H-Tec DEMO House, Operating Instructions Manual

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Pr ovide the solar module with adequate direct sunlight or with light from a powerful, concentrated
electrical light source. The shadow of an individual module created by the light must not be projected onto
another module. The water is split into hydrogen and oxygen at a ratio of 2:1. Oxygen escapes into the
room via the water reservoir. Gas production can be recognized by gas bubbles rising inside the water
reservoirs.
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The “DEM O House” is now in operation. The graphic lights up as soon as the hydrogen reaches the fuel
cell stack. Warm-up takes approximately 5 to 10 minutes. If the model is operated by solar module, and if
lighting conditions are extremely poor, warm-up may take longer.
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Hydrogen production has to be stopped if the graphic does not light up after maximum 20 minutes.
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During ope ration, small amounts of water pass through the electrolyser’s polymer electrolyte
membrane (PEM) from the oxygen side to the hydrogen side. This may cause the water level
to rise on the hydrogen side and fall on the oxygen side. In addition, distilled water is being
consumed during operation. Therefore, the water levels in the water reservoirs must be
checked during operation and, if necessary, adjusted.
If the water level needs to be adjusted, gas production must be stopped. For this purpose,
remove the connecting cables on the power source from the respective connections on the
electroly
z er.
The water levels in the water reservoirs must always be kept between the marks or at the fill
level mark (see chapter “Starting up/Filling”).
Before adjusting the water level, any hydrogen present has to be consumed.
To remove water, suck a little water from the respective water reservoir using the water bottle
with installed tube attachment. To this end, the overflow on the hydrogen side must be
unscrewed from the water reservoir in counter-clockwise direction.
Distilled water (
σ
< 2 µS/cm) can be added with the overflow in place.