For the cooling principle of most condensers: the role […]
For the cooling principle of most condensers: the role of the compressor is to compress the lower pressure steam into a higher pressure steam, so that the volume of the steam is reduced and the pressure is increased.
The compressor sucks the lower-pressure working medium vapor from the evaporator, increases the pressure, and sends it to the condenser, where it condenses into a higher-pressure liquid, which is throttled by the throttle valve, and becomes more pressure-sensitive. After the low liquid is sent to the evaporator, it absorbs heat and evaporates in the evaporator to become a steam with lower pressure, thereby completing the refrigeration cycle.
Basic principle of refrigeration system
After the liquid refrigerant absorbs the heat of the object to be cooled in the evaporator, it is vaporized into low-temperature and low-pressure steam, sucked into the compressor, compressed into high-pressure and high-temperature steam, and then discharged into the condenser. ) Exothermic, condensing into high-pressure liquid, throttling to a low-pressure low-temperature refrigerant through a throttle valve, re-entering the evaporator to absorb heat and vaporize to achieve the purpose of circulating refrigeration. In this way, the refrigerant completes a refrigeration cycle through the four basic processes of evaporation, compression, condensation, and throttling in the system.
In the refrigeration system, the evaporator, condenser, compressor and throttle are the four essential parts of the refrigeration system. Among them, the evaporator is a device that transmits cold energy. The refrigerant absorbs the heat of the object to be cooled to achieve cooling. The compressor is the heart and plays the role of sucking, compressing, and transmitting refrigerant vapor. Condenser is a device that releases heat, and transfers the heat absorbed in the evaporator to the cooling medium with the heat converted by the compressor work. The throttling valve plays a role of throttling and depressurizing the refrigerant, and simultaneously controls and adjusts the amount of the refrigerant liquid flowing into the evaporator, and divides the system into two parts: a high pressure side and a low pressure side. In the actual refrigeration system, in addition to the above four major components, there are often auxiliary equipment, such as solenoid valves, distributors, dryers, heat collectors, fusible plugs, pressure controllers and other components. They are designed to improve operation Set for economy, reliability and security.
2.The principle of vapor compression refrigeration
The single-stage vapor compression refrigeration system is composed of four basic components: a refrigeration compressor, a condenser, an evaporator, and a throttle valve. They are connected in order by pipes to form a closed system. The refrigerant continuously circulates in the system, changes in state, and exchanges heat with the outside world.
3. Main components of refrigeration system
The air conditioner can be divided into two types: water-cooled and air-cooled according to the type of condensation. It can be divided into two types: single-cooled and air-cooled. Combined.
The main components of refrigeration systems are compressors, condensers, evaporators, expansion valves (or capillary tubes, subcooling control valves), four-way valves, double valves, check valves, solenoid valves, pressure switches, fusion plugs, and output pressure regulating valves. , Pressure controller, liquid storage tank, heat exchanger, collector, filter, dryer, automatic shutter, shut-off valve, liquid injection plug and other components.
The main components of electrical systems are motors (for compressors, fans, etc.), operation switches, electromagnetic contactors, interlocking relays, overcurrent relays, thermal overcurrent relays, temperature regulators, humidity regulators, temperature switches (defrosting, prevention For freezing, etc.). Compressor crankcase heater, water cutoff relay, computer board and other components.
The control system consists of multiple control devices, which are:
Refrigerant controller: expansion valve, capillary, etc.
Refrigerant circuit controller: four-way valve, check valve, double valve, solenoid valve.
Refrigerant pressure controller: pressure switch, output pressure regulating valve, pressure controller.
Motor protector: overcurrent relay, thermal overcurrent relay, temperature relay. temperature regulator:
Temperature level regulator, temperature proportional regulator. Humidity regulator: humidity level regulator.
Defrost controller: defrost temperature switch, defrost time relay, various temperature switches.
Cooling water control: water cutoff relay, water volume regulating valve, water pump, etc.
Alarm control: over-temperature alarm, ultra-humidity alarm, under-voltage alarm, fire alarm, smoke alarm, etc.
Other controls: indoor fan speed controller, outdoor fan speed controller, etc.