Thanks, Don.  That's what I was hoping for.

Assuming the assumptions and calculations are correct, then the volumes 
are not huge in terms of the volume of the region around the evaporators.  
That explains what we see. 

I'm busy right now, but for further contemplation, here are some snips from 
my notes.  Origins uncertain.  The first could be from BEE-L.  The second 
looks like Wikipedia.
---

The physical properties of oxalic acid may be of interest in this connection. 
The stuff one buys is usually oxalic acid dihydrate, which is a crystal which 
has two water molecules attached to each oxalic acid molecule. The CRC 
Handbook of Chemistry and Physics gives the following properties for 
oxalic acid dihydrate:

On heating:

1) The water of hydration leaves at 101.5° C (214.7° F) The water boils 
off leaving anhydrous oxalic acid crystals.
2) At 157° C (314.6° F) the oxalic acid starts to sublime (goes directly from solid to gas)
3) At 189° C (372.2° F) the oxalic acid which has not yet sublimed decomposes to formic acid and carbon monoxide.


From somewhere on the Internet:  I was investigating using an iron as a heat source since I am not happy with unregulated evaporators and was looking for something with regulation and also considerable mass.
---

Recommended ironing temperatures

Textile Temperature [citation needed] Temperature [1] Dot mark Toile 240 °C 
Triacetate ("Estron", "Silene", "Tricell")

200 °C 220-250 °C

Cotton 204 °C / 400 °F 180-220 °C * * * [8] Linen (flax) 215-240 °C * * * [8] 
Viscose/Rayon 190 °C 150-180 °C * * [8]

Wool 148 °C / 300 °F 160-170 °C * * [9] Polyester 148 °C / 300 °F * [8]

Silk 148 °C / 300 °F 140-165 °C * [9]

SympaTex * [8]

Acetate ("Arnel", "Celco", "Dicel")

143 °C 180 °C * [9]

Acrylic 135 °C 180 °C Lycra/spandex 135 °C

Nylon-6 150 °C

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html

Guidelines for posting to BEE-L can be found at:
http://honeybeeworld.com/bee-l/guidelines.htm