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Forum: Solar Heating

09-23-11, 07:57 PM

Replies: 67

Solar water preheater project based on builditsolar $1000 system

Views: 43,336

Posted By GaryGary

Hi, There are a few pumps that will do 20 ft...

Hi,
There are a few pumps that will do 20 ft vertical head on startup.

The Taco 009 is one -- I think the Grundfos 58-15 on the number 1 speed will also do it -- both good solid pumps. I use two...

Forum: Solar Heating

07-16-11, 09:47 PM

Replies: 67

Solar water preheater project based on builditsolar $1000 system

Views: 43,336

Posted By GaryGary

The SRCC site has the tested efficiency curve...

The SRCC site has the tested efficiency curve intercept and slope values for all the collectors they certify, including lots of flats and lots of evacs:
SRCC Ratings...

Forum: Solar Heating

06-30-11, 09:54 AM

Replies: 67

Solar water preheater project based on builditsolar $1000 system

Views: 43,336

Posted By GaryGary

Hi, Whether 4 or 5 inch total width is overkill...

Hi,
Whether 4 or 5 inch total width is overkill or not depends on the thickness of your aluminum. You need about 0.018 thick aluminum to have an efficient fin that is 6 inches wide. You can run...

Forum: Solar Heating

03-10-11, 05:30 PM

Replies: 67

Solar water preheater project based on builditsolar $1000 system

Views: 43,336

Posted By GaryGary

Hi, Don't really have an issue with requiring a...

Hi,
Don't really have an issue with requiring a back flow presenter just to be on the ultra safe side. But, the water in the combination drain back/storage tank gets hot enough often enough that...

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