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#1
11-09-2009, 07:47 PM
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Ok, so it looks like what they put in the floor is just regular 1/2" pex tubing. There look to be 3 loops of unknown length.
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#2
11-09-2009, 08:08 PM
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I know you're trying to set this up on the cheap, but because the building is separate, I would still run a glycol mix through the system.
Even though you have a separate heat source, if the electricity goes out in below freezing temps....  The unknown is what effect the glycol will have on PEX made for domestic water supply. Also, I wasn't promoting solar in my previous post  , the link was for you to enter the values of the building and come up with a BTU loss number.There are other calculators if you google for "heat loss calculator" or "BTU loss calculator". Also, the crimping tools (rent or purchase) and hardware for a pressure test are all available at HD. Mitch
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#3
11-10-2009, 02:15 AM
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I don't thing the glycol shouldn't have any adverse afffect on the PEX tubing, the OxyPEX is the same material inside. The only issue is that you will get some O2 absorption which may increase the rate of corrosion. I couldn't say how big an issue that will be though.
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I retired and got a fixed income but it's broke. Ed _______________________________________ 50 gallon FOWLR, 10 gallon sump. 130 gallon reef, 20 gallon sump, 10 gallon refugium. 10 gallon quarantine. 60 gallon winter tank for pond fish. 300 gallon pond with waterfall.
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#4
11-10-2009, 08:47 AM
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I found this information from the DOW website:
Quote- Plastic Piping There has been a steady increase in the use of plastic tubing over the last 20 years. Polyethylene (PE) or cross-linked polyethylene (PEX) represent the most popular choices in terms of reliability and cost. Other materials such as chlorinated polyvinyl chloride (CPVC) or polyvinyl chloride (PVC) may also be used depending on operating temperatures. Several TES systems using either ethylene glycol- or propylene glycol based heat transfer fluids have operated successfully for years with no detrimental effect on their PVC piping. However, some PVC/CPVC suppliers recommend that propylene glycol-based fluids only be used in solutions no greater than 25%. In every case, regardless of the plastic being considered or the concentration of glycol desired, it is recommended that you consult the plastics supplier to verify compatibility with ethylene or propylene glycol fluids before installation. -end quote Here's the site: http://www.dow.com/heattrans/fsa/system.htm Mitch
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