1. Challenges for Designing Closed-loop Geothermal Systems Restricted (Penn State Only) Author: Liu, Sai Title: Challenges for Designing Closed-loop Geothermal Systems Graduate Program: Energy and Mineral Engineering (PHD) Keywords: Closed-loop geothermal systemHeat extractionDimensionless numbersPolymer compositesSealing material File: Login to Download Committee Members: Jeremy Gernand, Program Head/ChairJohn Wang, Major Field MemberArash Dahi Taleghani, Chair & Dissertation AdvisorFarshad Rajabipour, Outside Unit & Field MemberDerek Elsworth, Major Field Member