- Original Message
From: Stephen A. Lawrence sa...@pobox.com
To: vortex-l@eskimo.com
Sent: Sun, January 23, 2011 10:48:48 PM
Subject: Re: [Vo]:HP474AC probe measures Relative Humidity, not steam quality
On 01/23/2011 10:32 PM, Harry Veeder wrote:
Stephen A. Lawrence
On 01/23/2011 01:12 AM, Horace Heffner wrote:
This whole issue /[of steam quality measurements]/ may be of academic
interest only...
Only if another demonstration is done with no input (closed loop).
Otherwise it's still extremely interesting because, if this measurement
was botched as
Horace Heffner hheff...@mtaonline.net wrote:
We can thus see from this table that if 1 percent by volume of the steam is
entrained water micro-droplets, easily not seen in tubing or exhaust ports,
that only 5.6 percent of the heat of vaporization is required to produce
that mixture.
I do
Stephen A. Lawrence wrote:
If it's pure steam (no entrained air) at 100 C, then the RH must be
100%, a priori, since the vapor pressure of water at 100 C is 1
atmosphere.
I think it is mixed with air, otherwise the water pump would have to work
harder
and harder as a vacuum is
On 01/23/2011 09:49 PM, Harry Veeder wrote:
Stephen A. Lawrence wrote:
If it's pure steam (no entrained air) at 100 C, then the RH must be
100%, a priori, since the vapor pressure of water at 100 C is 1
atmosphere.
I think it is mixed with air, otherwise the water pump would
- Original Message
From: Stephen A. Lawrence sa...@pobox.com
To: vortex-l@eskimo.com
Sent: Sun, January 23, 2011 9:58:57 PM
Subject: Re: [Vo]:HP474AC probe measures Relative Humidity, not steam quality
On 01/23/2011 09:49 PM, Harry Veeder wrote:
Stephen A. Lawrence wrote
On 01/23/2011 10:32 PM, Harry Veeder wrote:
Stephen A. Lawrence wrote:
No, I don't think so. The stuff pumped out of the supply tank, and into
the reactor, is 100% water; air comes into the supply tank at the top
and displaces the water in the tank as it's pumped out.
Well you
Rossi used this electronic device for electronic measurement (as was
reported) - model HD37AB1347. Relative Humidity probe model HP474AC
was attached to it.
Page three of this link (thanks to Horace) shows details of that probe
connected to the electronic device. HP474AC has the following
In reply to Jeff Driscoll's message of Sat, 22 Jan 2011 21:24:36 -0500:
Hi,
[snip]
This probe does not measure the amount of liquid water droplets in the
steam (ie. mass fraction of water vapor to to total water). It measures
Relative Humidity (Relative Humidity measures how saturated the air is
Robin van Spaandonk wrote:
Consider that droplets can't form unless the RH is 100%. Anything less than
that
and no droplets form.
In short if they measure an RH 100% then the steam must be dry.
So, if the RH is below 100% you can surmise the steam is fully dry (0% wet)but
if the RH is
On 01/22/2011 10:13 PM, mix...@bigpond.com wrote:
In reply to Jeff Driscoll's message of Sat, 22 Jan 2011 21:24:36 -0500:
Hi,
[snip]
This probe does not measure the amount of liquid water droplets in the
steam (ie. mass fraction of water vapor to to total water). It measures
Relative
In reply to Stephen A. Lawrence's message of Sat, 22 Jan 2011 23:05:10 -0500:
Hi,
[snip]
If it's pure steam (no entrained air) at 100 C, then the RH must be
100%, a priori, since the vapor pressure of water at 100 C is 1
atmosphere.
True, but they are likely to have measured somewhere past the
In reply to Harry Veeder's message of Sat, 22 Jan 2011 19:36:13 -0800 (PST):
Hi,
Robin van Spaandonk wrote:
Consider that droplets can't form unless the RH is 100%. Anything less than
that
and no droplets form.
In short if they measure an RH 100% then the steam must be dry.
So, if the RH
On Jan 22, 2011, at 5:24 PM, Jeff Driscoll wrote:
Rossi used this electronic device for electronic measurement (as
was reported) - model HD37AB1347. Relative Humidity probe model
HP474AC was attached to it.
Page three of this link (thanks to Horace) shows details of that
probe
So, reiterating what others are saying in reply to my email:
The HD37AB1347 device with the HP474AC probe is designed to measure air with
0% to 100% humidity. It is not designed to measure pure water vapor with
tiny liquid droplets (including zero liquid droplets) in it.
It isn't even close -
they made
the measurements?
-Mark
-Original Message-
From: mix...@bigpond.com [mailto:mix...@bigpond.com]
Sent: Saturday, January 22, 2011 9:23 PM
To: vortex-l@eskimo.com
Subject: Re: [Vo]:HP474AC probe measures Relative Humidity, not steam quality
In reply to Stephen A. Lawrence's message
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