Affugtning

Affugtning, or dehumidification, is the process of removing moisture from air or materials to control humidity. It aims to reduce dampness, prevent mold and rot, and improve comfort and material integrity in buildings, museums, warehouses, and industrial settings.

Technologies include refrigerant-based dehumidification, desiccant systems, and ventilation strategies. Refrigerant systems cool air below its dew point to condense water, while desiccant systems use absorbent materials that release moisture when heated. Desiccant and refrigerant options are chosen based on climate, humidity levels, and energy costs.

Common applications include residential basements and bathrooms, crawl spaces, archives and libraries, museums, food processing facilities, electronics manufacturing, and wood and textile industries. In homes, affugtning helps control condensation and damp odors; in archives it protects sensitive materials from deterioration.

Humidity is measured with hygrometers and data loggers, usually expressed as relative humidity (%RH). Typical targets are around 30-50% RH for living spaces and 40-50% RH for sensitive materials, with seasonal adjustments to prevent condensation on surfaces.

Effective affugtning requires source control, proper equipment sizing, energy-aware operation, and regular maintenance of filters, drains, and sensors. Sudden humidity changes or improper dehumidification can cause drafts, frost in equipment, or damage to building enclosures.