Questions tagged [gas]
The gas tag has no usage guidance.
100
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Work done during transient filling of a tank
This question stems from the online thermodynamics notes provided by web.mit.edu. I'm having some trouble understanding the example given of air expanding into a vacuum.
Consider the transient, ...
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2
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42
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How do I program a mass flow controller?
I need help to program a gas mass flow controller used to let out a proportionate amount of gas. If I were to pump 3 gases into the controller. I need to be able to let out a specific amount of the ...
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20
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What contributes to the energy cost of multistage compression at high discharge pressures?
I'm getting into hydrogen compression from a theoretical point of view and am looking for a model to describe the energy requirements.
I've gathered, that hydrogen is often compressed with piston ...
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22
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Gas temperature control with a mixing chamber
I am currently trying to figure out how to set up an automatic controller in order to get a precise air temperature at a specific flow rate with a hot and fresh air mix system.
Picture the system like ...
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Applications of CO$_2$ sensors [closed]
I am working on a project where I am creating a new type of CO2 sensor. (I can't give details on the functionalities). I am looking for applications to showcase the capabilities and the usefulness of ...
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Properties of air and gas mixture
While studying a heat exchanger, I have encountered a hydrogen rich fluid stream (enters at 90° Celsius and exits at 120° Celsius) which has composition given in the following form:
Air Humidity/Fluid ...
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Is an air quality Sensor able to detect R-404A/CO2 gas leakage?
I'm planning to use the Sensirion SGP40 or CCS811 placed in proximity of a fridge evaporator in order to detect if there is some leakage of refrigerant gas.
I'm not actually interested to detect the ...
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Can flow rate of a small gas flow be controlled by a valve that is opened and closed rapidly in a certain frequency?
Can flow rate of a small gas flow be controlled by a small solenoid valve that is opened and closed rapidly in a certain frequency?
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2
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Constant Pressure Variable Volume Tanks
Do constant-pressure variable-volume tanks exist in industry? I've read about water-column and membrane-based designs, do either of these exist as OTS components, and where would one get them?
Edit: ...
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0
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23
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Sampling System Line Flow Rate
I'm an application engineer for sampling system products. Currently, one of my customers wants to measure their gas sample composition and create a new sample system to achieve it. They don't have any ...
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15
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How to calculate gas flow in a pipe created by an air jet on its centreline?
I intend to create a gas flow to discharge from a pipe (Pipe 1) by having a smaller pipe (Pipe 2) running through the centre of Pipe 1 and positioned close to the outlet from Pipe 1. I know that a ...
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65
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Calculating gas volume in a gas-liquid system/pressurized vessel
There is water in a tank and the tank is connected to a piece of piping that has a volume of 2.5L.
The headspace above the water is pressurised by using air, to a pressure of 3 bar (a).
What happens ...
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72
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Valves and plumbing size
I'm building a liquid rocket engine and we're using kerosene and oxygen as our propellent. Now my question is what pipe size should we use? My flow rate for kerosene is 0.160 Liters per second and we ...
1
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1
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48
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CFD simulation of an Air and Oxygen gas gradient in a microfluidics device
I am in the process of manufacturing a microfluidic device for use in research, and would like to do a CFD simulation of the interior of the device to see if an oxygen gradient is formed.
The idea is ...
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2
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69
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At what negative pressure do gases separate from water?
According to this video, when a valve is quickly shut, the water hammer effect can lead to a high negative pressure in a pipe downstream. This leads to dissolved gases coming out of solution with the ...
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211
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Gas kitchen stove in skyscrapers
I have watched a property tour around an apartment in the Steinway Tower (NY) on YouTube and I noticed one detail that bugs me, namely gas stoves.
In Poland it is very uncommon for new blocks of flats ...
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27
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How can I measure the flow rate of CO2 gas from two different canisters?
I am looking for some help regarding one topic. I am designing one soda maker and thinking to include a 12g CO2 canister into it as my design only allows that size to incorporate . Now I know ...
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Part to pierce the valve on a 16g CO2 cartridge and connect to a Solenoid valve
The specific part that I’m after is something that can connect to a solenoid valve and a CO2 cartridge that will break the seal on the end of the CO2 cartridge.
The solenoid valve connection is ...
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32
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Are gas distribution networks tree-like?
I was wondering, if it is justified to say, that gas distribution network graphs (primarily in Europe) are typically tree-like. By gas distribution networks I mean municipal and regional distribution ...
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47
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Is there a valve design or system that can do this?
I am trying to come up with a way to bleed air from a tube to avoid air (gas) from reaching the other end of the tube. Is there a way to do this automatically? It must be able to work in all ...
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1
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43
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Can I calculate the amount (mol or mass) of water in a gas, in a heat exchanger, if I know the partial pressure of the water?
Is it possible to calculate the amount of water (mol, mass...) in a gas, in a heat exchanger, if I know the partial pressure of the water? The stream through the tubes is mainly benzene and ...
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2
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67
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What is the purpose of combustor in a gas turbine
I have read online that a gas turbine converts the chemical energy in the fuel gas to mechanical energy of the turbine blades. The way I see it, because of this hot air one would have to go for heat ...
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41
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Should pressure vessel head be thicker than wall [closed]
I wondering should the head of a rectangular pressure vessel cylinder be thicker than the wall ?
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1
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308
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Determining required pressure drop for choked flow conditions to be met
I have pipework system with an inlet pressure, $P_0$, which passes from a pipeline of fixed diameter, $D_0$, through a tee with reducer to a smaller diameter pipe, $D_1$, before returning to another ...
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Is it possible to increase the heat output of a gas stove by connecting two gas supply canisters to it at the same time, and is it safe to do so?
