richsoil.com/heat Ernie and Erica are back at it with another challengeing build of a rocket mass heater. This time it's in a tipi and they intend to run the chimney out of the wall. Erica explains why such a thing is a challenge. She explains how heat moves though a structure and why radiant heat is important as well of the benefit of conductive heat. In a tipi the air doesn't stick around for long so this design is focused on extracting as much heat from the rocket mass heater as possible through radiant and conductive heat.
The team then get to work building the tipi with guidance from Ernie. Once that's done, it's time to get to work mixing up the cob and getting other materials ready for the rocket mass heater. Erica then explains how the ducting will work inside of the heater. Then she goes into the tipi and explains how the space will be laid out, with a double bed and a bench. Erica takes careful measurement to ensure that the barrel for the heater will be far enough away from the walls of the tipi.
Construction begins with a solid base of stones. Erica mentions that the more solid and level this base is, the easier it will be to build on top of. She then explains that two people working together can fit all of the duckwork together easily, just be careful, the edges are very sharp. Once the fit is perfect and there are no kinks or gaps, seal the duct work with sheet metal screws or high temperature foil tape. Leaving a few joints unfinished, will allow you to move key points into their final spaces, more easily. Once in their final place, be sure to finish them too. Ideally, there will be a slight rise all the way through the duct work to allow the flow of heat to be smooth to avoid hot spots.
Then it time to get the cob in place, trying not to disturb the placement of the ducting. Erica also explains the heat shields that are designed to reflect heat away from the tipi walls. Then they install a T fitting for an ash clean-out area. Next, the core of the rocket mass heater is fitted and installed, followed by the heat riser and the barrel.
Now it's time to light some paper and prime the heat riser so that the smoke gets pulled through the system to the outside of the structure. This is called a thermosiphon. The heater is now ready to go through a drying process before being finished with a layer of plaster for aesthetics and comfort. Paul and Erica catch up a few years after the build and give a little more info about the performance of the rocket mass heater in a tipi. It's performed quite well, even in temperatures of twenty-six degrees below zero.
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Thanks to Dan Ohmann of The Grass-fed Homestead channel for helping me with the editing:
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