Dear all - We're considering setting up a warming experiment using small
open-top chambers (1 m dia x 1.2 m tall). We have blowers that ventilate
the chambers at about 500 cfm. If anyone has any experience with heating
air in such chambers, and could provide some advice on what heaters to
get, and what power, we'd greatly appreciate it. We want to elevate air
temperatures above control chambers by ~4C.
We do not anticipate adjusting the RH in the warmer chambers. Our
reasoning is that if it gets warmer, RH will go down due to the higher
temperatures.
If air is at 50% RH at 25C, the VP would be 1.5791 KPa, and air VPD
would be 1.5791 KPa. If raised to 28C, the new RH would be 42%, an 8%
drop. That's not particularly large with respect to what it might do to
leaf conductances. And besides, adding in RH control to this system is
beyond our financial means for right now. Anyone have a problem with
this reasoning?
Thanks all!
Howie Neufeld
--
Dr. Howard S. Neufeld, Professor
Mailing Address:
Department of Biology
572 Rivers St.
Appalachian State University
Boone, NC 28608
Tel: 828-262-2683; Fax 828-262-2127
Websites:
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