Cooling systems and methods incorporating a plural in-series pumped liquid refrigerant trim evaporator cycle

Abstract

The cooling systems and methods of the present disclosure relate to a plural in-series pumped liquid refrigerant trim evaporator cycle that may be incorporated into an existing cooling system to increase the efficiency of the existing cooling system. The cooling systems of the present disclosure include a first evaporator coil in thermal communication with an air intake flow to a heat load, such as a heat load being cooled by the existing cooling system, and a first liquid refrigerant distribution unit in thermal communication with the first evaporator coil. The cooling systems further includes a second evaporator coil disposed in series with the first evaporator coil in the air intake flow and in thermal communication with the air intake flow, and a second liquid refrigerant distribution unit in thermal communication with the second evaporator coil. A trim compression cycle of the second liquid refrigerant distribution unit is configured to incrementally further cool the air intake flow through the second evaporator coil when the temperature of the free-cooled first fluid flowing out of the main compressor of the second liquid refrigerant distribution unit exceeds a predetermined threshold temperature.

What is claimed is: 
     
         1 . A cooling system comprising:
 a first evaporator coil in thermal communication with an air intake flow to a heat load;   a first liquid refrigerant distribution unit in thermal communication with the first evaporator coil and a first fluid free-cooled by a fluid cooler;   a second evaporator coil disposed in series with the first evaporator coil in the air intake flow and in thermal communication with the air intake flow to the heat load;   a second liquid refrigerant distribution unit in thermal communication with the second evaporator coil and the first fluid free-cooled by the fluid cooler; and   wherein a trim compression cycle of the second liquid refrigerant distribution unit is configured to incrementally further cool the air intake flow through the second evaporator coil when the temperature of the free-cooled first fluid flowing out of the second liquid refrigerant distribution unit exceeds a predetermined temperature.