A thermoelectric generation-cooling system for enhancing heat dissipation: Optimization by Taguchi method with/without Thomson effect

Numerical simulation of nanostructured thermoelectric generator considering surface to surrounding convection

Taguchi optimization and analysis of variance for thermoelectric generators with forced convection air cooling

With rising need for enhanced vehicle performance, muffler designs must address heat dissipation effectively. Utilizing SP’s high thermal resistance and absorbent properties, the study evaluates heat transfer reduction through experimental and computational methodologies. This specific focus allows for a deeper investigation into optimizing heat shielding, a critical aspect of rider safety and muffler efficiency. A full factorial Design of Experiments (DOE) approach and the Taguchi method were employed to optimize material type, thickness, and operating temperatures. This research investigates the effectiveness of various materials and thicknesses of these materials in heat-shielding in two-wheeler mufflers at different temperatures. Results indicate that SP, with an optimal thickness of 2 mm and operating at 200°C, significantly reduces muffler surface temperature, providing a sustainable and efficient solution for two-wheelers. This demonstrates Sodium Polyacrylate’s superior performance compared to traditional materials like aluminized steel and stainless steel, which have higher thermal conductivity and lower temperature thresholds. Keywords: Heat shielding, muffler design, Sodium Polyacrylate, two-wheelers, Design of Experiments, Taguchi method, sustainable materials, thermal resistance

Optimization of a thermoelectric cooler-based system for dehumidification applications in terms of heat dissipation and water collection

The thermoelectric refrigeration system is an application of the Peltier effect, and good refrigeration performance is dependent on effective heat dissipation performance. To enhance the cooling performance of the thermoelectric system, this paper designs a new type of finned heat sink, which does not change the overall size of the thermoelectric system. The performance of the refrigeration system under the new fin is tested by experiments under various conditions. During the experiment, the cooling wind speed, the temperature of the hot and cold side of the TEC, the power consumption of the fan, and other parameters were directly recorded through the measuring instrument. The results show that the use of new finned heat sinks can improve the COP of the thermoelectric refrigeration system. Within the scope of the study, the thermal resistance of the new fins can be reduced by 42.6%, and the system COP value can be increased by 22.8%. In addition, increasing the cooling wind speed can further reduce the cold side temperature. Within the research range, the lowest temperature can reach −8.25 °C, but the power consumed by the fan is 166% of that of the conventional fin heat sink refrigeration device.

This project reports on improving the thermal performance of light-emitting diode (LED) packages based on an optimized thermal structure with a sprayed cuprous oxide coating. Eighteen orthogonal arrays of LED aluminum plates were used and the influence of the parameters of thermal dissipation structure on the LED junction temperature was established. The junction temperature of the LED assembly is developed by various heat dissipation structures based on Taguchi methods. The experimental results show that by measuring the temperature of the 12W LED module, the best results were compared with the lowest values in the overall experiment, where the junction temperature dropped from 67°C to 51°C Also, the contribution of the error to the total variance is about 0.8%, indicating that the experiment is quite successful and robust results. It was found that lower junction temperature values were obtained with optimized heat sink structures with Cu2O-coated Al substrates, and the thermal performance of the LEDs was further improved.

An electrical analogy model for performance evaluation of natural air-cooled TEG modules considering nonlinear effect of heat convection

Experimental investigation on combined thermal energy storage and thermoelectric system by using foam/PCM composite

