There are several types of closed loop designs piping used to a geothermal . what is this types of the pipes.?

What did you mean by type? is it the material or the manufacturing method??

1. In deep well systems, a piping loop extends several hundred feet underground.

    

2. Shallow loops are placed in long trenches, typically about6 feet deep and several hundred feet long. Coiling the piping into a "slinky" reduces the length requirements

    

3. For homes located on large private lakes, loops can be installed at the bottom of the lake,  usually decreases the installation costs and may improve performance.