Two Fluid Ultrasonic Spray Humidification System
Isoenthalpy humidification, need to preheat air
Easy to clog, easy to maintain and low cost
Compressed air assisted atomization, fog quality is very high
True proportional output control of water mist humidification
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Water Mist Humidification
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Water Mist Humidification
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Product Detail
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Working Principle
The compressed air passes through the Venturi tube, hits the water vertically, atomizes the water into small water droplets, passes through the outlet of the nozzle at a super-high speed close to the speed of sound, and hits the ultrasonic resonance amplifier placed at the front of the nozzle in a straight line again to generate ultrasonic resonance phenomenon. The ultrasonic energy enhanced by the principle of sound wave reflection breaks the cohesion of water droplets, disperses the water droplets into more and finer micro-water droplets, and changes the micro-water droplets from granular to thin surface, increasing the contact with air hundreds of times The small area makes the micro-water droplets not only quickly but also easily absorbed by the air, so as to achieve the effect of cooling and humidifying.
If there is no ultrasonic resonant amplifier, it is generally impossible to produce a large number of micro-water droplets of 0.1-10 microns. Generally, a large number of tiny water droplets will be produced after impact, and a small part of larger water droplets will also be produced, and no matter how small the water droplets are, they are still liquid water droplets. It needs to go through smooth enthalpy conversion to turn into vaporized water. This heat energy conversion requires a certain amount of time and a certain amount of enthalpy. Therefore, it is necessary to preheat the air before humidifying to increase the heat energy that can be converted. The higher the humidity of the supply air, the longer the evaporation time and the longer the absorption distance. Therefore, it is necessary to install a water baffle at the rear of the humidifier to filter out unvaporized water and prevent condensation.
The total amount of humidification of the two-fluid ultrasonic spray humidification system is unlimited. It can be used in a large number of parallel nozzles and valve groups, and the water source pressure can also be increased to obtain higher unit water spray volume and efficiency.
Product Features
1. Water mist humidification
Also known as isenthalpic humidification, it can both humidify and cool down.
2. Ultrasonic atomizing nozzle
The special two-fluid ultrasonic atomizing nozzle made of stainless steel is not only resistant to high pressure and corrosion, but also has a long service life, and because of the specially designed front-mounted adjustable bullet-shaped ultrasonic resonator, it can effectively increase the spray quality and make the water mist particles smaller. Easier to combine with air. It also allows good atomization effects to be obtained under a wide range of gas/liquid pressure difference ratios. The front-mounted adjustable bullet-shaped ultrasonic resonator can easily adjust the distance between the nozzle outlet and the resonator, because it can easily adjust the spray diffusion range (radian) and atomization quality, so that the required humidification distance is higher than other non-adjustable Much shorter.
3. Proportional control
Through experiments and practical application, the two-fluid ultrasonic spray nozzle must have the best atomization effect, and the pressure difference between air pressure and water pressure must be controlled at about 1.0-1.5kg/cm². Therefore, a pressure difference system with a fixed pressure difference with the air pressure is specially designed no matter how the water pressure changes; and with the help of high-quality pneumatic proportional water flow control valves, pneumatic switch control valves, and special two-fluid ultrasonic spray nozzles , through complete and strict timing automatic control, the water pressure and air pressure can be controlled naturally under any circumstances to provide the best atomization effect. Therefore, among all water mist humidifiers, the two-fluid ultrasonic spray humidification system is the only water mist humidifier that can truly achieve proportional control. Due to the actual control, when the demand for water flow is small, the air flow is relatively reduced; when the demand for water flow increases, the air flow increases, thus reducing the air consumption by more than half and achieving the goal of real energy saving.
The ON-OFF control uses the full amount of compressed air regardless of the water demand. Not only the atomization effect is not good, but also a lot of compressed air is wasted, and the humidity is not easy to control stably. Because most of the "space-time environment" actually requires less humidification than the design demand, and the best atomization conditions require the two to maintain a pressure difference of 1.0-1.5KG/CM². When leaving this operating point, the result is either poor atomization effect, or waste of air energy and low efficiency.
