Q:I know I take for granted that I have indoor plumbing but where does the water pressure that causes water to flow come from when I turn on my sink? Is it a pump. Where does the energy come from?

The water drains out of the sink because it is a downhill flow from the sink to the sewerage outlet. The actual pressure is due to the height of the water and gravity. This can be stated as a head, in meters. Similarly the water comes out of a tap because it has a downhill flow from the supply reservoir typically. This can be a tank on a hill, or a tower. The water is transferred to the reservoir from its source like a lake by a pump, which gets it uphill to the reservoir. The pump is usually an electric one, though a diesel generator could be used as backup, or even a diesel driven pump could be used. Electricity is cheaper to run, considering the energy involved can be costly. The static pressure comes from the height of the reservoir above the tap outlet. This is also seen as a head. The typical pressure is 40 to 80 psi (equivalent to 30 to 60m of head or water column). Once the water is flowing at full bore the pressure drops, due to the pipe resistance and such effects, typically represented as 10-20psi approx. 8 to 16m of head. This is the pressure before the water leaves the tap (faucet), and is enough to flow through some device like a shower. At a remote property a tank stand may be used to get some height, or a pressure pump, which is equivalent. With a pressure pump the water is pumped into a rubber bladder like a large football bladder, so it can be squeezed out on demand. The pump runs cyclically as required to keep sufficient pressure in the bladder. This arrangement is known as an accumulator. High buildings may have related accumulators or a reservoir on top, and a pump/s to get water up there.

Q:I have been researching EV cars and conversions and am wondering about using a generator instead of batteries. I am not an enviro-nut concerned about making an emission free vehicle, just one that is cheap to drive. It seems to me that using a generator to power the motor, although it would use gas, would be way more efficient than a normal gas engine that is in a car, and would be lighter than batteries. Also, if it is a diesel generator I could run bio-diesel to cut back on emissions. Am I correct in this assumption?

I was working for werner trucking and they were installing APU generators on thier trucks and it uses 1/3 less than the truck does at idle. 1/3 of a half a gallon of fuel an hour. It runs the ac and heat. I hope this helps

Q:I have a 4 piston Diesel engine on my generator, I have a nasty oil sludge continue to build up every time, I have flushed the engine with engine flush liqui-moly probably six times, but after it is clean the sludge builds up again in couple of days, I got sick and tired of going down there and get all messed up with nasty oil.The engine produces while smoke continuously, not much but visible enough. I get oil coming onto the air filter, the place smells nasty because of this. The light bulbs flicker when running on the generator, it heats up fast and shuts off when I put load on it as an AC. Can someone please help me out and let me know what to do?

The sludge is an indication of coolant leaking into the oil, as is the white smoke and the fact its over heating, This is due to either a cracked water jacket or sleeve or cylinder head and or gasket, As to what to do? Have it properly diagnosed by a qualified mechanic and if need be rebuild the engine or replace it. As replacing the cylinder sleeves at a reputable shop can cost as much as a new engine.

Q:I'm estimating 81 mpg at best, and 47 mpg at worst.

Probably - with serious optimization - about the same as from gasoline/electric hybrids, maybe a little worse. Most people are as surprised as I was to find out the maximum theoretical efficiency of a diesel engine is about 50% while the maximum theoretical efficiency of a gasoline (otto cycle) engine is about 65%. It has to do with the diesel adding heat at constant pressure while the otto cycle engine adds heat at constant volume. Anyway, gasoline engines typically fall behind because the theoretical maxima are at infinite compression ratio with perfectly insulated cylinder heads, cylinders, and pistons. Diesel engines are capable of much higher compression ratios than gasoline engines, and the method of throttling gasoline engines has the effect of reducing the compression ratio even more. That has given diesel engines a reputation for efficiency and they are more efficient than turbine engines (about 40% max) and rockets (about 12% max). However, hybridization has allowed gasoline engines to reach efficiencies that are not very practical for diesels. The current generation Prius spends a lot of engine operation at 38% efficiency - the 2016+ is supposed to reach 40%. Diesels can't compete; although that represents only 61% of the theoretical max for gas engines it is 80% of the theoretical max for diesels, and that last bit of efficiency is the very devil to achieve. It would require entirely new materials and other major improvements. As the source says, Conventional gasoline engines have long run about 25 percent, diesels at 30 to 35 percent.

