Generally speaking, the refrigerator has the following nine refrigeration principles: 1) compression refrigerator: this refrigerator is provided with mechanical energy by the motor and works on the refrigeration system through the compressor. The refrigeration system is based on the principle that the low boiling point refrigerant absorbs the heat of vaporization when it evaporates. Its advantages are long service life and convenient use. At present, 9 1~95% refrigerators in the world belong to this category. 2) absorption refrigerator: this refrigerator can use heat sources (such as gas, kerosene, electricity, etc.). ) as power, and the ammonia-water-hydrogen mixed solution is used to achieve the purpose of refrigeration in the process of continuous absorption-diffusion. Its disadvantages are low efficiency and slow cooling, which has been gradually eliminated. 3) Semiconductor refrigerator: a refrigerator that realizes refrigeration based on the principle of Peltier effect produced by nodes. 4) Chemical refrigerator: Some chemicals absorb heat strongly when dissolved in water to obtain refrigeration effect. 5) Electromagnetic vibration refrigerator: the compressor is driven by electromagnetic vibration machine as the main power. Its principle and structure are basically the same as that of the compression refrigerator. 6) Solar refrigerator: solar energy is used as refrigeration energy. 7) Thermal insulation demagnetization refrigerator. 8).
Working principle and schematic diagram of refrigerator refrigeration system
Principle:
Refrigerator refrigeration system belongs to vapor compression refrigeration system, and its typical structure consists of compressor, condenser, drying filter, capillary tube, evaporator and connecting pipeline.
(1) The dry saturated steam of the low-temperature and low-pressure refrigerant coming out of the evaporator by the compressor is adiabatically compressed by the compressor and becomes superheated steam with high temperature and high pressure.
(2) The high-temperature and high-pressure superheated steam coming out of the compressor of the condenser enters the condenser, condenses under the condition of equal pressure, and radiates heat to the surrounding environment medium to become a high-pressure supercooled liquid.
(3) Capillary high-pressure supercooled liquid is throttled by capillary isenthalpic throttling to become low-temperature and low-pressure refrigerant vapor, which enters the evaporator for evaporation.
(4) The wet vapor of the low-temperature and low-pressure refrigerant throttled by the capillary tube boils in the evaporator under the condition of constant pressure, and absorbs the heat of the surrounding medium to become dry saturated vapor of the low-temperature and low-pressure refrigerant.
What is the refrigeration principle of refrigerator?
Hello! Refrigeration principle of refrigerator: vapor compression refrigeration system consists of compressor, condenser, capillary and evaporator, which are connected into a sealed system through pipelines. The refrigerant liquid exchanges heat with the object to be cooled at low temperature in the evaporator, absorbs the heat of the object to be cooled and gasifies, and the generated low-pressure steam is sucked by the compressor, compressed and discharged at high pressure. The high-pressure gaseous refrigerant discharged from the compressor enters the condenser and is cooled by cooling water or normal temperature air. Condensed into a high-pressure liquid. When the high-pressure liquid flows through the expansion valve, it is throttled and becomes a low-pressure and low-temperature gas-liquid two-phase mixture, which enters the evaporator. The liquid refrigerant evaporates and cools in the evaporator, and the generated low-pressure steam is sucked by the compressor again, and so on. Reference picture: CBE 21/subject/physics/images/10404/65438.
Refrigeration principle of air conditioner refrigerator,
The principle of refrigeration is actually very simple, that is, the principle of using liquid to absorb heat and gas to release heat.
(Most people have been injected. When the doctor disinfected you with alcohol cotton balls, you felt cold. That's because alcohol evaporates and absorbs the heat on the surface of your skin, so you feel cool. The refrigeration principle of air-conditioned refrigerator is the same. The refrigeration system consists of: compressor-condenser-filter-shutoff (capillary tube, expansion valve)-evaporator-compressor. Air conditioning plus four-way valve for heating. In order to change the condenser and evaporator, that is, when heating, the internal machine becomes a condenser and the external machine becomes an evaporator.
