Patent ID: 8250879
Filing Date: 2012-08-28
Classification: F25B,F28D,F28F

Abstract:
1. A chiller system of the type having first and second refrigeration circuits with each refrigeration circuit having a compressor, a condenser, an expansion device and an evaporator and with the respective evaporators in the first and second circuits having a plurality of tubes to conduct the flow of fluid to be cooled, and with the respective evaporators of the first and second circuits being interconnected in series relationship such that the fluid to be chilled passes serially through the respective evaporators of the first and second circuits, comprising: an evaporator waterbox interconnected between the evaporators of the first and second circuits and having at least three passages therein with the first passage having a water inlet connection and a second passage having a water outlet connection; each of the evaporators of the first and second circuits having first and second pass tubes interconnected at their ends by a return bend; such that the water flows into said first passage and then into one of the evaporators of the first and second circuit, flowing serially through said first pass, said return bend and through said second pass, and then into a third passage of said evaporator waterbox prior to flowing through said other evaporator, flowing serially through said first pass, said return bend and through said second pass and then into said second passage and out the water outlet connection.