Excessive Heat Dissipation Research Articles

Nanoscale Heat Transport of Vertically Aligned Carbon Nanotube Bundles for Thermal Management Applications.

Electronic devices continue to shrink in size while increasing in performance, making excess heat dissipation challenging. Traditional thermal interface materials (TIMs) such as thermal grease and pads face limitations in thermal conductivity and stability, particularly as devices scale down. Carbon nanotubes (CNTs) have emerged as promising candidates for TIMs because of their exceptional thermal conductivity and mechanical properties. However, the thermal conductivity of CNT films decreases when integrated into devices due to defects and bundling effects. This study employs a novel cross-sectional approach combining high-vacuum scanning thermal microscopy (SThM) with beam-exit cross-sectional polishing (BEXP) to investigate the nanoscale morphology and thermal properties of vertically aligned CNT bundles at low and room temperatures. Using appropriate thermal transport models, we extracted effective thermal conductivities of the vertically aligned nanotubes and obtained 4 W m-1 K-1 at 200 K and 37 W m-1 K-1 at 300 K. Additionally, non-negligible lateral thermal conductance between CNT bundles suggests more complex heat transfer mechanisms in these structures. These findings provide unique insights into nanoscale thermal transport in CNT bundles, which is crucial for optimizing novel thermal management strategies.

A comprehensive review and comparison of cooling techniques for photovoltaic panels: An emphasis on experimental setup and energy efficiency ratios

This study delves into exploring and comparing various cooling technologies for PV panels, with a special focus on revealing the harmful effect of excessive heat absorption on solar energy efficiency. Effective temperature management and dissipation of excess heat are essential to protect the integrity of PV panels and improve power generation. With a strong emphasis on the importance of experimental setups, this comprehensive research examines the methodologies and cooling methods used across a wide range of experimental studies, illustrating the complexities of data collection and analysis. Supported by schematic illustrations depicting various experimental setups, this study demystifies the complexities inherent in distinct PV cooling methods. Furthermore, the research extends beyond experimentation to include a comprehensive examination of the energy and economic aspects associated with various cooling technologies, including the calculation and presentation of energy efficiency ratios. It is worth noting that the results confirm the superiority of passive cooling techniques, including heat sinks (43 %), PCM (25), evaporation techniques (36 %), and spray cooling systems (54 %), in contrast to active cooling methods, as indicated by their net energy efficiency ratios. Passive cooling is advantageous for its low maintenance and cost-effectiveness, whereas active cooling, though effective in hot climates and enhancing PV efficiency, incurs higher initial costs and maintenance requirements. The novelty of this research lies in its detailed classification of cooling techniques and the specific materials used for each method, coupled with a thorough examination of the measuring tools employed. Furthermore, this study includes a comprehensive comparative analysis based on energy and economic aspects, alongside the advantages and disadvantages of each cooling technique. These invaluable insights hold the potential to revolutionize the development of efficient and dependable cooling strategies for PV systems, thereby elevating the feasibility and sustainability of solar energy as a pivotal cornerstone in our future energy landscape.

Thermal-Rectified Gradient Porous Polymeric Film for Solar-Thermal Regulatory Cooling.

Solar-thermal regulation concerning thermal insulation and solar modulation is pivotal for cooling textiles and smart buildings.Nevertheless, a contradiction arises in balancing the demand to prevent external heat infiltration with the efficient dissipation of excess heat from enclosed spaces. Here, a concentration-gradient polymerization strategy is presented for fabricating a gradient porous polymeric film comprising interconnected polymeric microspheres. This method involves establishing an electric field-driven gradient distribution of charged crosslinkers in the precursor solution, followed by subsequent polymerization and freeze-drying processes. The resulting porous film exhibits a significant porosity gradient along its thickness, leading to exceptional unidirectional thermal insulation capabilities with a thermal rectification factor of 21%. The gradient porous film, with its thermal rectification properties, effectively reconciles the conflicting demands of diverse thermal conductivity for cooling unheated and spontaneously heated enclosed spaces. Consequently, the gradient porous film demonstrates remarkable enhancements in solar-thermal management, achieving temperature reductions of 3.0 and 4.1°C for unheated and spontaneously heated enclosed spaces, respectively, compared to uniform porous films. The developed gradient-structured porous film thus holds promise for the development of thermal-rectified materials tailored to regulate solar-thermal conditions within enclosed environments.

