Humidity control

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Humidity control

Indoor air remains dry, even during the rainy season. You will never have to worry again about mold or dew condensation.

Shirasu-kabe has a moisture absorptive property which absorbs moisture when the indoor humidity is high, and releases the moisture when the indoor humidity is low, maintaining a comfortable level of humidity.
During peak summer humidity, this absorptive property holds down the indoor humidity, reducing the temperature and thereby cutting electric power consumed by air-conditioners.
Also, by discouraging dew condensation, it can prevent the appearance of mold or mites caused by humidity.

Formaldehyde absorption and discharge test

Image of Formaldehyde absorption and discharge test

How effective are Shirasu-kabe’s humidity-conditioning properties?

The data below confirms how Shirasu-kabe’s humidity-conditioning properties keep indoor air comfortable.

Chart of Shirasu-kabe moisture absorption test

A 15 × 15 cm section of wallboard plastered with Shirasu-kabe was placed in a 10 liter desiccator set to 93% humidity (and temperature of about 30ºC).

  • The test conditions were designed to approximately simulate a room with Shirasu-kabe applied to the entire wall, ceiling and floor space.
  • The Shirasu-kabe wallboard section was dried for 3 hours at 90ºC then cooled and placed in the desiccator.

Chart of Shirasu-kabe moisture release test

At the end of the moisture absorption test, the Shirasu-kabe wallboard section was promptly placed in a 10 liter desiccator set to 17% humidity (and temperature of about 23ºC).

  • The test conditions were designed to approximately simulate a room with Shirasu-kabe applied to the entire wall, ceiling and floor space.

Observations

During the moisture absorption test, the humidity reached 54% (a comfortable level) after 30 minutes, then leveled off at about 45% after 60 minutes. During the moisture release test, the humidity reached 25% after 35 minutes, 27% after 80 minutes, 28% after 250 minutes, then changed gradually thereafter. Although Shirasu-kabe seems less effective at releasing moisture than absorbing moisture, our results suggest a slow release of moisture over an extended period. Shirasu-kabe may be so slow to release moisture because the cavities in the shirasu particles are so effective at capturing and retaining water that they impede the ability of the circulating air to rise to the humidity of the shirasu in the room.

Energy-Saving Properties

The humidity-conditioning properties of Shirasu-kabe enable it to absorb the humidity of moist indoor air, making rooms feel more comfortable in hot weather. When the indoor air becomes dry, Shirasu-kabe releases the humidity stored within the wall. These properties let users raise their air-conditioning temperature setting in summer and live comfortably without air-conditioning for a longer period of the year. Shirasu-kabe can also eliminate the need for clothes driers, since even in wet weather, laundry can be dried quickly indoors without leaving any unpleasant lingering laundry odors. In addition, Shirasu-kabe’s outstanding deodorizing property purifies indoor air and eliminates the need for air purifiers. Shirasu-kabe helps keep the indoor air environment comfortable without the need for energy-consuming appliances.

Takachiho’s Shirasu-kabe Products

  • Biocera
  • Biocera Light

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