Industrial wet film humidification system

oneDirect drainage wet film humidifier 1. Overview-Working principle of wet film humidifier After treatment, clean tap water is evenly distributed through a water distributor and sprayed onto the wet film. The water flows downwards under the action of gravity, wetting or saturating the entire surface of the wet film. Dry air passes through the wet film, and the water on the surface of the wet film absorbs heat and evaporates into the air, achieving the purpose of humidification. This process is accompanied by a decrease in the dry bulb temperature of the air and belongs to isentropic humidification (water temperature is equal to the wet bulb temperature of the air). The humidification process does not require energy consumption. During humidification work, the water that has not evaporated can also be collected and reintroduced into the water distributor to form a circulating water humidification film. 2. Material description of wet film humidifier Wet film material is the core of humidifiers; It is a hydrophilic material that uses plant fibers as the substrate, contains slow-release antibacterial agents, and is processed and sintered with special resin components to form a corrugated board shaped cross overlapping polymer composite material. It can evenly distribute the absorbed water on the surface of the material to form a vaporization layer of water. When air flows through the surface of the material, the water in the vaporization layer evaporates and vaporizes, absorbing it into the air with strong water absorption, good self-cleaning ability, non-toxic, acid and alkali resistant, mold resistant, flame retardant, and providing a large contact surface area between water and air.

3. Characteristics of Wet Film Humidifiers

1）Self regulating moisture capacity, no condensation phenomenon
Due to the constant saturation efficiency of a certain thickness of wet film, the humidification amount can be self adjusted according to the temperature and humidity changes at the air inlet, without excessive humidification and avoiding condensation.
2）Stable operation and easy maintenance
There are few mechanical operating components, simple structure, stable operation, and easy maintenance.
3）High saturation efficiency
The humidifying medium adopts a unique design structure with a large evaporation area, which can fully contact with the air and evaporate moisture to a large extent, ensuring high saturation efficiency.
4）Clean humidification
Due to the complete vaporization of water molecules, there will be no "white powder" phenomenon, and the unevaporated water can filter and discharge dust and bacteria in the air. When using circulating water, ultraviolet disinfection lamps can be added to the circulating pipeline, or disinfectant can be added to the circulating water tank for safer and cleaner use.
5）Good cooling effect
Therefore, this humidification method is isentropic humidification, which absorbs sensible heat from the air during the evaporation of water, thus having a significant cooling effect and saving energy. For every 1 liter of water evaporated, it can obtain the equivalent cooling capacity of 7 kilograms of melted ice, but the cost is only one tenth of compression refrigeration.
6）Energy conservation and environmental protection
Due to the lack of mechanical components and the ability to recycle water, this humidification method is an energy-saving and environmentally friendly product that saves water and electricity.

1. Model of direct drainage wet film humidifier

SFMZ—mm—W×H

SFMZ: Wet Fu Direct Drainage Wet Film Humidifier

Mm: thickness of wet film material

W: Effective width of surface cooler (mm)

H: Effective height of surface cooler (mm)

5Parameters of wet film humidifier

Inorganic wet film humidification unit

GLASdek2typeCharacteristics of Wet Film Humidifier (Pure Type):

The wet film humidifier adopts GLASdek inorganic wet film material with good water absorption, long service life, and strong fire resistance

It has properties such as resistance to mold, bacteria, high temperature, and freezing.

The humidifying material can be cleaned and reused multiple times.

Humidifier materials have the ability to resist softening and deformation; Service life ≥ 5 years

Prevent water from splashing due to the airflow of the air conditioning unit, resulting in water overflow (or effective measures to prevent water overflow).

• Ensure the overall mechanical strength of the wet film humidifier and prevent the membrane from collapsing, with all frames made of stainless steel material, and require the overall mechanical strength to fully meet the air pressure requirements of the air conditioning unit;

ØConfigure automatic control and display The humidity control range in the workshop during the use of wet film is55%± 5%, humidity independently controlled. It can measure and display the relative humidity of the workshop air. ※ Water pump protection and water shortage protection.Fault alarm. ※The humidity measurement and control system includes humidity sensors, measurement and control electrical control boxes, cable signal lines, and cable trays, etc ØHaving safe hygiene measures in place Wet materials have excellent antibacterial properties or effective antibacterial measures. ØConvenient maintenance The circulating water pump is easy to maintain and install outside the air conditioning room, and the connection between the pipeline and the air conditioning must be sealed properly. ØThe humidified air has no adverse effects on the workshop. ØCirculating water tank ※The circulating water pump is located outside the air conditioning room; The water tank is made of stainless steel material with a thickness of ≥1.5mm； The water tank level is controlled by a float valve, which automatically controls the water inlet; ※The water tank is designed with automatic timed drainage,Liquid level sensorandelectricityMagnetic valve control；

2、 Circulating water wet film humidifier

1The principle of circulating water wet film humidifier Clean tap water enters the circulating water tank through the inlet pipeline, and its high water level is controlled by the inlet switch; When the humidifier is working, the circulating water pump delivers the water in the water tank to the water sprayer at the top of the humidifier. The water sprayer ensures that the water is evenly distributed to the wet film material, and the water penetrates downwards from the top of the wet film material while being absorbed by the wet film material, forming a uniform water film; When dry air passes through a humidifier, a portion of the water comes into contact with the air, vaporizes and evaporates, making the air moist (i.e. increasing humidity); The other part of the water that has not evaporated flows back to the circulating water tank from the lower part of the humidifier; The water in the circulating water tank is repeatedly circulated by the circulating water pump, thereby humidifying the air passing through the wet film. When the water level in the circulating water tank drops, the water inlet switch is turned on to replenish water to the tank, ensuring that the water level in the tank is maintained within the set height range. When the water level in the circulating water tank drops to a certain height, the low water level switch in the tank works to ensure that the circulating water pump stops running in case of water shortage. After the water in the circulating water tank circulates for a certain period of time, the water is discharged through the drainage port of the tank to clean the tank and replace the clean water, ensuring that the circulating water and humidified air are not contaminated again.

