The working principle of the air-to-air heat exchange dehumidifier: The Nesda air-to-air heat exchange dehumidifier is a device that dehumidifies the air based on the principle of freezing and dehumidification. It uses a compression refrigeration system to forcibly cool the air entering the dehumidifier, so that a large amount of water vapor is condensed into liquid droplets, which are separated by a special gas-liquid separator and discharged, and the dew point of the finished product gas can reach 5-15°C.
Its working process: the high temperature and high humidity air first enters the inlet and outlet heat exchanger for pre-cooling, and is cooled by the outlet cold air, so that the inlet air is cooled to about 24-28°C, and some moisture is removed. The pre-cooled humid air enters again. The evaporator enters forced cooling to reduce the temperature of the humid air to about 5-15°C, and most of the water is removed through a special separator. At this time, the water content in the air is very small, about 8-11g/m³. The dehumidified air is preheated by the inlet and outlet heat exchanger → condensing heat intensifier. At this time, the temperature is about 27℃ and the relative humidity is 40%, which becomes the dry product gas. Under extreme conditions, the entire dehumidification process can remove more than 73% of the moisture.
Products used: Air-to-air heat exchange dehumidification unit
Dehumidification air volume: 45000m³/h
Number of units: 2
Dehumidification process: fresh air cooling and dehumidification
Product features: large air volume, high efficiency, super energy saving
Air supply status: 18-28℃, moisture content 8-12g/kg
Application site: high-tower compound fertilizer production line
Equipment performance characteristics:
a. It has a unique pre-cooler: It is made of corrosion-resistant stainless steel, which exchanges heat between hot and humid air and cold and dry air at the outlet of the evaporator, which can not only recover a large amount of cold capacity, reduce the energy consumption of the refrigeration compressor, but also prevent Condensation in the outlet pipe affects the service life.
b. Adopting screw refrigerant compressor: It has high refrigeration efficiency, stable operation, wide range of use, and its operating life is more than 50,000 hours under standard conditions.
c. Adopt continuous stepless capacity adjustment system: Taking the evaporation temperature as the control standard, it can be continuously controlled between 25%-100% of the refrigeration capacity to achieve the function of stable output; it not only has a constant evaporation temperature, but also ensures the dehumidification effect. And it can save a lot of electric energy; it not only has the function of frequency conversion speed regulation and constant temperature, but also can avoid the adverse effect of the use of frequency conversion system on the cooling compressor heat dissipation at low frequencies.
d. Efficient evaporator: The evaporator uses high-efficiency copper tubes with aluminum finned tube clusters with spoiler holes to improve heat exchange efficiency and promote the formation of water droplets. At the same time, to prevent water droplets from adhering to the fins, the fins are hydrophobic The heat exchange area of the evaporator is increased by 25% compared to the normal area. Such a large area of the evaporator can reduce the temperature difference during heat exchange, reduce the gas dew point temperature, and reduce the water content of the air.
e. High-efficiency gas-water separation device: The domestic exclusive use of the separation principle of decelerating condensation and diversion acceleration increases the separation efficiency of the gas-water separator from 60%-70% to more than 99%, thereby ensuring a lower content of the product air The amount of water.
f. Unique condensation heat warmer: Use condensation heat to heat up the air, rationally use condensation waste heat, no need for steam and electric heating devices, and save a lot of energy.
g. High-efficiency water condenser: The water condenser is one of the main heat exchangers of the air dehumidifier. The heat exchange medium is cooling water and high-temperature gas refrigerant. Due to the use of high-efficiency copper pipes, it is stable and reliable; the water condenser is equipped with sewage One valve is convenient to prevent freezing and release water in winter.
h. Man-machine interface system: adopts Taiwan Weilun large-screen color touch screen operation interface, with high degree of automatic control and simple operation.
i. Anti-corrosion treatment process: the box body is sprayed with plastic inside and outside for anti-corrosion, the steel parts are anti-corrosive with polyurethane paint, and the paint layer adopts two primers, one intermediate paint and two top coats.
j. Electrical system: use brand-name electrical components; the electrical control box is separated from the host, which facilitates the cleaning and maintenance of the equipment, and can also avoid condensation on the inner wall of the electrical box when the temperature difference between the inside and outside of the box is too large. The condensation on the inner wall may cause the electrical box The electrical components inside were damp and burned out.
k. Integral design: The refrigeration system and the air heat exchange system are designed as an integral type, with a small footprint; before leaving the factory, the internal piping system of the equipment is all connected, the equipment outlet reserved air pipe and the inlet and outlet cooling water pipe flange interface It is very convenient and saves the installation cycle.
l. Adopt direct evaporative cooling and dehumidification: that is, the air directly exchanges heat with the refrigerant through the heat exchange tube; compared with the split design of the traditional refrigeration system and the air heat exchange and dehumidification system, the heat exchange efficiency is greatly improved; that is, the traditional The large-scale refrigerated dehumidifier of the first is that the chiller cools the water into chilled water, and then the chilled water exchanges heat with the air, which will cause a loss of cooling, and will also increase chilled water pumps, chilled water regulating valves and other equipment.
m. Energy-saving system: The above-mentioned unique air pre-cooling and pre-heating device (import and export heat exchanger) and condensation heat heating device are used, and the cooling capacity and heat recovery are rationally used. It saves more than 30% of energy compared with traditional refrigeration dehumidification and dehumidification devices. Compared with the rotary refrigeration combined dehumidification device, it has more energy-saving advantages and conforms to the national energy-saving and emission-reduction policy.
The above is the principle and application of the air-to-air heat exchange dehumidification unit. I hope it can help you understand better. For more information, please feel free to contact us.
