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.

A marine propulsion device includes an electric motor, a propeller shaft, a lower case, a coolant circulation passage, and a pump. The propeller shaft is driven by the electric motor. The lower case houses the propeller shaft. Coolant to cool the electric motor flows through the coolant circulation passage. The coolant circulation passage includes a cooling passage, a first connection passage, a heat exchange passage, and a second connection passage. The cooling passage extends through the electric motor. The first connection passage is connected to the cooling passage and extends from the cooling passage toward the lower case. The heat exchange passage is connected to the first connection passage and extends through the lower case. The second connection passage is connected to the heat exchange passage and extends from the heat exchange passage to the cooling passage. The pump circulates the coolant through the coolant circulation passage.

A guide plate having depressed portions is provided between an array of heat exchanger tubes, herein after tubes, arranged horizontally side-by-side and a next lower array of tubes arranged horizontally side-by-side, and is positioned with the lowest parts of the depressed portions near crest portions of respective lower tubes. The guide plate conveys a liquid D on outer surfaces of respective upper tubes onto similarly positioned lower tubes even when the tubes move in a right-and-left direction. A falling film heat exchanger installed in a ship, an offshore structure or the like can avoid reduction in heat exchange performance, even when the ship or the like inclines and swings, by substantially evenly distributing and dropping a liquid onto the crests of the tubes and causing the liquid dropped from the tubes located in an upper array to fall onto the tubes located in the next lower array.

A boat drive including combustion engine located within the hull and a drive unit located outside the hull. The drive has a propeller shaft and an exhaust system with an exhaust duct and an outlet. The exhaust duct connects the engine to the exhaust outlet for carrying away exhaust gases from the engine and cooling water introduced into the exhaust duct. The exhaust outlet is arranged in the propeller shaft. A first exhaust release opening is arranged in the exhaust duct, between the engine and the exhaust outlet, so that during operation, a first fraction of the exhaust gases and cooling water is discharged through the first exhaust release opening, while a second fraction of the exhaust gases and the cooling water is discharged through the exhaust outlet. A device is provided for adjusting the first fraction that can be discharged through the first exhaust release opening.

A keel cooler assembly comprising a coolant tube including a plurality of turbulence enhancers for improving the heat transfer of the coolant without substantially increasing pressure drop of the coolant. In one embodiment, the turbulence enhancers are provided for generating turbulent wakes in the coolant for disrupting laminar boundary layers for improving heat transfer. In another embodiment, the turbulence enhancers are provided for generating and propagating turbulent vortexes in the coolant to enhance mixing of the bulk coolant for improving heat transfer. In other embodiments, turbulators, including inserts or impediments, are provided having various configurations and being arranged in predetermined patterns for enhancing turbulence of the coolant for improving keel cooler heat transfer efficiency without substantially increasing pressure drop.

A remotely controllable rescue vessel is provided that includes: a rigid lower hull portion; an inflatable upper hull portion coupled to the rigid lower portion; and a remotely controllable motor, configurable to drive the remotely controllable rescue vessel according to remote instructions.

A watercraft comprising a hull, a first attachment coupled to an exterior surface of the hull, a second attachment coupled to the exterior surface of the hull, and a closed-loop cooling system. The closed-loop cooling system includes a pump, a first channel at least partially formed by the first attachment, a second channel at least partially formed by the second attachment, the second channel in fluid communication with the first channel, and a coolant circulated through the first channel and the second channel by the pump.

The present invention includes an underwater vehicle power unit and method of operating the same comprising: a fuel and waste stack comprising one or more reactant or fuel storage bladders and one or more waste storage bladders; a heater; a reactor that generates hydrogen and waste; a hydrogen and waste separator; a back-pressure regulator; a hydrogen and liquid separator; a fuel cell; and a controller that controls the temperature of the heater, the flow of fuel into the reactor, the flow of hydrogen into the fuel cell, the flow of water that dilutes the fuel, the flow of waste from the reactor and/or the fuel cell into the one or more waste storage bladders.

The present invention includes an underwater vehicle power unit and method of operating the same comprising: a fuel and waste stack comprising one or more reactant or fuel storage bladders and one or more waste storage bladders that are volumetrically and gravitationally balanced during operation; a fuel reactor that generates hydrogen; a fuel cell capable of generating an electrical current when exposed to hydrogen; and a controller that controls the flow of fuel into the hydrogen generator, the flow of hydrogen into the fuel cell and the flow of waste from the hydrogen generator, and/or the fuel cell into the one or more waste storage bladders.

The present application provides a cooling shell, a chassis, a marine electric propulsor, and a cooling control method. The cooling shell includes a shell body and the shell body includes a fin portion, a heating component installation portion, and a cooling component installation groove. The heating component installation portion is formed on one side of the shell body in the first direction for installing the heating component. The cooling component installation groove is formed on the other side of the shell body for accommodating the cooling component. A connected flow channel is formed between the fin portion and the cooling component installation groove.