2. Model of direct drainage wet film humidifier

SFMX—mm—W×H-L/R

SFMX: Wet Fu Direct Drainage Wet Film Humidifier

Mm: thickness of wet film material

W: Effective width of surface cooler (mm)

H: Effective height of surface cooler (mm)

L/R: L left type R right type

3、Wind resistance and saturation efficiency table of wet film humidifier

4、Calculation and selection of wet film humidifier

1) Select based on humidification capacity

Formula for calculating humidification amount

W=Q · P · 1.2 · (d2-d1) (fresh air)

W=Q · P · 1.2 · fresh air ratio · (d2-d1) (partial fresh air)

In the formula: W: effective humidification capacity (kg/h)

Q: Air conditioning unit air volume m3/h

P: Air capacity 1.2 kg/m3

D1: Moisture content of air before humidification kg/kg (enthalpy and humidity chart to be checked)

D2: Humidity content of humidified air kg/kg (enthalpy and humidity chart to be checked)

1.2: Safety factor

● Example

A certain working condition: Q=15000 m3/h (fresh air) t1=40 ℃ Φ 1=15% RH before humidification

The size of the surface cooler is 1000mm × 1600mm. After humidification, t2=28 ℃ and Φ 2=50% RH

5.Calculate the humidification amount according to the formula:

W=Q·P·1.2·(d2－d1)

W＝15000×1.2×1.2×（0.012－0.007）

＝108 kg/h

According to the calculation results, the corresponding wet film thickness in the eighth quick selection table is 200mm.

After selecting the wet film thickness, the head-on wind speed should also be calculated as follows:

V=Q ÷（S×3600）=15000÷（1.6×3600）=2.6m/s

V: Facing wind speed (m/s)

S: Effective area of humidifier (m2)

Note: The head-on wind speed (V) should be ≤ 2.8m/s. If it is>2.8m/s, a water deflector should be installed.

2. Select based on saturation efficiency

Formula for calculating saturation efficiency

η: Saturation efficiency

η=（d2－d1）÷（dmax－d1）×100%

D1: Humidity before humidification * * (kg/kg)

D2: Humidity after humidification * * (kg/kg)

Dmax: saturation * * humidity (kg/kg)

● Example

The operating conditions are the same as above. Calculate the saturation efficiency according to the formula:

d2－d1

η= （d2－d1）÷（dmax－d1）×100%

=（0.012－0.007）÷（0.013－0.007）×100%

=83%

According to the calculation results, the corresponding wet film thickness in the seventh item of wind resistance and saturation efficiency table is 200mm. After selecting the wet film thickness, the head-on wind speed should also be calculated using the same method as above.

6Module structure of wet film vaporization humidifier

The production of wet film vaporization humidifiers is determined by the size of the heat exchanger area to determine the structure of the module. The module structure of a wet film humidifier is divided into:

Individual module structure; Single layer multi module structure; Multi layer and multi module structure.

Width of heat exchanger ≤ 1500mm; height ≤ 1800mm, individual module structure

Width of heat exchanger ≥ 1500mm; height ≤ 1800mm single-layer multi module structure

The width of the heat exchanger is ≥ 1500mm; the height is ≥ 1800mm, with a multi-layer and multi module structure

Double layer water tank structure with a height of ≥ 2500mm for heat exchangers

7、Precautions for the use and maintenance of wet film humidifiers

1. When using the circulating water supply method, an overflow valve is installed at the water separator. The opening amount of this valve and the water supply metering valve have been adjusted at the factory and cannot be adjusted arbitrarily, otherwise it may shorten the service life of the water pump or cause it to burn out.

2. Regularly clean the filter, water tank, and filter mesh in the water tank, especially the filter mesh in the water tank. If it gets clogged, it may cause the water pump to start frequently, resulting in a shortened or burnt life of the water pump.

3. After several years of use (usually around three years depending on the local water quality), if it is found that the humidification efficiency has decreased and the surface of the wet film has accumulated severe alkali, it can be removed and cleaned with high-pressure water, or contact the manufacturer for professional cleaning services. If using wet film of other materials, replacement may be considered. It can also be used in conjunction with water treatment equipment to extend its service life or cleaning cycle. You can contact the manufacturer to place an order.

4. It is recommended to use a circular water supply method, which can save more than 60% of water resources.

Case pictures:

8The usage conditions of wet film humidifier:

Sectional wind speed:≤2.8m/s，>2.8m/sA water blocking plate needs to be added.

Water quality: tap water or equivalent.

Water supply temperature:3－45℃

Water supply pressure:0.05－0.4Mpa

Inlet air temperature:5－60℃