A Molecular Dynamics Simulation Study of In- and Cross-Plane Thermal Conductivity of Bilayer Graphene.

Efficient thermal management of modern electronics requires the use of thin films with highly anisotropic thermal conductivity. Such films enable the effective dissipation of excess heat along one direction while simultaneously providing thermal insulation along the perpendicular direction. This study employs non-equilibrium molecular dynamics to investigate the thermal conductivity of bilayer graphene (BLG) sheets, examining both in-plane and cross-plane thermal conductivities. The in-plane thermal conductivity of 10 nm × 10 nm BLG with zigzag and armchair edges at room temperature is found to be around 204 W/m·K and 124 W/m·K, respectively. The in-plane thermal conductivity of BLG increases with sheet length. BLG with zigzag edges consistently exhibits 30-40% higher thermal conductivity than BLG with armchair edges. In addition, increasing temperature from 300 K to 600 K decreases the in-plane thermal conductivity of a 10 nm × 10 nm zigzag BLG by about 34%. Similarly, the application of a 12.5% tensile strain induces a 51% reduction in its thermal conductivity compared to the strain-free values. Armchair configurations exhibit similar responses to variations in temperature and strain, but with less sensitivity. Furthermore, the cross-plane thermal conductivity of BLG at 300 K is estimated to be 0.05 W/m·K, significantly lower than the in-plane results. The cross-plane thermal conductance of BLG decreases with increasing temperatures, specifically, at 600 K, its value is almost 16% of that observed at 300 K.

A Time-Domain Readout Technique for Neural Interfaces Based on VCO-Timestamping.

CMOS neural interfaces are aimed at studying the electrical activity of neurons and may help to restore lost functions of the nervous system in the future. The central function of most neural interfaces is the detection of extracellular electrical potentials by means of numerous microelectrodes positioned in close vicinity to the neurons. Modern neural interfaces require compact low-power, low-noise readout circuits, capable of recording from thousands of electrodes simultaneously without excessive area consumption and heat dissipation. In this article, we propose a novel readout technique for neural interfaces. The readout is based on a voltage-controlled oscillator (VCO), the frequency of which is modulated by the input voltage. The novelty of this work lies in the postprocessing of the VCO output, which is based on generating digital timestamps that contain temporal information about the oscillation. This method is potentially advantageous, because it requires mostly digital circuitry, which is more scalable than analog circuitry. Furthermore, most of the digital circuitry required for VCO-timestamping can be shared among several VCOs, rendering the architecture efficient for multi-channel architectures. This article introduces the VCO-timestamping concept, including theoretical derivations and simulations, and presents measurements of a prototype fabricated in 0.18-μm CMOS technology. The measured input-referred noise in the 300 Hz-5 kHz band was 5.7 μVrms, and the prototype was able to detect pre-recorded extracellular action potentials.

Thermal-Aware Task Scheduling and Resource Allocation for UAV-and-Basestation Hybrid-Enabled MEC Networks

Unmanned aerial vehicle (UAV)-enabled mobile edge computing (MEC) has recently emerged to provide services in the resource-shortage areas, e.g., rural and disaster rescue fields. However, to provide satisfactory services, especially for computation-intensive and time-sensitive tasks, UAVs are required to operate at their full capacity due to their limited computation resources. This may lead to excessive heat dissipation and damage computing units. To tackle this dilemma, this paper takes central processing unit (CPU) thermal constraints during UAV operating hours into consideration. To further relieve the burden on the UAV, we explore a hybrid MEC system with a base station and a hover-fly-hover UAV that is able to compute during flight. We aim to minimize the cruise duration of the UAV by jointly optimizing user admission policy, task scheduling, UAV hovering trajectory, traveling time, and computation-and-communication resource allocations. The formulated problem is complicated and we further divide it into four sub-problems which are alternating to be solved in sequence. Simulation results demonstrate that the proposed algorithm can achieve better performance than other baseline algorithms, and keep CPU temperature under control.

