What is the drying method and working principle of the air energy dryer?

so-calledAir energy dryerIt is a new type of environmental protection and energy-saving drying equipment. Its working principle is based on the principle of reverse Carnot cycle, using a small amount of electric energy and using a compressor to work. After passing through the expansion valve, the working medium is evaporated into gas in the evaporator, and a large amount of heat energy in the air is absorbed. The gaseous working medium is compressed into high temperature and high pressure gas by the compressor, and then enters the condenser to dissipate heat (drying box).

The drying medium, which can be dried in a drying oven, is heated. In this way, the drying medium can be heated to normal temperature ~ 85 ℃. Compared with electric dryers, it can save 35-40% of electric energy and will not produce any pollution during work.

1. We use high quality grain impeller compressor. The operating cost is only 1/3 of coal-fired fuel oil and 1/4 of electric drying equipment. The whole process of automated operation and intelligent management, greatly reducing the cost of human management.

2. The control instrument of the dryer equipment adopts high-precision digital sensors, which can accurately detect temperature and humidity values. Multiple temperature ranges can be set to complete the entire baking process, and the set parameters can be modified at any time to achieve precise control.

3. The full set of equipment adopts excellent production technology in the industry. The flat sheet metal design body is treated with high temperature corrosion resistant baking varnish process. Compact structure, small footprint, beautiful appearance.

4. The heat pump dryer is a heat transfer device. Its main energy is the ambient temperature and a small amount of electrical energy. The whole equipment is equipped with circuit protection system. There is no open flame, smoke and waste residue in the drying process. It is a kind of drying equipment with low energy consumption and high efficiency.

5. The device is actually a heat lifting device. It uses the inverse Carnot principle to absorb heat from the surrounding air environment and transport it to the drying chamber to transfer it to the heating material. After the material absorbs heat and evaporates water, it is taken away by the dehumidification equipment to achieve a drying effect.

Air energy dryerThe reasons for the low thermal efficiency are as follows:

1. High heating temperature and low efficiency

Air energy dryerThe typical heating temperature is about 55°C. Because the higher the required heating temperature, the slower the temperature rise in the high temperature section, the lower the heating efficiency and energy consumption of the air energy heat pump dryer. Therefore, under the condition of meeting the operating conditions, the target water temperature should be reduced as much as possible, and the air source heat pump should be used reasonably.

2. Low fouling efficiency of condenser

If the low-temperature coolant enters the evaporator to exchange heat with the air, if the air dust is large, the evaporator dust will affectAir energy dryerThe heat transfer efficiency after long-term use, the evaporator can be cleaned with soapy water; when the water quality of tap water or groundwater is poor, the compressor produces high-temperature refrigerant to exchange heat with the condenser, the condenser coil will form scale, and the thermal conductivity will be reduced., The heat transfer efficiency will be reduced, and the heat storage in the compressor will have high-pressure protection.

3. Low temperature heating efficiency

When the operating ambient temperature of the unit is lower than 5 ℃,Air energy dryerDefrost every hour, the default frosting time is 10 minutes. Usually, a four-way valve is used to change the direction of the cooling medium. The high-temperature refrigerant produced by the compressor directly enters the evaporator for defrosting. Air energy dryers increase energy consumption by changing heating to cooling.