Chlorine is widely used in swimming pools to control algae, kill bacteria and to oxidize organic matter. In this research, photovoltaic (PV) power was applied to an electrolytic cell to produce liquid chlorine using brine of sodium chloride. The amount of chlorine production depends on the electric charge and on the salinity level, and for a good matching system maximum charge is obtained if the load line intercepts the PV characteristic at high current as possible. Based on this property a simple rule of sizing the PV array may be based on the short circuit current. Detailed analyses were made to compare the system performance with and without a maximum power point tracker (MPPT). Results show that incorporating a MPPT would be advantageous to boost chlorine production. Field testing indicated that the variation in solar radiation and temperature matches well the need for chlorine production. The use of PV in salt-water chlorination is an effective way to semi-automate the chlorine supply to the swimming pool
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