To explore the distribution law of the temperature field in the motor pump and the influence of the fan-shaped DC channel with spoiler in the pump housing on its heat dissipation performance. This study takes the arc-gear type hydraulic motor pump as the research object. In COMSOL, a coupled heat transfer simulation model of the motor pump’s fluid-solid coupling is established, and the internal temperature field characteristics are analyzed. To improve the heat dissipation effect of the motor pump, it is proposed to arrange spoiler in the fan-shaped DC channel of the pump housing to enhance heat dissipation. Three types of spoilers, namely, wing-shaped, inclined rectangle-shaped, and wave-shaped, are designed. The simulation results show that when the motor pump operates under rated conditions, due to the poor heat dissipation environment inside the motor pump, the high-temperature areas of the motor pump are concentrated in the rotor and permanent magnet parts. After arranging the spoiler, the turbulent kinetic energy and vorticity in the fan-shaped DC channel of the pump housing are significantly enhanced. All three spoiler structures can reduce the maximum temperature of each component of the motor. According to the comprehensive performance evaluation criterion (PEC), the inclined rectangle-shaped structure has the best comprehensive heat transfer performance (PEC = 1.114), while the wave-shaped structure has higher heat transfer efficiency but greater pressure loss. The wing-shaped structure has relatively limited enhancement effect on heat dissipation. This study systematically quantifies the influence of different spoiler structures on heat dissipation performance and flow resistance characteristics, providing a solution for enhancing the heat dissipation of the motor pump.

In order to fulfil the current challenges for the European building sector, building design has diverged into two alternative directions: active technologies and passive design strategies. In the last few years, advanced and responsive building envelope components have represented a promising answer to these challenges. This paper presents the design and construction process of a project that aims to design, build and control the energy performance of an industrial-scale modular active ventilated facade prototype with a new Themoelectric Peltier System (TPS). The TPS is a thermoelectric HVAC heat pump system designed to be located in the building envelope and providing a high comfort level. Trying to optimize the energy performance of the traditional ventilated opaque facade, and make more efficient the energy performance of the TPS, the concept of adaptability has been applied to ventilated opaque facades. The essential research theme is to control the natural phenomena that take place inside the ventilated air cavity of the facade: taking advantage when heat dissipation is needed, and avoiding it when heat losses are not welcome. In order to quantify the previous statements, some facade prototypes are being built in Pamplona (Spain) and their energy performance is going to be analyzed during a year.

In order to fulfil the current challenges for the European building sector, building design has diverged into two alternative directions: active technologies and passive design strategies. In the last few years, advanced and responsive building envelope components have represented a promising answer to these challenges. This paper presents the design and construction process of a project that aims to design, build and control the energy performance of an industrial-scale modular active ventilated facade prototype with a new Themoelectric Peltier System (TPS). The TPS is a thermoelectric HVAC heat pump system designed to be located in the building envelope and providing a high comfort level. Trying to optimize the energy performance of the traditional ventilated opaque facade, and make more efficient the energy performance of the TPS, the concept of adaptability has been applied to ventilated opaque facades. The essential research theme is to control the natural phenomena that take place inside the ventilated air cavity of the facade: taking advantage when heat dissipation is needed, and avoiding it when heat losses are not welcome. In order to quantify the previous statements, some facade prototypes are being built in Pamplona (Spain) and their energy performance is going to be analyzed during a year.

