Patent ID: 6196168
Filing Date: 2001-03-06
Classification: F01P,F28F

Abstract:
A system for preheating or cooling a fluid with the coolant for an internal combustion engine comprising:a cooling circuit including an internal combustion engine, a radiator and a first bypass for said radiator;a heat exchanger having a coolant flow path and a fluid flow path for fluid to be preheated or cooled in heat exchange relation with said coolant flow path; anda first valve in said cooling circuit for controlling coolant flow from said radiator and said first bypass through said heat exchanger coolant flow path, said first valve having a) a first state causing coolant flow from only said first bypass through said heat exchanger coolant flow path to heat said fluid, b) a second state causing coolant to flow from both said radiator and said first bypass through said heat exchanger coolant flow path to cause said fluid to attain a desired temperature, and c) a third state causing coolant flow from only said radiator through said heat exchanger coolant flow path to cool said fluid.