DX-CHILLERS:

For cooling the secondary refrigerants, chillers are used. In working the DX chiller is similar to the dry expansion coil. The liquid refrigerant feed is through an expansion valve which ensures superheated gas at the suction outlet of the chiller. Mainly it is shell and tube type. The water or liquid to be cooled in the shell, while the refrigerant is in the tubes. Baffles are provided in the water passage in the shell of the chiller, thereby maintaining good velocity of water/liquid over the tubes to get good heat transfer efficiency.