Questions tagged [compressed-air]
The compressed-air tag has no usage guidance.
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What happens when throttling in an isothermal process
Consider an isothermal expansion of an ideal gas (always at ambient temperature $T_0$), from some initial pressure $p_i$ to the ambient pressure $p_0$, such that the maximum work available is:
$W = ...
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22 views
How to balance flow and pressure in nitrogen purged chambers?
I have an instrument that is technically a humidity controlled chamber. It measures how much moisture is picked up by the sample through a microbalance(Zone 1). Nitrogen gas flows from zone 3 and ...
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25 views
Calculating flow: Pressure vs Blower
I was modeling an air system using compressible fluids modeling software and seem to be overlooking a fundamental hydraulics concept but I can’t figure out what it is.
I can model the blowers as ...
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5 views
Convert Blower Curves - ACFM to SCFM
Is there a way to calculate the effect of temperature on blower discharge pressure when trying to convert a blower curve at one set of conditions to a standard set of condutions and Vice versa?
When ...
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10 views
Getting from ICFM to ACFM - What filter loss to assume
Is there a reasonable, documented assumption of pressure loss that can be assumed across the intake filter for a centrifugal blower system? I have heard .15 psi (or approximately 4 in w.g.) but that ...
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2answers
176 views
What's the difference between a vacuum regulator and pressure regulator?
When browsing through pneumatic parts, I notice that some vendors specify different components for pressure regulator and vacuum regulators. SMC for example does this.
I'm curious why vendors would ...
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1answer
152 views
How do you interpret a pneumatic regulator symbol?
I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used.
I've come across two different regulator symbols (or so I believe them to be regulator ...
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2answers
63 views
How do you read a blower/compressor curve with multi-curves for inlet guide vanes?
I am trying to apply an existing blower curve in a hydraulic model for a single stage blower with variable inlet diffuser vanes. The variety of curves shown on the plot does not seem to make sense to ...
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2answers
2k views
Define Free Air Delivery for an air compressor
Free Air Delivery (FAD) is a common measure of the capacity of an air compressor. I have a question that comes at the end here. My question is a little different from what you might be expecting. So ...
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1answer
97 views
How to calculate added lift from ground effect
I'm trying to build a hovercraft of sorts, and I thought I'd take advantage of the ground effect. I've done some searches, but I can't seem to find any guides on the actual physics. How do I go about ...
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53 views
Simplifying head loss across a piping network
I am tasked with designing a compressed air piping network,with and would like to determine the pressure loss across the different layers of instruments
-now here is the 3D layout of the network. ...
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1answer
48 views
Recommended compressed air source and location for separate air compression system
I am investigating what would be the most appropriate compressed air source (fan/blower/compressor) for designing a separate air compressor system.
The information is as follows:
the compressed air ...
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2answers
38 views
How deep would a water bottle have to be submerged in the sea to burst? [closed]
Assume the water bottle is the most sturdily built standard water bottle one could acquire in an american supermarket.
This is the first question I've asked, so I'm sorry if I'm not in the right ...
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20 views
Calculate output force from air compressor through restricted piping
I have an air compressor (this one) which is rated to output 3.00 CFM at 40 PSI and 2.20 CFM at 90 PSI. It's connected to a pressure regulator which drops the pressure to 5 PSI. Finally, I have a ...
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3answers
113 views
What is the best method to generate heat from a compressed air canister?
I want to convert the pressured air exiting a valve to heat. I know that a vortex tube can be used to do this, but I am wondering if I need to make modifications to the vortex tube to make it more ...
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Compressors - Pneumatic machines
I'm struggling to check if an air compressor is appropriate to provide air to a group of pneumatic machines.
The compressor gives an air flow at a given pressure, so what I did was to use catalogues ...
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1answer
57 views
How to power and transport air to a small hover car track [closed]
I'm trying to design a hover car track. As in, you have a 'track/circuit' that have objects being slowly moved along by the force of the air from beneath and sides. The propulsion to move the objects ...
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36 views
What would axial air compressors design look like if static flow straighteners were prohibited?
This may be a strange question, but I wonder about the behavior threshold between axial and centrifugal compressors. Are there some attempts at merging the two concepts?
I'm thinking of something ...
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1answer
37 views
What is this “johnson controls” device on the wall in airport?
I was passing column in waiting area of Pearson airport when my sweater cought some kind of device on the wall. Device was without cover and looks like old thermostat. When my sweater caught it, it ...
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2answers
76 views
Compressed air energy storage?
I'm wondering, if you put an air compressor pipe into a micro turbine, lets say something like that attached to a motor, does air that get out of the turbine have the same energy as when it gets in ?
...
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1answer
59 views
can we run rotary compressor of Air conditioner with different frequency level?
I am working on split type AC compressor. I actually want to know, if i changed the frequency of the compressor to run on different power level, will it affect the life of the compressor. My actual ...
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1answer
40 views
Drying a air-tight container
What method should i use in order to remove moisture from air of a container completely? Should i flush it with N2 or argon (its air-tight) or is there a device that i could use to remove moisture ...
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1answer
26 views
Compression and check valves
Pressure pumps are used to apply pressure to a system. What would happen if someone attempted to fill, for example, a bicycle tire (with a check valve) to 2 ATM of pressure using a pressure pump that ...
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2answers
89 views
What is a good non-combustible oil to be used in air compression regenerative braking/energy storage system for cars, buses, and trucks?
An important energy storage method that is being given very little consideration is gas compression. The kinetic energy of the vehicle can drive an air pump or compressor that would compress air into ...