Q:Dikantor saya ada genset dgn specs sbb : Cummins Diesel Generator Tingkat daya: 175KVATegangan: 230/400v (110-760v)Frekuensi: 50 (60Hz) Jenis: 6CTA8.3-G2Daya (Kw) 163Trus bagaimana cara perhitungan pemakaian solar nya ?? Dalam 1 liter solar bisa di pakai brp jam ?

Jam KLKDYS

Q:I have a 1992 Toyota Tercel that sits in my yard. It ran at one time, but has been driven so little that it now no longer starts. Had this problem one time before and paid someone to fix it. They replace the fuel pump to get it started again. Other issues are lost title, back left tire seems locked, and busted windshield.I hate to just trash this car and wonder how difficult would it be to turn the motor into a backup power generator for my house? Is it feasible? One of our sister companies at work has a diesel engine that acts as a backup power for their computer room, so I wondered if I could possible do the same for my home.Any suggestions?

as Mark said anything is doable in exchange of some work! if it is economical, the answer is no as for the speed control you need a cruise control modify-it to keep the frequency constant as an example a Chevy truck 350 in? is 200HP as a vehicle and 40 HP as a stationary engine! there are lots to modify such as cooling, lubrication to be compatible with new venture from an academic point of view it is worthwhile because you will learn a lot about engineering, and this is priceless information good luck Di

Q:I have 1500 kw load,i want install on Diesel Generator.What should be rating?

If its a pure resistive load consider the efficiency of the alternator, de-rating factors to ambient conditions etc. etc. After considering all of the above you need a 1650KVA (with 10% safety factor

Q:I have to wonder. WHY don't we have a car right now in 2010 that gets 100+ mpg?Ok we have the Honda Insight and Toyota Prius that get 50MPG+ WELL why not DOUBLE or TRIPLE or QUADRUPLE the Batteries and get 100MPG??? Seriously WHY NOT PACK Enough Lithium Ion batteries in there to get 300MPG?? You mean to tell me that with all the technology we have today in 2010 that we can't come up with a Hybrid that gets 100MPG??? PURE NonsenseSomeone somewhere is keeping the 100MPG car from being produced. Simple as that. You mean to tell me that you can't pack enough Lithium Ion batteries into a CAR to get 100MPG??? Yea right. You know it could be done. BIG OIL and other political forces DON'T WANT the 100MPG car. Why did gas prices go to $4.50 per gallon??? TO get the $$$ While the Getting was good. Now the gig is up and they know it.

Lithium ion batteries are a good source of energy storage, but they have some very serious drawbacks: If they are shorted they can go into melt-down and start a fire, and that's the small ones the size of a quarter. Think what could happen after a car wreck - You could start a block leveling fire. There will have to be a better battery design before the electric car becomes viable.

Q:i read alot, maybe them all, but i cant understand how yachts work or get their power from. Please help !!

Most non-sailboat yachts longer than 40 feet (and up to 300 feet or more) are diesel powered using one or several large Caterpillar, Man, John Deere, Detroit or other similar large diesel engines. A yacht shorter than 40 feet is often gasoline powered. None are battery powered. All large yachts have diesel generators which are used to generate electric power for the onboard electrical systems. When a yacht is docked it usually obtains power from the shore using a large cable that connects to shore power supply systems. Yachts with sails usually also have a single small diesel engine that allows them to maneuver in harbors and other places where sailing might be dangerous or impossible.

Q:fuel oil operated generator (called also heavy oil) can be a dual fuel engine e.g. fuel oil w diesel backup.engine only or a generator set.generator 150~250 Kvaif engine only: 200~300 HPused in working condition

What the heck is the question?!