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SlimJim in COLD water
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Posted by Robert Gammon on Friday, 22 August 2008, at 6:10 p.m.
My conversation with a SlimJim user in Ohio has turned up an interesting fact on this system.
The original installer used RV ANTIFREEZE and TAP WATER to charge the ground loop. When a certified installer came out and measured the freeze point of the fluid, it was 27 degrees.
The certified installer purged the loop with deionized water to get rid of the old stuff and charged it with a proper mix of deionized water and a ground loop approved antifreeze. The freeze point of the new mix is 20F. This installer is a big fan of SlimJim and has installed several in the general area using this anitfreeze mix and reports excellent results with SlimJim.
Tap water will have effects on freeze point (and boiling point) of water due to the variable mineral content.
This is more of a cold weather issue as installs along the gulf coast will not see water temps below 55F in a properly sized pond.
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An exercise in Energy Smart, Not So Big living. www.OurCoolHouse.com - Ideas @OurCoolHouse.com
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This site is all about building a cool, energy efficient house, that makes maximum use of earth sheltered design, passive solar heating and cooling, geothermal exchange energy management, and right sizing of the house for it's designated use. The home's placement is on a south-facing hillside in Deep Creek Lake, Maryland. This site describes the design process, the technologies used and the expected results. We also have a comprehensive Links Page for anyone who is also interested in designing a similar project.