A review of green hydrogen production based on solar energy; techniques and methods

Abstract The study examines the methods for producing hydrogen using solar energy as a catalyst. The two commonly recognised categories of processes are direct and indirect. Due to the indirect processes low efficiency, excessive heat dissipation, and dearth of readily available heat-resistant materials, they are ranked lower than the direct procedures despite the direct procedures superior thermal performance. Electrolysis, bio photosynthesis, and thermoelectric photodegradation are a few examples of indirect approaches. It appears that indirect approaches have certain advantages. The heterogeneous photocatalytic process minimises the quantity of emissions released into the environment; thermochemical reactions stand out for having low energy requirements due to the high temperatures generated; and electrolysis is efficient while having very little pollution created. Electrolysis has the highest exergy and energy efficiency when compared to other methods of creating hydrogen, according to the evaluation.

Heat transfer distribution and pressure fluctuations during flow boiling in a pipe with different orientations

The effects of orientations have been studied for excessive heat dissipation as the vapor and liquid dispersion varies due to drastic variation in density. The heat transfer coefficient and pressure fluctuations are investigated with water as a working fluid at atmospheric pressure in flow boiling for horizontal, vertical up, and vertical down orientations for different mass flux and heat flux. A test-section made up of stainless steel (SS304) of 11.7 mm inner diameter and 0.5 mm thickness having 1.5 m length is used. The Froude number at the test-section outlet is varied from 0.078 to 0.6. The thermal imaging technique is used to visualize and plot the contours of the distribution of wall temperature. The centreline local and average heat transfer coefficient is comparatively higher for horizontal flow than vertical downflow and vertical upflow for the same mass flux and heat flux in flow boiling. However, the heat transfer is asymmetric for horizontal flow while symmetric for vertical up and downflow. For horizontal flow, the wall temperature is asymmetric for the Froude number less than 0.22 and vapor quality greater than 0.03. The pressure fluctuates more in horizontal orientation than the vertical orientation for two-phase flow.

Soft and Self‐Adhesive Thermal Interface Materials Based on Vertically Aligned, Covalently Bonded Graphene Nanowalls for Efficient Microelectronic Cooling

AbstractUrged by the increasing power and packing densities of integrated circuits and electronic devices, efficient dissipation of excess heat from hot spot to heat sink through thermal interface materials (TIMs) is a growing demand to maintain system reliability and performance. In recent years, graphene‐based TIMs received considerable interest due to the ultrahigh intrinsic thermal conductivity of graphene. However, the cooling efficiency of such TIMs is still limited by some technical difficulties, such as production‐induced defects of graphene, poor alignment of graphene in the matrix, and strong phonon scattering at graphene/graphene or graphene/matrix interfaces. In this study, a 120 µm‐thick freestanding film composed of vertically aligned, covalently bonded graphene nanowalls (GNWs) is grown by mesoplasma chemical vapor deposition. After filling GNWs with silicone, the fabricated adhesive TIMs exhibit a high through‐plane thermal conductivity of 20.4 W m−1 K−1 at a low graphene loading of 5.6 wt%. In the TIM performance test, the cooling efficiency of GNW‐based TIMs is ≈1.5 times higher than that of state‐of‐the‐art commercial TIMs. The TIMs achieve the desired balance between high through‐plane thermal conductivity and small bond line thickness, providing superior cooling performance for suppressing the degradation of luminous properties of high‐power light‐emitting diode chips.