Introduction The menstrual cycle and body temperature significantly influence sleep in women. This study focused on enhancing heat dissipation through physical exercise, examining the effects of resistance training (RT) on pre-bedtime and nighttime heat dissipation, as well as its impact on objective and subjective sleep evaluation during the follicular phase (FP) and luteal phase (LP). Methods The experiment involved 12 young women over four days, under the following four conditions: FP Non-Exercise Condition, FP Exercise Condition, LP Non-Exercise Condition, LP Exercise Condition. Participants engaged in 40 minutes of moderate-intensity RT during the day. Sleep EEG and skin temperature were recorded at home overnight, and participants completed a Visual Analogue Scale (VAS) assessment before and after sleep. The distal-proximal temperature gradient (DPG), a key marker of heat dissipation and sleep onset, was calculated from distal and proximal skin temperature differences. The study received approval from Saitama Prefectural University ethics committee. Results In the LP Exercise Condition, RT enhanced DPG both pre-bedtime and nighttime, accompanied by an increase in Stage N3 (p=0.028). Notably, Stage N3 sleep was sustained during the latter half of sleep, with concurrent increases in delta-power (p=0.043) and DPG (p=0.046). Subjectively, participants reported significant improvements in difficulty organizing thoughts and eye fatigue compared to the LP Non-Exercise Condition (p=0.039, p=0.041). Additionally, in the LP Exercise Condition, stronger heat dissipation before sleep correlated positively with feeling refreshed(r=0.829, p=0.042) and mood improvement (r=0.812, p=0.049), while showing a negative correlation with physical fatigue (r=-0.883, p=0.020). Furthermore, in the LP exercise condition, the higher the appearance rate of Stage N3, the more it showed a positive correlation with alertness (r=0.829, p=0.021), and a negative correlation with sleepiness (r=0.852, p=0.015) and difficulty organizing thoughts (r=0.802, p=0.030). Conclusion The findings suggest that daytime physical exercise during the luteal phase enhances heat dissipation before sleep and promotes deeper sleep, particularly SWS. These changes contribute to improved subjective evaluations upon waking, including reduced fatigue and improved mood. Thus, incorporating physical exercise during the luteal phase may serve as an effective strategy for improving sleep quality and post-sleep well-being in women. Support (if any)

In metal cutting, the extreme tool temperature restricts the material removal rate. To address this, it is crucial to adopt techniques that reduce heat input and enhance heat dissipation from the cutting tool inserts. Rake surface texturing, particularly with micro-pillars, is gaining popularity in this context. Direct measurement of the cutting tool temperature is exceptionally challenging, so a numerical approach is adopted in this work to inverse estimate the tool tip temperature based on the temperature measured at a distant location from the rake face. Stage I of the work involved the development of a circular micro-pillar array on tungsten carbide inserts using the Reverse Micro Electrical Discharge Machining (RµEDM) technique. Based on the discharge pulses recorded during RµEDM, the 110V–100 nF voltage-capacitance combination proved feasible for this operation. In Stage II, turning operations were performed on Ti6Al4V alloys under dry, compressed air, and wet conditions. The tool temperature measured at the distant location revealed a substantial temperature drop for textured tools. This is attributed to the reduced contact area at the interface, as observed from the rake morphology of the tools, and to the enhanced heat dissipation from the higher surface area of the developed textures, as revealed by the computational fluid dynamics-based numerical study in Stage III of the work. An array of closely spaced, small-diameter, and higher-depth micro-pillars beyond the tool-chip contact area could enhance heat dissipation from the cutting tools.

This study proposes a novel thermoelectric harvester design for asphalt pavements, incorporating thermoelectric generators and phase change material. Through simulation and experimentation, a system was developed using PCM as a cold storage unit to maintain subterranean cooling. The design comprises an asphalt base holder and top and bottom plates for heat capture and dissipation, respectively. The exposed top plate harvests solar heat, while the submerged bottom plate connects to an H-shaped cooling element and a PCM container. This configuration leverages subterranean cooling and facilitates a significant temperature difference between the TEG plates. Consequently, the experiment observed a maximum attainable temperature difference of 42.22°C with PCM compared to 14.39°C without PCM, translating to a three-fold increase in charging efficiency, as demonstrated by a 5 V supercapacitor fully charged within 2.6 h. This novel TEG design offers a promising approach for self-sustainable energy harvesting from asphalt pavements.

As a special wearable system, wearable air conditioner can enhance the human body’s ability to adapt to the environment. In the actual study, the heat dissipation unit of the wearable air conditioner is prone to radiation interference from nearby heat sources, thus affecting the refrigeration efficiency and resulting in power attenuation due to the adverse heat dissipation of the system itself. In this paper, kirchhoff’s thermodynamic principle is applied to study the microphysical state of black, white and mirror, and a theory of coating mode conduction or obstruction of heat radiation propagation is provided. As a kind of extension and enhancement of heat dissipation under non-Fourier’s Law in practical application, the cooling efficiency of wearable air conditioner can be improved to the greatest extent.