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4answers
101 views
Tubing for explosive gas or hydrogen transfer
Recently, I heard that there is a law/ OSHA/ ASME piece of regulation dictating that hydrogen should be transferred (suppose from a tank of hydrogen to another location) by using specially approved ...
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1answer
555 views
compare l/min output of CO2 pressure reducer to bar (compressed air)
I have a pressure reducer calibrated for Argon and CO$_2$ output. If I connected it to a gas tank with compressed air, how can I convert the output information "liters of Argon / CO$_2$ per minute" to ...
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1answer
172 views
volume comparison of compressed air and gas duster
I'm currently using 400ml Dust Off 67 gas dusters and want to replace them with compressed air and a blow-out gun.
In order to select the right equipment and get a better understanding I would like ...
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4answers
122 views
What type of air blower/compressor to use?
I need a way to move air which is somewhere in between a compressor and a fan: something along the lines of 20-40 cfm at 2-3 psi (500-1000 liters/minute at 10-20 kPa).
Typical small compressors (of ...
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2answers
128 views
Check valve in compressed air pipe network?
I am working on a building that would like to used compressed air for some pneumatic actuators. They would like to bring the air in from an adjacent building that has more than enough capacity, but ...
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0answers
2k views
rough estimate for energy stored in compressed air tank
I'm trying to figure out a rough approximation of how much energy in joules is stored in a compressed air tank with parameters of gallons and PSI. I think I've discovered that the exact formula is a ...
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1answer
1k views
Why was Freon used in spray cans before it was declared a threat to ozone?
I've heard that in the past, spray cans (aerosol cans) contained Freon. I found that the Montreal Protocol made the usage of Freon illegal due to its effect on the ozone layer, but I can't find the ...
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1answer
55 views
pneumatic solenoid operation?
Any idea on how this type of pneumatic solenoid works? I know that NC is normally closed, NO normally open, but not sure how air flows? Thanks!
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1answer
37 views
Are “Imperial Eastman” compression connections sized the same as regular imperial connections?
I have some high pressure and vacuum lines off of a tool from the 1980s and they are labeled as, for example, "3/8 imperial - eastman," which seems to be different from how normal compression ...
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2answers
20k views
How does loading and unloading work in an air compressor?
I am looking at an ammonia refrigeration unit and trying to understand how loading and unloading solenoid valves work? and also how to modulate the compressor motor over a period of time.
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1answer
82 views
How do you actually control the cooling level of AC?
I'm hoping this is a relatively simple question to answer, but I just couldn't find it on Google.
With regard to air conditioning (or any cooling system that relies on compressing/evaporating), how ...
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0answers
389 views
Estimating Maximum Speed for a Pneumatic Cylinder
I am designing an machine that is going to use a pneumatic cylinder to accelerate a projectile. I have a tentative cylinder specified, and am working on the control and supply side. I have verified ...
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2answers
1k views
Compressed air as thrust? [closed]
I was watching a video recently about aircraft carriers and how they use compressed air to propel aircraft off the ship. It go me thinking if I had, maybe a 50x50x50 cm spacecraft that was put ...
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1answer
3k views
Basic difference between “compress” and “pressurise”
We call air which is pressurised as "compressed air". But we don't call pressurised liquid as compressed. I know that liquids are incompressible.
So,
why particular word "compressed" is the created, ...
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2answers
140 views
Using compression screw as air engine
Can a screw such as the one below be used as an air engine in pressure range between 700 kPa and 2500 kPa
on other words Can I reverse compression process with a screw to work as air engine
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1answer
169 views
Air tool to compressor backflow
As I was reorganizing my air tool arsenal, a theoretical question popped in my mind I'd like to know the answer to. In designing air flow between an air compressor and a tool (such as a nailer or an ...
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2answers
359 views
Turning an engine over with engine compression
When you compress a bicycle pump and seal the opening, the pump will automatically return to it's initial position when you release it. I suppose this is how air suspension works as well?
if you have ...
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2answers
286 views
Pneumatic Actuators - System Reversibility. Is it possible to use an actuator to store energy?
I'm very much new to pneumatics and I was wondering if there was such a thing as a reversible pneumatic actuator?
I'm designing a system that has to be lightweight, pneumatic and use a mechanical ...
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2answers
1k views
Air compressor that doubles as a pneumatic motor?
I am working on a compressed air energy storage system. The size and weight of the system are heavily constrained; nothing should (ideally) exceed a few pounds. For this reason, I would like to store ...
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2answers
1k views
Why does public transport uses compressed air to open doors instead of electromotors?
System with compressed air seems more expensive and harder to build and integrate neither using simple electromagnetic drives to open public transport doors.
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1answer
318 views
Are there any precedent designs for a mechanically-delayed pressure release valve?
I need to release pressure of around 50psi, after 3-4 seconds of initiating, from a vessel using a mechanical switch. I had considered a pneumatic solenoid, but I want to forgo the inconvenience of ...
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2answers
266 views
How to design a hemispheric flexible pressure vessel?
Consider a balloon, it is a flexible, expanding pressure vessel made of synthetic rubber. I am trying to design a system that will use hemispheric pockets of neoprene to grip an object, much like the ...
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1answer
948 views
Tankless air compressor for electronics desoldering station
I purchased a Weller WSD161V soldering station (similar to this one, at least with regards to the pneumatic system I'm about to describe -- sorry, I was unable to find a manual for my specific model ...
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5answers
6k views
Is compressed air energy storage economically viable in the home?
If I install a small air compressor/engine, generator, and tank in my garage, and I charge it up at night when electricity costs $\frac{5.4p}{kWh}$ and use it during the day to power my house when ...
