Pump Solar water heating

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the bubble separator of bubble-pump system


a bubble pump (also known geyser pump) suitable flat panel vacuum tube systems. in bubble pump system, closed htf circuit under reduced pressure, causes liquid boil @ low temperature sun heats it. steam bubbles form geyser, causing upward flow. bubbles separated hot fluid , condensed @ highest point in circuit, after fluid flows downward toward heat exchanger caused difference in fluid levels. htf typically arrives @ heat exchanger @ 70 °c , returns circulating pump @ 50 °c. pumping typically starts @ 50 °c , increases sun rises until equilibrium reached.








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