On 08/12/2010 01:30 AM, Ken Gotberg wrote:
Hi David
A person expends about 13 MJ per day or 150W. I still don’t understand why you
relate this fact to the energy required for a rocket/gasification stove or a
solar concentrator to boil water??? In either case the energy is coming from
the Sun and not from people (people also expend stored up solar energy).
Okay, but that does not address the energy necessary to remove the water
from the CaCl2 solution and chill it to a level suitable for human
consumption. You are not boiling water, but boiling a solution of CaCl2
and water, which should (if my memories of High School Chemistry are
correct), have a higher boiling point than water.
The energy necessary to remove the water of hydration (IIRC) is also
higher than the energy needed to boil the same amount of water. We are
discussing how much high quality energy will be needed to make enough
water to provide for a person or a family in an area. That is the
energy I am discussing, not the energy that the person generates.
Each liter of water needs an amount of energy to bring it to a point
where it can be used by the humans. Why not run the gasifier directly
into a refrigeration unit and expose refrigerated tubing to the
atmosphere? It would generate water when the surface was below the dew
point and the Servel cycle is well understood. See
http://en.wikipedia.org/wiki/Absorption_refrigerator for a description,
the heat source could easily be solar or gasifier based.
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