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Cast Batch Box Rocket Mass Heater using LTGS  RSS feed

 
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Satamax Antone wrote:Fill with concrete. Sand insulates.



Another alternative would be to fill them with Cob.  I have plenty of sand and clay on hand. 
 
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Steve Shelton wrote:

Satamax Antone wrote:Fill with concrete. Sand insulates.



Another alternative would be to fill them with Cob.  I have plenty of sand and clay on hand. 



Yes. Tho it's not as fluid as concrete.  Ans, since i've been there and donne that.  Vibrating witha vibrating sander work not too bad. 
 
Steve Shelton
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Here's a pic of the same cement block that is covered in thin-set is now further covered in Geopolymer (GP).    The big test is which trowel notch size provides the best adhesion.  I will go with the smallest notch size with good adhesion.   This will provide the most efficient use of materials. 

IMG_20180729_140349.jpg
[Thumbnail for IMG_20180729_140349.jpg]
 
Steve Shelton
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The "redneck solution" Bell is now built.  It will be used temporarily to test the flow of air through the system.  Some time within the next week or so I'll fire it up. 

I hope to achieve a solid "Rocket" sound and temps exceeding 900 degrees F at the bell. 

IMG_20180730_140937.jpg
[Thumbnail for IMG_20180730_140937.jpg]
 
Steve Shelton
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Steve Shelton
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Temperature just above the riser inside the bell.
dsr-with-bell-test-2.jpg
[Thumbnail for dsr-with-bell-test-2.jpg]
 
Steve Shelton
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Temporary Bell is leaking badly
IMG_20180805_121616.jpg
[Thumbnail for IMG_20180805_121616.jpg]
 
Steve Shelton
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Extending the chimney to 6' above bell top increased the temperatures.
IMG_20180805_122956.jpg
[Thumbnail for IMG_20180805_122956.jpg]
 
Steve Shelton
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I ran one last test to document the temperature progression through the initial stages of a burn.    This demonstrates the insulative properties of the Geopolymer Settings.

This was a small burn with half of the Batch Box filled with wood.  
DSR-with-Bell-temperature-progression.jpg
[Thumbnail for DSR-with-Bell-temperature-progression.jpg]
 
Steve Shelton
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Steve Shelton
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Here's a pic of the 1st layer of the permanent Bell.  It is nearly complete.  I need to fill the remaining blocks with Cob to finish it.   The frame of the DSR is shown to show where it will fit.  However, it will be located on top of the 4th layer. 
DSR-Bell-1st-Layer.jpg
[Thumbnail for DSR-Bell-1st-Layer.jpg]
 
Steve Shelton
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Steve Shelton
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The Bell is complete.  Next steps include installing the Bell Roof, Fire Wall behind, and hooking up the Chimney. 
IMG_20181104_124815.jpg
[Thumbnail for IMG_20181104_124815.jpg]
 
Steve Shelton
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