Questions tagged [air]

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What is the most efficient way to heat air?

I'm currently playing with a school project. My goal here is to heat a stream of air to a significant temperature so I can demonstrate air expansion. I have a cylinder, with a few turbines, turning in ...
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2answers
36 views

Will an empty spray can maintain a vacuum?

If I were to remove all the air from a canister of WD40 so that it was a vacuum inside, and reinforced the walls so that it won't collapse in from atmospheric pressure, what would happen when I pull ...
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2answers
31 views

Accurate method or instrument to measure density of shaving cream foam or whipped cream foam?

I am currently filling a "standard" stainless steel cup of known volume with foam and then I weigh it. Then I calculate density. This method is pretty messy and I have to be careful about how I fill ...
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2answers
185 views

Is it possible to create a compressed/freezed air energy storage solution that also purifies the air of pollutants?

Basically can engineers design a machine where , while we are freezing and compressing the air for energy storage, we can also purify it of pollutants?
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1answer
43 views

The physics behind the condensation in tents?

When you compare single wall tent to double wall tent usually you will hear short summary "double wall tent prevents condensation from building up". So in most fair comparison it should work like ...
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1answer
31 views

How does indoor temperature factor in when determining ideal relative humidity in a home?

I am having trouble understanding how indoor temperature plays into what a healthy indoor relative humidity level should be. Most sources I have come across searching the topic online provide a range ...
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1answer
36 views

How can I establish as much airflow from my house to outdoors as possible?

I live in a small flat with all doors and windows sealed. The temperature outside is moderately cold. I assume the temperature in my flat is hotter because my body and the computer are emitting ...
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0answers
28 views

Do companies recover CO2 and water from the purification step of cryogenic air separation, and how?

In the 3rd step of cryogenic air separation, filtered air is purified to remove water, CO2, and hydrocarbons from the N2-O2-Ar stream. Im interested in knowing what happens with that CO2 and water. ...
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38 views

Equation to calculate flow rate

Assume you have a solid walled sphere with an opening of diameter x. The sphere has volume 0.02 litres and has air at 1.4 bars. What general equation would be appropriate to correctly size the ...
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0answers
22 views

Why can't we use air bearings for Hyperloop? Why isn't it feasible?

Why isn't the usage of air bearings for HL feasible?
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33 views

Can I lift 15 tons on air bearings with 0.2 kg air/s?

The air is at 13 kPa and 400 K. I can raise both the supply temperature and the pressure if necessary. No problem with that. I could get 1.7 kg/s for the air bearings, but I have no more air. I ...
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27 views

Is this is a valid estimation for the mass flow required for Hyperloop air-bearings?

In Hyperloop air bearings, the air escapes through the rear cross-sectional area of each ski, you know? Yes, there is a pressure differential, but the air comes out of the skis, crashes into the tube ...
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27 views

Why have some Hyperloop researchers abandoned the air bearings initial idea?

Air bearings are a cheap solution for Hyperloop, unlike the costly magnetic levitation system. I'm consulting some sources and it seems there's enough air in the tube at 100 Pa to feed the air ...
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2answers
56 views

Is there an optical technology able to measure the temperature of dry air?

Optical IR sensors are able to measure the surface temperature of solids. But is there a range of the EM spectrum that can accomplish the same for measuring the temperature of nitrox (dry nitrogen, ...
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1answer
45 views

Why does the water pressure initially drop then stabilize when pressure testing a valve?

Sometimes the dropping goes on so long(10-15 minutes) that the test is thrown out and the valve is opened and filled with water for a longer period of time. Pressure testers claim that it is because ...
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1answer
466 views

How an airlock works?

From wikipedia: Before opening either door, the air pressure of the airlock—the space between the doors—is equalized with that of the environment beyond the next door to open Anyone knows how this ...
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29 views

How can I develope a water loop cooler system sustaining with liquid nitrogen? [closed]

Water will be circulated in the water pipe and liquid nitrogen tanks heat going to cool the water pipe,by the way to the water too. And fan is going to blow this cold air and heat is going to be ...
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2answers
301 views

is it possible to use copper coil instead of pads in air cooler [closed]

The pads are used in air coolers to cool the air but make it more humid. Is it possible to use copper / aluminum coils instead of pads to get cold and dry air?
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3answers
86 views

Ventilation setup high sleeper night cooling

I have a high sleeper in my room (width 3,70m, length 4,50m, height 3,30m) consisting of one large plane (yellow) and one window (darker grey). The plance leaves about 80cm space to sleep. The door (...
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38 views

Relation between airespeed and pushing force

I'd like to know how can I estimate the maximum speed that can be achieved by a "portion of wind" accelerated upward from rest on the surface of a place by pushing forces. So far I've thinking in the ...
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1answer
60 views

What's the longest lasting tubing in air?

What's the longest lasting tubing for use in low pressure air systems? I'm looking at building a greenhouse with double or triple layer ETFE panels and the tubing would be run through the metal pipe ...
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1answer
30 views

How can I determine pressure leakage in a pneumatic system?

I am an engineer currently designing a system in which the leakage of a hose is tested. The system consists of the following components: An air data system used to generate a pressure inside the hose....
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3answers
68 views

How to manufacture parts with complex air channels inside?

I am designing a part that requires multiple air channels with an intricate structure inside. I would like to know if there is any state of the art injection molding technique or other technology that ...