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Working principle of heat pump dryer

Views: 206     Author: Hedy     Publish Time: 2023-07-24      Origin: Site


Working principle of heat pump dryer

The heat pump dryer will utilize the reverse Carnot principle to collect air heat, send it to the drying chamber, and then raise the temperature there using the heat pump host. The heat pump dryer is made up of a compressor, heat exchanger (internal machine), throttle, and heat absorber (external machine).A circulating system is made up of a compressor and other components.

The heating mechanism of the heat pump dryer system is as follows: A high-temperature heat pump outside rotates through heating the drying chamber while our items are dried. When the temperature in the drying machine room goes below our specified level, the heat pump host adjacent to it will switch on automatically to heat the area.

Dehumidification process: The heat pump dryer's automatic dehumidification technique is temperature-based. When the drying chamber's environment reaches the predetermined temperature of 60 degrees Celsius and humidity level of 80% At that moment, the dehumidifying fan will activate automatically, and the airflow from the heat pump drying chamber will convey the water vapor drawn by the exhaust fan into the drain. If the drying room's ambient temperature and humidity fall below the specified values, the exhaust fan will activate automatically.

Cold air recovery: When the heat pump host is turned on, it will expel cold air. The temperature is usually 5-10 degrees Celsius cooler than average.

Then the cold air will be introduced into the production workshop to cool down for use.

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

1.Reduced heating temperature

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, the heating temperature of air source heat pump units is generally around 55 degrees. As a result, if the circumstances of usage are met, strive to reduce the goal water temperature as much as possible and use the air source heat pump intelligently.

2.Condenser fouling efficiency is low.

To heat the air, low-temperature refrigerant is introduced into the evaporator. The efficiency of If the air is dusty, the heat exchange in the air source heat pump unit will be influenced by dust in the evaporator after continuous use. Soap water can be used to clean the evaporator if the quality of the tap water or underground water is inadequate. When the produced high-temperature refrigerant exchanges heat with the condenser, the condenser coil becomes fouled, the thermal conductivity decreases, the efficiency of the heat exchange decreases, and the accumulation of heat in the compressor results in high-pressure protection.

3.Insufficient heating efficiency at low temperatures

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.

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   Samuel Ou
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