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SYSTEMS

SYSTEMS. Passive – no moving parts Active – pump or blower operated Water Heating Home Heating Pool Heating. Types of Systems. Batch or ICS Thermosyphon Direct Pump open loop Drainback closed loop Antifreeze closed loop. Batch Water Heaters. Also called ICS

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SYSTEMS

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  1. SYSTEMS • Passive – no moving parts • Active – pump or blower operated • Water Heating • Home Heating • Pool Heating

  2. Types of Systems • Batch or ICS • Thermosyphon • Direct Pump open loop • Drainback closed loop • Antifreeze closed loop

  3. Batch Water Heaters • Also called ICS • Integral Collector/Storage • Batch water heaters are climate limited • Completely passive • Best value in mild climates

  4. All of the following systems are designed using medium temperature collectors with the exception of swimming pool systems

  5. Thermosyphon Systems • Passive no moving parts • Tank and collector separate • Climate limitations • Tank must be higher than collector • Also ICS units

  6. Active Solar Heating • Moving parts • No configuration limitations • Uses parasitic power unless PV powered • Needs control if AC powered

  7. Direct Pump Systems • Used in non freezing climates • Open system • Simple installation

  8. Recirculation – Bad ideas • Will freeze collectors in power outage or • When pump is not pumping or • When control malfunctions or • When it is cold and cloudy for extended periods

  9. Drain Back • Active System • Good freeze protection • Easy to install • Isolated freeze problems • Not easily adapted to PV power

  10. Drain Backs are unforgiving • Sloping collectors and piping • Insuring return tube can get air • Stacking pumps

  11. Drainback collectors should not be mounted in landscape orientation due to riser tubes sagging over the years

  12. Antifreeze Systems • Active system • Most freeze protection • Installation intensive • Adapts to PV Power – low powered pumps • Most maintenance

  13. More complex • Double wall exchanger • Expansion tank • Drain and Fill Valves • Pressure Gauge

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