Cold storage refrigerant freon and the economy comparison of liquid ammonia
ammonia refrigeration system and the economy analysis of freon refrigeration system of the refrigerant with the longest history in ammonia refrigeration system is to use, it has good thermal properties, cyclic process the high and low pressure is moderate, has higher unit volume refrigerating capacity and higher refrigeration coefficient, was widely used in our country, however, ammonia explosive, toxic and strong pungent odor, large equipment, accessory equipment and complex system, operation and maintenance is difficult, it is not easy to realize the automatic operation control, so has been replaced with the freon refrigeration system. The following for ammonia refrigeration system compared with various specifications of freon refrigeration system:
a, running cost:
power
in order to achieve the project refrigeration design requirements, using freon refrigeration system ( Excluding air cooler) , than the 15% ammonia refrigeration system, the lower the power of working medium.
operation management costs
ammonia refrigeration system consists of refrigeration units, ammonia, oil separator, high pressure accumulator, condenser, low pressure circulation liquid storage barrel, oil trap, and other components of the ammonia pump and cooling fan, line is complex, difficult operation management, professional level requirements for the operator is very high, at the same time due to the difficult to automate, system requires operator on duty 24 hours operation management, according to three people per class, about 12 operators technology ( Class 4 3) Simple: and freon refrigeration system pipe, valve etc can be less operation, high degree of automation, only 2 ~ 3 person can manage the operation, can save labor 200000 yuan a year.
maintenance cost
ammonia refrigeration system on average every 3000 hours (running About 3 months) To unit spare parts for maintenance, replacement, at the same time, change a lot of lubricating oil: ammonia refrigerant although cheap, but due to the ammonia refrigeration compressor more open, easy to leak, each year to add a lot of refrigerant:
2, initial investment
construction investment: attachment ammonia refrigeration system is more, need to set the room and equipment, covering an area of large.
ammonia refrigeration system capacity increases about 15%.
3, other
1, freon refrigeration system adopts parallel unit, a single compressor power is small, when the outdoor temperature in winter is low, refrigeration unit can be regulated automatically multistage energy, when the load is bigger, many sets of compressor running at the same time, and when winter load is small, may be part of the compressor operation, and energy saving effect is very obvious: although ammonia refrigeration compressor can also adjust energy ( Manual) , but the bigger compressor standalone power, energy saving effect is not obvious.
2, ammonia and lubricating oil miscibility, ammonia system in operation after a period of time, at the bottom of the condenser, air cooler and other heat exchange equipment to collect a large amount of oil, results in lower heat exchanger heat efficiency. So you need to manually on a regular basis.
3, when the concentration of ammonia in the air reaches a certain value, the encounter bright fire to explode easily, require room with good ventilation, in this way, computer room and equipment can only be set in the one horn of the cold storage or between individual Settings, cause the system line is longer, cold mass loss is bigger.
4, due to large ammonia toxicity, once leakage, leakage, especially the part of the rolls, will cause pollution of the rolls of the items, affect the quality of the product.
5, because the ammonia refrigeration system with low degree of automation, reliability and economy of system operation is basically decided by researchers, loaded store item quality is determined by the operator, which makes operating personnel to be trained to master operation skills in; And freon refrigeration system for automatic operation, the reliability of the system basically not influenced by artificial factors.
this release of the refrigerant, freon manufacturers, for details, please click on the query.
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