Here's a typical outdoor gas stove:
It is fed by a low-pressure gas supply in the form of a camping cartridge or via an LPG cylinder connected to a low-pressure regulator (around 30mbar) like this ...
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20
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CO2 probe measuring at temperatures up to 150 °C
I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (...
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58
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Does the shape of a car really matter for how much gasoline it drinks?
Let's say that we have a mid-1950s "gas guzzler". Now, we take away the exterior "shell"/chassis and replace it with a modern car's. That is, it will visually look just like a modern car from the ...
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1
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3
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245
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Is there a type of check valve that allows gas to flow in both direction but stops liquid from flowing back?
I have a pressure regulator to maintain a specified pressure in a vessel that also contains a liquid. The regulator can pressurize or relieve pressure of the vessel. I want to prevent the liquid from ...
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2
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1
answer
97
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Do pressurised cans still pose a risk to bursting in normal conditions, but after being exposed to heat?
We're planning on shipping some items from the US to Australia as you cannot get them here, that being:
https://www.chewy.com/sentry-stop-that-noise-pheromone-dog/dp/56486
I have been in contact ...
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1
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75
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Valve/Filter allowing through gas only, no liquid
I need to devise a way to ensure only NG passes through a pipe, and no condensates or other liquids. It is ok to shut down the pipeline if liquids would be detected. The dimensions involved are small ...
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2
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68
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Injecting CO$_2$ into water: how does injection work?
I've been wanting to design my own water carbonation device for a while.
For reference, I've been looking at devices like the Sodastream, which injects pure CO$_2$ into water to dissolve it with up to ...
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26
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What kind of sensors to be used to measure the carbon dioxyde concentration?
I'm planning a thought project for measuring the C02 in a room (at office namely), and communicating its results to a computer.
But I'm blocked at the early stage: which sort of sensor and which is ...
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2
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104
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Ideal gas law, theory vs reality
I am trying to get an idea of the amount of hydrogen that I can store in some pressurized steel tanks underground.
Based on the ideal gas law PV=nRT
I did a simple calculation
pressure = 200bar
...
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2
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Parts needed for controlling vacuum line pressure with pressurized nitrogen
I'm trying to assemble a simple setup where a line which is typically under vacuum can be pressurized by an external nitrogen supply, with this pressure regulated to less than 1 bar absolute (let's ...
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How to contain air ions inside a chamber without loosing their charge?
I would like to create an experiment where I would hold ionized air molecules. Most likely negative O2-1 ions. I am looking for the most appropriate enclosure so that the ions do lose as little of ...
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Calculating mass of gas in container
Given pressure is directly proportional to density, my understanding is that you can use the pressure of gas in a container to calculate the mass of the gas in the container. My reasoning being;
$p=k\...
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Cheapest way to measure gas flow (mass)?
I understand that there are quite a few fairly simple and cheap methods to measure the flow of gas in terms of volume, allowing you to get a flow rate in terms of litres per minute for example.
...
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Modeling Friction-reduced Pressure Drop in Natural Gas Flowing along a Horizontal Cylindrical Trunkline (Pipe)
I am seeking some help related to part of a project I am currently working on, where I require to (data-driven) model the pressure drop due to friction for natural gas flowing along a horizontal ...
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Classic Thermodynamics: Ideal gas question
The question is in the attached picture. I know how to solve the first part of the problem, but the second part confused me a lot.
Now when the oven (system) is unsealed, doesn’t make that an open ...
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2
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0
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55
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Liquid phase gas flow through valve
I have been trying to figure out how to calculate the required dimensions for liquid phase gas through a solenoid valve. Many companies (Swagelok, Bürkert, Asco) provide "Flow coefficient calculators" ...
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41
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Safe, cheap method to dissolve nitrogen in small batches of water (10l)
I am interested in creating a nitrogen infused drink. I want to be able to make small batches of my drink (its not coffee) and testing the market before having to buy expensive equipment.
I think a ...
3
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1
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101
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Would pumping down (below 0 psi) on a gas cylinder regulator cause it to break?
Would pumping down on a gas cylinder regulator cause the needle of the valve to break since it’s trying to go below zero? Would this also cause a problem with the regulator itself?
I’ve included the ...
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Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production ...
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1
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538
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Programming a gas mass flow controller rig
I'm trying to upgrade a multiple gas flow controller, which must be capable of controlling the mass flowrates of three gases independently through one outlet line to our system, and am in need of a ...
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2
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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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77
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Relationship heat rate with capacity
I am an economist, so please keep replies simple ;)
I am searching for the relationship between heat rate and capacity for gas-fired power plants. Here is what I refer to as heat rate, i.e. the ...
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36
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Equation for temperature of gas at Joule-Thompson Inversion State
Assume that a gas obeys the following equation of state:
$\nu = {\frac{RT}{P}}-{\frac{a}{T}} + b$
Where $a , b $ are constant.
Derive an equation for the temperature at the Joule-Thompson ...
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1
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117
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Which type of sensors to analyze polluting gas from vehicle emissions
I am thinking to develop a remote-sensing applications for vehicle pollutions. In such cases generally expensive optical IR and UV devices are used because more precise. These devices are generally ...
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Oxygen sensors in trace gas environments
Do Oxygen lambda sensors (used in automotive applications) work in trace gas environments?
My requirements for a trace Oxygen gas sensor:
The sensor must be capable of working in an inert gas ...
2
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1
answer
923
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What are the differences between compressor stations, pump stations, and booster stations?
I am doing some research on impacts related to natural gas compressor stations. In some states, I've received data for compressor stations alongside other facilities in the oil and gas world. These ...
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