Technically, vapor is a gas which is below its critical temperature, which means that it may be condensed into a liquid by rising its pressure and without decreasing the temperature. An open compressor has a motor drive which is outside of the refrigeration system, and provides drive to the compressor by means of an input shaft with appropriate gland seals. In addition to the operational controls, separate high-pressure and low-stress switches are usually utilised to supply secondary safety to the compressors and different components of the system from working outside of protected parameters.

In small refrigeration systems the oil is allowed to circulate throughout the whole circuit, but care should be taken to design the pipework and elements such that oil can drain back below gravity to the compressor. The kind of oil could also be mineral or synthetic to suit the compressor sort, and also chosen in order to not react with the refrigerant type and different components within the system. In such programs, the condensed liquid refrigerant may be routed right into a stress vessel, called a receiver, from which liquid refrigerant is withdrawn and routed by way of a number of pipelines to the a number of enlargement valves and evaporators.

Large commercial or industrial refrigeration methods could have multiple expansion valves and a number of evaporators to be able to refrigerate multiple enclosed areas or rooms.

The most common compressors utilized in refrigeration are reciprocating and scroll compressors, vapearoma but massive chillers or industrial cycles might use rotary screw or centrifugal compressors. Rotary screw compressors are also optimistic displacement compressors. Reciprocating compressors are piston-model, constructive displacement compressors.

However the usage of liquid injection for additional cooling can usually overcome this difficulty in most airtight motor compressors. Compressors are often described as being both open, hermetic, or semi-hermetic, to explain how the compressor and/or vapingshopuk motor is situated in relation to the refrigerant being compressed. Typically in airtight, and ezigarettensale most semi-hermetic compressors (typically often known as accessible hermetic compressors), the compressor and motor driving the compressor are integrated, and function within the refrigerant system.

The motor is hermetic and is designed to function, ezigarettediy and be cooled by, the refrigerant being compressed. The obvious disadvantage of airtight motor compressors is that the motor drive can't be maintained in situ, vapezigaretten and the entire compressor have to be eliminated if a motor fails. Oil separators usually are not 100% efficient so system pipework should still be designed so that oil can drain again by gravity to the oil separator ezigarettensale or compressor.