Unfortunately, the compression process imparts heat into the refrigerant being compressed. This heat is called the “heat of compression” and is directly related to the compression ratio. A decrease in suction pressure or an increase in discharge pressure will result in a higher theoretical discharge temperature. High discharge temperatures increase friction and cause lubricating oils to break […]
Most refrigeration systems are subject to variable system loads caused by weather and product load fluctuations. For this reason, refrigeration systems must be capable of operating at “part load”. Engineers and plant operators achieve this, in part, by utilizing capacity control in compressors. In reciprocating compressors, capacity control is accomplished by what is called “cylinder […]
Most compressors are configured with an oil separator downstream of the compressor. An oil separator is a vessel that is specially designed to “separate” any oil in the discharge vapor and return it back to the compressor where it is wanted. Oil that escapes the separator is unwanted and results in fouling on heat exchange surfaces and […]
“Rotary vane compressors” are a third type of positive displacement compressor. The design of these machines makes them well suited for “high volume”, low-pressure differential applications. As such, rotary vane compressors are essentially limited in application as “booster compressors” in two-stage systems. The maximum compression ratio of a rotary vane compressor is 4:1. Like screw compressors, […]
The most common type of screw compressor is the ‘rotary screw compressor’. This type of compressor utilizes two rotors which are often called helical screws. One screw is designated the “male” screw and the other is a “female” screw. Vapor is drawn into the screw and captured in the space between the screws. The screws are precisely […]
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