Fig. 11. Effect of temperatures of cell stack and condenser on discharge characteristic. range of variation of feed rate of gaseous oxygen corresponding to the change of load current is constant. However, the feed rate of gaseous oxygen corresponding to a load current of 5 A drifts positively with discharge time. We suspect that this phenomenon is due to the drift of zero level of the thermal mass flowmeter. (7) The temperatures of coolant into the cell stack and of gaseous hydrogen leaving the condenser are not affected by the load current and are almost constant. 3.3 EFFECT OF TEMPERATURE OF CELL STACK ON DISCHARGE CHARACTERISTICS When the temperature of coolant into the cell stack (the temperature of the cell stack) is shifted from a standard operating temperature of 80 °C to a temperature of 78°C or 82°C, the terminal voltage as a function of discharge time is illustrated in Fig. 9. It is concluded that if a temperature of gaseous hydrogen leaving the condenser is maintained at 70.5 °C, the terminal voltage is affected very little by changing the temperature of coolant into the cell stack, although the terminal voltage elevates slightly when a temperature of coolant into the cell stack is shifted to 82 °C. In addition, such troubles as the asbestos matrices drying up, or the electrolyte solution leaking out behind the electrodes, were not found upon disassembling the cell stack.
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