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Guangdong Renjie Environmental Technology Co., Ltd.

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Steam Humidification

Boiler-type steam humidifier (single-tube jet type)

Boiler-type steam humidifier (rapid-absorption type)

Electric steam humidifier (split type)

Electric steam humidifier (integrated type)

Water Mist Humidification

Wet-film humidifier

Wash-type humidification system

High-pressure micro-mist humidification system

Two-fluid ultrasonic spray humidification system

Applications

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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Inspection or environmental testing organizations (laboratories, aging chambers)

1. Weathering Tests: These include individual tests for temperature, humidity, corrosion, or fungal growth, as well as combinations of the aforementioned factors. 2. Performance Tests: These encompass tests for vibration, electrical shock, acceleration, radiation, or pressure. Typically, multipurpose laboratories have a wide range of temperatures (2–85℃) and relative humidities (2–98% RH) to accommodate the needs of various testing environments. Given the broad range of temperature and humidity adjustments required, it is essential to select an appropriate humidification method based on the specific humidity control requirements and site conditions in different areas to ensure the accuracy and reliability of test results.

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Cleanroom semiconductor electronics factory circuit boards

Humidification can prevent static electricity caused by excessively low relative humidity, which may lead to equipment malfunctions and increased product defect rates. In cleanrooms used in electronics factories, semiconductor plants, and printed circuit board facilities, the temperature is typically maintained at a constant around 22°C; therefore, year-round air conditioning and precise control of temperature and humidity are essential to prevent static electricity, condensation, corrosion, fiber breakage, and discomfort among workers. When relative humidity exceeds 60%, corrosion may occur; conversely, when it falls below 40%, static electricity becomes more likely. Thus, before components enter the cleanroom, they usually need to be kept in a specific temperature and humidity environment. This ensures that no condensation occurs due to temperature differences upon entering the cleanroom, thereby preventing moisture damage to the components, or the generation of static electricity that could cause dust and impurities to adhere to the components, compromising their quality and functionality.

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Humidification Knowledge

The purpose of humidification

According to the purpose of humidification, it can be broadly divided into two types: 1. Comfort Humidification According to statistical analyses from the international HVAC community, humans feel most comfortable and achieve the highest work efficiency when living and working in an environment with a temperature between 22°C and 26°C and a relative humidity ranging from 40% to 65% RH. Dry air, on the other hand, can lead to: A significant increase in the airborne dispersion of dust particles, causing dryness and itching of the skin, making people feel uncomfortable. Typically, such environments serve as breeding grounds for various bacteria, leading to colds, sore throats, and greatly increasing the risk of bronchitis and skin diseases (according to statistics, in China, the incidence of bronchitis during winter in northern regions is significantly higher than in regions like Hainan). This, in turn, results in higher rates of sick leave and indirectly affects productivity. 2. Process Humidification ①. Electronics, Optoelectronics, and Semiconductor Factories: Humidification helps prevent static electricity caused by excessively low relative humidity. Such static electricity can lead to equipment malfunctions and increased defect rates in products. In electronics, optoelectronics, and semiconductor factories, temperatures are generally maintained at a constant level around 22°C; therefore, year-round air conditioning and precise control of temperature and humidity are essential to prevent static electricity, condensation, corrosion, fiber breakage, and discomfort among workers. When relative humidity exceeds 60%, corrosion may occur; whereas below 40%, static electricity becomes a problem. Thus, before components enter cleanrooms, they usually need to be kept in specific temperature and humidity conditions to avoid condensation due to temperature differences upon entering the cleanroom, which could cause moisture damage or generate static electricity that easily attracts dust and impurities, thereby affecting product quality and functionality. ②. Hospitals, Operating Rooms, Intensive Care Units, and Rehabilitation Facilities: Proper humidity control not only reduces unpleasant odors but also enhances patients' physical and psychological comfort and accelerates wound healing. Generally, government agencies or relevant authorities have established standards or restrictions for air-conditioning environments in different areas of hospitals, as shown in the table below for reference:

Basic Classification of Humidification

According to the humidification method, humidifiers are broadly categorized into steam humidifiers and mist humidifiers: 1. Steam Humidification: Generally speaking, the steam used in steam humidification systems is high-temperature steam, with a latent heat slightly higher than that of normal-temperature gaseous water. Therefore, after air is humidified by steam, its latent heat will increase slightly, causing the dry-bulb temperature of the space to rise by 1–2℃. Since the increase in the air’s dry-bulb temperature is relatively limited, steam humidification is also referred to as isothermal humidification. In a steam generator, liquid water is heated and vaporized into saturated steam. This steam is then directly distributed throughout the air-conditioning unit or ductwork via a steam distribution device. Subsequently, the steam fully and thoroughly mixes with the air, enabling the air to absorb moisture and thereby increasing its humidity level.

Considerations for Selecting a Humidification Method

The key considerations for selecting a humidification method are listed below: 1. Low initial installation cost; 2. Low operating costs; 3. Energy efficiency; 4. Compact equipment size with high humidification capacity; 5. Low maintenance costs; 6. Integration with existing resources—for example, using an existing boiler as a power source instead of electricity, or leveraging existing purified water systems to eliminate conventional water treatment expenses... and so forth. 7. No dripping or condensation; The primary reasons industries choose steam humidification are: 1. High steam humidification capacity, enabling attainment of relatively high relative humidity levels; 2. High absorption efficiency; 3. Complete sterilization capability; 4. Easy humidification control—constant enthalpy humidification with rapid response; 5. Simple, clean, and aesthetically pleasing exterior design... and so forth. ※ Hospitals universally opt for steam humidification, primarily because steam humidification offers complete sterilization capabilities. ※ If a control valve is used to regulate the steam flow rate, it is crucial to carefully select the appropriate valve diameter and determine the correct CV value for the valve’s throat opening. The main reasons industries choose water mist humidification are: 1. During mist humidification, the process is isenthalpic, significantly reducing room temperature and substantially lowering the energy load on ice-water machines; 2. Simple installation and easy maintenance; 3. Relatively low initial installation costs; 4. Low power consumption of the humidifier unit; 5. Safety

The three states of water

Water exists in three states: solid, liquid, and gas. In the humidification industry, the goal is to use external energy to convert liquid water into gaseous water and then, with the aid of external forces, deliver it to the space that requires humidification.

About Ren Jie

Company Profile

Guangdong Renjie Environmental Technology Co., Ltd. is a specialised provider of industrial humidification solutions, integrating research and development, design, production, sales, and service. Its predecessor, Dongguan Renjie Electronic Technology Co., Ltd., has been dedicated to the field of humidity control since its establishment in 2007.

The company focuses on innovation and application within industrial humidification technology, with a comprehensive product portfolio covering multiple humidification approaches, including:
· Electrode-type, electric-heating, and boiler-type steam humidifiers
· Liquid/steam heat exchange steam humidifiers
· Two-fluid ultrasonic spray humidification systems, two-fluid spray bottle humidification systems
· High-pressure micro-mist humidification systems, water-wash humidification systems, wet-film humidifiers, etc.

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Brand Journey

Devatek

2008.05.12: Application for Dewatek trademark

2010.06.28: Dewatek trademark registration successful

2015.08.12: Discontinuing the use of the Dewatek trademark

Renjie Jiashi

2015.12.10: Renjie Jiashi Trademark Application
2017.01.21: Renjie Jiashi trademark registration successful

2015.02.28: Renjie Trademark Application
2016.05.14: Renjie trademark registration successful

Qualifications and Honors

Add.: Nancheng District, Dongguan City, Guangdong Province, China
Te: 0086-769-22822736 / 22822946
Fax: 0086-769-22822946
Mobile phone: 0086-139-2685-9171(Mr Xue)
Email: gdrenjie@vip.163.com

Service Hotline

-0086-400-811-0868

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