What are the three principles of refrigeration, and the basic principles of refrigeration

1. Definitions. Refrigeration: The process of drawing heat from an object below the environment and transferring it to an ambient medium.

Chiller: A general term for the machinery and equipment necessary to complete the refrigeration cycle. Refrigeration unit:

A device that combines a chiller with a facility that uses cooling capacity. Such as refrigerators, air conditioners, etc. Refrigerant:

In addition to semiconductor refrigeration, refrigerators rely on the internal circulating flow of the working medium to achieve the refrigeration process, and the working medium that completes this function is called refrigerant, also known as refrigeration working fluid.

2. The basic principle of refrigeration.

Since heat can only be transferred automatically from a hot object to a cold object, the realization of cooling must include a compensating process for energy consumption. The basic principle of the refrigerator: the state change of a certain working fluid, absorb a certain amount of heat Q0 from the heat source at a lower temperature, and release heat Qk to the heat source at a higher temperature through a compensation process that consumes power W.

In this process, the conservation of energy yields qk= q0 + w.

3. The basic method of refrigeration.

In order to achieve energy transfer, there must first be a process that enables the refrigerant to reach a lower temperature than the low-temperature ambient medium, and continuously draws heat from the cooled object

Phase change refrigeration: The process of evaporation of liquids at low temperatures or the melting or sublimation of solids at low temperatures is used to absorb heat from the cooled object. Ordinary air conditioners are all refrigeration methods in this way.

Gas expansion refrigeration: The high-pressure gas can reach a lower temperature after adiabatic expansion, so that the low-pressure gas can be reheated to be refrigerated. Gas vortex refrigeration:

The high-pressure gas can be separated into two streams of hot and cold air after the expansion of the vortex tube, and the reheating process of the cold air stream can be used to refrigerate. Thermoelectric refrigeration: By passing direct current through a semiconductor thermopile, it produces a cooling effect at one end and a thermal effect at the other.

4. Single-stage compressed steam refrigeration cycle.

The vapor compression refrigerator is the most widely used refrigerator at present, and it is divided into single-stage, multi-stage and cascade.

A single-stage compressed steam chiller refers to a refrigerator that compresses the refrigerant from evaporation pressure to condensing pressure through a primary compression. Single-stage chillers can generally be used to produce low temperatures above -40.

The principle of refrigeration is to use the safe display cabinet cooling water to flow from the top of the main condenser, and the mixed steam is condensed after being sprayed with cooling water, and discharged into the pool from the bottom together with the cooling water. The uncondensed steam and air accumulated in the main condenser are extracted by the first auxiliary ejector, and after the condensation of the first auxiliary cold exchanger, then the condensation is directly discharged into the atmosphere after being sucked and condensed by the second auxiliary ejector and the second auxiliary condenser.

The single-stage vapor compression refrigeration system is composed of four basic components: refrigeration compressor, condenser, throttle valve and evaporator. They are connected by pipes to form a closed system, in which the refrigerant is constantly circulating, changing its state, and exchanging heat with the outside world. After absorbing the heat of the cooled object in the evaporator, the liquid refrigerant is vaporized into low-temperature and low-pressure steam, which is sucked in by the compressor and compressed into high-pressure and high-temperature.

The principle of refrigeration is divided into two parts:1The binary solution is heated and boiled by a heat source in the generator, and the resulting refrigerant vapor is condensed into a refrigerant liquid in the condenser.

The liquid refrigerant enters the evaporator after being throttled through the U-shaped tube, and is ejected by the evaporator at a low disturbance pressure. The liquid refrigerant evaporates and absorbs the heat of the refrigerant, creating a refrigeration effect. 2.

The concentrate flowing out of the generator is cooled and depressurized by the heat exchanger and then flows into the absorber, where it mixes with the original solution of the absorber to form a medium concentration concentrate. The medium-concentrated solution is delivered and sprayed by an absorption pump, and the refrigerant vapor from the evaporator is absorbed into a dilute solution. The dilute solution is delivered to the generator by the generator pump, and the refrigerant vapor generated by the heat source forms a concentrated solution again and enters the next cycle.

To sum up, any refrigeration equipment is composed of four parts (compressor, condenser, evaporator, throttling device), and the refrigerant absorbs or releases heat through the change of physical state in the refrigerator to achieve the effect of cooling or heating. Related information: that is, air conditioning, regulating temperature and humidity.