Compressed air pressure and water pressure:
(1) When the compressed air pressure is 1.0-1.5KG/CM² higher than the water pressure, the atomization efficiency and effect are very good. In order to be able to easily control the components of this point, it is completed by a special differential pressure system.
(2) When the compressed air pressure is higher than the water pressure of 2.0KG/CM², the water volume will become less and less, or even no water flow will be sprayed out, so the efficiency is not high, and the precious compressed air energy will be wasted and the cost will be increased.
(3) The operating water pressure should be higher than 3KG/CM², and the higher the better, it is directly proportional to the use efficiency of compressed air. Because the higher the water pressure, the greater the water volume, but the air flow rate does not increase proportionally. After calculation, the unit air consumption is also reduced, so the efficiency is higher.
4. Almost maintenance-free
If pure water is used together with pure compressed air, the use of this product requires almost no maintenance. It is only necessary to clean and inspect it when it is restarted after a long period of non-operation, so that the humidification distribution effect can reach the best. quality.
5. The economic benefit is extremely good, which can save a lot of equipment purchase, installation, operation and maintenance related costs.
(1) Equipment purchase cost: the structure is relatively simple, and the relative cost is relatively low under the demand of large flow.
(2) Easy to install: Quick connector type connection method, installation and maintenance are quite simple. Can save considerable installation, inspection, maintenance and update costs.
(3) Reduce the load on the cooling plate (energy saving): In high-temperature and low-humidity environments, it is directly sprayed into the air for water mist humidification, which has a cooling effect of lowering the air temperature. Therefore, using it in a high-temperature and low-humidity environment can reduce the amount of cooling water used, prolong the service life of the cold plate equipment, and save a lot of related costs. Such as: ice water fee, electricity fee and extension of replacement time.
(4) Low power consumption: 220VAC/50W Compared with electric heating or electrode humidifiers, spray humidification uses much less power. Regardless of the amount of humidification, it only needs 0.05KW of electricity, so it can save considerable electricity expenses. Moreover, it uses lower voltage and load, and uses air pressure as the power control element, which is relatively safe.
(5) Operating cost: A large amount of medium-pressure compressed air is required for atomization, which is the main energy consumption.
(6) Structural difference: Compared with electric heating or electrode steam humidifier, its components are simpler, namely: control unit, low voltage, low power operation system.
Valve group: complete pneumatic control and automatic gas/liquid differential pressure control, good safety and high working efficiency. Multiple groups can be designed in parallel to provide a large amount of humidification needs and flexibility.
Two-fluid ultrasonic atomizing nozzle: the working unit that actually performs atomization
6. Strong scalability
The amount of humidification is suitable for all sizes. It can be used for large-scale industrial central air conditioners or direct humidification in large spaces, from 8kg/hr to infinity. Because the nozzles and valve groups are controlled in parallel, it can be increased without limit.
7. Automatic cleaning function
Automatic cleaning function at startup or shutdown: when the startup or stop signal is activated, the residual water in the pipeline will be automatically removed and the nozzle will be cleaned, so that scale is not easy to accumulate in the pipeline or bacteria will grow, and at the same time, the service efficiency and life of the nozzle will be improved. . (See Timing Control Diagram)
8. Microprocessor controller with LCD display and modifiable program, which can be changed according to different environmental conditions. There is no matching problem, and it can be compatible with the central control room system of the building, accepting 2-10V or 4-20mA signals, which is convenient for centralized control and management.
9. An external wind speed safety protection switch can be added: if the air volume is not enough, the water mist cannot be fully combined with the air and condensation will occur, which will affect the quality of humidification. Therefore, when the device senses that the wind speed is lower than the set lower limit, it will automatically turn off the humidification action to prevent the air conditioning box or air duct from causing harm due to excessive humidification. Employees, shortened service life of machinery and equipment, etc. . . .
