Thermal Resistance Archives

Improving speed and precision of using guarded heat flow technique to measure thin specimens

Author(s): Dante J. Dorantes-Gonzalez, J. Liu, Q. C. Nie, Y. N. Li, Z. Chen

This paper introduces a compensation algorithm and a different-layers calibration method that will improve the temperature measurement speed and thermal resistance elimination of a guarded heat flow meter instrument. Without ...

Keywords: compensation algorithm, Contact resistance, different-layers calibration, GHF, Guarded heat flow meter, Steady state, Thermal Conductivity, thermal contact resistance, Thermal Resistance

Thermal Analysis of LED Heat Sinks by High-Vacuum Die Casting (HVDC)

Author(s): Rong-Yuan Jou

Lightweight LED heat sinks were fabricated by high-vacuum die casting (HVDC) using the aluminum alloy ADC12. Thermal characteristics of the heat sink were determined under natural convection using thermocouples and ...

Keywords: LED Heat Sinks, Thermal Conductivity, Thermal Resistance, TPS Technique, Transient Plane Source, Transient plane source (TPS) method

Thermal Load Calculations of Multilayered Walls

Author(s): B. M. Suleiman

This study was performed in an effort to improve the comfort and thermal design of Libyan houses by analyzing the current thermal resistance (R-values) of the most commonly used building ...

Keywords: building envelope, construction, Hot Disk TPS, insulation, masonry, multi-layered walls, seasonal temperature variation, Thermal Resistance

A simple dynamic measurement technique for comparing thermal insulation performances of anisotropic building materials

Author(s): Bulent Yesilata, Paki Turgut

The authors have presented a review of steady-state and transient measurement techniques for the determination of thermal conductivity, and have introduced a new method for the determination of thermal transport ...

Keywords: anisotropic, building materials, construction, Thermal Conductivity, thermal insulation, Thermal Resistance

Distributed Thermal Response Test on a Grouted U-pipe Borehole Heat Exchanger

Author(s): Marine Marcucci

The goal of this masters thesis was to better understand the factors affecting the performance of geothermal heat pumps. A new method (Distributed Thermal Response Testing) of determining the ground ...

Keywords: borehole, geothermal heat pumps, ground source heat exchanger, grout, Hot Disk TPS, Testing thermal conductivity of grout to model conditions inside of a borehole, Thermal Conductivity, Thermal Resistance

A numerical study on the theoretical accuracy of film thermal conductivity using transient plane source method

Author(s): Dan Dan, Hu Zhang, Ming-Jia Li, Wen-Quan Tao, Wen-Zhen Fang, Zeng-Yao Li

Currently, there is no research into the accuracy of the transient plane source (TPS) method for measuring the thermal conductivity of thin films. The purpose of this study is to ...

Keywords: Bulk material, bulk materials, Cement, films, heat conduction, Hot Disk, Sensor, sensor insulation, Thermal Conductivity, Thermal Resistance, thickness, thin film module, thin films, Transient plane source (TPS) method

Numerical investigation of the effect of interfacial thermal resistance upon the thermal conductivity of copper/diamond composites

Author(s): Fazal Ahmad Khalid, Kabeer Raza, Muhammad Zain-ul-abdein, Tarek Mabrouki

Diamond is an extremely conductive material that would be ideal for dissipating heat in microelectronics if it were not for its high price tag. In this study, cost effective copper- ...

Keywords: Coatings, Copper, Cu/D composites, Diamond, Hasselman-Johnson model, Hot Disk, Temperature, Thermal Conductivity, Thermal management systems, Thermal Resistance, thermal transport properties, Transient plane source (TPS) method, Volume

Influence of environmental factors on the adsorption capacity and thermal conductivity of silica nano-porous materials

Author(s): Hu Zhang, Ming-Jia Li, Wei Gu, Wen-Quan Tao, Wen-Zhen Fang, Zeng-Yao Li

Aerogels have a wide range of properties that make them effective thermal insulators. However, these properties are lost when the materials absorb too much water. The goal of this experiment ...

Keywords: Adsorption saturation capacity, Aerogels, Amorphous, Cell structure, composites, environmental, Exothermic, Hot Disk, Humidity, Pore Size, porosity, Scanning Electron Microscopy (SEM), Silica nanoporous materials, Temperature, Thermal Conductivity, thermal insulation, Thermal Resistance, Water vapor adsorption capacity

Analysis of flow and heat transfer characteristics of micro-pin fin heat sink using silver nanofluids

Author(s): Guodong Xia, Jian Li, Lei Chai, LiJun Zhou, MingZheng Zhou

Enhancing heat transfer in miniaturized radiators is an important goal for many researchers. In this study, silver nanofluids were employed to improve the transfer of heat in micro-pin fin heat ...

Keywords: Flow Rate, Heat Transfer, Micro-pin fin heat sink, Nanofluids, Nanoparticles, Polyvinylpyrrolidone (PVP), pressure, Silver, surfactant, Thermal Conductivity, Thermal Resistance, Transient plane source (TPS), Transient plane source (TPS) method, Ultrasound-assisted membrane reaction (UAMR), viscosity, Volume Fractions

Characterization of anisotropic and irregularly-shaped materials by high-sensitive thermal conductivity measurements

Author(s): H. Nagai, Mattias Gustavsson, T. Okutani

The transient plane source (TPS) technique has a wide range of applications because of its capability to test solids, liquids, powders, and anisotropic materials over a range of sizes. Thermal ...

Keywords: anisotropy, Bulk material, ceramics, Coatings, Complex geometry, films, heat flow, Hot Disk, metal, probe, Sensor, Single sided, Solids, Thermal Analysis, Thermal Conductivity, thermal contact resistance, Thermal Resistance, thermal transport properties, Thin, Transient hot-strip (THS), Transient plane source (TPS), Transient plane source (TPS) method

Keyword: Thermal Resistance