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Offshore platform, ship, marine engineering, nuclear power, satellite launch center

To ensure worker comfort, enhance work efficiency, or prevent static electricity from interfering with the normal operation of equipment, it is essential to maintain appropriate temperature and humidity levels in the working environment. Typically, temperature control involves either cooling or heating. When cooling is required, some moisture is removed from the air; conversely, when heating is needed, the outdoor air often has a very low moisture content. Therefore, these environments invariably require humidification.

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Library Museum Hotel Office

Humidifying the air can prevent damage to collectibles caused by the drying and cracking of fibers due to excessively low relative humidity from air conditioning. Many priceless manuscripts, books, artworks, floppy disks, magnetic tapes, and other items housed in museums—without being stored in spaces with proper temperature and humidity control—can easily suffer severe damage. However, environments suitable for these items often have lower temperatures, which can be uncomfortable for visitors. Generally, the lower limit for relative humidity for paper-based collections in museums is 40%; for items such as floppy disks and magnetic tapes, which need to be protected from drying out and becoming brittle, the lower limit is 36%. Organic collections, on the other hand, require even lower-temperature environments. Moreover, museum collections typically alternate between display areas and storage rooms; it’s important to note that even in environments with controlled temperature and humidity, heat conduction from outside walls or radiation from switching lights can still cause fluctuations in surface temperature, leading to moisture evaporation and structural damage to the collections. Furthermore, when a collection is moved from a cooler storage room into a warmer display area, its surface temperature gradually rises, causing internal moisture to migrate toward the surface and condense there—a phenomenon known as "moisture transfer." This process can accelerate the deterioration of the collection. The following temperature and humidity levels are recommended for museum environments:

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Modern agricultural edible mushroom preservation and refrigerated food processing

The normal growth of edible fungi and other plants requires appropriate temperature and humidity conditions. To store foods such as fruits and vegetables, it is necessary to control the temperature and humidity of the air in order to maintain the quality and freshness of agricultural products. Generally, the humidity should be kept between 70% and 95% RH. Low relative humidity can lead to increased moisture loss in fruits, resulting in a decline in their quality grade and ultimately affecting profitability. In food processing—such as baking bread, cakes, and confectionery—both the production process and storage must prevent food cracking caused by excessively low relative humidity.

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Data center computer room, programmable control room

Increased static electricity can easily damage integrated circuit chips. In data centers, preventing service interruptions is critical, and humidification systems must ensure both reliability and redundancy.

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Spray painting workshop (for industries such as aerospace and automotive)

If the relative humidity of the air is too low, the adhesion of the paint will decrease. On the other hand, if the relative humidity is too high, the glaze layer sprayed onto the product may become excessively diluted, forming tiny liquid bubbles. As these bubbles evaporate during the drying process, they can lead to poor spraying results and the formation of fine pits on the sprayed surface.

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Textile printing cigarette factory, wood processing, precision machining, detonator plant

Air humidification can prevent fiber cracking and static electricity caused by excessively low relative humidity in the air, thereby avoiding disruptions in the production process and ensuring good product quality. The recommended temperature and humidity levels are as follows:

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