I am going to be working with the
biodigesters. As I said before, a biodigester breaks down organic matter
(manure) and as a byproduct, methane is produced. The methane gas is then
burned in a stove for cooking (like a gas stove in the US). These gas stoves
are much safer than the traditional wood stoves (like the one my host family
had in language school) because they do not produce the dangerous smoke and
particulate matter as wood burning stoves.
I am going to be doing a study on
that compares the thermal efficiencies of the different types of stoves. There
are two types of stoves that are attached to a biodigester. One is a stove that
is made by EOS. It is not very pretty but it does the job. However, the flame
is very hard to control due to the low pressure of the gas. Then there is a
commercially bought stove that looks nicer and can control the flame a little
better for burning. I will be comparing these two stoves to each other and also
to the traditional wood stove. In addition, I will be doing the test on a
commercial stove that is attached to a propane tank. Propane is very expensive
here, and some of the engineers here are hoping to show that the biodigester
has similar thermal efficiencies to the expensive stoves while being a fraction
of the cost.
I am going to measure the thermal efficiency
of each type of stove by doing what is known as a water boiling test. It is
actually a series of three tests done in rapid sequence. In the end, I will
know how much energy it took each stove to boil a pot of water. The thermal
efficiency is then how much energy each stove used divided by how much energy
that pot of water should have used in a “perfect” world. I have to weigh all
the wood before and after the test, the pots, and the water before and after. I
also have to figure out the amount of water in the wood, the type of wood, and
the local boiling point, which may be different than 100C due to elevation. For
the gas stove, I also need to be able to estimate the volume of gas in the
biodigester after each portion of the test.
I need to repeat each test three
times for each stove to ensure accurate results and to be able to run some
simple statistics on them. I also don’t want to disturb a family’s cooking
routine too much, so I am only going to test each stove once per week and
stretch it out over a three week period. I would also like to add that one of
that has the biodigester with the commercial stove and a traditional stove
offered to be my host family for three weeks while I am doing my testing. They
live about 20 minutes by bus away from the office in a very nice house in the “campo”.
They also live across the street from the family with the biodigester attached
to the homemade stove. Therefore, on Monday, I will be moving in with them. The
plan is to do my testing in the mornings and then take the bus into work in the
late morning or early afternoon and spend some time in the office doing other
things. This way I can also have the internet.
I will have pictures and more
explanations as time passes if there is any confusion or uncertainty. Sometimes
I struggle to explain myself well because I know what I am doing and can easily
forget to mention some key details. This is why I seem to be continually
updating my plan of work here haha. If there are any blaring questions, feel
free to email me at lgeiger09@gmail.com
though.