no, the instrument gives the mass of water in air at some temperature, so it is grams of water per kg of air,
how do you get steam quality from that? steam quality is grams of vaporized water per gram of liquid and vapor. for example, they need steam quality for measuring how much liquid droplets are going through a steam turbine - there is no air involved when measuring steam quality, Rossi used the wrong instrument and I am sure about this, Read up on mixing ratios - that is for air and water vapor combined and we don't care about that. On Wed, Jun 22, 2011 at 1:42 PM, Mark Iverson <[email protected]> wrote: > Jeff, > > Mass of water in = mass of water out > > It doesn't get any simpler. > > Everyone is assuming (wrongly) that they are using the instrument to measure > the liquid content > directly, which the instrument clearly cannot do. That is NOT what they are > doing. You obviously > didn't read my posting where I describe the simple algebra required to figure > out how this can be > done... > > The instrument DOES provide a (calculated) value for the mass of water which > is in the form of > vapor... Its called the mixing ratio (sometimes referred to as mass ratio) > and is displayed in > g/cubic meter, which is exactly what Galantini states... "device indicates > the grams of water by > cubic meter of steam". From that, one can easily work backward and calculate > the mass of liquid > water using simple algebra... One can calulate the mixing ratio from the > humidity. > > I agree that this is not the most desirable method, but is valid, unless > you're claiming that they > are violating the conservation of mass. > > -Mark > > > -----Original Message----- > From: Jeff Driscoll [mailto:[email protected]] > Sent: Wednesday, June 22, 2011 9:37 AM > To: [email protected] > Subject: Re: [Vo]:relative humidity > >> Yes, you're on the right track... see my posting at 6/21 at 9:04pm. >> http://www.mail-archive.com/[email protected]/msg48242.html >> >> I would bet that Galantini is making an indirect measurement of the >> liquid water content as explained in my posting. >> >> -Mark > > > no, there is no way to make an indirect measurement of steam quality using a > humidity probe that is > designed for *air* > > > HD 37AB1347 > HD37AB1347 IAQ Monitor is a tool manufactured by Delta Ohm for the analysis > of air quality (Indoor > Air Quality , IAQ). The instrument simultaneously measures several > parameters: Carbon Dioxide CO2, > Carbon monoxide CO, Temperature, Relative humidity and calculates Dew Point, > wet bulb temperature, > absolute humidity, mixing ratio, enthalpy and atmospheric pressure. All this > with the P37AB147 > SICRAM probe. The probe SICRAM P37B147 does not measure the Carbon Monoxide > CO. Also combined > temperature and humidity SICRAM probes, Hot wire Air speed SICRAM probes, > Vane air speed SICRAM > probes and temperature SICRAM probes can be connected to the instrument. The > instrument, with proper > procedure, calculates the percentage of outdoor air intake (% Outside > Air) as a function of both carbon dioxide CO2 and temperature and the > Ventilation Rate. HD37AB1347 > data logger has a storage capacity of 67,600 presets for each of the two > inputs divided into 64 > blocks. Use the software DeltaLog10 version 0.1.5.0. The instrument is > equipped with a large dot > matrix graphic display with a resolution of 160x160 points. Standards: ASHRAE > 62.1-2004, Decree Law > 81/2008. The rules apply to all enclosed spaces that may be occupied by > people. Should be > considered, depending on air quality, chemical contaminants, physical and > biological or outdoor air > flow inside inadequately purified (Ventilation Rate). Typical applications of > the instrument with > the range of sensors mentioned above are: - Measure IAQ and comfort > conditions in schools, offices > and indoor. - Analysis and study of sick building syndrome (Sick Building > Syndrome) and > consequences. - Verification of HVAC system. - Investigation of IAQ > conditions in factories to > optimize the microclimate and improve productivity. - Audits in Building > Automation. > DELTA OHM, SIT, calibration centre > > http://www.deltaohm.com/ver2010/uk/st_airQ.php?str=HD37AB1347 > ======================================== > > > note the work enthalpy in the above text, it measures the enthalpy of > the humid air! not steam quality !!! > >
