초록 ▼

In one exemplar embodiment, method and apparatus for controlling capacity of a multiple-stage cooling system is disclosed which utilizes means for establishing a single predetermined cooling stage “cut-in”pressure and a single predetermined cooling stage “cut-out”pressure, means for determining that

In one exemplar embodiment, method and apparatus for controlling capacity of a multiple-stage cooling system is disclosed which utilizes means for establishing a single predetermined cooling stage “cut-in”pressure and a single predetermined cooling stage “cut-out”pressure, means for determining that the “cut-in”or “cut-out”pressures have been reached in the system, a delay means for introducing a selected minimum time delay after determining that the refrigerant fluid pressure has either reached the established “cut-in”or “cut-out”pressures, and control means for controlling the turning on or off of the next cooling stage after the time delay has elapsed.

대표청구항 ▼

A method for controlling system compressor capacity in a refrigeration system having a plurality of equal capacity, commonly piped compressors to obtain an energy efficient operating system, comprising the steps of: (a) establishing an operation suction pressure range having an upper limit and a low

A method for controlling system compressor capacity in a refrigeration system having a plurality of equal capacity, commonly piped compressors to obtain an energy efficient operating system, comprising the steps of: (a) establishing an operation suction pressure range having an upper limit and a lower limit; (b) setting the suction pressure range to obtain an operating average suction pressure therein that results in an optimal operating efficiency for said system; (c) detecting the suction pressure in the system for determining when said pressure exceeds said upper limit and when said pressure is below said lower limit; (d) generating an increase capacity signal when said operating suction pressure exceeds said upper limit and a decrease capacity signal when said operation suction pressure is below said lower limit; and (e) applying said increase capacity signal and said decrease capacity signal to said compressors to respectively energize and deenergize said compressors in a sequence, said sequence permitting at least N incremental system capacity changes to occur between successive energizations of any one of said compressors, where N is the number of compressors in the system and each incremental system capacity change is equal to the capacity of a compressor.