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![a) Active type solar water heater system; (b) Passive type solar water... | Download Scientific Diagram a) Active type solar water heater system; (b) Passive type solar water... | Download Scientific Diagram](https://www.researchgate.net/publication/363737402/figure/fig3/AS:11431281085672347@1663820734264/a-Active-type-solar-water-heater-system-b-Passive-type-solar-water-heater-system.png)