Investigation into the effects of laser shock peening as a post treatment to laser impact welding

In this work, laser shock peening (or simply laser peening) is investigated for the first time as a post welding treatment for dissimilar foils joined via the fully-mechanical, high-velocity laser impact welding technique. Single and double laser peening shots were applied to laser-impact-welded foils using three different metallic material combinations. Subsequent lap shear testing showed that single-shot laser peening increased the average weld strength by 12% to 25%, depending on the flyer and target material combination. In contrast, with double-shot laser peening, the average weld strength decreased regardless of the flyer and target materials involved. Scanning electron microscope images revealed wavy weld interfaces and increased interlocking between the foils for the single-shot laser peening treatments as compared to the initial “flat” weld interface geometry, thereby leading to greater flyer/target weld strength. In the double-shot laser peening treatments, however, separations and melting were observed along the weld interface due to rebounding and excessive plastic heat dissipation of the foils. The findings of this study reveal the first insights and effects regarding the application of laser shock peening as a post-welding treatment beyond conventional fusion-based welding to high-velocity impact welding methods.

Implementation of Symmetric Functions Using Memristive Nanocrossbar Arrays and their Application in Cryptography

VLSI technology makes the integration of multiple electronic components into a single electronic chip possible but Moore has already predicted that further miniaturization of VLSI chips will cause excess heat dissipation. Because of this impediment faced by this technology, the scientists have turned their focus to nano-technological alternatives to keep up the continuous device improvement and continue with the miniaturization procedure without facing any hurdle from the aspect of heat dissipation and space and time complexity. Memristor can be such a nano-alternative, which has the potential of very rapid execution, miniaturization and very low power consumption compared to transistor-based technology. The main objective of this paper is to show an application of symmetric function in cryptography. In order to do so, first, three-input and five-input symmetric functions are implemented in memristor-based nanocrossbar circuits. Then a dynamic circuit of symmetric functions is implemented where the input voltages convert the circuit to three-input or five-input symmetric function circuit as and when required. The simulation results show the satisfactory behavior of our proposed design.

Phase Change Materials Reinforced with Aluminium Foam for Latent Heat Storage

The structure of aluminium foam is highly porous consisting of aluminium (or its alloy) filling up the space among gas pores. Although pores formed during foaming of aluminium melt are closed, there are always microscopic cracks in the walls of solid foam, so that the porosity is predominantly open. This preference of aluminium foam allows to fill pores with a Phase Change Materials (PCMs) capable repeatedly to store and release a huge amount of latent heat of phase transition from solid to liquid state and vice versa. The excellent thermal conductivity of the aluminium, forming the pore walls, predetermines aluminium foam castings for the production of highly efficient heat exchangers in various industrial sectors, especially in the building industry. The most promising technique for the production of near-net-shaped structural components containing a dense aluminium surface skin and porous inner foamed aluminium structure is powder metallurgical route. Lightweight self-supporting interior ceiling panels impregnated by PCM presented in this contribution, utilize their high mechanical stiffness and their ability to store large amounts of latent heat at a constant temperature. The application of foamed aluminium appears to be very promising also for heat exchangers covering the entire pitched roof of the building which provides not only the better recovery of the heat from the building surroundings but also the dissipation of unwanted excess heat from the interior when needed.

