working principle
For certain applications, gas must pass through a long tube (usually coiled into a solenoid) to dissipate heat into the surrounding air, and thermally conductive metals such as copper are commonly used to transport vapor. To improve the efficiency of the condenser, heat sinks are often added to the pipes to accelerate heat dissipation. The heat sink is a flat plate made of good thermal conductivity metal. This type of condenser usually requires a fan to force air through the heat sink and remove the heat. The refrigeration principle of a general refrigeration machine is that the compressor compresses low-pressure steam into high-pressure steam, reducing the volume of the steam and increasing the pressure. The compressor sucks in the lower pressure working fluid vapor from the evaporator, increases its pressure, and sends it to the condenser, where it condenses into a higher pressure liquid. After being throttled by the throttle valve, it becomes a lower pressure liquid and is sent to the evaporator, where it absorbs heat and evaporates into lower pressure vapor, thus completing the refrigeration cycle.
Foldable vapor compression type
A single-stage vapor compression refrigeration system consists of four basic components: a refrigeration compressor, a condenser, an evaporator, and a throttle valve. They are connected in sequence by pipelines to form a closed system, in which the refrigerant continuously circulates and flows, undergoes state changes, and exchanges heat with the outside world. The working process is shown in Figure 1.
Folding refrigeration system
After absorbing the heat of the cooled object in the evaporator, the liquid refrigerant vaporizes into low-temperature and low-pressure steam, is sucked in by the compressor, compressed into high-pressure and high-temperature steam, and discharged into the condenser. It releases heat to the cooling medium (water or air) in the condenser, condenses into high-pressure liquid, is throttled by the throttle valve into low-pressure and low-temperature refrigerant, and enters the evaporator again to absorb heat and vaporize, achieving the purpose of cyclic refrigeration. In this way, the refrigerant completes a refrigeration cycle in the system through four basic processes: evaporation, compression, condensation, and throttling.
Folding composition
In a refrigeration system, the evaporator, condenser, compressor, and throttle valve are the four essential components, among which the evaporator is the equipment that delivers cold. The refrigerant absorbs heat from the cooled object to achieve refrigeration. The compressor is the heart, which plays a role in inhaling, compressing, and transporting refrigerant vapor. The condenser is a device that releases heat, transferring the heat absorbed in the evaporator along with the heat converted by the compressor to the cooling medium for removal. The throttle valve has a throttling and pressure reducing effect on the refrigerant, while controlling and regulating the amount of refrigerant liquid flowing into the evaporator, and dividing the system into two parts: the high-pressure side and the low-pressure side. In actual refrigeration systems, in addition to the four major components mentioned above, there are often auxiliary equipment such as solenoid valves, distributors, dryers, collectors, fusible plugs, pressure controllers, etc., which are set up to improve the economy, reliability, and safety of operation.
