dealing with reciprocating air compressors, what does compressoin efficiency mean?
827547
When you say 'compression efficiency' I think you probably mean 'isothermal efficiency'.\n\nWhen air is compressed part of the work input is used in needlessly heating the air. The ideal, but unattainable, minimum work input will occur when compression is isothermal (i.e. when it takes place at constant temperature).  The efficiency of any real compression process is thus measured against this ideal and is called the 'isothermal efficiency'.\n\nIsothermal efficiency = (isothermal work input)/(actual work input)
343214
ACFM means actual cubic feet per minute. SCFM means standard cubic feet per minute.\n\nStandard cubic feet are based on 60 degrees F and 14.7 psia\n\nActual cubic feet are based on the actual conditions in terms of temperature and pressure. \n\nAs an example: If a compressor is taking suction at 20 psia and 100 degrees F. Then the acfm would be calculated and reported based on these conditons. They could also be converted to scfm mathematically.
124703
Compressed air is great if you don't have it you can take a stiff piece of paper with a straight edge and run it between the keys on your keyboard, you'll be amazed at all the gunk that gets dragged up.
428451
1 cubic foot is 28.32 litres\n\nMultiply 2000 by 28.32\n\nMinutes is in the denominator of both units, so no conversion is needed for that aspect.\n\nKeep in mind that if you're working with gases that gases are compressible.
468900
the compressor is used to compress cold air to be used in the cooling process of a/c. you lose very little coolant in the production of a/c.it takes the humidity out of the surrounding air and that is why we see the outside of the a/c drip water. that is the water or humidity that has been taken out of our environment
670360
If you need this information to buy a compressor then other factors need to be taken into consideration over just the PSI.\n  \nDifferent power tools require different pressures, and each power tool has a max PSI that is available to it.  For example most cut-off wheels are not recommened above 90 or 100 psi as they would spin too fast and can cause the cutting wheel to explode when it comes in contact with a material. \n\nThe next thing to consider is the time the device will be used.  For example you would probably not want to use a 1 gal tank to frame a house, as you will wait forever for the pressures to constantly be built back up.  Jitterbug sanders require more volume and will use up a 1 gallon tank in a matter of seconds.\n\nSo heres the best thing.  Get a medium sized compressor maybe 20 gallons, get it with a max PSI of maybe 140, and an adjustable pressure output, and you should be pretty good at taking care of just about whatever you need.  You may have some wait time for pressures to be built up if you are constantly using the tools.  But that also depends a lot on the compressor.\n\nHope this helped some
845128
Bicvcle tyres operate between 40 and 80 psi. But for pumping purposes as long as you can not indent the pumped tyre with your thumb it is hard enough
66108
Nitrogen gas has a property that makes it especially "compressable" if that's a word. In pneumatic applications such as tires or shock absorbers Nitrogen is used because it is "spongier".
530511
Theoretically the two answers above are correct, but the actual watts that the aircons consume depends on the temperature settings and the room itself. The aircon (compressor) will stop working after reaching the desired temp.If the room has many things that generate heat (kitchen equipment, lighting, people), then the aircons may have to work overtime. In this case "maybe" the 2.5 hp actually consume less energy because it can cool the room faster, or have to work only every 5 minutes.
1094449
The air temperature within the casing being higher than the shaft bearings is a result of compression of the air in addition to the heat generated by turbulence. You are also paying for the energy to heat this air, hence the more efficient the blower, the cheaper it is to run.\n\nYou don't mention what type of blower you are using. Assuming you are using a 'squirrel cage' type blower, some turbulence, with it's associated noise and heat, can be eliminated by adjusting the gap between the squirrel cage and the entrance to the blower's discharge opening. The smaller this gap, the more air is discharged, instead of tumbling back into the blower housing.\n\nI  have had luck with some books written by Dave Gingery, primarily the one titled "How to design and build centrifugal fans". I've listed the website below. \n\nHope this helps\n\nOuzinki
95239
compressing 2 liters of water into a 1 liter volume\n\nLiquids are not compressible.
659681
One of the other responses is correct in one sense that the ultimate efficiency of an internal combustion engine is determined by its compression ratio and operating temperature.  However, those things being equal, the engine with the lower amount of rotating mass will produce more output power per unit of fuel.  As one of the responses mentioned, lighter pistons can affect the efficiency, as can the design, e.g., a roller cam, overhead cam designs vs. rocker arms, a shorter stroke (sometimes), can all affect the comparative efficiency.  One glaring example of how rotating mass and internal friction can affect such is that better oils can improve fuel efficiency by reducing internal friction and lighter pistons can as well by reducing the amount of internal poser usage to accelerate and decelerate the pistons as they travel.
474309
to reduce air pressure sudden surge
839893
"turbo" used in normal piston driven engines uses the exhaust gasses energy to drive a (typically) radial turbine that is connected to a compressor that compresses the intake air. \n\nThe increased amount of air (mainly the oxigen in interesting) allows to add more fule to the mix and create a larger explosion in the cilinder yielding more power.\n\nThe air can optionally be cooled using an "intercooler" (air-to-air heat exchanger)\n\nFor diesel powered engines the result is an increase in power of the engine and an improvement of the fuel economy. For gasoline powered engines the results are an increased power, but the fuel economy might go either way.
951860
It's difficult to explain without diagrams.\n\nFirst you have an air supply at about 20 psi that flows through a restrictor and a small nozzle the same size as the restrictor. There is a flapper, a small piece of metal that covers the nozzle and controls the backpressure between the nozzle and the restrictor. The pressure between the restrictor and the nozzle is controlled between 20 and 100KPa (3 to 15psi) by the position of the flapper. The position of the flapper is controlled by the input current (usuall y 4 to 20mA of 1 to 5V). Thus the input signal varies the pressure out. I havent seen any links but I will look
361464
the principle is by compressing a coolant, and injecting this coolant into a small pipe, the size will minimize heat built up, as the coolant moves around the pipe or coil, air is blow into this coil which result into cooler air.\n\nThe coolant is then compress back to repeat the process.
526702
The only way to know is to try it! Get one of those 12V compressors for inflating car tyres and connect to the bottle with a pressure gauge that reads +200psi. Cover the bottle with some sort of containment device like a laundry basket leaving the guage exposed so you can read it with a pair of binoculars. Turn on the pump and stand well back..!