HangZhou Refrigeration Exhibition
November 1, 2024
News
Environmentally Friendly Refrigerant – Hydrocarbon Refrigerant
- September 22, 2022
- Fonsum
Our main products include isobutane R600a, propane R290, propylene R1270, isopentane R601a, cyclopentane, and other hydrocarbon refrigerants and blowing agents, which are the products of today’s environmentally friendly refrigerants.
The gas-liquid two-phase refrigerant absorbs heat by evaporating and cooling in the evaporator. After becoming a gaseous refrigerant, it is compressed by the compressor to become a high-temperature and high-pressure gaseous refrigerant, and then condensed into a liquid refrigerant by the condenser, and then goes to the evaporator after passing through the expansion valve. To sum up, the refrigerant moves the heat from the evaporating chamber to the condenser for discharge.
There are also many types of refrigerants. Ammonia, freon, and hydrocarbons are widely used in compression refrigerators. Refrigerants are divided into freon, hydrocarbon refrigerants, inorganic compound refrigerants, and azeotrope refrigerants.
Physical properties of ideal refrigerant
1. The evaporation pressure should be high
If the evaporation pressure of the refrigerant is lower than the atmospheric pressure, the air is easy to intrude into the system, and it is difficult to handle the system. Therefore, it is hoped that when the refrigerant evaporates at a low temperature, its evaporation pressure can be higher than the atmospheric pressure.
2. The latent heat of evaporation should be larger
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
If the critical temperature is high, it 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
Low condensing pressure means that the refrigerant can be liquefied with a lower pressure, 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 the gaseous refrigerant is smaller
The smaller the specific volume of the gaseous refrigerant, the better, the volume of the compressor can be reduced and the cost can be reduced, and the suction pipe and the exhaust pipe can be piped with smaller refrigerant.
7. The density of the liquid refrigerant should be high
The higher the density of the liquid refrigerant, the smaller the liquid pipe can be.
8. It is soluble in refrigeration oil, so the system does not need to install an oil separator.
Chemical properties of ideal refrigerants
1. The chemical properties are stable. The evaporation temperature will change with the application temperature. For example, the evaporation temperature of the ice water machine is about 0~5℃. The refrigerant only has physical changes in the refrigeration cycle system, but no chemical changes, and does not have a decomposition effect.
2. Non-corrosive, non-corrosive to steel and metal. Ammonia is corrosive to copper, so copper piping should not be used in ammonia refrigeration systems. The insulation is better, otherwise the insulation of the compressor motor will be damaged. Therefore, ammonia should not be used in hermetic compressors to avoid direct contact with copper coils.
3. No environmental pollution, harmless to the natural environment, no damage to the ozone layer, and low greenhouse effect.
4. Non-toxic.
5. Not explosive and flammable.
What are the general principles of refrigerant selection?
1. Cooling performance
We expect the condensing pressure of the refrigerant to be not too high, and the evaporating pressure to be above or not much below atmospheric pressure. The pressure is moderate, the exhaust temperature is not too high, the cooling capacity per unit volume is large, the performance coefficient of the cycle is high, and the heat transfer is good.
2. Practicality
The chemical stability and thermal stability of the refrigerant are good, and it will not decompose or deteriorate during the refrigeration cycle. toxic free and safe.
3. Environmental acceptability
Environmental protection requirements to protect the atmospheric ozone layer and reduce greenhouse benefits should be met. The ODP must be 0, and the GWP should be as small as possible.
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