Questions tagged [compressed-gases]
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63 questions
0 votes
2 answers
98 views
Tank structure with highest ratio of max gas mass to tank mass
For context, this is for a concept airship design. It would have a tank of compressed lifting gas and a compressor to regulate the pressure in the main envelope or air sacs without venting it, ...
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1 answer
75 views
Basic Fluid Dynamics Engineering Question
I am reposting this question here, as the Physics section closed my question as not in the correct area, and suggested Engineering..... I have a very basic knowledge of fluid dynamics. I am interested ...
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0 answers
53 views
Cylindrical Stress Vessel Problem
I have a cylindrical pressure tank. There are two bulkheads with interface rings on each side. The interface rings and pressure tank have eight holes that are supposed to align. The bulkheads seal off ...
0 votes
1 answer
97 views
How to pressurize a volume with gas (nitrogen) without a valve to connect to a tank, and to seal it without letting gas out
For reference, I'm currently a CAD engineering student going back to school after working as a designer for a year. I know common sense and how to make drawings, but I don't have much industry ...
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1 vote
0 answers
57 views
Are equivalent lengths different for compressible and incompressible flow?
I've been looking at estimating pressure loss using equivalent lengths of fittings. However, most of the examples and language I've seen seems to indicate this is commonly done for incompressible ...
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0 votes
1 answer
551 views
Finding the right length and strength of gas spring to lift cabinet door
I am building a cabinet that have a swing door that opens upwards. Door size is 2343mm wide x 1198 height x 19mm thick. Door to swing upwards 110 degree from closed position. Door weight is 22kg. ...
1 vote
0 answers
37 views
What are the boundary condition to simulate flow through vent mast?
Dear all, I am currently working on modeling compressible flows that occur when hydrogen needs to be evacuated (for purging, in case of fire, etc.). I am endeavoring to determine the appropriate ...
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0 votes
1 answer
211 views
Explanation of phases of fridge cycle from power draw (power factor, reactive and active power)
I've got this power draw graph of my fridge during a couple of cycles. The power factor axis is on the left, active and reactive power axis in watts/VAr on the right. I'd like to understand the phases ...
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1 vote
2 answers
137 views
What is this hole in some gas related threads
What are those holes for? (Those are for CO2.) Here are a few examples :
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1 vote
1 answer
243 views
Why are double-acting reciproating compressors more efficient than single-acting ones?
On many websites, I read that double-acting reciprocating compressors are more efficient than single-acting compressors. These sources say it's because they complete two compression cycles on each ...
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0 answers
63 views
Can rubber be used as the membrane in a diaphragm compressor with a 1:10 or higher compression ratio?
I've been investing time learning about diaphragm compressors and I can't understand how this particular type of compressor can have a 20:1 compression ratio, and what material could stretch that much ...
user41941
0 votes
0 answers
172 views
How do I purchase cylinders of Hydrogen (H2) gas for person use?
I'm interested in building small model airships, and I would like to purchase a cylinder of H2 gas to fill the envelopes with as is far cheaper and more effective than helium. I've contacted some ...
0 votes
2 answers
309 views
How to calculate the required power to pump out (to vacuum) a container?
Consider I have a cubic container with its volume is 1m cubic as in the simple picture above. It is sealed nicely, it is air proof, no air leaking. I would like to pump out (to vacuum) the container ...
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0 votes
2 answers
625 views
Can a compressor give the same discharge pressure even if suction pressure varies?
The task is to maintain compressor discharge pressure at 200 bars. The inlet pressure varies with time from 200 bars to 10 bars (emptying a compressed air tank and compressing to transfer it to ...
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1 vote
2 answers
137 views
Driving an air cylinder with ignited hydrogen/oxygen gas mixture from fuel cell?
Summary: I need to build a linear actuator that has a very fast actuating speed but fits in a very small space. My Question/Idea: Electric gearmotors, c02, and air pressure, are all ideas that come to ...
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