초록 ▼

An optimization system for switching between plural parallel connected chillers in a refrigeration system is disclosed which system establishes optimized changeover criteria based upon the design refrigerant head for the chillers, the minimum refrigerant head for the chillers, the capacity of the ch

An optimization system for switching between plural parallel connected chillers in a refrigeration system is disclosed which system establishes optimized changeover criteria based upon the design refrigerant head for the chillers, the minimum refrigerant head for the chillers, the capacity of the chillers at design head and the capacity of the chillers at minimum head, and which system, using these criteria, calculates optimized switchover capacity as a function of the present actual refrigerant head. The system then compares the optimized switchover capacity to the present building load and, if the capacity is insufficient to meet the building load, an additional chiller is switched in and, if the optimized switchover capacity is greater than the building load and more than one chiller is operating, one of the chillers is disconnected.

대표청구항 ▼

An optimization system for switching between at least first and second parallel connected chillers of a plural chiller refrigeration system, said chillers having an optimized range of changeover capacities defined at one end by an optimized changeover capacity at design refrigerant head of said firs

An optimization system for switching between at least first and second parallel connected chillers of a plural chiller refrigeration system, said chillers having an optimized range of changeover capacities defined at one end by an optimized changeover capacity at design refrigerant head of said first chiller and at the other end by an optimized changeover capacity at minimum refrigerant head of the first chiller, said optimization system comprising: first means for supplying signals from which the actual load capacity of said building can be determined; second means for supplying signals from which the actual refrigerant head of said chillers can be determined; and, third means responsive to said first and second means for determining said actual load capacity, said actual refrigerant head, an optimized switchover capacity based upon said actual refrigerant head, said design refrigerant head, said minimum refrigerant head, said optimized changeover capacity at said design refrigerant head and said optimized changeover capacity at said minimum refrigerant head, and for comparing said optimized switchover capacity to said actual load capacity to switch on both chillers when said actual load capacity exceeds said optimized switchover capacity and to switch off one of said chillers when said actual load capacity falls below said optimized switchover capacity. A method for optimally switching on and off chillers in a parallel connected plural chiller refrigerant system, said chillers having an optimized range of changeover capacity defined at one end by an optimized changeover capacity at design refrigerant head and at the other end by an optimized changeover capacity at minimum refrigerant head, said method comprising the steps of: determining actual load of said building in terms of capacity; determining actual refrigerant head for said chillers; determining an optimized switchover capacity based upon actual refrigerant head, design refrigerant head, minimum refrigerant head, optimized changeover capacity at design refrigerant head, and optimized changeover capacity at minimum refrigerant head; comparing the actual load in terms of capacity and the optimized switchover capacity; and, switching on an additional chiller when the actual load in terms of capacity exceeds the optimized switchover capacity and switching off a chiller when the actual load in terms of capacity falls below the optimized switchover capacity.