The working principle of the dehumidifier and the characteristics of dehumidification and drying

Cooling dehumidifier working principle and characteristics: Cooling dehumidifier usually consists of evaporator, condenser, compressor, expansion valve, fan and casing. During normal operation, the evaporator absorbs the external heat, and the condenser emits heat outward. Under the action of the fan, the humid air is sucked from the left air inlet, and the heat is exchanged through the evaporator, and the temperature is lowered; when the humid air reaches the dew point temperature At the time, moisture is precipitated due to condensation, and the absolute moisture content of the wet air is lowered, and heat exchange occurs again when the condenser is continuously passed to raise the temperature, thereby achieving the purpose of heat preservation and dehumidification.

The cooling dehumidifier twisting requires that the dehumidification amount of the cooling dehumidifier is related to the temperature that the air is lowered after cooling the dehumidifier; and for the determined refrigeration system, the amount of the humid air temperature is reduced depending on the air volume of the air passing through the cooling dehumidifier. When the ventilation amount is too small, the evaporator temperature of the cooling humid air is too low and the surface is frosted. The frosting causes the heat exchange capacity of the evaporator heat exchange surface to decrease, the dehumidification efficiency is lowered; when the ventilation amount is too large, the evaporator temperature If it is too high, the wet air cannot be lowered to the required temperature, the amount of precipitated water is reduced, and the dehumidification efficiency is also lowered. Therefore, the amount of ventilation plays a decisive role in the amount of dehumidification of the cooling dehumidifier. In order to maintain the efficient dehumidification rate of the cooling dehumidifier, it is necessary to accurately and timely control the ventilation at the air inlet so that the surface of the evaporator maintains a relatively suitable temperature, that is, the temperature is not too high.

Characteristics of dehumidification and drying: (1) Energy saving (power saving equipment) has a remarkable effect. Compared with conventional steam drying, dehumidification drying has an energy saving rate of 40%-70%, wherein the energy saving rate of the single heat source dehumidifier is about 40%, and the energy saving rate of the dual heat source dehumidifier is about 70%. The main difference between dehumidification and conventional steam drying is that the air circulation mode of the former is basically a closed cycle. After the humid air discharged from the drying chamber is dehumidified by the dehumidification evaporator (while recovering the latent heat of vaporization), the dry hot air is sent back. The drying chamber reduces the heat loss of intake and exhaust compared with steam drying, so the energy consumption is significantly reduced. The single heat source differs from the dual heat source dehumidifying dryer in that the latter has two evaporators. The dehumidification evaporator takes heat from the humid air discharged from the drying chamber, and the heat pump fins absorb heat from the atmospheric environment, and supply hot air to the drying chamber to raise the temperature. According to the test, when the ambient temperature is above 14 ° C, the compressor consumes 1 kwh. Electricity can get more than 3 times of heat. The drying chamber using a single heat source dehumidifier is currently mainly heated by an electric heater. Therefore, the single heat source has higher energy consumption than the dual heat source dehumidifier.

(2) The drying quality is good, the wood after drying has good color (basically maintaining the original natural color), and generally does not cause drying defects such as deformation, cracking, surface hardening, etc. Therefore, the drying method is particularly suitable for drying and is easily deformed and cracked. Difficult and precious materials. Most of the export materials that require high drying quality are currently dehumidified and dried. (3) Conducive to the protection of the ecological environment. Because this kind of drying technology does not need boiler equipment, there is no fire hazard, and there is no smoke pollution. Therefore, it is especially suitable for use in areas with high environmental quality requirements.

(4) Investment province, quick effect and low operating costs. When the dry volume is the same, the total investment in the entire plant is slightly lower than steam drying. Since there is no need to build a boiler room, the drying indoor equipment is simpler than steam drying. Therefore, as long as the funds and equipment are in place, it usually takes about 4 months to start production. At the same time, due to the high degree of automation of the equipment, the operation is simple, only one person per shift, and the drying energy consumption is low, so the running cost is small. The cost of drying 1m8 wood can be reduced by an average of about 20%.