| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve power generation efficiency of a fuel cell by reducing the amount of energy consumed by operation of auxiliary equipment such as a pump for circulating a coolant. <P>SOLUTION: This is the fuel cell which is provided with hollow type cells 6 and a cooling device 7. The cooling device is provided with a cooling part 8 for directly cooling the hollow type cells, a coolant returning part 10 for forming a circulation passage together with the cooling part, and a heat exchanger 9 for cooling the coolant discharged from the cooling part. The cooling part has a flow passage including an up-flowing passage 8a where the direction has been decided from the gravity direction lower part side to the gravity direction upper part side, and the coolant returning part has the flow passage including a down-flowing passage 10a where the direction from the gravity direction upper part side to the gravity direction lower part side has been decided. The heat exchanger enables so that the coolant is circulated by utilizing natural convection in order that the coolant can be circulated through the flow passage in the coolant returning part naturally in the circulation direction using a downward force generated by the contraction caused by the heat deprived of by the heat exchanger. <P>COPYRIGHT: (C)2007,JPO&INPIT |