A suspended air conditioner is a unit used to provide a spatial area (usually enclosed) with the ability to handle changes in air temperature. Its role is to regulate the temperature, humidity, cleanliness and wind of the air in the room (or enclosed space or area).

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The working principle of the refrigerator The working principle of the refrigerator. I believe that everyone is no stranger to refrigerators, and many refrigeration machines are made according to the working principle of refrigerators. Next, I will take you to understand the working principle of the refrigerator in detail.

The working principle of the refrigerator 1 In the circulation system of the refrigerator, the compressor sucks the refrigerant vapor at low temperature and low pressure from the evaporator, compresses it into superheated steam at high temperature and high pressure through the compressor adiabatic compression, and then presses it into the condenser for constant pressure cooling, and releases heat to the cooling medium, and then cools it into a supercooled liquid refrigerant. The liquid refrigerant becomes a low-pressure liquid refrigerant through the expansion valve adiabatic throttling, which evaporates and absorbs the heat in the circulating water (air) of the air conditioner in the evaporator, so as to cool the air conditioning circulating water to achieve the purpose of refrigeration, and the low-pressure refrigerant flowing out is sucked into the compressor, so that the cycle works. The circular structure of the refrigerator is composed of a compressor, a condenser, an evaporator, and a throttling device.

Compressors are used to compress refrigerant vapor from low pressure to high pressure; The condenser cools the superheated vapor of the refrigerant discharged from the compressor and condenses into a refrigerant liquid, where the heat of the refrigerant is discharged to the cooling medium. Precautions for refrigerators: 1. The closer the cold storage compressor is to the evaporator, the better, mainly easy to maintain, and dispersed.

What is the refrigeration principle of an air conditioner? Hello! Principle of air conditioning and refrigerationAfter the air conditioner is energized, the low-pressure steam of the refrigerant in the refrigeration system is sucked into the compressor, compressed into high-pressure steam, and then enters the condenser.

At the same time, the outdoor air drawn in by the axial fan flows through the condenser, taking away the heat released by the refrigerant, and condensing the high-pressure refrigerant vapor into a high-pressure liquid. The high-pressure liquid is sprayed into the evaporator after passing through the filter and throttling mechanism, and evaporates at the corresponding low pressure, absorbing the surrounding heat. At the same time, the cross-flow fan continuously feeds the air into the evaporator fins for heat exchange, and sends the exothermic cold air to the room.

In this way, the indoor air is constantly circulating to lower the temperature. Heat pump heating works by using a refrigeration system to compress a condenser to heat the indoor air. During air conditioning refrigeration, the low-pressure refrigerant liquid evaporates in the evaporator to absorb heat, and the high-temperature cavity destroys the high-pressure refrigerant to release heat and condense in the condenser.

Heat pump heating is to reversing the position of the suction pipe of the refrigeration system through electromagnetic commutation. The indoor coil of the original refrigeration evaporator becomes the condenser for heating, so that the refrigeration system absorbs heat into the indoor and outdoor areas to achieve the purpose of heating. What is the principle of air conditioning refrigeration?

The principle of a home air conditioner is the second law of thermodynamics. It changes the refrigerant by consuming mechanical energy.

After the air conditioner is energized, the low-pressure steam of the refrigerant in the refrigeration system is sucked in by the pressure shortage first shrinker and compressed into high-pressure steam and discharged to the condenser. At the same time, the outdoor air drawn in by the axial fan flows through the condenser, taking away the heat released by the refrigerant, causing the high-pressure refrigerant vapor to condense into a high-pressure liquid. The high-pressure liquid is sprayed 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 continuously enters the ribs of the evaporator for heat exchange, and sends the cooled air after exothermic contact to the room. In this way, the indoor air is constantly circulating and flowing to achieve the purpose of reducing the temperature. Extended Resources:

Air conditioner is an air conditioner that regulates temperature and humidity, and a hanging air conditioner is a unit used to provide a space area (generally closed) to deal with changes in air temperature. Its function is to adjust the temperature, humidity, cleanliness and air velocity of the air in the room (or enclosed space or area) to meet the requirements of human comfort or process. In the design and manufacture of air conditioners, it is generally allowed to control the temperature between 16 and 32.

If the temperature is set too low, on the one hand, it will increase unnecessary power consumption, and on the other hand, when the temperature difference between indoor and outdoor is too large, people can not quickly adapt to the temperature change when entering and leaving the room.

