Analysis on Air Compressor

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dynames07 Active Contributor Join Date: May 2008 Posts: 18	Analysis on Air Compressor 10/15/2008 9:44 AM
	Hi. I'm now trying to make a computational tool using MS excel for compressed air system energy audit. Since this will going to be my first computational tool, my aim is to provide a good estimation for users to know their compressor efficiency, recommended receiver volume, estimated pressure loss and leakage as well as the compressed air production cost. My progress now is halted due to some confusion I'm having now. 1) Compressor efficiency. There are many type of air compressor. How to calculate different compressor efficiency? Can anybody give any link or guide me to develop a basic formula to calculate different compressor efficiency? 2) There is a rule of thumb stating that 1hp will produce 4cfm of compressed air at 100psig. What about other applied pressure? Is there any good website that have compilation of compressed air production at different pressure and power? 3) How to estimate 'system volume'? How can we know proper pipe size to minimize pressure drop in the system? I've prepared my computational tool draft. Anybody that wishes to see it, just send an email to me at b9hunny@yahoo.com I appreciate any help, guide, critics etc from all of you. After all, I'm only an undergraduate student wishing to learn from people with experience rather than learning from books. Thanks
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: analysis on air compressor 10/15/2008 10:04 AM
	<...a basic formula to calculate different compressor efficiency?...> The power needed by any fluid mover is the pressure rise times the volumetric flowrate divided by the efficiency. <...proper pipe size to minimize pressure drop in the system?...> Keep the pipe velocity low. 10m/sec for gases and 3m/sec for liquids springs to mind as maximum economic pipe velocities. Any higher than this, and the pipe is undersized. <...just send an email to me at...> It is most unwise to post e-mail addresses in a global forum. Ther are easily harvested by spam-bots. <...only [an undergraduate]...> No-one is 'only' anything. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Anonymous Poster	#2 Re: analysis on air compressor 10/15/2008 11:25 AM
	Here are a couple of sites with good information: http://www.engineeringtoolbox.com/gas-air-systems-t_22.html http://www1.eere.energy.gov/industry/bestpractices/techpubs_compressed_air.html
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BudT Power-User Join Date: Mar 2007 Location: Newburgh, IN Posts: 283 Good Answers: 10	#3 Re: Analysis on Air Compressor 10/15/2008 1:18 PM
	Try this site" http://www.compressedairchallenge.org/ __________________ Bud Trinkel
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Grochy Power-User Join Date: Jan 2008 Posts: 127 Good Answers: 5	#4 Re: Analysis on Air Compressor 10/16/2008 12:51 AM
	this following site has some calculation tools and information as well http://www.kaeser.com.au/Online_Services/Toolbox/default.asp#0
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Ried Guru Join Date: Dec 2005 Posts: 1602 Good Answers: 19	#5 Re: Analysis on Air Compressor 10/16/2008 9:43 AM
	Try to review http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=air%20compressors&srchobjs=t%2Cu&order=asc for old threads on compressors. A lot of people have offered comments and opinions on compressed air distribution system design. Reviewing these threads will give you a flavor for the discussions. My humble opinion is for in plant use the system should be designed so that there is no more than a 5% pressure drop between the compressor(s) and the farthest point in the system. However there are other opinions, and sites that are useful.One other is http://www.compressedairchallenge.org/ from DOE (I think). __________________ Eventually, one needs to realize that it is far less important to be the smartest person in the room than it is to sit next to that person and make friends.
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IndustrialEnergyAuditServices Active Contributor Join Date: Apr 2011 Location: Houston, TX Posts: 16	#6 Re: Analysis on Air Compressor 04/21/2011 2:59 PM
	Wow, this is way beyond the scope of the typical forum post. I've got multiple degrees, decades of industry experience, and I'm pretty sharp at this stuff, and it took me a long time to develop the equations and spreadsheet I use. There is a lot of info on the web, but you will spend a lot of time sorting through it. Good luck with your efforts. Send me a copy of your tool and I'll look it over. __________________ Brandt Smith, CEA \| VP, Senior Energy Consultant \| Industrial Energy Audit Services
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Anonymous Poster (1); BudT (1); Grochy (1); IndustrialEnergyAuditServices (1); PWSlack (1); Ried (1)

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