Implementing Chemostat Fermentation of Pichia Pastoris Producing Recombinant HBsAg to Optimize Cell Density Affected by Methanol Rate

High cell density fed-batch fermentation is the main strategy for recombinant hepatitis B surface antigen (rHBsAg) production. In this study, we employed short-term continuous fermentation to optimize the cell density of recombinant Pichia pastoris (P. pastoris). After reaching the maximum specified broth volume of 5 L in the fed-batch fermentation process, the operation mode was altered into the continuous mode with a dilution rate of 0.009 1/h. We used various values of methanol inflow to examine its impact as a limiting nutrient on cell density. After reaching the steady-state point, the continuous fermentation was stopped. The process's performance was evaluated based on titer, yield, productivity, and ease of process control. According to the results, the optimal methanol inflow in the pilot-scale fermentation process was 39.9 ml/h as the cell density increased from 363 g/l wet cell weight (WCW) in the fed-batch stage to 450 g/l WCW. We could successfully scale up the fermentation process with the biomass concentration of 450 g/l without having any major issues such as excessive heat dissipation or insufficient oxygen supply. This approach is a simple method for enhancing rHBsAg production efficiency in P. pastoris without requiring any new and complex facility.

Estimation of heat exchanges in Boer crossbred goats maintained in a climate chamber.

Exposure of goats to high air temperatures can induce physiological and behavioral adjustments, increasing the dissipation of excess body heat in the latent form, and intensification of the use of these thermoregulatory tools can result in physiological and productive damage to animals. With this, the objective of the research was to quantify the levels of thermal stress and the sensible and latent heat losses of Boer crossbred goats submitted to different air temperatures, in a climatic chamber. Six male crossbred goats of the Boer breed, with an average weight of 25.06±4.43kg and mean age of six months, were grouped using a completely randomized design, with three treatments (air temperatures of the 26, 30 and 34°C, respectively) and six replicates (animals) with 68% relative humidity. The temperature and relative humidity of the air were collected to calculate the temperature and humidity index (THI) and heat exchanges. Were collected the physiological responses rectal temperature (RT) and surface (ST) and respiratory rate (RF), with these data were estimated the heat exchanges by radiation (L), convection (Cr), total sensitive (Gs), latent of the respiratory tract (Er), cutaneous (Ec), total latent (Et) and total heat exchange (Wt). It was found that the THI values were classified as thermal comfort, moderate stress and very stressful, respectively, in the three conditions evaluated. With the increase in AT, the animals significantly increased (P<0.05) the RT, ST and RF, and consequently reduced sensitive heat exchanges, from 38 to 8%, and increased latent heat exchanges, from 62 to 92%, when compared air temperatures of 26 and 34°C, respectively. Physiological responses showed a significant negative (P<0.05) correlation with sensitive heat exchanges and a positive correlation with latent heat exchanges. In very stressful thermal conditions, the animals lost almost all of the excess metabolic heat by latent means (skin and respiratory tract).

A Low-Power BIST Scheme Using Weight-Aware Scan Grouping and Scheduling for Automotive ICs

Scan-based logic built-in self-test (LBIST) is widely used for supporting the in-system test in automotive systems. Although this technology has the advantage of low-cost testing, it suffers from low fault coverage and high switching activity during the test. This can lead to many undetected defects, excessive heat dissipation, and IR drop, inducing catastrophic risks to functional safety. Therefore, improving these two key factors is crucial to alleviate reliability problems in the automotive domain. Most previous works have focused on controlling the enormous toggling level of random patterns; however, one of the main disadvantages of these approaches is low fault coverage. Unfortunately, additional hardware costs associated with memory elements or test points are required for detecting the remaining faults. We propose a novel LBIST scheme based on weight-aware scan grouping and scheduling (WGS) to overcome these difficulties. Since the required test time of each automotive product is limited, the proposed scheme freezes the test time and focuses on improving both aforementioned factors significantly. Our approach divides scan cells into two categories: the coverage-efficient scan group and power-efficient scan group, and then it conducts weight-based scan cell reordering. Biased random patterns are fed to enhance fault coverage for the first category. For the second category, scheduling and disabling are performed to reduce switching activity. Finally, physical-aware reordering based on an inverter is performed to reduce routing overhead. Experimental results demonstrate the feasibility of the WGS methodology on the ITC’99 and OpenRISC benchmark circuits.

