[Stoves] Calc. void space and pellet particle density

[Frank Shields]

1555.68

sand

						

1053.17

water (vol)

					

671.78

pellets

						

152.47

pellets used

					

1539.82

Pellets + Sand

					
								

0.637865

Bulk density Pellet 

	671.78/1053.17

		

1.47714

Sand bulk density

	1555.68/1053.17

		
								

1387.35

Sand used when mixed with pellets

1539.8-152.47

	

168.33

Sand not used

		1555.68-1387.35

	

113.9567

Vol sand not used 

		168.33/1.477

	

1.337965

pellet density

		152.47/113.95

	

502.091

pellet vol in bottle

		671.78/1.337965

	

551.079

void space

		1053.17-502.091

	

52.32574

% voids

			551.079/1053.17*100

								

Tare a glass narrow neck bottle

Fill with sand -weigh

Fill with pellets weigh

Fill with water - weigh (vol of glass jar)

Calc bulk density of sand and pellets

 

Weigh a handful of pellets

Add sand > sprinkle in pellets > add sand > sprinkle in pellets until all
pellets are in bottle and topped off with sand

Weigh sand + pellets mix

Calc sand in mix 

Calc sand NOT in mix

Calc volume of sand NOT in mix using sand bulk density

Calc. particle density of pellets from wt hand full of pellets / volume of
sand not in mix.

Calc pellet volume in liter bottle when filled with pellets 

Calc. void space in bottle left 

Calc percent voids from void / total vol of liter bottle X 100

 

I fill with sand then tap twice on the counter then top off with sand. 

 

This is a sample from a local US pellet source. The bulk density is 0.638
g/cc and the particle density of the pellets is 1.338 g/cc

Void space for air movement in a TLUD filled with these pellets is 52.3% 

 

Instead of sand one can use water or acetone for other materials. The
particle density of sand (or like) I find best done using acetone.  

 

 

Hope the calcs are correct. : )

 

Regards

 

Frank

 

 

Frank Shields

Control Laboratories; Inc.

42 Hangar Way

Watsonville, CA  95076

(831) 724-5422 tel

(831) 724-3188 fax

frank at biocharlab.com

www.controllabs.com

 

 

 

 

From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
Dean Still
Sent: Thursday, March 06, 2014 11:21 AM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Cuber and size of densifying machines. (no longer Re:
The wood and char and fuel "debate" )

 

Hi Tom,

 

In Uganda the pellets were too dense and were hard to light. Do you know the
density of USA heating stove pellets?

 

Best,

 

Dean

 

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