Device and method for cooling and preheating

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 coolant flowing through the cooling circuit;
• a heat exchanger having a coolant flow path for said coolant and a fluid flow path for another fluid to be preheated or cooled in heat exchange relation with said coolant in said coolant flow path;
• and
• a first thermostatic valve in said cooling circuit for directing said coolant from said at least one of said radiator and said bypass through said heat exchanger coolant flow path dependent upon an operating temperature of said coolant in the cooling circuit;
• said cooling circuit comprising a second bypass for said radiator;
• and
• a second thermostatic valve in said cooling circuit for controlling coolant flow from said internal combustion engine through the radiator and the second bypass dependent upon an operating temperature of the cooling circuit;
• said second thermostatic valve changing between a) a first state causing coolant flow from said internal combustion engine through the second bypass and b) a second state causing coolant flow from said internal combustion engine through the radiator at a first operating temperature of the coolant in the cooling circuit;
• and
• said first thermostatic valve changing between a) a first state causing coolant flow from only said first bypass through said heat exchanger coolant flow path to heat said fluid, and 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 at a second operating temperature of the coolant in the cooling circuit which is less than the first operating temperature.

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,
• the radiator having tubes with first and second ends, a first tank connected to the first ends of the tubes and having first and second ports and a baffle between the first and second ports to substantially limit the flow of coolant between the first and second ports except through the tubes, and a second tank connected to the second ends of the tubes and having a third port;
• 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;
• and
• a first valve in said cooling circuit for controlling coolant flow from said the second port of said radiator and said first bypass through said heat exchanger coolant flow path.