Joey Arnold's posts

Posted by Joey Arnold on May 20, 2010 05:34 pm

#1 -  Renewable Energy > Technical Discussion: Solar Heating - Solar Thermal > Re: Overheat cutout setting
The best way to avoid overheating in the tank is to use the "high limit control" on your differential controller. Set the high limit on the solar controller to at least 10 degrees lower than the high limit on your storage tank. If the tank reaches its temperature limit, the pump will turn off and stop adding heat to the tank. Once the tank temperature has fallen below the high limit the system goes back to normal operation.

Joey - AltE
 

Posted by Joey Arnold on May 13, 2010 01:50 pm

#2 -  Renewable Energy > Technical Discussion: Solar Heating - Solar Thermal > Re: SHW & Existing Oil-fired Boiler w/storage tank
An 80g tank in Vermont needs about 1sqft of collector per gallon of tank. The link below is for an "IPV-80-80" system that uses a solar module and DC pump for controls and circulation. You might want to bump up to a 20W module in Northern areas instead of the 10W that comes with the package.

http://www.altestore.com/store/Solar-Water-Heaters/Climate-freezes-Closed-Loop-Systems/Closed-Loop-Systems-for-1-4-People/Closed-Loop-PV-Powered-w-Tank/AET-PV-w-80-Gal-Tank-80-SqFt-Collectors/p2325/

Joey - AltE
 

Posted by Joey Arnold on May 13, 2010 01:18 pm

#3 -  Renewable Energy > Technical Discussion: Solar Heating - Solar Thermal > Re: SHW & Existing Oil-fired Boiler w/storage tank
What you are describing is a very efficient and common setup to interface with an existing DHW or space heating system. The link below will take you to a possible system setup that could be plumbed to your 40g tank. The square footage of collector that would be required depends on your location/solar resource.

http://www.altestore.com/store/Solar-Water-Heaters/Climate-freezes-Closed-Loop-Systems/Closed-Loop-Systems-for-1-4-People/Closed-Loop-AC-Powered-w-Tank/Indirect-w-80-Gal-Tank-52-SqFt-Collectors/p8111/

The storage tank does have a 4500W back-up heating element in the top portion of the tank, but you can always leave it disconnected to avoid using it for supplementary heat.

Joey - AltE
 

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