Temperature-Aware Virtual Data Center Embedding to Avoid Hot Spots in Data Centers

Virtual Data Center (VDC) embedding has drawn significant attention recently because of the growing need for efficient and flexible means of Data Center (DC) resource allocation. Existing studies on VDC embedding mainly focus on improving DCs' resource utilization. However, an important problem that has not been considered in VDC embedding solutions is the creation of hot spots by excessive heat dissipation and hot air generation from racks in DCs, which have significant adverse effects on energy consumption of the cooling system and IT equipment lifespan. To address this issue, we propose a temperature-aware VDC embedding scheme to avoid hot spots by minimizing the maximum temperature of hot air drawn to each rack. Meanwhile, we also aim to reduce the total power consumption of IT equipment in this scheme. A Mixed Integer Linear Programming (MILP) model and a heuristic algorithm are developed to implement the proposed VDC embedding scheme. Numerical results show that the proposed temperature-aware embedding scheme can significantly outperform a load-balanced embedding scheme in terms of maximum rack temperature, total power consumption of IT equipment, and VDC rejection ratio. Compared with a scheme that focuses only on maximizing IT resource utilization, which we refer to as IT-only energy-efficient scheme, our proposed scheme can significantly reduce maximum rack temperature and VDC rejection ratio while keeping the total power consumption of IT equipment close to that of an IT-only energy-efficient scheme.

Numerical Study of a Phase Change Material Integrated Solar Thermoelectric Generator

The numerical modelling of a phase change material (PCM) attached to a hybrid three-dimensional truncated compound parabolic concentrator and thermoelectric module is performed under transient and non-uniform variation in solar radiation. To demonstrate the higher performance of the system, the performance parameters of a stand-alone system (without PCM), SAS, and incorporated system (with PCM), IS, are modelled and studied using the ANSYS 2020 R1 software and MATLAB R2020a Simulink software. The PCM is placed at the hot junction of the solar thermoelectric generator (STEG) in order to act as a re-concentrating lens via the phase-change lensing effect and to decrease the adverse effect of transient and non-uniform solar radiation on the STEG. The results demonstrate an increase in the light transmissivity and refractive index of the PCM after melting and the efficacy of the PCM in shielding the STEG under extremely concentrated solar radiation intensities. The optimum heat input required to maximise the STEG efficiency and power output while minimising the challenge of excess heat dissipation in STEG systems is obtained and discussed. Finally, the results obtained show that the maximum temperature gradient, power output and efficiency from the stand-alone were higher than those from the incorporated system. The results obtained from this study will provide useful information in the design of STEGs under fluctuating meteorological conditions coupled with solar concentrators, which generate varying solar radiation.

Gelişmekte olan laminer akışta mini kanallı soğutucu bloğun çok yanıtlı taguchı yöntemi kullanılarak optimizasyonu

Excessive heat dissipation which adversely affects the working performance of electronic equipment is an important technological problem due to developing technology, increasing power and reducing dimensions. In this context, researches on the liquid-cooled mini-channel blocks are increasing. While it is expected that the cooling blocks is desired to have high heat transfer performance with a minimum pressure drop in terms of operating costs. This requires optimization of the geometric structure in the design of the cooling block. In this study, the design of a mini channel water cooled block to be used for the cooling of a chip, has been optimized with three different materials for high heat transfer performance and low pressure losses. The performance of the mini-channel cooling block, which is designed with different materials and different channel dimensions by utilizing the Taguchi orthogonal matrix, was investigated by using Computational Fluid Dynamics (CFD). As a criterion, the pressure loss and the maximum temperature at the base were taken into consideration. Since both criteria were taken into consideration, Multi Response Taguchi Analysis was used in the optimization. Temperature and pressure loss values were evaluated and optimized by the use of different weight values.

