Alliant Energy Logo Alliant Energy Geothermal
Alliant Energy Geothermal Home Page

 

Call 1-800-723-7635, use our Contact Us form or e-mail .

Home  |  About Us  |  Contact Us  |  Sitemap  

How It Works - Closed-Loop Systems

Slinky Coils

Slinky Coils An increasingly popular approach, especially in residential systems, is a "slinky" coil.

A slinky is a coil of plastic tubing spread out and overlapped in a trench and buried. It concentrates the heat transfer surface into small volume, requiring less land area and shorter trenching - a big plus for homeowners.

A compact slinky will reduce trench length by about two-thirds compared to two pipes and four- and six-foot depths. An extended slinky will reduce trench length by about one-third. Specific design lengths will vary with the climate, soil and the heat pump's run fraction.

Slinky Example Slinky coils are installed horizontally at the bottom of a three-foot-wide trench.

Learn more about: Designing a Slinky Coil System

 
About Us Legal | Sitemap | Privacy