What is a primary refrigerant vs. a secondary refrigerant?

Refrigerant: (The following is a refrigerant and refrigerant are collectively referred to as refrigerant) In a refrigeration and air-conditioning system, it is used to transfer heat energy and produce a freezing effect. According to the working mode, it can be divided into primary refrigerant and secondary refrigerant.

According to the classification of material properties, it can be divided into natural (natural) refrigerant and synthetic (synthetic) refrigerant. Ideal refrigerant: non-toxic, non-corrosive, non-corrosive to metals and non-metals, non-combustion, easy to detect leakage, chemically stable, non-destructive to lubricating oil, with relatively latent heat of evaporation, harmless to the environment.

Ideal physical properties of refrigerant 1The evaporation pressure should be high The evaporation temperature will change with the application temperature, for example, the evaporation temperature of the chiller is about 0 5, the evaporation temperature of the freezer host is about -20 30, and the evaporation temperature of the household air conditioner is about 5 10. If the evaporation pressure of the refrigerant is lower than the atmospheric pressure, the air is easy to enter the system, and the system is more difficult to treat, so it is hoped that the evaporation pressure of the refrigerant can be higher than the atmospheric pressure when the refrigerant evaporates at low temperature.

2.The latent heat of evaporation should be large The latent heat of evaporation of the refrigerant is large, which means that a large amount of heat can be absorbed by using less refrigerant. 3.

The critical temperature should be high The critical temperature is high, which means that the condensation temperature of the refrigerant is high, and the air or water at room temperature can be used to cool the refrigerant to achieve the effect of condensation and liquefaction. 4.The condensing pressure should be low The condensing pressure is low, which means that the refrigerant can be liquefied at a lower pressure, and the compression ratio of the compressor is small, which can save the horsepower of the compressor.

5.The solidification temperature should be low The freezing point of the refrigerant should be low, otherwise the refrigerant will freeze in the evaporator and cannot be circulated. 6.

The specific volume of gaseous refrigerant is smaller The smaller the specific volume of gaseous refrigerant, the better, the volume of the compressor can be reduced to reduce the cost, and the suction pipe and exhaust pipe can be piped. 7.The higher the density of the liquid refrigerant, the smaller the piping can be used for the liquid pipe.

8.Soluble in refrigeration oil, the system does not need to be fitted with oil separator Ideal refrigerant chemistry 1Chemically stable evaporation temperature will change with the application temperature, for example, the evaporation temperature of the water chiller is about 0 5, cold in the refrigeration circulation system, the refrigerant only has physical changes, but no chemical changes, no decomposition.

2.Non-corrosive It is non-corrosive to steel and metal, and ammonia is corrosive to copper, so copper pipe piping should not be used in ammonia refrigeration system; The insulation should be good, otherwise the insulation of the compressor motor will be damaged, so ammonia should not be used in closed compressors, so as not to be in direct contact with the copper coil. 3.

No environmental pollution, harmless to the natural environment, does not destroy the ozone layer, and has a low greenhouse effect. 4.Non-toxic 5

It does not have the ability to be ** and flammable.

Primary refrigerant refers to refrigerant or refrigerant (such as ammonia, freon), and secondary refrigerant refers to refrigerant or refrigerant (such as frozen brine).

1. The automobile refrigerant is added once every 2 to 3 years, and the role of the refrigerant is to use its own physical changes to take away the heat in the car, and under high pressure, the refrigerant forms a liquid and releases heat at the same time.

2. The effects of adding more refrigerant to automobiles are: increasing the pressure of the air conditioning system, high pressure alarms of the automobile air conditioner, and frequently cutting off the compressor work; The refrigeration effect becomes poor; Damage to air conditioning components caused by cave travel; Causing the air conditioning pipe of the car to burst.

3. The emission method of automobile refrigerant plus is as follows: prepare automobile refrigerant ** Ghana stool injection machine and refrigerant tank; Connect the pipeline of the automobile refrigerant ** filling machine to the high and low pressure pipes of the automobile air conditioner; Set the desired refrigerant capacity and start up.

In layman's terms, the primary refrigerant is a fluorine system, that is, the indoor and outdoor units are connected by copper pipes, and the refrigerant flows in the copper pipes through the indoor unit to release cold and absorb heat, also known as direct evaporative air conditioning.

The secondary refrigerant is used in the water system or industry, and a certain proportion of ammonia is added to the water. The host generally has a special computer room, and the host and the indoor unit are generally connected by galvanized water pipes, as well as PPR pipes or large-diameter copper pipes. First of all, the water is cooled to 7 degrees through the main engine (generally 7 degrees, ammonia can be 0 degrees or below) and flows in the pipeline between the main engine and the internal machine, and is cooled and absorbed by the internal machine.

The water in the tubing is the carrier. Such systems are generally referred to as secondary refrigerant systems.

I heard the introduction of Kuwei company once, and the home ** air conditioner can be roughly divided into secondary refrigerant and primary refrigerant system. The so-called secondary refrigerant system refers to the system through the primary refrigerant to transfer the cold heat to the water, and then the water as the secondary refrigerant and then transfer the energy to the end of each need of air conditioning, the principle of this kind of air conditioning basically follows the refrigeration principle of the traditional air conditioner, the difference is only to miniaturize the original large-scale system, so that it is suitable for the needs and ability to pay for ordinary families. It can be said that it is a traditional ** air conditionerMicro version

However, although it follows the advantages of comfortable and luxurious air conditioning, at the same time, it does not seem to be able to solve its inherent shortcomings, such as it occupies more floor height space, and the floor height of commercial housing and residential buildings is generally relatively low, so it also limits the widespread promotion of this air conditioner; The biggest disadvantage is that its energy regulation is single, either fully open or closed, that is to say, if a room needs to use air conditioning, the whole unit needs to run at full load, which will cause great loss and waste of energy. And the primary refrigerant system, also known as:One to manySystem. It can be said to be a product of the development of the principle of household air conditioning to networking, intelligence and systematization.

Hello: In fact, this system is a circulating filtration system, in general, after another filtration cycle, this is the secondary system, of course, a little better than only one system, but the energy consumption is relatively a little more!

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