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Vertical Closed-Loop (Indirect, Secondary Fluid) Ground-Source Heat Pump Systems
Published in Vasile Minea, Heating and Cooling with Ground-Source Heat Pumps in Cold and Moderate Climates, 2022
The design tools for ground-source heat pump systems are usually based on input data such as the following: (i) local climate data; (ii) building hourly, daily, and/or monthly total heating and cooling loads accurately calculated using homemade or commercially available programs; (iii) building existing unbalanced thermal loads; (iv) ground/soil thermal properties (e.g., undisturbed temperature, thermal conductivity and diffusivity, and moisture content from laboratory data or in-situ tests); (v) proposed borehole field geometry (configuration); (vi) brine, pipe, and grout thermal properties; (vii) geothermal heat pumps’ nominal performance parameters expressed in terms of coefficients of performance and energy-efficiency ratios; and (viii) energy rating codes and budgetary limitations.
Effect of temperature and initial state on variation of thermal parameters of fine compacted soils
Published in European Journal of Environmental and Civil Engineering, 2019
A. Boukelia, H. Eslami, S. Rosin-Paumier, F. Masrouri
Soil thermal properties are required in some engineering applications such as the design of high-level radioactive waste disposals (Rutqvist, Wu, Tsang, & Bodvarsson, 2002), buried power transmission (De Lieto Vollaro, Fontana, & Vallati, 2011), energy geostructures (Brandl, 2006; Pahud, 2002) and thermal energy storage (Giordano, Comina, Mandrone, & Cagni, 2016; Navarro et al., 2016). The study of heat flow in soil is based on the thermal properties and temperature gradient. The thermal parameters governing the transfer of heat are the thermal conductivity (λ), which is the ability of the material to conduct heat, the volumetric heat capacity (C), which describes the ability of the material to store thermal energy while undergoing a given temperature change, and the thermal diffusivity (α = λ/C), which describes the ability of a material to conduct thermal energy relative to its ability to store thermal energy.
A design of experimental apparatus for studying coupled heat and moisture transfer in soils at high-temperature conditions
Published in Experimental Heat Transfer, 2020
M. Hedayati-Dezfooli, W. H. Leong
Heat pulse technique was established to allow for concurrent measurement of soil thermal properties such as volumetric heat capacity , thermal diffusivity , and thermal conductivity . The method of heat pulse is based on the theory of heat conduction through the soil away from the line heat source for a short time. Figure 9 illustrates a sample graph of temperature rise of a receiving needle vs. time .