If you want to know more, you'd better buy a book on refrigeration, which is more detailed Learning refrigeration can be said to be relatively easy, but much more difficult than learning to repair TV, which is the most technical in the home appliance repair industry.
Refrigeration principle of refrigerator (why refrigerator is a "porter")
Hello! At present, the refrigeration principle of common household air conditioners and refrigerators is exactly the same, which belongs to vapor compression refrigeration. The vapor compression refrigeration system consists of compressor, condenser, capillary tube and evaporator, which are connected into a sealed system through pipelines. The refrigerant liquid carries out low-temperature heat exchange with the cooled object in the evaporator, absorbs the heat of the cooled object and vaporizes it, and the generated low-pressure steam is sucked by the compressor. After being compressed, it is discharged at high pressure. The high-pressure gaseous refrigerant discharged from the compressor enters the condenser, is cooled by normal-temperature cooling water or air, and condenses into high-pressure liquid. When the high-pressure liquid flows through the expansion valve, it is throttled into a low-pressure and low-temperature gas-liquid two-phase mixture, which enters the evaporator, where the liquid refrigerant evaporates and cools, and the generated low-pressure steam is sucked again by the compressor, and so on.
The principle and process of air conditioning refrigeration?
Refrigeration principle of air conditioner: A refrigeration method that uses the phenomenon that refrigerant with extremely low boiling point (such as Freon) absorbs and releases heat during the phase change process, and achieves the purpose of reducing the temperature of the cooled object by means of the non-stop circulation process of compressor suction compression, condenser exothermic condensation, throttle valve throttling and depressurization, and evaporator endothermic vaporization. Process: After the air conditioner is electrified, the low-pressure vapor of the refrigerant in the refrigeration system is sucked by the compressor, compressed into high-pressure vapor and discharged into the condenser. At the same time, the outdoor air sucked by the axial fan flows through the condenser, taking away the heat released by the refrigerant and condensing the high-pressure refrigerant vapor into high-pressure liquid. The high-pressure liquid is injected into the evaporator after passing through the filter and throttling mechanism, and evaporates at the corresponding low pressure to absorb the surrounding heat. At the same time, the cross-flow fan makes air continuously enter the fins of the evaporator for heat exchange. The cooled air after heat release is sent into the room, so that the indoor air is continuously circulated and cooled. Composition and function of air conditioner: (1) compressors suck in refrigerants one by one to maintain the low temperature of evaporator; Compressing refrigerant to promote refrigerant circulation. (2) Condenser-Condenses high-pressure and high-temperature gaseous refrigerant into liquid state. (3) Throttle-throttle and decompress the refrigerant to reduce the evaporator temperature. (4) Evaporator —— Evaporate low-pressure and low-temperature liquid refrigerant into gas. Refrigerant: a heat transfer medium that circulates continuously in a refrigeration device and transfers heat through phase change.
Briefly describe the working process of refrigerator refrigeration.
The principle of refrigerator refrigeration is to bring the heat in the box outside the box through the working medium (Freon gas), thus reducing the temperature in the box. So how is this achieved? Combining with the first law of thermodynamics and ignoring secondary factors, let's analyze its principle. When the working medium reaches the pipeline in the box, the gas volume expands to do work outside, ignoring the role of heat transfer. According to the formula of the first law of thermodynamics, the internal energy of gas can reduce the temperature drop, and the temperature of working fluid in the pipeline is lower than that in the tank, so the heat in the tank is transferred to the working fluid in the pipeline. When the endothermic working medium reaches the pipeline outside the box, the compressor compresses the gas volume, and the outside does work on the gas, ignoring the role of heat transfer. According to the formula of the first law of thermodynamics, the internal energy of gas can increase the temperature. At this time, the temperature of the working fluid in the pipeline is higher than the external environment temperature, so the working fluid in the pipeline transfers heat to the external environment. From the above analysis, we can see that when the working medium reaches the pipeline in the cabinet, it absorbs the heat in the refrigerator, and when it reaches the pipeline outside the cabinet, it releases heat to the outside environment, thus realizing the heat from the refrigerator to the outside, that is, realizing the refrigeration of the refrigerator.