초록 ▼

There is disclosed a new and improved cooling system and method for cooling the air in an enclosed space. The cooling system includes a cooling tower having a plurality of fans arranged to cool a first fluid and a chiller including a condenser thermally coupled to the first fluid, a compressor, and

There is disclosed a new and improved cooling system and method for cooling the air in an enclosed space. The cooling system includes a cooling tower having a plurality of fans arranged to cool a first fluid and a chiller including a condenser thermally coupled to the first fluid, a compressor, and an evaporator. The chiller further includes first conduit means for carrying a refrigerant. A chilled fluid loop including second conduit means circulates a second fluid through the evaporator for cooling the second fluid and is arranged to flow air over the second conduit means and into the enclosed space for cooling the air in the enclosed space. Fan control means controls the speed of the cooling tower fans to minimize the total power consumption of the fan motors and the compressor. The fan control means include load determining means for determining the heat transfer load on the chiller, control factor means for generating a control factor which is proportional to the load on the chiller, and speed control means for increasing or decreasing the speed of one or more of the fans responsive to the control factor.

대표청구항 ▼

A cooling system for cooling the air in an enclosed space, said cooling system comprising: a condenser fluid loop including a cooling tower including a plurality of fans with each said fan including a respective fan motor, said cooling tower fans being arranged to cool a first fluid; a chiller inclu

A cooling system for cooling the air in an enclosed space, said cooling system comprising: a condenser fluid loop including a cooling tower including a plurality of fans with each said fan including a respective fan motor, said cooling tower fans being arranged to cool a first fluid; a chiller including a condenser thermally coupled to said first fluid, a compressor, and an evaporator, said chiller including first conduit means for carrying a refrigerant; a chilled fluid loop including second conduit means for circulating a second fluid through said evaporator for cooling said second fluid and being arranged to flow air over said second conduit means and into said enclosed space for cooling the air in said enclosed space; and fan control means for controlling the speed of said cooling tower fans to minimize the total power consumption of said fan motors and said compressor, said fan control means including load determining means for determining the heat transfer load on said chiller, control factor means for generating a control factor which is proportional to said load on said chiller, and speed control means for increasing or decreasing the speed of one or more of said fan motors responsive to said control factor, wherein said control factor (Gtwr) is the optimal total air flow to be provided by said fans divided by the maximum possible air flow with all said fans operating at maximum speed, and wherein (Gtwr) is equal to: 1-btwr(PLRtwr,cap-PLR) wherein: PLR is the chiller load divided by the total chiller cooling capacity (part-load ratio); PLRtwr,cap is the part-load ratio at which said cooling tower operates at maximum capacity; btwr is the slope of the relative tower air flow versus the part-load ratio; and PLR>0.25.