Cogeneration project

[Christophe]

I found the doc I mentioned above I will put it online tomorrow in full:

[chatelot16]

a car diesel engine is too powerful to make electricity for a single house: it is therefore not necessary to rotate it at 3000 rpm but rather at 1500 t to reduce its useful power and especially reduce the power lost in friction and pressure loss in the valves

[Christophe]

Well I did not say that I agree with this concept: regulation and reliability are the weak points of the use of a car engine (recovery) in cogé. domesticated.

On the other hand it does not cost much and by choosing a large series engine it is easily replaceable ... this is the only advantage of the concept.

[jonule]

Hello,
yes electricity only represents 30% of what can be produced from a running engine, do not neglect the heat for the remaining 70%, coolant (or heating according to name ;-) and pot exhaust.

for rpm, the alternators have a pulley which multiplies by 3 rpm: engine at 2000 rpm the alternator is at 6000 rpm.

[Christophe]

??? Jonule???

[jonule]

yes chris? -)

I actually [quote] chatelot16 ;-)

for reliability it depends on the engines, my XUD is very reliable.
for rpm control you can place a modeling servo motor to control the accelerator cable for example ;-)

for asynchronous generators (saw type engine) it is necessary to regulate the rpm but for synchronous ones (auto alternator type) it is not worth it, the load is regulated according to demand, it is enough to manually increase the idling .

[Woodcutter]

Well I did not say that I agree with this concept: regulation and reliability are the weak points of the use of a car engine (recovery) in cogé. domesticated[...]

For the cruising regime, if we can recover a small TurboD style 205, Corsa, etc.) we can afford to only run it at 2000 or 2200 rpm it's always that won ...

Otherwise, by making a variable speed drive, I think it is quite simple to run a motor at fixed speed.

For reliability, I don't understand your reasoning, Christophe?

[Christophe]

For reliability, I don't understand your reasoning, Christophe?

It is however simple: a car engine is given, roughly currently (specifications) for 5000 hours of life ... taking into account the many constraints (climatic, variable speeds ...) that a car engine undergoes .

At 50 km / h on average, it's 250 km ... reasonable isn't it?

However, an industrial engine has "finished its break-in" after 5000h ... after 10 000h you can "refit" it quite easily, unlike a car engine: I know few people who have changed the connecting rod bearing on a car: economically not (more?) profitable. Well maintained, an industrial engine can exceed 50 hours of operation ...

I would teach you nothing by telling you that at equal power an industrial engine is, at least, 2 times heavier than a car engine ... ditto for the price.

It's not for "nothing" (the large series of car engines may be part of the price difference).

[Woodcutter]

Indeed, I had not seen that at all from this angle ...

And don't you think that by eliminating some of the stresses on an automobile engine, we can hope to double or triple its service life?

Well, that's not how it will catch up with the industrial engine yet, but still ...

For maintanenace, on a stationary engine accessible from below, it immediately becomes much easier to change the connecting rod cousins!

[Lietseu]

the injection pump regulators are all speed regulators on agricultural tractors or old diesel vehicles: when you change the position of the lever or the pedal the engine does everything it can to obey: but for the engines of powerful vehicle it's too brutal: they put mini maxi regulators: it only regulates the mini to not stall and the maxi not to break: between the 2, the pedal controls only the torque without regulating the speed

the mini maxi car regulators are therefore not at all suitable for generator sets

it would be necessary to deregulate them completely so that the minimum and maximum regimes touch, but it is not possible, it is necessary to change the springs ...

Hi, here I am coming (I have read the whole subject, and I am amazed to see that you are still talking about regulating the engine ...)
is it in relation to the load requested? certain engine do it naturally, that of my body adapts to the load so that it allows you to climb a ramp in a parking lot without touching the gas or clutch pedals ... is this so exceptional?

If yes, I know what I do with my box the day when there is no more oil to run, I transform it into a generator!


With greetings from Lietseu