The heating and cooling principle is the same, that is, the inverse Carnot cycle. The difference from the refrigeration principle is the exchange of the condenser and the evaporator, namely: compressor-evaporator-throttle-condenser.
Compressor is the heart of the refrigeration system. Whether it is air conditioning, cold storage, chemical refrigeration process, etc., there must be an important part of the compressor to protect!
There are many types and forms of refrigeration compressors. According to the principle, there are two types of volumetric compressors: volumetric type and speed type. Volumetric type is the most common type.
How does the compressor compress the gas?
Simply put, the gas compression and delivery process is completed by changing the volume of the gas! Any power equipment needs to have a motive force to complete the work, and the compressor is the same. It needs an electric motor (motor) to drive.
The volumetric compressor is divided into two types: reciprocating piston type and rotary type.
1. The reciprocating piston type changes the gas working volume by reciprocating the piston in the cylinder; the piston compressor has a long history and mature production technology.
2. Rotary compressors include blade (slider) rotary compressors and screw compressors. Most of the air conditioners produced in China currently use rotary compressors; screw compressors are mainly used for large-scale refrigeration equipment.
The refrigeration system is mainly divided into several devices:
The basic principle is that the compressor compresses the refrigerant into a high-pressure saturated gas (ammonia or Freon), which is then condensed by a condenser.
After throttling by the throttling device, it is passed to the evaporator, and the medium to be cooled is cooled and exchanged. For example, connecting the evaporator to each room in the building, the serpentine tube in the evaporator will exchange heat with the air, and then the cold air will be blown into the air of the room by the blast.
The refrigerant in the evaporator serpentine tube heats up and becomes a low-pressure vapor back to the compressor, which is then compressed by the compressor, so that the refrigeration system is completed by recycling.
The heating system is also roughly the same, but the opposite is true.