Dear Peter
You are quite correct about the need for winter supplementation of Northern
Greenhouses with CO2 in the cold months. This is typically done with a
propane or natural gas heater venting directly into the growing space.
Gasifiers would make an excellent CO2 supplementation system also. However,
it would be fatally important to have a safe system because of the poisonous
nature of CO. The safety system should at least have:
1: Flame failure detection and automatic gas flow shut-off when flame
failure was detected.
2: CO detection and automatic gas flow shut-off when high CO was detected.
The best system would probably have both indirect gasifier heating (with
combustion gases vented outside) and a burner system within the growing
space, so that the Grower could control temperature and CO2 levels
independently.
Best wishes,
Kevin Chisholm
----- Original Message -----
From: "Guag Meister" <[email protected]>
To: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
Sent: Thursday, December 16, 2010 1:26 AM
Subject: [Gasification] Gasifiers and greenhouses and CO2 augmentation.
Hi All ;
Air normally contains about 300ppm of CO2, and this is barely above
starvation level for most plants. Raising the CO2 levels to 1,000 ppm or
even higher can result in increased growth of most plants by 20%-100% (if
given sufficient light to utilize this CO2 by photosynthesis).
Increased CO2 is a well established technique for marijuana growers as one
example (I am not recommending that anyone grow marijuana, this is just an
example). Apparently the cannabis plant developed during a previous time on
the earth with much higher CO2 levels than present. Growth can be increased
by as much as 100%, a very interesting prospect for growers of this high
value cash crop.
Northern greenhouses will necessarily be as airtight as possible to prevent
heat loss. An undesirable effect from this is low levels of CO2 as the
plants scavenge the available CO2 which is not replaced. This results in
very low levels of CO2 inside the greenhouse and reduced plant growth.
I searched and found one example of heating a greenhouse with a gasifier,
unfortunately this installation puts the gasifier outside and does not
attempt to capture the CO2.
http://news.yahoo.com/s/ap/as_japan_extinct_fish_found
A gasifier inside a greenhouse would result is 50% less fuel burned and 50%
more plant growth. Seems to me that markets of gasifiers have a large
potential market here that no one that I can see is capitalizing on. Is
anyone doing this?
Best Regards,
Peter G.
Thailand
www.gac-seeds.com
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