Thermal Property Measurements of Stratigraphic Units with Modeled Implications for Expected Performance of Vertical Ground Source Heat Pumps

Geothermal Heat Recovery Complex: Large-Scale, Deep Direct-Use System in a Low-Temperature Sedimentary Basin (Final Report)

“…The work included a thorough analyses of existing hydraulic, thermal, and mechanical properties of the MSS in the ILB (Figure 22). The thermal, hydraulic, and petrophysical data (Table 2) were drawn from the literature-either measurements from the ILB (Leetaru, 2014;Freiburg et al, 2016;Panno et al, 2013;Anovitz et al, 2018;Ritzi et al, 2018) or from data for similar geologic materials (Freeze and Cherry, 1979;Morrow et al, 2017;Robertson, 1988;Schön, 2015;Waples and Waples, 2004;Walker et al, 2015). Geothermal-specific properties such as thermal conductivity, specific heat capacity, and thermal expansion coefficient were modeled from overall quartz content and temperature (Appendix B1).…”

Introduction to the Special Issue of Geotechnical and Geological Engineering Entitled: “Thermo-Hydro-Mechanical Behavior of Soils and Energy Geostructures”

“…Three papers were published on different aspects of geothermal heat exchangers in conventional applications (boreholes and horizontal trenches). Wu et al (2014) studied relationships between the thermal conductivity dryout curve for unsaturated soils and the performance of geothermal heat exchangers in horizontal trenches, Ozudogru et al (2014a) compared the performance of different numerical simulations to evaluate the response of geothermal heat exchangers in vertical boreholes, and Walker et al (2014) studied the impact of different stratigraphic units on the overall thermal response of a geothermal heat exchanger in a vertical borehole. Seven papers were focused on the thermal and thermo-mechanical response of energy piles.…”

“…The thermohydro-mechanical behavior of rocks under representative in-situ conditions is an important issue that can shape new energy storage applications (Mortezaei and Vahedifard 2015;Zhu and Arson 2014). Although comparatively mature, the behavior of geothermal heat exchangers can still be better understood to develop easier to use design methods and to consider the role of more complex stratigraphic conditions (Ozudogru et al 2014a, b;Murphy and McCartney 2014;Yu et al 2015;Walker et al 2014). Similarly, as different types of energy pile configurations are developed, thermal analyses that can be readily integrated into whole-building thermal design tools also need to be developed at the same time (Loveridge et al 2014).…”

Distributed Thermal Response Multi‐Source Modeling to Evaluate Heterogeneous Subsurface Properties

“…Because the thermal properties of soil, sediment, and rock vary with temperature, lithology, bulk density, moisture content, and other factors (De Vallejo and Ferrer 2011), it is necessary to quantify these variations. Field and laboratory measurements have been used to measure subsurface thermal properties (Walker et al 2015) but are generally time‐consuming and expensive. Distributed temperature sensing (DTS) system, a fiber optic‐based optoelectronic technology first applied in the petroleum industry (Bolognini and Hartog 2013), is suitable for high‐spatial resolution temperature data collection (Anderson 2005; Bense et al 2016).…”