Testing of Anderson's TLUD design in Cambodia 27.04.2010

Testing of the Anderson TLUD in Cambodia 27.04.2010
Sarah Carter and Vichida Tan, UK Biochar Research Centre

Similar tests have been carried out on the Anila http://www.bioenergylists.org/content/testing-anila-stove and EverythingNice stoves http://www.bioenergylists.org/content/testing-everythingni.

**Stove**: Produced by the Iron Workshop, Siem Reap, Cambodia (http://www.theironworkshop.org/). Stove had been used in a couple of practice runs before controlled testing began.
**Test**: A water boiling test (time to boil 5 litres of water, in a pan without a lid)
**Location**: The Iron Workshop, Siem Reap. A well ventilated building – 2 surrounding walls, and a roof. Wind conditions were low but variable.

**Test 1**: Cold start
**Feedstock**: 400g dry small sticks varying sizes between 5mm and 1.5cm diameter and 2cm and 10cm length. This filled up the inner chamber to 2cm from the top.
**Ignition**: Lighter and wood fibers, lit easily
**Water boiling**: 7 minutes into burn, pot put on but failed to boil after 19 minutes.
Burn: 5 mins into test, flame went out (easily recognised by smoke production – usual burn is virtually smokeless), it was easily re-ignited by blowing in the top of the stove.
Total burn 26 minutes, by this point all the biochar had been burned and ashed. When the flame disappeared the biochar had begun to burn.

**Test 2**: Hot start (the stove was not allowed to cool down before the next test began).
**Feedstock**: as test 1.
**Ignition**: failed to ignite using wood fiber, so very small amount of paraffin / petrol used
**Water boiling**: 1 minute into burn, pot put on – after 9 minutes, failed to boil. Bubbles began to form on bottom of pot.
**Burn**: good strong flame, after 10 minutes emptied due to flame dissapearing indicating biochar is beginning to burn.
**Biochar production**: 100g

**Test 3**: Hot start (as test 2)
**Feedstock**: 900g dry wood pieces, 5-15cm length, 2-4cm diameter. This filled up the inner chamber to 2cm from the top.
**Ignition**: very small amount of paraffin / petrol used.
**Water boiling**: 2 minutes into burn pot added, water boiled after 20 minutes and boiled vigerously for 5 minutes.
**Burn**: 32 minutes
**Biochar production**: 100g

**Test 4**: Hot start (as test 2)
**Feedstock**: as test 3
**Ignition**: as test 3
**Water boiling**: after 17 minutes water failed to burn. Bubbles formed on bottom of pot.
**Burn**: 4 minutes into burn flame went out. Easily re-lit with lighter
14 minutes into burn, flame went out again – probably due to wind. Easily re-ignited by blowing into stove. High flames produced, again possibly due to wind. Total burn 24 minutes.
**Biochar production**: 125g.

**Further testing and comments**:
5 repetitions will be carried out of each feedstock (other feedstocks tbd.).
A thermometer will be used in further testing to measure water temperature at regular intervals.
The Anila and Everything Nice stove have also been built and will be tested.
For more information about this project see: **http://biocharinnovation.wordpress.com/**
All comments / suggestions welcome!

Sarah carter
UK Biochar Research Centre
http://biocharinnovation.wordpress.com/