Born to Freeze

The compressor is the most stressed part in the refrigeration system and there are several technical solutions to improve its reliability. One of the main problems faced by the compressor is the mixing of liquid refrigerant into the oil . When the compressor is located where the ambient temperature is lower than any other part of the system, the liquid refrigerant might migrate from the circuit to the compressor during off cycle or during a long shut down. Whenever the compressor starts, the foam formation could totally or partially remove the oil from the compressor. The crankcase heater, which should be turned on when the compressor is off, increases oil temperature reducing the concentration of liquid refrigerant in the oil. This is one of the possible technical solutions to limit liquid migration. Dorin introduced as optional the self-regulating heater that compared to the standard one adjusts the absorbed power depending on the temperature . In case the temperature of the c...

A s the core moving part of a refrigeration system is the compressor, its installation level directly affects its performance and durability. The installation needs are not all the same between the different types of compressors due to the different ways of compressing the refrigerant. Today I would like to discuss with you the main installation points of a   piston compressor. Key point one: reduce vibration of compressor As we all know, by using the piston to compress the refrigerant, the reciprocating compressor suffers more serious vibrations than other types of compressors. Reducing running vibrations is significant for both the compressor and the entire refrigeration system, which can reduce noise and make the compressor run more peacefully. if we cannot effectively reduce vibrations, the welded connection points between the compressor and the suction or discharge pipes are easy to break during operation, causing refrigerant leakage and affecting the performance of ...

Truly, every refrigerant is able to harm if not properly handled. But actually one of the feature which drives the fear toward carbon dioxide is exactly the one which is bringing the largest benefit: high pressure is frightening but is also the quality providing stunning heat transfer properties when CO2 is used into a refrigeration system. However high pressure shall not be frightening at all, because with an appropriate design a CO2 system is simple and safe, like every other system. And, though is working with higher pressures, a CO2 system uses smaller or similar pipe wall thickness to other systems, too ! Do you dare to unbelieve this? Just consider the following example. Let’s pretend I am the owner of a supermarket chain and I am planning to open a new small size point of sales requiring a total of 50kW refrigeration capacity, with 50 meters overall pipe length. When thinking about choosing R404A , my engineers have dimensioned the evaporators return lines to th...