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  • Users: bwilson6561
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  1. bwilson6561

    question on air flow rate

    Thanks. I actually thought about incorporating an regulator to the device. However, my goal is to minimize the cost. This will be mass produced so I wonder what's the cheapest regulator available. Precision or flow rate is not important at all. Something that regulate the pressure(up to 150...
  2. bwilson6561

    question on air flow rate

    If an air tank is filled with 150 psi air. If I want the release the air at a certain rate, say, 20 ml/sec. Is that determined by the size of the orifice? So by varying the size of the orifice with a valve, I can control the air release rate right? If so, can someone tell me the math formula for...
  3. bwilson6561

    air tank question

    For an application, an air tank the size of 1 L or so is needed. It need to hold air up to 150 psi. Are there any manufacturers that make tanks like this? I don't want it to be unnecessarily expensive. For example, I don't need a tank to be rated 3000 psi. Cost is very important and it may be...
  4. bwilson6561

    mini air compressor

    I need a small flow rate of very cold air. Flow rate required is around 0.1 scfm. Temperature of air need to be 80 F below ambient. The thing need to be portable (by a normal human) and not too heavy. It needs to output cold air for at least 5 minute. It has to be air and not any dangerous gas...
  5. bwilson6561

    air tank cost

    What is the manufacturing cost for a 0.75L air tank rated at 150 psi and 3000 psi respectively? (If 5000 of each is to be produced)? Will the 3000 psi tank be a lot more expensive? An approximate ball park guess would be preferred. Thanks
  6. bwilson6561

    mini air compressor

    eliebl, you said, "In compression of a gas the reduction in volume results in and increase in pressure and temperature to maintain the same entropy(I believe). This increase in temperature is quickly dissipated when the compressor is cold as the quantity of heat contained in a gas is small...
  7. bwilson6561

    mini air compressor

    Since compression heat up the air, expansion will cool it. Since diving tanks are filled to 3000 psi, doesn't the air gets really cold when it get released? Shouldn't it cause frostbite to diver? Or does the temperature of the released air actually depend on the rate at which it is released...
  8. bwilson6561

    mini air compressor

    Thanks, what is the mathematical relationship between the temperature rise of air when compressed and other variables such as: final pressure of compressed air, amount of air compressed to that pressure in a given time, etc... I understand when compressing air, work is done to it which increase...
  9. bwilson6561

    mini air compressor

    one thing I forgot to mention is the temperature of the output air. Are there compressors out there that doesn't increase the temperature of the air by much? Thanks
  10. bwilson6561

    mini air compressor

    For an application, a very small air compressor is needed. The compressor need to supply 80 to 100 psi of air at a flow rate of only 0.1 scfm. The correspond to about 1/10 horsepower. Lightweight and compactness is important. Are there air compressors on the market with that small of an output...
  11. bwilson6561

    air flow rate control

    In an application I'm designing, air is vented from a portable air tank. In order to decrease the frequency of refills, it is desired to carry as much air in the tank as possible. This means the tank pressure will be around 80 to 100 psi above atmosphere. But the application only requires a...
  12. bwilson6561

    vortex tube design

    Does anyone know what parameter of a vortex tube determine its output air flow rate? In an application I'm designing, vortex tube is the best candidate but it's an area I have no expertise in. Can anyone recommand to me an engineer that specializes in this area? Thanks
  13. bwilson6561

    vortex tube manufacturing

    It's a very small flow rate application and is to be powered by a portable air tank.
  14. bwilson6561

    vortex tube manufacturing

    I'm trying to achieve 0 F. Is air flow rate directly proportional to the physical size of the vortex tube? I wish I can get a "plan" for a vortex tube that can fulfill my requirement so I can send it to a machine shop and make a prototype. Unfortunately I don't know anything about vortex...
  15. bwilson6561

    vortex tube manufacturing

    Thanks, can they be molded out of plastic? I will buy one and dissect it. In the meantime, do you know what parameter determines the output air flow rate? (for a given PSI of compressed air) I talked to a vortex tube manufacturer and they told me it cost $60 to make a small aluminum one. I...
  16. bwilson6561

    vortex tube manufacturing

    Hello. In one application I'm designing, a vortex tube with a very small air flow rate is required. (Flow rate around 25 cm^3/sec) Commercial vortex tube have flow rate much higher than this. I'm trying to build a prototype and would like to make my own vortex tube. Can anyone give me some...
  17. bwilson6561

    air filter for removing oil

    Unfortunately, the device I'm designing is powered by a small compressed air tank because portability is very important. It's to be used by the general population so it's important that the tank be easily refilled, therefore, gas station is the best solution. Where else can one easily find...
  18. bwilson6561

    air filter for removing oil

    In piston powered air compressors, oil is use for lubrication which contaminate the compressed air somewhat. In the application I'm designing, it is desirable to remove the traces of oil so the compressed air is clean. The pressure of the air will be around 100 PSI What are the different...

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