Borehole Thermal Performance Testing of HDPE vs. PEXa ... - IGSHPA
Borehole Thermal Performance Testing of HDPE vs. PEXa ... - IGSHPA
Borehole Thermal Performance Testing of HDPE vs. PEXa ... - IGSHPA
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<strong>Borehole</strong> <strong>Thermal</strong> <strong>Performance</strong> <strong>Testing</strong><br />
<strong>of</strong> <strong>HDPE</strong> <strong>vs</strong>. <strong>PEXa</strong> Pipe<br />
by<br />
Todd Giddings, Ph.D., P.G.<br />
<strong>IGSHPA</strong> Accredited Trainer<br />
www.toddgiddings.com<br />
<strong>IGSHPA</strong> Technical Conference<br />
October 5, 2011<br />
Tulsa, Oklahoma
<strong>Borehole</strong> <strong>Thermal</strong> Resistance is a Function <strong>of</strong>:<br />
• <strong>Thermal</strong> resistance <strong>of</strong> the loop piping material:<br />
<strong>HDPE</strong> and <strong>PEXa</strong> in this test<br />
• Size <strong>of</strong> the pipes in the borehole (D p & DR)<br />
• <strong>Borehole</strong> diameter (6” diameter in this test)<br />
• Spacing <strong>of</strong> the pipes in borehole:<br />
Between B & C, and with 3” spacers in this test<br />
• <strong>Thermal</strong> conductivity <strong>of</strong> the grout:<br />
1.0 hr-ºF-ft/BTU thermally-enhanced bentonite<br />
grout in this test<br />
A B C
(ft-ºF-hr/BTU)
A quotation from the conclusions in the Bowman Report:
Thank You !
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