How to figure the ELECTRICAL ENGERY COST of running your Air Compressor. Convert the minutes into seconds and then total the number of seconds it takes between START and STOP/UNLOAD. Note the significant difference between the quantity of work you can get out of a given volume of stored compressed air depending on whether the expansion is adiabatic or isothermal (i.e. A. The WALTHER ROTEX RM8 – English style, but made in Germany. Later, the original poster (OP) further explained that he was calculating how much compressed air was needed to accelerate a human body to a certain velocity. Receiver - A vessel or tank used for storage of gas under pressure. In some special - but realistic - cases graphs exist. If increased volume of air stored is equivalent to increased potential energy, this website, while not scientific, makes me think the relationship is linear: http://www.spearfish...java/tankv.html. That relationship (pressure to potential energy) is much too complicated to depict on one graph as many variables are involved. ", Gauge Pressure - The pressure determined by most instruments and gauges, usually expressed in psig. This repeating compressed air rifle for hunting and recreation is available in 4.5 or 5.5 mm versions and with a muzzle energy of up to 30 joules. I would expect the capacity to be cubic feet or meters, etc. How would one calculate the potential energy content of compressed air at 25 degrees C (~room temperature) for a range of volumes and pressures? Then, at moderate gas density, the enthalpy (H) depends just on the gas' temperature (T), so diagrams exist, as simple as H versus T. Or rather, H versus T at many different pressures - but this isn't very useful because pressure changes when the gas is exploited. You have an 80 gallon tank, your total start to stop/unload time was 3 minutes and 9 seconds. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. CLOSE the outlet valve on the tank/air receiver E. The specification "30 gallon tank" doesn't seem very meaningful when talking about compressed air. Then START THE UNIT. Types of Energy: kinetic and potential Energy Kinetic energy - energy of a moving object KE=1/2mv2 Potential Energy – Energy stored in a system, for example an object of mass m, a distance h above the surface of the earth has a potential energy given by mgh. Example: 25 HP air compressor that runs 10 hours a day 5 days a week for a year with a $.12 KWH electric rate and a 90% … Apologies, correction to the above – but still very strange: That's assuming that the man is the piston. Use this formula for electrical energy calculation: Electrical cost = Total HP x .746 x hours x KWH cost ÷ motor efficiency. http://virtualpipeline.spaces.msn.com. Most books and courses begin with the general case and give gas as a special situation - then it's very abstract and offputting. Cycling dryers (also known as thermal mass dryers) utilize a … Then the maximum work can be computed with a limited effort. In fact, any compressed air cylinder would be fine for this, but I wanted to provide one to save time. More commonly, you get diagrams at constant entropy. I have designed an ejecting system using a fabric/rubber sack as a mass less piston. This is not a factory site. In more complicated cases you need experimental tables. Motor Data Plate HP (EX: 25HP) X 110% =. It comes with an 8-shot metal rotary magazine. B. Was not sure if here or chemistry would be better. TANK GALLONS x .538* x PSIG divided by SECONDS In a large compressed air system there may be primary and secondary receivers. To figure your total horsepower (TOTAL HP): At the pressure you cite, and reasonable temperatures, air is nearly a perfect gas with gamma~1.4, and then its enthalpy is 3.5 * R * T (K) in Joules per mole of 29g, or nearly 1kJ/kg/K. When expanding a gas, it colds down. F more. You now know that your air compressor is delivering 39.71 CFM. Load Time - Time period from when a compressor loads until it unloads. i hope this response does not violate any forum rules.... if it does, my apoplogies and please trash it. 7. Sign up for a new account in our community. It was only an example. email@example.com. With this extra information on what the OP was doing, it became possible to progress and … For those who like a little more power: The new Walther MaximaThor repeating compressed air rifle does justice to its name. 1. Click Here to join Eng-Tips and talk with other members! If you can do the ideal, reversible expansion under isothermal conditions, you can get a great deal more work out of a given stored volume of gas than if you do it adiabatically. The original post asked only about the potential energy content of compressed air, which your available energy equation answered very nicely. 4. Cubic Feet Per Minute (cfm) - Volumetric air flow rate. Subscribe Today to receive Compressed Air Answers & Tips - valuable free information for folks who work with compressed air systems. Thanks for offering such a nice resource. It's easy! Login. Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. A & B. I'll need to chew on that awhile. Double the pressure less than doubles the maximum available work, unless the pressure increase over 1 atm is very small. Use as a reference for answers a typical construction site air compressor (30 gallon tank/cylinder; capable of 19 cfm at 125 psi; http://www.constructionequipment.com/jenny-j5a-30p-air-compressor.). This mass converts into a volume of air taken at normal atmospheric conditions. At the pressure you cite, and reasonable temperatures, air is nearly a perfect gas with gamma~1.4, and then its enthalpy is 3.5 * R * T (K) in Joules per mole of 29g, or nearly 1kJ/kg/K. g is the acceleration due to gravity = 9.8 m/s2 More examples of potential energy Another example is a spring, compressed a distance x from its … Thank you very much for your detailed reply. Interestingly, enthalpy is defined from the liquid's state, and suffices to compute the available work, but the work comes from an energy stored in part elsewhere, here it was fully in the gas. If the person isn't the piston, then you need to put more mass in the equation, since the air must accelerate the piston as well. Compressed air temperatures in excess of 38 °C (100 °F) are very common in Southern climates, mining operations, steel mills, shipboard, etc. 746 watts per hour of electrical energy is required to convert to 1 Horsepower of mechanical energy. The boltaction feeds the pellet directly into the barrel, resulting in precise long-distance shooting with minimal velocity reduction. In practice, when someone gives a pressure in just "psi" they probably mean gage pressure. The work you can extract depends on if you let it cold down naturally, or inject heat in it so, for instance, its temperature keeps constant - or any other situation.
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