Brian Karlsen

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since Jan 12, 2016
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forest garden chicken bee
pietermaritzburg, South Africa
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Recent posts by Brian Karlsen

with chickens rabbits and deep beding their pee and manure will compost adding a few BTUs more every bit adds up
2 months ago
warning dont drink a pint of sugarcane juice after being on an extreemly low carb/sugar diet for months im starting to twitch
2 months ago
some reading has shown that a chicken produces between 8 and 12 btu maybe chickend and rabits like Joel Salaitins Raken house with your starts above the rabbit cages  depending on how cold you get in winter a few hundred animals could do it. just looked up the stats for the raken house  in a 30x50 structure they have 300 chickens and 40 does with their babys  dificult to say the btu output of the babys  but lets just estimate the litter to equal 2 adults on average and 8btu per adult gives around the equivelent of 1kw of heating  not enough for your summer crops but depeding on your insulation might be enough to keep the frost off
2 months ago
just thaught id share my surgarcane mill I baught this hand cranked one a while back its great mut just couldent get through enough cane in a resonable time to make it worth it. So I built a frame and motorised it not it will crush about 90 gallons worth of juice an hour at a curent 26% sugar in my organic sugarcane juice thats a fair amount of sugar. most of this batch will be going to rum  but my next project will be making my own jagery.
2 months ago
also found a page that said a live bunny puts out around 8btu/ hour so you can calculate from there
2 months ago
this is verry doable but needs to be sized corectly things that need to be concidered is the difrence in water temperature to desired greenhouse temp size of the radiator air flow and  water flow genraly when ive seen people try this the most comon mistake is to have too little water flow and too small of a radiator a truck radiator would probably be big enough for a small greenhouse as for flow rate you would probably need somthing about equivelent to a pool filter pump obviously if you can just use the head presure from the stream that would be ideal but you would need that sort of flow rate  as for temps you would need your water temp to be at least 20 deg f below your target temp if you could achive all this you should have a good system.

another thing to keep in mind is you would want to have a verry fine filter on the system as the water ways in the radiator are easily blocked.

one pluss of this system is it would also help to dehumidify the air in the greenhouse and the condenced water could be captured for irigation
2 months ago
you may not want to vent all the exaust a lot will be co2 which is good for plant grown during the light cycle just vent the room before you go in there
2 months ago
One thing to concider with a propane heater is while it adds some co2 it will also be adding humidity another option for co2 adition is to take up home brewing and put your fermenters in the greenhouse.
2 months ago