The document describes a practical experiment to determine the biogas consumption rate and efficiency of a biogas stove. The procedure involves measuring water temperature and gas flow while heating water until it reaches a specified temperature, leading to calculations of thermal efficiency. The results indicate a thermal efficiency of 24.62% and a biogas consumption rate of 0.011 m3/min.

1. ERG 211 RENEWABLE ENERGY AND GREEN
TECHNOLOGY (1+1)
Practical - 6
Experiment on Biogas Applications
Aim: To determine the biogas consumption rate for cooki
ng and find out the efficiency of biogas stove.

2. Experiment on Biogas Applications

3. Experiment on Biogas Applications
Procedure:
1. Connect the stove under test and the manometer shall in
dicate 76 mm of water column pressure (7.6 gf/cm2) whe
n the burner is ‘ON’.
2. Pass the biogas for a few minutes to purge the system of
air and to establish the required gas pressure.
3. Engage only one burner of the appliance at a time during
the test, and the gas delivered to the stove shall flow thr
ough the jet of the burner being tested.

4. Experiment on Biogas Applications
Procedure:
4. Take known quantity of water in a broader pan with lid a
nd place it on the burner (stove).
5. Measure the water temperature and gas flow using t
hermometer and flow meter, respectively.
6. ‘ON’ the gas tap and light the gas.

5. Experiment on Biogas Applications
Procedure:
7. Allow water in the pan to warm steadily until it reac
hes temperature about 80oC, then start stirring and conti
nue until the end of the test.
8. ‘OFF’ the gas flow, when the water temperature reac
hes 90 ±1oC.
9. Record the maximum temperature (t2).
10. Quantity of gas used during the test can be measured b
y observing the flow meter reading.

6. Experiment on Biogas Applications
Calculation
The thermal efficiency (e) can be calculated by the followin
g formula.
Where,
G = quantity of water in the vessel in kg,
W = water equivalent of the vessel along with lid
and stirrer
t2 = final temperature of water, °C
t1 = initial temperature of water, oC
V = gas consumption, litres
H = calorific value of the gas, kcal/l

7. Experiment on Biogas Applications
Observation
Weight of the empty container = 400 g (0.4 kg)
Weight of the container with water = 2.2 kg
Weight / quantity of the water (G) = 2.2–0.4=1.8 kg
Water equivalent of the vessel along = 0.2 kg
with lid and stirrer (W)

8. Experiment on Biogas Applications
Observation
Final temperature of water, °C (t2) = 98oC
Initial temperature of water, ºC (t1) = 33oC
Gas consumption, litres or m3(V) (10 min) = 0.11 m3
Calorific value of the gas, kcal/m3 (H) = 4800 kcal/m3

9. Experiment on Biogas Applications
Calculation
The thermal efficiency (e) can be calculated by the followin
g formula.
e = 24.62 %
Biogas consumption rate = 0.11 / 10 = 0.011 m3/mi
n.
Results
Thermal efficiency of the biogas burner = 24.62 %
Biogas consumption rate = 0.011 m3/min.