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What are the ingredients of Mixed refrigerant R407C?
The mixed refrigerant R407C is composed of several refrigerants. Its main components are R32, R125 and R134a. These three are mixed in a specific ratio to create the characteristics of R407C.
R32, chemically called difluoromethane, has good refrigeration efficiency and low greenhouse effect potential. Among R407C, R32 accounts for about 23%. This component can effectively provide the thermal properties required for refrigeration and contribute an important refrigeration capacity to the mixed refrigerant.
R125, that is, pentafluoroethane, is also an important component of R407C, accounting for about 47%. Its chemical properties are stable, and it can assist in maintaining good pressure and temperature characteristics in the refrigeration system. And R125 can adjust the overall performance of the mixed refrigerant to make it more suitable for different working conditions.
In addition, R134a and tetrafluoroethane account for about 30% of R407C. R134a has good heat transfer performance and chemical stability, and is more friendly to the environment. It works synergistically with R32 and R125 in the mixed refrigerant to ensure the efficient and stable operation of the refrigeration system.
These three refrigerants are mixed in such a ratio, so that R407C has a refrigeration performance similar to that of R22, which can be used as an alternative refrigerant for many refrigeration equipment. However, because it is a non-azeotropic mixed refrigerant, the temperature slip phenomenon exists during the phase change process, and attention should be paid to the system design and operating conditions when using it to achieve the best cooling effect.
What are the physical properties of Mixed refrigerant R407C?
The mixed refrigerant R407C is made by mixing R32, R125 and R134a in a specific ratio. It has several physical properties and is hereby referred to as Jun Chenzhi.
First of all, its thermodynamic properties. The boiling point of R407C is about -43.4 ° C. Under general refrigeration conditions, it can evaporate and absorb heat efficiently to achieve the purpose of refrigeration. And its critical temperature is quite good, about 72.5 ° C, and the critical pressure is about 4.62 MPa, which makes it suitable for various refrigeration systems under different temperature and pressure conditions.
Times and heat transfer properties. R407C has good heat transfer performance. In evaporators and condensers, it can quickly exchange heat with the surrounding medium and improve refrigeration efficiency. Its thermal conductivity can be maintained in a suitable range under specific working conditions, which helps the system to operate efficiently.
Re-examine the flow properties. The viscosity of this mixed refrigerant is moderate, and when it flows in the pipeline, the flow resistance is small, so it can reduce the pump power consumption and improve the overall energy efficiency of the system. And its density is also similar to that of commonly used refrigerants, which is convenient for system design and operation.
In addition, R407C has good chemical stability. Under normal use conditions, it is not easy to chemically react with system materials, which can ensure the long-term stable operation of the refrigeration system. However, it should be noted that because it is a mixed refrigerant, the separation of components should be prevented during use to ensure its stable performance.
Mixed refrigerant R407C is suitable for which refrigeration equipment
The mixed refrigerant R407C is suitable for many refrigeration equipment. Its application scenarios are as follows:
In the field of commercial refrigeration, in the refrigerated display cabinet of supermarkets, R407C has good performance. This cabinet needs to maintain a specific low temperature to keep all kinds of food fresh. R407C has high refrigeration efficiency, can quickly cool down and maintain the required temperature stably, so that food is as fresh as ever.
In air conditioning systems, whether it is a household split air conditioner or a large commercial central air conditioner, R407C is useful. For household air conditioners, it can efficiently adjust the indoor temperature and create a comfortable environment. In large central air conditioners, it can adapt to complex environments and ensure temperature control in large areas.
Chillers are also suitable for R407C. Chillers supply low-temperature cold water for industrial production, commercial places, etc. The R407C ensures the stable operation of the chiller, providing continuous and stable low-temperature cold water to meet the needs of production and environmental control.
Freezer is also suitable for it. Freezer storage is used for long-term storage of frozen food and other items, which requires extremely low temperatures. With good refrigeration performance, R407C can maintain the freezer at low temperatures and ensure the quality of items.
Mixed refrigerant R407C environmental performance
There is a mixed refrigerant R407C today, and its environmental performance is also a question. R407C is made of R32, R125 and R134a mixed in a certain proportion. Its environmental performance is unique.
First of all, the ozone depletion potential (ODP), which is related to the degree of damage to the ozone layer. The ODP of R407C is zero, which is a blessing, which means that it has no risk of damage to the ozone layer. This is a significant improvement over the chlorine-containing refrigerants of the past, such as R22. In the past, refrigerants such as R22, ODP was non-zero, and long-term use caused the ozone layer to thin, which was very harmful.
Times and Global Warming Potential (GWP). The GWP of R407C is about 1774. Although it is lower than that of R22, it is still not very low. The higher GWP means that it will remain in the atmosphere for a long time and has a strong force to cause global warming. From an environmental perspective, this value still needs to be reduced in order to reduce the impact on the global climate.
Furthermore, the toxicity and flammability of R407C. It has low toxicity, and under normal use, it poses a slight threat to human health. And it is a non-flammable refrigerant. It can reduce fire hazards in the place of use, and it is quite good in terms of safety.
However, considering its environmental performance, although it contributes to the protection of the ozone layer, the problem of GWP value still needs to be solved. In order to achieve better environmental protection, it is urgent to develop alternative refrigerants with low GWP or optimize the use of R407C to reduce its emissions. In this way, it is necessary to meet the long-term needs of environmental protection.
Mixed refrigerant R407C during use
When using mixed refrigerant R407C, there are several things to pay attention to.
First, it is related to its physical properties. R407C is made by mixing R32, R125 and R134a in a specific ratio. Its phase change characteristics are different from that of a single refrigerant, and the temperature slip phenomenon is significant in the evaporator and condenser. The user must understand this characteristic. When designing and operating the system, the influence of temperature slip on the heat transfer efficiency should be taken into account to ensure that the system reaches the best operating state.
Second, the charging method is very important. Because it is a non-azeotropic mixed refrigerant, the liquid charging method should be used when charging. If it is charged in a gaseous state, it will cause the proportion of components to change and affect the cooling performance. The charging process must be operated precisely, according to the charging amount specified by the system, and injected with suitable tools and methods to ensure that the refrigerant composition is correct and the system performance is stable.
Third, equipment matching cannot be ignored. The working pressure and cooling capacity parameters of R407C are different from some traditional refrigerants. When selecting compressors, expansion valves, heat exchangers and other equipment, it must be adapted according to the characteristics of R407C. For example, compressors, their compression ratio, displacement and other parameters must meet the operating requirements of R407C, otherwise it will damage the efficiency and reliability of the system.
Fourth, safety protection is also a priority. Although R407C is a low-toxic and non-flammable refrigerant, it can still cause asphyxiation risk if it leaks a lot in a confined space. When the place of use is well ventilated, and when working, the operator should prepare protective equipment, such as protective glasses, gloves, etc., to prevent the refrigerant from contacting the skin and eyes, causing discomfort or injury.