A heat exchange system for use on an engine-powered watercraft includes a liquid cooling system for cooling the engine using a first heat exchanger and a water heating system using a second heat exchanger for heating water. Raw water from an external water source is passed through each heat exchanger. Water used to cool the engine coolant inside the first heat exchanger exits the watercraft. Water heated by the second heat exchanger is passed to either an intake conduit or at least one onboard accessory system for flushing thereof to kill aquatic invasive species. A valve inside the second heat exchanger opens to release heated water when the heated water reaches a temperature of at least 140 F. Heated coolant from the first heat exchanger passes through the second heat exchanger to transfer heat to the water inside the second heat exchanger.

Embodiments of a boat heat exchanger system of the present invention employable to cool a user device via heat transfer generally include an inlet pipe, an outlet pipe, and an inline pump, wherein the inlet pipe is fluidly connectable to an external aqueous fluid source. In one embodiment, a closed-looped system utilizing a heat exchange component of a contained external aqueous fluid source is provided. In another aspect, embodiments of a boat heat exchanger system of the present invention contain a close-looped system and generally include an inlet pipe, an outlet pipe, an inline pump, and an externally disposed heat exchanger, wherein an aqueous fluid is recirculated through the heat exchanger system. Methods of cooling user devices on a boat using embodiments of a boat heat exchanger system are provided.

A heat exchange system for use on an engine-powered watercraft includes a liquid cooling system for cooling the engine using a first heat exchanger and a water heating system using a second heat exchanger for heating water. Raw water from an external water source is passed through each heat exchanger. Water used to cool the engine coolant inside the first heat exchanger exits the watercraft. Water heated by the second heat exchanger is passed to either an intake conduit or at least one onboard accessory system for flushing thereof to kill aquatic invasive species. A valve inside the second heat exchanger opens to release heated water when the heated water reaches a temperature of at least 140 F. Heated coolant from the first heat exchanger passes through the second heat exchanger to transfer heat to the water inside the second heat exchanger.

Embodiments of a boat heat exchanger system of the present invention employable to cool a user device via heat transfer generally include an inlet pipe, an outlet pipe, and an inline pump, wherein the inlet pipe is fluidly connectable to an external aqueous fluid source. In one embodiment, a closed-looped system utilizing a heat exchange component of a contained external aqueous fluid source is provided. In another aspect, embodiments of a boat heat exchanger system of the present invention contain a close-looped system and generally include an inlet pipe, an outlet pipe, an inline pump, and an externally disposed heat exchanger, wherein an aqueous fluid is recirculated through the heat exchanger system. Methods of cooling user devices on a boat using embodiments of a boat heat exchanger system are provided.

A cooling apparatus for cooling a fluid by surface water includes more than one tubes for containing and transporting the fluid in its interior, the exterior of the tube being in operation at least partially submerged in the surface water so as to cool the tube to thereby also cool the fluid. The cooling apparatus also includes at least one light source for producing light that hinders fouling on at least part of the submerged exterior, and at least one optic unit for enhancing the distribution of anti-fouling light on the submerged exterior.

An engine includes a sacrificial protective pipe subjected to a sacrificial protective coating process, and a metal pipe connected to at least one of two ends of the sacrificial protective pipe. The engine includes a flow path component (an intercooler side cover, a fresh-water cooler side cover) connected to one of two ends of the metal pipe, the one not being connected to the sacrificial protective pipe, and a sacrificial protective material provided to the flow path component.

A sea water cooling system including a first fluid cooling loop coupled to a first side of a heat exchanger and to a thermal load, a second fluid cooling loop coupled to a second side of the heat exchanger and including a pump for circulating fluid through the second fluid cooling loop, and a controller operatively connected to the pump, wherein the controller is configured to monitor an actual temperature in the first fluid cooling loop and to adjust a speed of the pump based on the monitored temperature to achieve a predetermined temperature in the first fluid cooling loop. The system may be selectively operable in one of a plurality of operating modes, wherein in a first operating mode the pump operates based entirely on cooling demands of the thermal load, and in a second operating mode the pump operates to maintain a fluid pressure above a predefined pressure.

A sea water cooling system including a first fluid cooling loop coupled to a first side of a heat exchanger and to a thermal load, a second fluid cooling loop coupled to a second side of the heat exchanger and including a pump for circulating fluid through the second fluid cooling loop, and a controller operatively connected to the pump, wherein the controller is configured to monitor an actual temperature in the first fluid cooling loop and to adjust a speed of the pump based on the monitored temperature to achieve a predetermined temperature in the first fluid cooling loop. The system may be selectively operable in one of a plurality of operating modes, wherein in a first operating mode the pump operates based entirely on cooling demands of the thermal load, and in a second operating mode the pump operates to maintain a fluid pressure above a predefined pressure.

A sea water cooling system including a first fluid cooling loop coupled to a first side of a heat exchanger and to a thermal load, a second fluid cooling loop coupled to a second side of the heat exchanger and including a pump for circulating fluid through the second fluid cooling loop, and a controller operatively connected to the pump, wherein the controller is configured to monitor an actual temperature in the first fluid cooling loop and to adjust a speed of the pump based on the monitored temperature to achieve a predetermined temperature in the first fluid cooling loop. The system may be selectively operable in one of a plurality of operating modes accordance, wherein in a first operating mode the pump is operated based entirely on cooling demands of the thermal load, and in a second operating mode the pump is operated to maintain a fluid pressure above a predefined pressure.

Various methods and systems are provided for an exhaust gas recirculation system. In one example, an exhaust gas recirculation cooler includes an exhaust gas inlet and an exhaust gas outlet spaced from the exhaust gas inlet; a plurality of cooling tubes disposed between the exhaust gas inlet and exhaust gas outlet; and a baffle positioned proximate to the exhaust gas inlet and interposed between the plurality of cooling tubes and the exhaust gas inlet, where the baffle directs exhaust gas entering the EGR cooler through the exhaust gas inlet to the plurality of cooling tubes in a defined path.