Ice machine refrigerants are divided into ammonia refrigerant and frozen refrigerant, so what is the difference between these two refrigerants?

1. Operating cost. The working fluid of the ammonia refrigeration system is cheap, and the unit refrigerating capacity of the refrigerating medium is large, the power consumption is less, and the operating cost is low. Fluorine refrigeration systems have relatively high working fluid prices, small unit refrigeration capacity, relatively high power consumption, and high operating costs.

2.environmental protection characteristics. The refrigerant ammonia in the ammonia refrigeration system is a natural working fluid with ozone depletion coefficient and no pollution to the environment. The CFCs working fluid of the fluorine refrigeration system has a low ozone depletion coefficient ODP and a small global warming coefficient GWP due to its ozone-depleting characteristics, which has a certain destructive effect on the environment.

3. energy-saving characteristics. The refrigeration coefficient COP of the ammonia refrigeration system is larger, and the energy saving effect is better. The refrigeration coefficient of fluorine refrigeration system is small, and the energy-saving effect is poor.

4. safety. When the volume concentration of ammonia in the air reaches 0.5 to 0.6%, people can be poisoned by staying in it for half an hour, and it can be ignited when the concentration reaches 11 to 14%. When the concentration reaches 16 to 25%, it will cause an explosion. my country has clearly stipulated In densely populated places, toxic refrigerants that are inflammable and explosive cannot be used. Freon is colorless, odorless, non-combustible, non-explosive, and has stable chemical properties (my country's national standard GB7778-87 comprehensively considers the flammability, explosiveness, and direct harm to the human body of the refrigerant, and classifies the refrigerant safely. , R22 is listed as the first safety category, and R717 is listed as the second safety category), fluorine can be applied to high temperature, medium temperature, and low temperature refrigerators to meet the requirements of different cooling temperatures, and the lowest evaporation temperature that can be produced It is -80°C.

5. Liquid supply and return gas pipeline. Ammonia systems generally use bottom-in and top-out methods to connect evaporators, and fluorine systems generally use top-in and bottom-out methods to connect evaporators to facilitate oil return. The horizontal suction pipe of the ammonia system should slope to the circulation barrel or gas-liquid separator, and the horizontal suction pipe of the fluorine system should slope to the compressor.

6.  liquid supply method. Both the ammonia system and the fluorine system can use direct liquid supply, liquid pump liquid supply and gravity liquid supply to supply liquid to the evaporator.

7.the scope of application. Both the ammonia system and the fluorine system are medium-temperature refrigeration working fluids with moderate pressure and temperature. They can be used for refrigeration, air conditioning, industrial refrigeration, beer and pharmaceutical industries. The fluorine system is safer when used in direct evaporative air conditioning systems. The ammonia system can use indirect cooling (via refrigerant) for air conditioning.

8. Degree of automation control. The fluorine system is highly automated and generally does not require manual operation, which can save labor costs. Ammonia systems are mostly manually operated, with a low degree of automation, but good operational stability (now ammonia refrigeration equipment is also highly automated).

9. noise and vibration comparison. The ammonia ice machine is relatively large in size, with great noise and vibration, which has a great impact on the environment. The fluorine machine system has low noise and vibration.

10. The solubility of ammonia and oil is small. An oil film is easy to form on the surface of the ammonia system heat exchanger, which affects heat transfer. Therefore, the evaporator, condenser, accumulator, intercooler, and oil-ammonia separator should be drained regularly. In the fluorine system, fluorine and oil dissolve each other, and no oil film will be formed on the surface of the heat exchanger, which will not affect heat transfer, but too much oil in the evaporator will increase the evaporation temperature. The fluorine system is generally equipped with an automatic oil return device. The design and installation of the fluorine system pipeline should consider the setting of an oil return bend, and the parallel unit should consider the problem of oil balance.

11. Applicable. Ammonia systems are generally suitable for large and medium-sized ice making machine, industrial ice maker machine, ice making, artificial ice rinks and indirect central air-conditioning. Fluorine systems are generally applicable to refrigerators, freezers, display cabinets, household air conditioners, commercial air conditioners, small and medium-sized cold storage and freezing, factory low temperature air conditioners, mine air conditioners, ice cream, cold drinks, edible ice, artificial ice rinks, and small industrial refrigeration.