Solar Loop is Full and Pump Circulating

Solar Loop Full and Pump Circulating.
Propylene Glycol: View of label of propylene glycol with ingestion, skin contact and eye contact information. This also shows the the mixing chart.  Propylene Glycol has many uses besides solar heat transfer loops.      * Solvent in the flavor concentrate and fragrance industry, an excipient in elixirs and pharmaceuticals, and a coupling agent in sunscreens, shampoos, shaving creams and other personal care products     * Wetting agent for natural gums to simplify compounding     * Humectant, preservative and stabilizer in diverse applications.     * Raw material to produce high-performance unsaturated polyester resins (UPR) used for marine construction, gel coats, sheet molding compounds and synthetic marble castings     * Chemical intermediate in the production of resins for paints and varnishes     * Solutions with water to make antifreeze, heat-transfer fluids and aircraft and runway deicing fluids     * Solvent in printing inks     * Solvent and enzyme stabilizer in laundry detergents     * Stabilizer in hydraulic fluids     * Plasticizers to improve the process-ability of plastics Propylene glycol is safer in two ways than ethylene glycol, the alcohol used in car antifreeze. One, it will not kill pets if they drink some that is spilled and two, it decomposes when it seeps into the ground or ground water faster than ethylene glycol.Propylene Glycol: View of label of propylene glycol with ingestion, skin contact and eye contact information. This also shows the the mixing chart. Propylene Glycol has many uses besides solar heat transfer loops. * Solvent in the flavor concentrate and fragrance industry, an excipient in elixirs and pharmaceuticals, and a coupling agent in sunscreens, shampoos, shaving creams and other personal care products * Wetting agent for natural gums to simplify compounding * Humectant, preservative and stabilizer in diverse applications. * Raw material to produce high-performance unsaturated polyester resins (UPR) used for marine construction, gel coats, sheet molding compounds and synthetic marble castings * Chemical intermediate in the production of resins for paints and varnishes * Solutions with water to make antifreeze, heat-transfer fluids and aircraft and runway deicing fluids * Solvent in printing inks * Solvent and enzyme stabilizer in laundry detergents * Stabilizer in hydraulic fluids * Plasticizers to improve the process-ability of plastics Propylene glycol is safer in two ways than ethylene glycol, the alcohol used in car antifreeze. One, it will not kill pets if they drink some that is spilled and two, it decomposes when it seeps into the ground or ground water faster than ethylene glycol.

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The system was some trouble getting out the air and the fluid circulating. We added a small automotive low pressure fuel pump to assist the solar pump. On the lower three way valve we shut the center valve and opened the other two. This forced the circulating air and fluid to pull from the 5 gallon open top bucket and discharge back into it. After a few times we got all the air out and liquid steady circulating. The flow meter showed around only 2 gpm. When the pump was turned to 3 it pumped the most. The Wilo pump shows that 1 is the fastest and 3 the lowest but my experience was the opposite. So after getting a steady stream we shut off the inlet and outlet valves and opened the center valve to allow the normal flow.

This system as it stands now has a capacity of 7 quarts of liquid.

The air purge valve had to be installed and the test blockoff removed. The air purge did purge the air, but it kept leaking liquid on the roof. So we replaced it with another spare air purge valve we had.

Another interesting fact about the solar controller SR868C8 is when the upper temperature sensor is not hooked up the pump wired to P1 circuit will not turn on. Now the pump will not turn on even if you go to the HND manual control mode. Here you can turn on each relay in the controller manually. Not so with P1 if there is no signal from T1 on the roof.

We installed 4 of the vacuum tubes before dark settled in. We sanded the evacuated copper tubes and applied a thermal - anti-seize paste Permetex #80078 Temperature Range, °C (°F)
-60(-51) to 870 (1,600).
The next day was a partly cloudy one and the controller was running the pump some with the collector showing 95°F the lower water tank 73°F and the upper water tank 83°F.

On February 6th We added 4 more vacuum tubes and insulated the pipes on the roof but not the ones inside yet.



Fill Apparatus: Fill Apparatus to Purge Solar LoopFill Apparatus: Fill Apparatus to Purge Solar LoopCollector sensor wiring: Wiring for the collector header only comes with about 6 feet of cable so we had to add about 30 feet of wire. Here is the kind oCollector sensor wiring: Wiring for the collector header only comes with about 6 feet of cable so we had to add about 30 feet of wire. Here is the kind oPurge Valve: Purge Valve on the headerPurge Valve: Purge Valve on the headerAir Purge Valve installed: Removed blockoff and permeantly installed the air purge valve vent at the highest point on the incoming pipe of the collector heAir Purge Valve installed: Removed blockoff and permeantly installed the air purge valve vent at the highest point on the incoming pipe of the collector heBlockoff on the Collector: Blockoff on the Collector header was temporarily installed so we could air pressure check the loop.Blockoff on the Collector: Blockoff on the Collector header was temporarily installed so we could air pressure check the loop.


Collector ready for Tubes: The collector now has the sensor installed and one piece of insulation.Collector ready for Tubes: The collector now has the sensor installed and one piece of insulation.Collector Temperature Sensor: Collector Temperature Sensor installed with HVAC sealer pad.Collector Temperature Sensor: Collector Temperature Sensor installed with HVAC sealer pad.Adding antisieze-thermal paste to each collector tube: Adding antisieze-thermal paste to each collector tube openningAdding antisieze-thermal paste to each collector tube: Adding antisieze-thermal paste to each collector tube openningInstalled first Tube: Jacob installed the first evacuated tube and tightening the cap.Installed first Tube: Jacob installed the first evacuated tube and tightening the cap.


Four Tubes Installed: Jacob tighening the fourth tube. Getting dark thats it for today.Four Tubes Installed: Jacob tighening the fourth tube. Getting dark thats it for today.
Holding the Solar ProjectHolding the Solar Project
Checking Collector Temperature: After installed the first four evacuated tubes we check all three sensors. The one on the roof shows 37°FChecking Collector Temperature: After installed the first four evacuated tubes we check all three sensors. The one on the roof shows 37°F