Cfm Definition and 62 Threads

A while back, you guys helped me out with a project on my '69 Camaro. It was all about the Bernoulli principle and airflow taking the path of least resistance. I'm happy to say that the lower closeout panel I built (see pix below) seems to have done the trick as the car I no longer having any...

I was told if I need 60 CFM at each opening multiply the mount of openings by the 60 and that would be the minimum of CFM inline fan I need. so 7 x 60 420 CFM but I need to figure if I reduce the pipe at the fan and how many feet it is running , if that has an effect?

Hi airfoil experts, I brought two high speed fan for magnetron cooling, and upon destroying one due to my mishandling of the stuff, I found out these fan have surprising nice airfoil. See the pictures and you will understand their construction. The rotor part looks just like a normal air flow...

I am designing a dust collection system for a powder mixing project. My current setup is basically a tent (roughly 6ft X 4ft X 7ft) with a dust collector tube hanging from the ceiling (or coming from the floor). I know the CFM, air properties, and pipe area at the end of the dust collector...

I have a compressed air system powered by a 25 HP reciprocating compressor giving 109 CFM @ 175 psi. This system also provides air through a ball valve off the main system for vibrators totalling 186 cfm @ 80 psi. Where does all this cfm come from that powers the vibrators when the pressure is...

So my boss hook me up with the Compressed Air Calculations which we never did previously at our workplace. So started researching about the subject and designed a Compressed air system. The only thing i am not sure about now here is the relation between CFM vs SCFM vs Pressure. Let us take an...

Halfway through my thesis on a mach 2 ramjet, and I unfortunately realize that I need 50-72 CFM to test it. The only ACs I have are 2 CFM portable pancakes. Is it possible to run say a 25 CFM AC at 50 CFM for a short period of 10-60 seconds? Is there a quantitative way to find how long the AC...

Hey guys building an air cannon for class that shoots a wad of paper from a normal sheet of 8.5/11 paper will be dry. Question is... Is Psi more important or CFM with this light weight projectile? Plan on building from PVC, can do 100psi easy. Plan on using a diaphragm valve with a solenoid for...

I have a large hydrogen storage tank that vents when the pressure exceeds 150 PSI. I am trying to get a rough calculation of how much hydrogen we are losing. I know it is a 2 inch pipe and the pressure drops from 150 PSI to 120PSI. The venting lasts between 2 and 5 minutes. How do I...

Hello, I'm new here so be gentle. I have a fan that produces 400CFM. I am attaching the fan to a 4 inch pipe in an effort to move a 2lb object down a near frictionless track. I'm having trouble figuring out CFM to the pressure/force that will act on the object. The object is approximately 2in X...

Sorry if this is the wrong forum to ask. I have a fine spray application where I need ~140 psi but only .3CFM. I'm trying not to buy a regular air compressor (money wasted on unneeded CFM) and am looking at tire inflators, but very few of them have CFM ratings. Any suggestions?

And does it matter if you are going from 200F to 100F or 500F to 400F? ie, is it temperature dependent?Thanks

Hey all, I’ve scoured the internet in search of an answer to no avail, so it’s time to ask the experts!My background is more Chemistry and Biology, not Physics, or specifically fluid dynamics, so bear with me! Also, this is a little long, so I will do my best to make it easy to follow.The...

On what does the cfm of fan depend ? how to gain maximum cfm from a 1800 rpm fan ?

Hi, Looking at blower fan charts, why does the static pressure drop with increased CFM, what makes sense to me should be a pressure difference rise with increasing CFM.

I am working on plans for a portable air motor system, to power a scooter discretely. The motor I have picked out is a Gast 1UP-NRV-15, which is a vane-style oil-less motor, with the following specifications: 6000RPM (628 radians/second) Max torque 0.68 Newton-meters @ 1000RPM (6 in.-lbs) 373...

I work for a manufacturing company. We want to make some improvements to our compressed air system, but we want to establish a baseline of our current efficiency for cost justifications, etc. One planned improvement, is redesigning our current piping layout. We spoke with a consultant who wants...

I know how to select a heat sink based on Power dissipation and max junction temp. But how do I relate this to CFM of a fan. How I calculate CFM based on pd and max junction temp?

I have an anemometer that I bought that does not have the ability to put in the ID of the orifice I am trying to measure. In this case it is a 4.5 inch orifice-stays the same for me 95 percent of the time. Does anyone know how I convert the reading manually so that I can get an accurate...

how to convert 0.6 mpa to cfm

Respected Gentelmens please advice regarding to my queries. What would be required range of cfm of air compressor to lift a weight about 100 kg. and advice regarding small but effective air compressor available.

Hello, Here are the known's of a chassis: Inlet open area = 17 inches^2 Outlet open area = 30 inches^2 Internal Fans = 270 cfm (3 fans @ 90 cfm each) What is the CFM through the system and what's the equations used to figure this out? I assume that if we had a very small inlet or...

Hello, Here are the knowns: Inlet open area = 17 inches^2 Outlet open area = 30 inches^2 Internal Fans = 270 cfm (3 fans @ 90 cfm each) What is the CFM through the system and what's the equations used to figure this out? Thanks a ton! John

Say I have a 10 gallon air tank, how would I figure out the CFM potential for the given volume? Also, what is the volume difference between a 10 gallon tank and 10 lbs. tank?

Ok here is my problem. We have a static value that we use for determining the cost of air based on the pipe size and the CFM used. What I have is the size of the pipe openings and what my constant static pressure is. The air is being blown into a vacuum. System details: Lead pipes is 4...

dears; happy new year... I would like to ask you about how can I calculate the blower flow in CFM. what are the required data that must be available. Also I need the equation that calculate the flow.

