Screw vs Reciprocator Compressors Types of Refrigeration Compressors

Screw compressors and reciprocating compressors are the two main types of refrigeration compressors for ice manufacturing.  Both types can have sophisticated controls allowing for operators not to be present allowing for multiple compressors to work seamlessly together.  

Screw compressors are generally more efficient when operating at full-load capacity and are inefficient below the 50% capacity when compared with reciprocating machines. However, reciprocating compressors are better suited for systems that have high load variability.

Comparison:

Screw Compressor Reciprocating Compressor
Ideal for multiple ice makers driven off a compressor and where operators may not be present Ideal for single ice maker operation on a single compressor with high load variability. Works well for constant loads, such as flake ice makers
Very efficient when operating at 85% or more loaded Below 100% capacity, reciprocating compressors use less power than similarly-sized screw compressors
Better suited for base loading and operation at full load and never needs to be unloaded completely - Infinite unloading levels but will shut down if fully unloaded Unloads 100% with no efficiency loss. Unloads in increments (75%, 50%, 25% unloading for example)
Requires less maintenance Simple to maintain and rebuild
Two 75-ton Vogt ice makers only require one screw compressor saving approximately 30% on the compressor purchase
Cons Cons
Less efficient at below 50% capacity Requires more maintenance
Difficult to run on just one machine

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