Working principle and technical requirements of air source heat pump dryer

Operational principle

(1) Compression process: Low temperature and low pressure refrigerant gas is compressed into high temperature and high pressure gas by the compressor. At this point, the work done by the compressor is converted into the internal energy of the refrigerant gas, causing an increase in temperature and pressure, which is thermodynamically called an adiabatic process.

(2) Condensation process: The high-temperature and high-pressure refrigerant gas coming out of the compressor flows through the condenser and continuously releases heat to the outside world using wind or water, condensing into a medium temperature and high-pressure refrigerant liquid. When liquefaction occurs, the temperature of the refrigerant decreases but the pressure remains constant, which is thermodynamically called equivalence

Pressure process.

(3) Throttling process: The medium temperature and high pressure refrigerant liquid coming out of the condenser is throttled by the throttling device to become a low-temperature and low-pressure refrigerant liquid. In thermodynamics, it is called an isoenthalpy process.

(4) Evaporation process: The low-temperature and low-pressure refrigerant liquid coming out of the throttling device flows through the evaporator and continuously absorbs heat into the room with wind or water, evaporating into low-temperature and low-pressure refrigerant gas. The absorbed heat becomes the latent heat of the refrigerant, although the temperature does not increase significantly,

But it can increase a lot internally. Due to the small change in pressure, it is called an isobaric process in thermodynamics.

Technical requirement

Compared to air source heat pump technology with output temperatures below 60 ℃, high-temperature heat pumps can achieve heating temperatures above 60 ℃ without changing the operating environment of the equipment, and maintain high operating efficiency and stable operating conditions. Generally, the following issues need to be addressed:

Key technology issues.

1. Selection of compressors: The commonly used types of compressors for heat pump equipment are screw compressors, fully enclosed vortex compressors, and semi enclosed piston compressors. After comparing the working characteristics of different types of compressors, it is generally found that fully enclosed compressors are used for high-temperature air source heat pump equipment

Closed vortex compressor.

2. Selection of working fluid: In order to ensure the stable and allowable working pressure of high-temperature heat pump equipment, special refrigerants are used as the working fluid, which has high heat exchange efficiency and no pollution to the environment, and no destructive effect on the ozone layer.

3. Optimization of fluorine system control: Ensure long-term high-temperature stable operation and service life of the entire unit, and automatically adjust the operating status and components of the high-temperature air heat pump equipment based on environmental temperature and evaporation temperature.