How can I calculate the power needed to compress air to a given pressure and CFM? I need to select an electric motor that is capable of compressing air to 2 PSI at 520 CFM. I would appreciate the formula(s), not just an answer to this pressure/volume, as I will probably be playing around...

Hi, First time user here. I was hoping someone could help me calculate the CFM of air needed for an Air Compressor to air-clean 16 tubes. The Compressor is connected to a header that has 116 PSI of Pressure. The header is connected to 16 thin pipes that have nozzle tips with a 1.5 inch...

If I have a typical Fan with a given CFM or even the outside diameter of the blade can I find the exIting temperature? Is there a formula out there to determine the exit temp. Assumptions: The fan is located in the middle of a room so we are not mixing in different temperatures. Given...

I'm looking to fabricate a small version of this device http://energyconservatory.com/products/products7.htm , which is used to measure airflow through a typical residential bath fan. It adjusts to three different known hole sizes, and typically connects to a manometer that has algorithms built...

Hey guys! I'm new to the forums here and was after some help for something that I am currently working on. I need help converting cfm to thrust, i have found the formula though i can't get my head around it. Here it is: CFM = Cubic Feet per Minute = Volumetric Flow Rate Mass Flow Rate =...

I'm building a blower system with 4, 5.7 inch thu-flow motors they are 122 cfm @ 2" orfice with 2 stage blower. When I build the system will they have more cfm building the system with 4 parallel motors dumping into a funnel or y piping 2 inline systems?

I'm generally pretty good with mechanical physics, but I haven't taken a fluidics class yet to know how to answer my own question- On our racecar (http://www.mcdermottfamilyracing.com ), we have a scoop of given dimensions (that i don't have yet, but will get soon). It's of a trapezoidal shape...

I have been "googling" to find the relationship between the above, and the answer has mostly been a resounding "NO". Maybe my question is not "CFM" vs "PSI", but that is the only way I know how to descibe my question. I will explain the scenario: I have air flowing at a constant speed...

I know all procees of cfm 56 -3 . how its work and everything but i am not understanding starting system of cfm56 - 3. cfm 56 -3 has two shaft n1 and n2 . N1 is coneected with low pressure compressor , lp turbine and connected with fan . N2 shaft is coneected with hp turbine and hp...

Hi, Is it possible to calculate gasflow(cfm) given pressure(psi) and sound(dbuv). I am writing some software to report and track air leaks and the hardware the user will be using is the ultraprobe 9000. Thanks and I appreciate any information.

hello, what would be the displacement of cfm when the wind is moving at 5km/h through a cylinder 10ft in diameter by 50 feet long. Thanks!

If I have an unlimited air supply with 800 PSI and fed through a 1' pipe how do I calculate the CFM

OK, if someone could please help. I need a GENERAL rule for finding cfm in pipe 120psi at source 1/2in copper pipe 10ft drop 100ft of pipe can someone give me a VERY simple equation on how to figure out the cfm capability of this pipe? I don't need a complex long equation, i...

Hey guys, I'm a college student looking to build a miniature RC plane based off this picture here: [PLAIN]http://www.kruxor.com/wp-content/uploads/2010/07/SC2_Banshee_Art.jpg As you can see, the thrust needed to lift and mobilize the plane is provided by the two fans on the sides (does this...

I have an air compressor rated for 3.7 cfm @ 90 psi. what would the cfm be @ 40 psi? Is there a simple formula I can use?

I just want the formula that shows how to find for CFM. I have the pipe diameter and the PSI that are available. I'm just using air, nothing special.

I built the unit linked below several years ago. I wanted to rebuild it to utilize a electrostatic filter and bag filter. Right now I just run 2 filters (11 merv) before the fans and 1 filter (11 merv) after the fans. I know things like design, filters, etc all work into the calculations of...

hi, I am an electronic engineer student and I am doing a study on control systems that can be used to control a ball's height in a vertical wind tunnel. I have a problem in calculating the fans needed (as in size and number of blades) and the amount of cfm that the fans need to produce...

Hello gentlemen! I'm rather new to this whole complex world we call compressed air. :) Put simply, I have spent the past 4 hours trying to find this answer anywhere and I am just not informed enough about all these numbers to get what I need to find out. I have an air cylinder that is...

Can you help with this question? I have a solid tube 10'D x 5'L with 2 42" drum fans in one end producing about 19,000CFM each. I need to know what the velocity will be at the end of the tube in M/S. Also, will the fans be more efficient if there is a seal around the opening where the fan...

I'm currently building a device that will blow a ping pong ball vertically up a tube but don't know what fan I am going to need. Each fan gives a CFM flow rate but the problem is that I don't know how to calculate the required fan CFM i'll need in order to push the ball vertically. In other...

Hey everyone, this is my first post. A short while ago I came across web-calculator that calculated some theoretical horsepower based on values you entered. The values were CFM (amount of air flow) atmospheric pressure based on a barometer reading (you could choose either inches mercury or...

Hello I was wondering if there was someone on this forum who could help me with this. Basically my question sums up to this: There are 2 fans with equal size/power/cfm. Air must exit a 6" hole. Which design would produce the best CFM (Cubic Feet per Minute) of air flow? I have attached a...

I work at a cement distribution terminal. We load bulk powdered cement pneumatically into ships. Part of this operation is to remove the excess air from the ship by use of dust collectors. I need to know if my dust collectors are pulling enough cfm to keep up with the total cfm going into the...