Compost Heat Recovery
I'm writing a series of blog posts on compost heat recovery, that is, using compost to heat a greenhouse, a living space, a workshop, etc.
The new post is about a small working model I put together of a "compost water heater", and just some general thoughts on taking on little projects regarding appropriate technology. I had posted the first one to the old forum, it introduced the subject, and looked at an early pioneer in the technology, the French organic farmer, Jean Pain. I'll post links to both post below.
My main source for this is the book The Compost Powered Water Heater by Gaelen Brown. It describes a number of systems, and focuses on the type of system that was worked out by the Compost Power Network, out of Vermont. Basically, they spiral water piping throughout large compost piles, made mainly of shredded woodchips, with sawdust and manure added. The water is pumped through this coil, and then have been run to structures like greenhouses, concrete slabs, radiators, etc. to heat them.
The book also outlines more complex systems, that have so far been successful in small-to-mid-sized agricultural businesses, especially dairy farms. They draw air down through hot compost that is indoors, move it through channels in the floor into heat exchangers to transfer the heat, then filter the air through soil bio-filters. These systems can be a way for a farm to compost animal manure, reduce bedding costs, generate heat and biogas, and to filter wastes.
I don't like to leave people with so much reading before they post, so if anyone wants to share their ideas on compost heat recovery without reading the blogs, please feel free by all means. If anyone would like to read more, the posts are there. There are also a lot of good videos on youtube.
Compost Water Heater Model: http://ecotechnicinklings.blogspot.com/2019/01/compost-water-heater-tabl...
Compost Water Heater: An Early System: http://ecotechnicinklings.blogspot.com/2018/11/the-compost-powered-water...