Dynamic Reconfiguration of Thermoelectric Generators for Vehicle Radiators Energy Harvesting Under Location-Dependent Temperature Variations

Conventional internal combustion engine vehicles generally have less than a 30% of fuel efficiency, and the most wasted energy is dissipated in the form of heat energy. The excessive heat dissipation is a primary reason of poor fuel efficiency, but reclamation of the heat energy has not been a main focus of vehicle design. Thanks to thermoelectric generators (TEGs), wasted heat energy can be directly converted to electric energy. All the heat exchangers, including vehicle radiators, gradually cool down the coolant or gas from the inlet to outlet. TEG modules are commonly mounted throughout the heat exchanger to fulfill the required power density and voltage. Each TEG module has a different hot-side temperature by the mounting location (distance from the inlet) and thus different maximum power point (MPP) voltage and current. Nevertheless, TEG modules are commonly connected in series and parallel, where both the ends are connected to a single power converter. As a result, the whole TEG module array exhibits a significant efficiency degradation even if the power converter has the MPP tracking capability. Although material and device researchers have been putting a lot of effort in enhancing TEG efficiency, such system-level issue has not been deeply investigated. This paper proposes a cross-layer, system-level solution to enhance TEG array efficiency introducing online reconfiguration of TEG modules. The proposed method is useful for any sort of TEG arrays to reclaim wasted heat energy, because heat exchangers generally have different inlet and outlet temperature values. This paper also introduces a complete design and implementation showcase of a reconfigurable TEG module building block. Experimental results show up to a 34% enhancement using the proposed method compared with a fixed array structure, which is a common practice.

되메움재 특성을 고려한 전력구 열환경 변화 예측 수치해석모델 개발

최근 전력구 지중 송전선의 허용 전류용량에 대한 정부규제로 인해 전력구 공사에 현장 되메움재의 열적 거동에 대한 연구가 중요해졌다. 점차 증대되는 고용량 전력공급에 대한 수요와 더불어, 허용 전류용량을 산정하기 위해, 전력 케이블 주변 온도 증가를 유발하는 요인을 예측하고 분석하는 것이 시급하다. 전력구 내부의 과도한 열확산으로 인한 지중 송전선로 주변의 온도 증가는 지중 송전선 자체의 열저항을 증가시켜 절연 파괴 및 열 폭주 현상을 야기한다. 따라서 전력구 설계 및 시공시, 되메움재에 따른 전력구 현장 열거동 메커니즘을 규명하는 것이 매우 중요하다. 본 논문에서는 현장 시험시공을 기반으로, 전력구내부와 주변지반의 온도 변화 및 열저항을 산정하기 위한 수치해석 모델을 개발하였다. 전력구 열거동 파악을 위한 수치해석은 현장시험 시공시 획득한 4개의 다른 종류의 되메움재의 열적 그리고 물리적 물성치를 기반으로 수행되었다. 또한, 실내 시험을 통해 산정한 각 되메움재의 열저항을 수치해석 모델에 입력변수로 적용했다. 전력구 내부에 일정한 열량이 공급될 때, 되메움재의 단위중량, 함수비, 열적 특성 등 여러 변수를 고려한 열거동 메카니즘을 모사할 수 있도록 열거동 수치해석 모델을 구성하고 1년 동안의 수행된 현장계측값과 비교를 통하여 개발된 수치해석 모델을 검증하였다. The thermal analysis of an underground power conduit for electrical cables is essential to determine their current capacity with an increasing number of demands for high-voltage underground cables. The temperature rises around a buried cable, caused by excessive heat dissipation, may increase considerably the thermal resistance of the cables, leading to the danger of "thermal runaway" or damaging to insulators. It is a key design factor to develop the mechanism on thermal behavior of backfilling materials for underground power conduits. With a full-scale field test, a numerical model was developed to estimate the temperature change as well as the thermal resistance existing between an underground power conduit and backfill materials. In comparison with the field test, the numerical model for analyzing thermal behavior depending on density, moisture content and soil constituents is verified by the one-year-long field measurement.