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A cooling system is connected to a fuel cell stack which has a hydrogen inlet, an air inlet, a coolant inlet, a coolant outlet and an exhaust water outlet. The cooling system includes a heat exchange unit coupled to the coolant inlet and the coolant outlet, a coolant pump, and a blower for blowing a

A cooling system is connected to a fuel cell stack which has a hydrogen inlet, an air inlet, a coolant inlet, a coolant outlet and an exhaust water outlet. The cooling system includes a heat exchange unit coupled to the coolant inlet and the coolant outlet, a coolant pump, and a blower for blowing air through the unit. An evaporator is exposed to the blown air, and a conduit communicates exhaust water from the exhaust water outlet to the evaporator. The exhaust water evaporates in and cools the blown air. The evaporator may be a wick mounted on an exterior surface of the heat exchange unit. The evaporator unit may include water injectors which spray exhaust water into the blown air. The injectors are mounted between a blower and a radiator. A removable porous evaporator element is mounted between the injectors and the radiator.

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1. A cooling system for a fuel cell stack having a coolant inlet, a coolant outlet and an exhaust water outlet, the cooling system comprising:a heat exchange unit coupled to the coolant inlet and the coolant outlet; a blower for blowing air through the heat exchange unit; an evaporator unit having a

1. A cooling system for a fuel cell stack having a coolant inlet, a coolant outlet and an exhaust water outlet, the cooling system comprising:a heat exchange unit coupled to the coolant inlet and the coolant outlet; a blower for blowing air through the heat exchange unit; an evaporator unit having a wick member exposed to the blown air; and a conduit communicating exhaust water from the fuel cell stack exhaust water outlet to the evaporator unit, said exhaust water evaporating in the blown air and thereby cooling said air. 2. The cooling system of claim 1, wherein:the evaporator unit is mounted on the heat exchange unit. 3. The cooling system of claim 1, wherein:the heat exchange unit comprises a first tank communicated with the coolant outlet and a second tank communicated with the coolant inlet; and the evaporator unit is mounted on the first tank. 4. The cooling system of claim 1, further comprising:a water storage tank between the exhaust water outlet and the evaporator unit. 5. The cooling system of claim 1, wherein the evaporator unit comprises:a housing having a first housing portion, a second housing portion and a third housing portion; a blower mounted in the first housing portion for blowing air through the housing; the heat exchange unit being mounted in the third housing portion; a water spraying unit mounted in the second housing portion between the first housing portion and the third housing portion; and a water supply line for communicating exhaust water from the fuel cell stack to the water spraying unit, the water spraying unit spraying said exhaust water into air blown through the housing, said exhaust water evaporating and cooling said air. 6. The cooling system of claim 5, wherein the water spraying unit comprises:a plurality of water injectors spaced apart from each other. 7. The cooling system of claim 5, wherein the water spraying unit comprises:a plurality of water injectors spaced apart from each other and arranged in an annular array. 8. The cooling system of claim 5, further comprising:a porous evaporator member mounted in the housing between the water spraying unit and the heat exchange unit. 9. The cooling system of claim 1, wherein the evaporator unit comprises:a water injector receiving exhaust water via the conduit and spraying said exhaust water into said blown air. 10. The cooling system of claim 1, wherein the evaporator unit comprises:a water injector positioned between the blower and the heat exchange unit, the water injector receiving exhaust water via the conduit and spraying said exhaust water into said blown air; and a porous evaporator member mounted between the water injector and the heat exchange unit. 11. The cooling system of claim 1, wherein the evaporator unit comprises:a plurality of water injector positioned between the blower and the heat exchange unit, the water injectors being spaced apart from each other and receiving exhaust water via the conduit, each injector spraying said exhaust water into said blown air. 12. The cooling system of claim 1, wherein the evaporator unit comprises:an annular member mounted so as to be exposed to the blown air; and a plurality of water spray nozzles spaced apart and mounted on the annular member, the nozzles receiving exhaust water via the conduit and spraying exhaust water into the blown air. 13. The cooling system of claim 1, wherein the evaporator unit comprises:an annular member mounted so as to be exposed to the blown air, the annular member having a larger upstream end and a smaller downstream end with respect to a direction of blown air; an annular water supply tube receiving exhaust water via the conduit; and a plurality of water spray nozzles spaced apart and mounted on the annular member, the nozzles receiving exhaust water from the supply tube and spraying exhaust water into the blown air. 14. The cooling system of claim 13, wherein:the annular member is hollow; and the water supply tube is separate from and enclosed by the hollow annular member. 15. The cooling system of claim 13, wherein:the water supply tube comprises an annular bore formed in the annular member. 16. The cooling system of claim 13, wherein:the water supply tube comprises an annular bore formed in the annular member; and each nozzle comprises an orifice in the annular member, each orifice being communicated with the annular bore by a supply passage formed in the annular member. 17. The cooling system of claim 1, wherein the evaporator unit comprises:a water spraying unit mounted between the blower and the heat exchange unit; a porous evaporator member mounted between the spraying unit and the heat exchange unit; and a water supply line for communicating exhaust water from the fuel cell stack to the water spraying unit, the water spraying unit spraying exhaust water into air blown through the evaporator member, said exhaust water evaporating and cooling said air before it encounters the heat exchange unit. 18. A cooling system for a fuel cell stack having a coolant inlet, a coolant outlet and an exhaust water outlet, the cooling system comprising:a hollow housing; a heat exchange unit mounted in the housing and coupled to the coolant inlet and the coolant outlet; a coolant pump for circulating coolant through the heat exchange unit and the fuel cell stack; a blower for blowing air through the housing towards the heat exchange unit; a sprayer unit mounted in the housing between the blower and the heat exchange unit; and a conduit communicating exhaust water from the fuel cell stack exhaust water outlet to the sprayer unit, said exhaust water evaporating in the blown air and thereby cooling said air. 19. The cooling system of claim 18, further comprising:a porous evaporator member mounted in the housing between the sprayer unit and the heat exchange unit. 20. The cooling system of claim 18, wherein the sprayer unit comprises:an annular member mounted in the housing; and a plurality of spaced apart spray nozzles mounted on the annular member and communicated with the conduit. 21. The cooling system of claim 20, wherein:the annular member has an aerodynamic shape. 22. The cooling system of claim 18, further comprising:a plurality of radially extending support members which support the annular member within and spaced apart from the housing. 23. A cooling system for a fuel cell stack having a coolant inlet, a coolant outlet and an exhaust water outlet, the cooling system comprising:a heat exchange unit coupled to the coolant inlet and the coolant outlet; a blower for blowing air through the heat exchange unit; a porous evaporator member mounted adjacent to the heat exchange unit and exposed to the blown air; and a conduit communicating exhaust water from the fuel cell stack exhaust water outlet to the evaporator member, said exhaust water evaporating in the blown air and thereby cooling said air. 24. The cooling system of claim 23, wherein:the heat exchange unit has an upper coolant tank and a lower coolant tank; and a water distribution member is attached to a side of the upper coolant tank, the water distribution member having a plurality of weep holes formed therein, the conduit communicating exhaust water to the water distribution member, the evaporator member being mounted below the water distribution member so that exhaust water flows through the weep holes and into the evaporation member.