First of all, liquid vaporization requires endothermy, and gas liquefaction requires exothermia. The compressor sends the freon liquefaction into the internal machine for vaporization, and then liquefies the gas freon in the external machine, and the liquid freon enters the evaporator (indoor unit) through the capillary, and the space suddenly increases and the pressure decreases.

The liquid freon will vaporize and become gaseous low-temperature freon, thereby absorbing a large amount of heat, the evaporator will become cold, and the fan of the indoor unit will blow the indoor air through the evaporator, so the indoor unit will blow out cold air. The gaseous freon will return to the rolling machine to continue compressing and circulate, and the freon can be recycled.

Extended Information: Chemical properties of Freon.

1. Different freon refrigerants have different properties, and their flammability and toxicity are related to the number of chlorine, fluorine and hydrogen atoms in the molecule.

2. Toxicity: low toxicity, or non-toxicity. If R12 is low toxicity, it can be considered as a basically non-toxic compound. The number of chlorine atoms increases, and the toxicity increases; The number of fluorine atoms increases, and the toxicity decreases.

3. Flammability: The large number of hydrogen atoms in the molecule decreases, the flammability decreases, and the chemical stability increases.

4. Stability: The number of hydrogen, chlorine and fluorine atoms increases, and the chemical stability of the working fluid is enhanced. The number of chlorine atoms increases, the lifetime of the working fluid in the atmosphere increases, and the ability to destroy the ozone layer is enhanced.

Now that the weather is getting hotter and hotter, I believe that many people will turn on the air conditioner, and in the summer they use the air conditioner to refrigerate, which can bring us a cool and comfortable environment, so do you understand the principle of air conditioning refrigeration? After understanding, we are able to make better use of air conditioning for cooling.

1. What is the principle of air conditioning and refrigeration?

When we turn on the air conditioner in summer, we only need to adjust to the refrigeration mode, and it can pass the refrigerant at low temperature and low pressure, and then suck it into its cylinder, and then run through the compressor to increase the pressure. When it is greater than the pressure in the condenser, it can be converted into cold air, and in the whole refrigeration system, it will go through four steps, which are compression, condensation, expansion and evaporation, and it is a cycle, so that the cold air can be continuously blown out of the air conditioner.

Second, the four major devices that affect air conditioning and refrigeration.

Because the air conditioner needs to go through four steps in the refrigeration process, there are four major components that need to be understood.

1. The first one is the evaporator, which is an important component in the refrigeration system. Through the evaporator, it can circulate heat with the outdoor air, so that the hot air can be sucked away to achieve the effect of refrigeration.

2. The compressor is also an important refrigeration tool, which is equivalent to the human heart, which can add enough power in the refrigeration system cycle, it can absorb the low-pressure gas brought by the evaporator, and then compress it to discharge the high-temperature and high-pressure gas to continuously provide the power of the cold cycle. There are also different types of compressors, such as one that is piston.

3. There is also a condenser, which is a kind of switch device that is cooled, compressed by a compressor, and then converted into liquefaction, which also plays a relatively large role.

4. Sometimes we find that the refrigeration effect is not particularly good, and it is also related to its throttle valve. The throttle valve plays a large role, when the liquid is cooled, it will pass through the evaporation temperature, and at the same time can adjust the flow into the room, so as to play a role in regulating the temperature.

The reason why the air conditioner can be refrigerated is that it can achieve the refrigeration effect through a series of cycles, and each step is very critical, otherwise the refrigeration effect will not be good. And when the refrigeration is found to be bad, it is necessary to check whether these four major devices have failed.

The liquid freon enters the evaporator (indoor unit) through the capillary, the space suddenly increases, the pressure decreases, and the liquid freon will vaporize, (from liquid to gaseous state is an endothermic process), absorb a large amount of heat, the evaporator will become cold, and the fan of the indoor unit will blow the indoor air through the evaporator, so the indoor unit blows out of the cold air; Then the gaseous freon returns to the compressor to continue compressing and continuing the cycle. The concentrated solution flowing out of the generator is cooled and depressurized by the heat exchanger and then flows into the absorber, and is mixed with the original solution of the absorber to become a concentrated solution of intermediate concentration. The intermediate concentration solution is conveyed by the absorber pump and sprayed, absorbing the refrigerant vapor from the evaporator into a dilute solution.

The dilute solution is pumped from the generator to the generator, where it is regenerated by the heat source to form a concentrated solution again and enter the next cycle. The binary solution is heated and boiled by a heat source in the generator, producing refrigerant vapor which is condensed into a refrigerant liquid in the condenser.