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As with all chiller systems, screw chillers consist of an evaporator, expansion valve, refrigerant, internal piping and controls. Their compressor is the main point of difference in screw chillers, which use two helical rotors to drive and compress the refrigerant gas.
1. The positioning of the unit and the location of the unit is determined mainly by considering the load-bearing capacity of the floor and the influence of the unit's air intake and output.
Portable chillers are often optimized to provide a fixed amount of heat transfer capacity (in tons). They are ideal when a piece of process equipment requires a cooling stream at a significantly different temperature than the rest of the equipment.
Chiller performance varies greatly with operating conditions. Full-load performance is not a good indicator of overall performance because chillers rarely operate at full load. Instead, part-load performance is critical to good overall chiller performance.
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