Nama : Rahmad Hidayat (061330310165) Rizani Firdaus (061330310166)Kelas : 4LATUGAS ENERGI TERBARUKAN

Equipment

SO4203-2A (Uni Train-I interface)

SO4203-4L (Uni Train-I board Fuel Cell

SO4203-4L1 (Plug-In module Electrolyzer

SO4203-2J ( Uni Train-I measurement accessories (shunt, connection cable, bridging plug)

LEAKAGE RATE

Hydrogen is gas with very small molecules, so small that can diffuse even through solid materials such as pipes, hoses, seals and storage tank. This is something to be reckoned with, especially at the high preassures under which hydrogen is usually stored. Every storage element continually loses a small amount of hydrogen. This amount is called Leakage Rate.

In this experiments, we will determine the leakage rate of storage and hose system employed in this Uni Train-I course.

Experiment setup

Only the basic setup is needed here

No electrical energy may be taken from the fuel cell in this experiment

Experiment procedure

Flush the stack first to make sure that the measurement results cannot be distorted by air or water vapour.

Both reservois must be emptied completely, and the water column must be at the 0 ml mark. Close the hose clamp if necessary.

Open the virtual instrument Electrolyzer via the menu path Instruments.

Let the system produce hydrogen until the level into hydrogen tank is at 50 ml.

Leave the system at complete rest for five minutes.

After that, read the level of H2 in the tank and note down your result in the evaluation section

Evaluation

After 5 minutes, the level in the H2 tank has dropped by 2 ml. Accordingly the systems leakage rate is about 0,4 ml/min.

FARADAYSS 1ST LAW: H2 CONSUMPTION

In this experiments, we will investigate faradays 1st law using fuel cell, and examine the influence of electrolysis current and time on gas consumption.

To conduct this experiments, we need to know the systems leakage rate

Experiment setup

The basic setup is needed here

The current through the variable resistor is to be measured additionally on channel B during the experiment, the variable resistor is to be supplied with energy from the stack. Prepare all the electrical necessary for this, and leave one connection unplugged so that the circuit remains open for the time being. The circuit will be closed later (flashing plug).

Experiment procedure

Flush the stack

Open the virtual instrument Ammeter B via menu path Instruments | Measure device and observe the value of the shunt resistance.

Open the instrument Electrolyzer via menu path Instruments.

Measurements of H2 consumption as a function of time.

1. Fill the H2 tank with hydrogen to a level of 60 ml

2. Now close the circuit with the variable resistor,and readjust it quickly so that a current of 600 mA through it.

3. Once the H2 level has attained 50 ml, start measure the time.

4. From then on, note the stacks H2 consumption every 60 second and record it in the evaluation section.

5. In the table, also enter the volume of H2 lost through leakage

T [s]

60

120

180

240

V [ml]

5

10

15

20

Leakage losses

0.4

0.8

1.6

3.2

Consumption

4.6

9.2

13.4

16.8

Measurement of H2 volume as function of the electrolysis current.

1. Open the variable resistors circuit again

2. Flush the stack

3. Fill the H2 tank with hydrogen to a level of 60 ml.

4. Close the electric circuit and adjust the variable resistor to set the amperage specified in the data in the evaluation section.

5. After 120 second (=2 minutes), read the consumed volume H2 and record the value in the evaluation section.

6. Carry out several measurements at the current specified in the data table over a constant time periode of 120 second in each case. Before each measurement, flush the system in the open circuit state.

7. Also enter the losses due to leakage

I [mA]

400

800

1200

V[ml]

6

12

17

Leakage losses

0.8

0.8

0.8

Consumption

5.2

11.2

16.2

Evaluation

The diagram above clearlt indicates that consumed volume H2 rises linearly as function of time. The consumed amount is therefore proportional to the time

The lower chart indicates a linear relationship between the amperage the amount of material consumed. The amount of material consumed is therefore proportional to the amperage

These result indicate that Faradays first law

Applies to the generation oh H2

Only applies to the generation of H2

Only applies to the consumption of H2

Also applies to the consumption of H2