<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div id="yiv967930585"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-size: 12pt; font-family: 'times new roman', 'new york', times, serif; "></div></div></div><div><span style="font-size: 12pt; ">As part of my PhD research I would like to run a comparison of several models of vertical bore ground heat exchangers to evaluate accuracy and run time. I have the DST model (Type 557), but </span>does anyone have a model of a ground heat exchanger that they would be willing to share? </div><div><br></div><div>Amanda Pertzborn</div><div>ajpertzb@wisc.edu</div><div>PhD Candidate</div><div>UW-Madison, Solar Energy Lab</div></div></body></html>