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Working principle of heat pump dryer

Views: 230     Author: Wendy     Publish Time: 2023-05-19      Origin: Site

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Working principle of heat pump dryer

The reverse Carnot principle will be used by the heat pump dryer to collect atmospheric heat, transmit it to the drying chamber, and then raise the temperature there using the heat pump host. Compressor, heat exchanger (internal machine), throttle, and heat absorber (external machine) make up the heat pump dryer.compressor and more components make into a circulating system.

The heat pump dryer system's heating mechanism: As our products are being dried, a high-temperature heat pump outside cycles through heating the drying chamber. When the temperature in the drying machine room falls below our predetermined temperature, the heat pump host next to it will automatically turn on to heat the space. The heat pump host will also cease functioning when the temperature in the drying room exceeds our pre-set value.

Process of dehumidification: The heat pump dryer's automated dehumidification technology is based on temperature. When the atmosphere of the drying chamber achieves the predefined temperature of 60 degrees Celsius and humidity level of 80% At that point, the dehumidifying fan will automatically come on, and the airflow from the heat pump drying room will also carry the water vapor pulled by the exhaust fan into the drain. The exhaust fan will automatically turn on if the drying room's ambient temperature and humidity are below the predetermined levels.

Cold air recovery: The heat pump host will discharge cold air when it is in operation. The temperature is generally 5-10 degrees Celsius lower than normal temperature. Then the cold air will be introduced into the production workshop to cool down for use.

What causes the low thermal efficiency of the air-energy heat pump drying mechanism?

1.Low heating temperature

The heating temperature of air source heat pump units is generally around 55 degrees, because the higher the heating temperature requirements, the slower the temperature rise in the high temperature section, the significant decrease in heating efficiency, and the increase in energy consumption of air source heat pump units. Therefore, in the case of meeting the conditions of use, try to lower the target water temperature as much as possible, and use the air source heat pump rationally.

2.Low condenser fouling efficiency

To heat the air, low-temperature refrigerant is introduced into the evaporator. The efficiency of the heat exchange in the air source heat pump unit will be impacted by the dust in the evaporator after prolonged usage if the air is dusty. When the quality of the tap water or subterranean water is poor, soap water can be used to clean the evaporator. The condenser coil will get fouled, the thermal conductivity will decrease, the efficiency of the heat exchange will diminish, and the buildup of heat in the compressor will result in high-pressure protection when the generated high-temperature refrigerant exchanges heat with the condenser.

3.Low heating efficiency at low temperature

When the working environment temperature of the unit is lower than 5 degrees, the air source heat pump unit will defrost once every hour. The default defrost time is 10 minutes. Generally, the four-way valve is used to change the direction of the refrigerant. The high-temperature refrigerant produced by the compressor directly enters the evaporator to defrost. , The air source heat pump unit is converted from heating to cooling, which increases power consumption.