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Old 10-27-13, 10:32 AM   #1
ESharp
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Join Date: Apr 2012
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Default Drainback system design

Here’s a website I found pretty useful when designing and building my solar hot water system (Solar Water Heater Design). Dr. Ben is a strong proponent for drainback systems due to their simplicity compared to pressurized glycol loops. The site has a focus on larger commercial systems, but the drainback system design is very scalable and there are a lot of useful tid-bits that apply to all systems.

A few of the items I picked up were methods of piping larger systems (importance of reverse-return, and a single high point), piping slope does not have to be quite as steep as commonly thought for drainback, and the limits on the length of a bank of collectors.

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