Assuming it runs at 3600rpm (I can't find what speed it runs at) that turns into 64,800 cc a min for 13kbtu. The car ac compressor is between 100-120cc per revolution. To get to 3 tons heating/cooling the car compressor only needs to spin at roughly 1700 rpm. Obviously the nice thing about this system is that I can very the rpm of the motor a little to match the heatin/cooling load. The pulley I have for the drive is 6.25" and the pulley on the compressor is 4". That puts my engine rpm at 1100 and I don't think the little z482 will have the power to run it at that rpm but I'll give it a try lol I'll just have to keep an eye out for another pulley for the motor.

Currently working on attaching the pulley I have to the motor. Then I just need to mount everything up and get the belt on. Then some brazing and vac the system down 

I am still working on this. Gotta machine a few parts and then I can start assembling

I️ would get 6 panels and run 3 in series and the two series in parellel. That will get your voltage up since you are using an not charge controller. Although I'm not sure what the max  input voltage is on that charge controller but most are 150v in

There are much better deals out there for solar panels..

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F272901963548

Probably 300$ for shipping.


Other than that your general plan sounds good

JUst gotta order one last part to get the belt stuff together. Then mount it all up to the motor. Then do some plumbing lol

I found a great diy sure and they cover a ton of refrigerant details.. many people have made their own systems and they work well

Ecorenovator.org

The txv is pretty simple and required for any kind of variable capacity system. It has a temp bulb that attaches to the output side of the evaporator to throttle the flow of refrigerant. You just have to size it accordingly to the size of your system. And yes you can run two compressors in parrellel to double capacity. Again if everything is sized correctly.. I have a small solar array already in place and it is nice. Sadly the wife doesn't like to look at them so I'm not sure if I'll be able to get more lol but we shall see

My end goal would be to actually have this system as a ground source heat pump. Both evap and condenser would be bphx with one side running into a ground loop and the other getting pumped into the house with an air to water heat exchanger. Winter time I have crap solar conditions.. lots of big trees and just clouds all the time. So the plan would be to have summer time be solar power and then have the trigger for winter heating.