Scope of Application
Since the two-fluid ultrasonic spray humidification system is water mist humidification, it belongs to isenthalpic humidification. According to the atmospheric graph, when the water mist humidification is performed, the dry bulb humidity will drop rapidly, so it is most suitable to use the two-fluid ultrasonic spray humidification system under the external air conditions of high temperature and low humidity, which can not only increase the relative humidity in the air , It can lower the temperature, save a lot of heat load or power consumption of the chiller and obtain a comfortable working environment. Therefore, the two-fluid ultrasonic spray humidification system is very suitable for low-temperature and high-humidity chemical fiber spinning factory area, low-temperature refrigerated fruit and vegetable preservation, high-temperature and high-humidity tropical rainforest experimental field, constant temperature and humidity semiconductor or clean room, low temperature and high humidity Wet art preservation... etc. need humidification environment. Others such as artistic landscaping, artificial snow... etc. are all special occasions where the two-fluid ultrasonic spray humidification system can be applied.
Humidification Method
High temperature and high humidity in summer, the two-fluid ultrasonic spray humidification system can be used to greatly reduce the temperature, or the air conditioner can be used to cool the air to reduce the temperature, so as to improve the living comfort and work quality of personnel. However, when the air conditioning cooling air is used for a long time to lower the temperature, the relative humidity in the indoor air is also reduced incidentally, such as in hospitals or offices, causing personnel to drink more water or directly dip or apply water on their lips and skin to prevent air pollution. Cracked or dehydrated. In winter, there may be a climate of low temperature and low humidity, especially when the cold high pressure goes south, it will bring dry and cold air. At this time, air conditioning requires air humidification. In engineering applications, when using the two-fluid ultrasonic spray humidification system in winter, the outside air needs to be preheated to 26-35ºC or higher, and then heated again after water mist humidification before being sent into the clean room to achieve clean room Constant temperature and humidity requirements. For the program description of air humidification in winter, please refer to the following attached "Humidification Program Table" and "Water Mist Humidification in the Atmosphere Curve"
| Humidification Schedule | illustrate |
| 5ºCDB，50%RH | 1. Assuming outside air conditions |
| ↓ Air preheating 26～35ºC | 2. Increase the dry bulb temperature of the air, increase the enthalpy of the air, and reduce the relative humidity of the air, but the moisture content of the air remains unchanged. |
| ↓ Water mist humidification 14.5ºC, 72%RH | 3. Distribute the micro-atomized water droplets produced by the water mist humidifier directly in the air for humidification. Water molecules absorb a large amount of latent enthalpy and vaporize, and then completely mix with air, thus increasing the moisture content of the air, but the air temperature is greatly reduced. |
| ↓ Reheated air sent to clean room Clean room design condition 22ºC 45%RH | 4. Heat the air with low temperature and high humidity again to reach the set temperature for constant temperature control. |
Design Example
1. Design conditions
| Air volume | 100，000CMH |
| Assuming outside air conditions | 5ºCDB,50%RH |
| Clean room design conditions | 22ºC，45%RH |
| Air conditioning box size | 3000mm(w)×3800(h) |
| air velocity | 2.5m/sec |
2. Calculate the amount of humidification
| Moisture content of outside air | 5ºC，50%RH=0.00270kg/kg DA |
| Moisture content of clean room air | 22ºC，45%RH=0.00742 kg/kg AD |
| air moisture difference | =0.00742-0.00270=0.00472 kg/kg DA |
| air volume | =100.000m³/HR÷[(0.79+0.85)÷2]m³kg/DA=121.951kg/hr AD |
| Humidification | =121.951kg/hr DA×0.00472kg/hr DA=575.6kg/hr |
3. Design of two-fluid ultrasonic spray humidification system
| Clean room design conditions | 22ºC, 45%RH air moisture content is about the same as 73.79%RH, 14.13ºC DB (as shown in point 3) |
| External air preheating and water mist humidification |
Outside air at 5ºC DB and 50%RH (as shown in point 1 in the diagram) The outside air is first preheated to 26ºC DB (as shown in point 2 in the figure) Water mist humidification increases the moisture content to 73.79%RH, 14.13ºC DB (as shown in point 3 in the figure) |
| After air humidification |
The second heating is sent to the clean room, and the air dry bulb temperature rises to 22ºC DB, The relative humidity drops to 45%RH (as shown in point 4) |
4. Product selection
(1) Nozzle demand: According to the air pressure and water pressure, the amount of sprayed water is used as the divisor, and then the calculated humidification demand is divided by the "divisor" to obtain the required number of nozzles.
