| 摘要 |
An HVAC system having a main circuit (100) and a subcooler circuit (210). The main circuit includes a main circuit evaporator (140), a main circuit expansion device (126), a main circuit condenser (118, 120) and a main circuit compressor (110, 112) connected in a closed refrigerant loop. The subcooler circuit (210) includes a subcooler evaporator (222), a subcooler expansion device (256), a subcooler condenser (260) and a subcooler compressor (250) connected in a closed refrigerant loop. The subcooler evaporator is arranged and disposed to exchange heat between liquid refrigerant in the main circuit and the refrigerant in the subcooler circuit to cool the liquid refrigerant in the main circuit prior to entering the main circuit evaporator. The operation of the subcooler circuit provides an increased cooling capacity per unit of a mass flow of cooling fluid through the main circuit condenser and subcooler condenser for the HVAC system with a predetermined design efficiency.
|
