City water Gravity How is mains water pressurised?
Are pumps used? How far between pumps located along the pipeline? Are gravity fed systems used in any large cities?
Water mains in large municipalities and most suburbs are pressurized by pumps, however there are many areas that still depend on elevated water storage systems to provide sufficient pressure to the system.
In the elevated systems pumps are are still required to fill the storage tanks which are later drawn down as the water is used.
Some areas use a combination of storage tanks and pumped systems.
Distance between pumping stations would depend upon the size and design of the system.
Could piped water produce hydroulic electric power?
we are builting a dam for domestic purposes on the highlands (of 2400m asl) to supply it to lowland (0m asl). the horizontal distance would be 60km at most. for this purpose we are going to use a 250mm diameter pipes, from the dam to the lowland city.
It is just came to mind if the gravity difference could be of any use, as we will have high potential energy. Is there any technology that can change this potential engery (hydroulic) of the piped water into some other form like electical energy that would be used for other small purposes. give me if you have any clue, it is really not a hypothetical quiestion.
thanks Filmon
Anybody hear of the Niagara Falls power station....I think they have been going since 1880, really not long enough for anybody to hear about them.....
generator In Rv RV Generator Won't Start-Nothing Happens?
We recently purchased an RV with a Onan Emerald III GenSet Generator. The previous owner says it started last fall & hasn't been started since. We replaced main(chassis) battery in RV. We press the Start Generator button in RV, nothing happens. Go outside & press Start button directly on RV, nothing happens. And I mean nothing, no click, no hum. Was told if RV has less than 1/4 tank gas, generator will turn over, but won't run & its not even turning over. I read that the generator has a battery of its own & I have no idea if thats true or where it is to try & jump it. Fuse has been checked on generator & it is fine. Any detailed troubleshooting someone can give me would be great!! I'm not very mechanically inclined but not a complete moron either. Thank you!!!
The FUEL PICKUP for the genset is SEPARATE from the one for the motor and does NOT go all the way down in the tank so someone won't run their genset and then run the RV out of fuel for the motor. Try putting some GAS in the thing. Also, I can tell you from personal experience you will have about $500 in that genset before you get it up and running correctly. Have you even CLEANED OUT THE FUEL PUMP? There is a cap on the bottom of it that you turn and take off to CLEAN THE FILTER.. you do know that.. right? What does the MANUAL tell you?.. you DID get an engine manual with the RV.. right?
I've had some fairly dramatic mishaps involving RV's. On one family trip to Alaska, in particular. (Sidenote- have you ever driven to Alaska from the contiguous 48 states? It is a very, very, very long drive.) I was four or five years old; now, you may wonder if I can actually remember what happened back then—I have heard this story countless times, and doubt that I will live it down by the time I go to that glorious RV park in the sky. <br>
I had been doing remarkably well for a four-year old, entertaining myself and not singing John Jacob Jingleheimer Schmidt too many times. I was something of an I Spy prodigy, though, so a few dozen games of that were in order. I believe my Polly Pockets had a lot of action on that trip, too. Well, and then there was always my older brother to answer questions that led to more questions that led to more questions. <br>
One night, after we had pulled into the park, I used the bathroom and (very hygienically) tried to wash my hands. However, the water was out in the park, so nothing happened and I apparently didn't see the need to turn the not-working water off. This would have been fine were it not for a little quirk I'd developed of always putting the plug in the sink when I washed my hands. We left the RV for dinner by the lake, and while we were gone, the water came back on. When we got back, well, there was a lake in our RV. <br>
That night, our towels and the wet/dry vacuum hooked up to our generator all got a workout sopping up and pumping out the gallons upon gallons of water that had accumulated in there. We had a little help though, the water had started pouring out the cracks of the doors, as well. <br>
The next day, with spirits high but slightly damp, we set off again. I went back to use the bathroom again, but when I was done, I forgot to flip the switch that turns the water off. On one of the bumps in the road, a rogue roll of toilet paper fell out of the cabinet and wedged itself between the wall and the lever that lets the water in, so the toilet bowl filled. and filled. and filled. We were all blissfully ignorant up in the front until we started going uphill, and all the water rushed to the very back. <br>
Two for two. Needless to say, I wasn't the favorite member of the family that night. Our still-damp towels were hauled back out, along with the wet/dry vacuum and RV generator. Luckily, as much as you could depend on me to flood the motor home, you could depend on our RV generator to have the power to clean the mess up. <br>
Your home away from home should be just as dependable as your home that's not on wheels, and I know from experience that RV generators are an indispensable part of that. They run on either standard gasoline, diesel or propane, and are rated by their output, anywhere from 1000 to 7000 watts. If you're planning on running an air conditioning unit in your RV, you should have a minimum of 3000 watts. <br>
RV generators aren't only useful in your RV; they're great for campsite, jobsites and your home. Where I'm from, power outages are common, so having at least a small generator at home is a necessity if you want to keep the food in your fridge and freezer from spoiling. Most of them weigh just a little over 100 lbs,, making for easy transportation between locations. <br>
Before you set out on your next big RV trip, there are three things I highly recommend you do. First, instruct all members of the expedition in the intricacies of RV bathrooms. Second, become highly skilled in games such as I Spy or Pretending You're Asleep so Small Children Don't Ask You to Play I Spy Again. Third, and definitely most important, buy an RV generator!
can one use a pto activated device, such as a generator while driving? Or does one have to stop and engage a pto setting outside D and R?
a pto takes the power off the trans when the truck is in P or N if u try and drive with a pto on u will blow up the trans so no u can not
Homemade PTO Generator
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can i get a free ride?
run an auto up to 10mph on a battery or generator then a 24 watt 700 amp alternator kicks in its turned by a pto gear out of the rear axle recharging my battery and running me up as fast as i want to go! okay what if it spins a turbine?
Actually the laws of thermodynamics don't generally apply to batteries, electrical motors, and electrical generators. (At least not in the conventional sense.) To illustrate this point, while the efficiency of an internal combustion engine is on the order of only 35%, largely due to the first law of thermodynamics (think carnot cycle), the efficiency of an electric motor is often greater than 95%, and can be 100% if cooled to the point of superconduction and magnetically levitated to prevent bearing friction.
But the law of conservation of energy (which admittedly is analogous to the first law of thermodynamics) does apply. You can't create energy out of nothing. You can't make a small amount of energy turn into a larger amount.
So your idea won't work.
But let's change your scenario just a bit. When you turn on the alternator (generator), at that same moment turn off the motor. What this will do is brake the car till it stops moving, and recharge the battery as it does so. This is what is done in electric cars today to save energy. But they don't have a separate motor and generator. The motor IS the generator.
This is called regenerative braking.
In practice, if you have excellent bearings and lubrication, and low resistance in your circuits and batteries, and you keep the speed low to minimize wind resistance, and a number of other ifs, you can regain most of your enegy when you apply the "generator brake."
And so, you can't get a free ride, but you certainly can get a cheaper ride.
