Vacuum Tube Solar Panels
High temperature water pump to boost pressure?
I need to fit a booster pump to increase pressure from a gravity fed vented solar water heater (uses vacuum tubes).
The problem is that the temperature of the water from the solar panel can be very high – in fact it could boil under some circumstances. It’s safe because the system is vented.
As the “solar” water feeds existing water heaters in the house, diluting the hot with some cold prior to the pump with an automatic mixer valve is not really an attractive option as we want to gather as much hot water as possible.
Can anyone tell me where to get a booster pump that can operate at up to 100 Deg C, delivering 2 bar pressure and about 25 liters per minute. Thanks.
Well, you have to have a mixer valve if your temps are over 140F
If I understand you correctly, you could put your mixer valve on the gravity fed hot water and then the output of the mixer valve goes to the inlet of a pump that can handle 140F. Then you don’t need a mixer on the hot water tank in the house. And finding a pump that can handle that temp will be a lot easier.
Also, storing high temp water is very inefficient. The higher the delta Temp is from the water to the ambient surroundings, then the lower the efficiency. You could save just as much energy in the water by increasing your water tank size and lowering your temp. For instance a 100 gallons of water close to boiling has the same stored energy as 150 gallons of 140F water. And you don’t need a mixer at that point and you don’t need a special pump either.
I’m assuming you are using storage on the roof with a thermosyphon? Can you add more water storage next to that one?
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