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14-01-2009, 03:51 AM #1
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Calculating pressure drop for metering device
Going to be doing a heat pump experiment in basement with some used parts/compressors, etc.... Thinking of using 3/16" tubing as the metering device... but I can't find any kind of calculators, formulas, etc online to compute with a given head pressure and suction etc, to get how long of a piece of tubing do I need to get x-amount of pressure drop....
Thoughts anyone?
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14-01-2009, 06:15 AM #2
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Re: Calculating pressure drop for metering device
Start with calculating refrigerant flow rate required, then friction of 3/16 per metre, use a formulae to convert to pressure drop. Or you could just use a cappillary tube and ring tube manufacturer for rattings/usually provided on ctube packet in a table.
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14-01-2009, 09:15 AM #3
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Re: Calculating pressure drop for metering device
Why are you fixed at 3/16" tubing?
Capillary tubes are cheap and easily available.
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14-01-2009, 12:00 PM #4
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Re: Calculating pressure drop for metering device
I have some 3/16" right now... the thing I'm not real crazy about with cap tubes is that they clog. With a larger diameter tubing, it would be less apt to clog... I heard of a story that years ago Lennox used such a method for their systems...
Tesla, thanks for the direction... any idea what the friction of 3/16 tubing is?
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14-01-2009, 08:48 PM #5
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Re: Calculating pressure drop for metering device
Hi Kn, Have a look at this there is a free download
Originally Posted by knkreb
http://www.pipeflow.co.uk/public/con...FY0wpAodtme74Q
Regards NormMy wife used to say you never listen to a word I say at least I think that what she said
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17-01-2009, 02:33 PM #6
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Re: Calculating pressure drop for metering device
You have DIRECTCALC from DANFOSS
xxx://xxx.danfoss.com/BusinessAreas/RefrigerationAndAirConditioning/Product+Selection+Tools+Details/DIRcalc.htm
or
coolpack
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