US 10,760,840 B2 · Dual-compressor refrigeration unit

Abstract

A refrigeration unit may include a first compressor constructed and arranged to compress a first refrigerant, and a second compressor constructed and arranged to compress a second refrigerant. A first condenser of the refrigeration unit is operatively coupled to the first compressor, and a second condenser is operatively coupled to the second compressor. An evaporator of the refrigeration unit is constructed and arranged to flow the first and second refrigerants received from the respective first and second condensers for chilling a heat transfer fluid. A controller of the refrigeration unit includes a computer processor and a storage media for executing a pre-programmed algorithm for initialing the second compressor when a predetermined crossover frequency of the first compressor is reached as a system load increases.

Claims16

Dependent claims

A method of operating a dual-compressor refrigeration unit comprising:

increasing a first compressor speed as load demand increases;
and
initializing a second compressor when a frequency reaches a pre-established crossover frequency of the first compressor, wherein the first compressor is associated with a first condenser, and the second compressor is associated with a second condenser, and a first heat transfer fluid flows from the first condenser and into a common evaporator for chilling a second heat transfer fluid, and a third heat transfer fluid flows from the second condenser and into the common evaporator for chilling the second heat transfer fluid, and such that the first heat transfer fluid remains separate from the third heat transfer fluid, wherein the crossover frequency is dynamically controlled and computed based on a capacity and a maximum speed of the first compressor.

Dependencies are inferred from the claim text.

Dual-compressor refrigeration unit

Life of this patent

Dual-compressor refrigeration unit

Life of this patent

Abstract

Claims16