In situ determination of thermal conductivity of waste rock dump material

1997 ◽  
Vol 98 (3-4) ◽  
pp. 345-359 ◽  
Author(s):  
Y. Tan ◽  
A. I. M. Ritchie
Keyword(s):  
Thermal Conductivity ◽  
Waste Rock ◽  
Waste Rock Dump

A sensor to perform in-situ thermal conductivity determination of cometary and asteroid material

2007 ◽  
Vol 40 (2) ◽  
pp. 226-237 ◽  
Author(s):  
M. Banaszkiewicz ◽  
K. Seweryn ◽  
R. Wawrzaszek
Keyword(s):  
Thermal Conductivity

A Simple Method for Determination of Thermal Conductivity Coefficients of Thin Films

2001 ◽  
Author(s):  
Chi Hsiang Pan ◽  
Chien Li Tung
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Crystalline Silicon ◽  
Silicon Film ◽  
Simple Method ◽  
Active Devices ◽  
Analytical Expressions

Abstract In this paper, we present a simple method to determine thermal conductivity coefficients (TCC) of thin films with a compact characterization microstructure and by using common measuring apparatus. The microstructure can be fabricated by a simple surface micromachining technique and in situ along with active devices on the same chip. Analytical expressions are derived to calculate the thermal conductivity coefficients of thin films from the experimental data. Experimental results with a heavily n-doped LPCVD poly crystalline silicon film are used herein to demonstrate the effectiveness of the proposed method. The obtained thermal conductivity coefficient seems to decrease a little as temperature increase and the average is around 39 Wm−1 °C−1 at 400°C below.

First in situ determination of the ground thermal conductivity for boreholeheat exchanger applications in Saudi Arabia

2009 ◽  
Vol 34 (10) ◽  
pp. 2218-2223 ◽  
Author(s):  
Mostafa H. Sharqawy ◽  
S.A. Said ◽  
E.M. Mokheimer ◽  
M.A. Habib ◽  
H.M. Badr ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Saudi Arabia

scholarly journals Experimental determination of thermal conductivity of soil with a thermal response test

2012 ◽  
Vol 16 (4) ◽  
pp. 1117-1126 ◽  
Author(s):  
Milos Banjac ◽  
Maja Todorovic ◽  
Milan Ristanovic ◽  
Radoslav Galic
Keyword(s):  
Thermal Conductivity ◽  
Experimental Determination ◽  
Outer Part ◽  
Thermal Response ◽  
Heating System ◽  
Thermal Response Test ◽  
Response Test ◽  
In Situ Conditions

Optimal design of a borehole heat exchanger, as the outer part of a ground source heat pump heating system, requires information on the thermal properties of the soil. Those data, the effective thermal conductivity of the soil ?eff and the average temperature of the soil T0, enable us to determine the necessary number and depth of boreholes. The determination of thermal conductivity of the soil in laboratory experiments does not usually coincide with the data under in-situ conditions. Therefore, an in-situ method of experimental determination of these parameters, the so-called thermal response test, is presented in this paper. In addition to the description of the experimental procedure and installation overview, the paper describes methods based on theory and presents their basic limitations, through the presentation of experimental data.

In Situ Testing and Analysis of Thermal Properties of the Ground Formation in Jiangsu, China

2014 ◽  
Vol 933 ◽  
pp. 477-481
Author(s):  
Shuai Chen
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Resistance ◽  
Thermal Response ◽  
Geological Structure ◽  
Ground Source ◽  
In Situ Conditions ◽  
Thermal Conductivity Λ

Ground source heat pump (GSHP) systems exchange heat with the ground, often through a closed-loop, vertical, borehole heat exchanger (BHE). The performance of the BHE depends on the thermal properties of the ground formation, as well as soil or backfill in the borehole. The design and economic probability of GSHP systems need the thermal conductivity of geological structure and thermal resistance of BHE. Thermal response test (TRT) method allows the in-situ determination of the thermal conductivity (λ) of the ground formation in the vicinity of a BHE, as well as the effective thermal resistance (Rb) of this latter. Thermal properties measured in laboratory experiments do not comply with data of in-situ conditions. The present article describes the results of thermal properties of the BHE whose depth is 100m in Yancheng City, Jiangsu Province, China. As shown in these results, λ and Rb of borehole are determined as 1.84(W·m-1·K-1) and 0.121 (m·K·W-1) respectively.

Cylindrical probe with a variable heat flow rate: A new method for the determination of formation thermal conductivity

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Lev Eppelbaum ◽  
Izzy Kutasov
Keyword(s):  
Thermal Conductivity ◽  
Heat Flow ◽  
Flow Rate ◽  
Dry Density ◽  
Heat Flow Rate ◽  
Cylindrical Probe ◽  
Variable Heat ◽  
Variable Heat Flow

AbstractThe thermal conductivity of a geological formation is one of the important petrophysical parameters which are preferable to study in situ in geophysical well logs. A new technique for the determination of formation thermal conductivity has been developed. We assumed that formation dry density, porosity, and pore fluids saturations could be determined from core samples or cuttings. In this case the specific heat and density of a formation can be quantitatively estimated. It is also assumed that the instantaneous heat flow rate and time data are available for a cylindrical probe with a variable heat flow rate placed in a wellbore. A semi-theoretical equation describing the temperature of the probe’s wall is used to determine in situ the formation conductivity as a function of the temperature increase. The formation thermal diffusivity is also calculated. A field example is presented.

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