(2) Nozzle demand = humidification demand ÷ unit nozzle humidification = 575.6kg/hr÷8kg/nozzle=72 nozzles.
(3) Demand for valve group: In order to achieve better atomization effect, one valve group can match up to 20 nozzles.
(4) Valve group demand = nozzle demand ÷ 20 / valve group = 72 ÷ 20 = 4 valve groups (less than 20 nozzles, with 1 valve group)
(5) Selection
Example: UFP04072 UF means ultrasonic spray humidification system P means proportional control 04 means valve group quantity 072 means nozzle demand
(6) Make-up water demand: Calculated from the total amount of nozzles and their humidification capacity.
Supply water requirement> 72 x8kg/hr= 576kg/hr.
(7) Supply air demand: Calculated from the total nozzle volume and its unit demand.
Assume that the air pressure is 4kg/cm² and the water pressure is 3kg/cm², check the table. Make-up air requirement > 72x80L/min= 5.76m³/min.
(8) The size of the water baffle: it is determined according to the cross-sectional area of the air conditioning box.
(9) Humidification absorption distance: the linear distance from the nozzle to the first obstacle. After the water is sprayed and atomized through the nozzle, it takes a period of time before it can absorb the sensible heat in the air and turn into water vapor and diffuse in the air. And this time is multiplied by the wind speed to get the required absorption distance. This distance has a lot to do with the humidity of the wind, that is, the higher the relative humidity, the longer the distance. If the distance is insufficient, a large amount of water mist will condense, and the humidity cannot be increased, so we have to pay attention.
(10) Nozzle installation space requirements (see installation diagram):
A. Distance between nozzles: at least 300mm parallel distance
B. Distance between nozzles and the ground (bottom of air-conditioning box): recommended minimum 600mm
C. Distance between nozzles and the top of air-conditioning box: recommended At least 400mm
, please follow the above spacing requirements to ensure the quality of humidification and prevent moisture condensation on the inner wall.
The number of nozzles is directly proportional to the amount of humidification required, and the general design of the wind speed has a basis, and the nozzles are evenly distributed in the air conditioning box, and generally a satisfactory humidification amount can be obtained.
Conditions of Use
1. Sufficient enthalpy
The two-fluid ultrasonic spray humidification system is a kind of water mist humidification, which belongs to isenthalpic humidification and needs sufficient heat enthalpy. See instructions for humidification programs above.
2. Water supply
Water quality: deionized water (pure water) or municipal tap water; using pure water, the equipment is almost maintenance-free.
Water temperature: 4~40ºC
Water pressure: The operating pressure is required to be greater than 3bar, the higher the water pressure, the better.
Water volume: Make-up water demand = number of nozzles × humidification capacity of each nozzle (8kg/hr/nozzle); in actual use, pipeline pressure loss should be considered.
3. Gas supply
Filtration grade: 5 microns
Air pressure: the operating pressure requirement is greater than 4bar
Air volume: supply air demand = number of nozzles × air consumption of each nozzle 80 liters/minute (assuming air pressure is 4kg/cm², water pressure is 3kg/cm²)
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