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and the control manometer for the decomposition pump are both located along the latter line. Loop 3. The gas recirculation loop is made up of a gear pump and a chamber contain ing two ultra-violet lights. As the name implies the gas from the battery case is being constantly recirculated through the ultra-violet light chamber. This serves to allow recombination of any free hydrogen with chlorine, A pressure sensing mano meter is used as a failure detector on this system. Loop 4. Chlorine is stored during charge by forming chlorine hydrate in the store. Water flows from the bottom of the store through a heat exchanger to cool it and then into a gear pump. The hydrate forms at the exit side of the pump and enters the store and accumulates on a filter cloth at the bottom of the store. Coolant is also pumped through a coil in the store to maintain its temperature during charge. On discharge warm electrolyte from the battery circulates in a coil at the bottom of the store to decompose the hydrate. CONTROLLER DESCRIPTION This section describes the automatic control (shown in Figure 26-2) and data acqui sition system (shown in Figure (26-3) as applied to the 1.4kWh titanium battery. The primary task was to provide the necessary circuitry to step the battery through a predetermined test profile. This included control of the test cycle and the various battery auxiliaries. The second, but equally important, requirement was to provide the monitoring and logic necessary to protect the battery from damage due to the failure of either a battery component or an auxiliary function. A third task was to provide for the logging of various battery data in a form that would allow imme diate access and long term data analysis. Automation Sequence* • The battery test profile describes the orderly sequence of events that occur during the charge and discharge cycle of the battery. The cycle controller phases are as follows: • STANDBY - Upon initial power, the control system enters the STANDBY mode. In an idle state, battery cycling is not initiated until manually switched to another phase in the cycle. • COOLDOWN - During COOLDOWN, the first step in cycle testing, the store is cooled to operating temperature. 26-3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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