Journal articles: 'Aluminum heat pipe'

1

Sun, Youhong, Xiaofeng Wang, Baochang Liu, Dali Ding, and Qingnan Meng. "Inverse solution to heat transfer coefficient during heat assembly of aluminum alloy drill pipes." Advances in Mechanical Engineering 9, no. 7 (July 2017): 168781401771497. http://dx.doi.org/10.1177/1687814017714970.

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With the rapid development of oil and gas industry, as well as geological exploration industry, the requirements on properties of aluminum alloy drill pipes are increasing. During heat assembly of aluminum alloy drill pipes, the cooling process inside the pipes has a direct impact on the connection performance of pipes. Thus, study of the convective heat transfer coefficient between the cooling water and the internal wall of aluminum alloy pipes is important. Conventional algorithms cannot easily solve the problem of determining the heat transfer coefficient at the complex structure of aluminum alloy drill pipes. Therefore, this article conducts a heat assembly experiment between aluminum alloy drill pipes and steel joints to obtain adequate, accurate temperature data. Based on these experimental data and an inverse heat conduction model, the heat transfer coefficients during the heat assembly process are determined by a finite element program and the differential evolution algorithm. The correlation curve between the cooling water flowrate and the convective heat transfer coefficient obtained in this article is important in the accurate prediction of heat transfer capacity and temperature field distribution during heat assembly at different cooling water flowrates. The analysis results show that the heat transfer coefficients are nonlinear functions of cooling water flowrates. The temperature is highest at location A1 and gradually declines backward along the axis of the drill pipe. The heat transfer coefficient gradually declines backward along the axis of the drill pipe. The increasing flowrate of cooling water will cause the convective heat transfer coefficient along the axis of the drill pipe to escalate irregularly.

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Sriram, V., and B. Kanimozhi. "Investigation of the Effect of Different Materials on Uniform Heat Distribution Over a Solar Collector Pipe." Journal of Computational and Theoretical Nanoscience 17, no. 5 (May 1, 2020): 2021–23. http://dx.doi.org/10.1166/jctn.2020.8842.

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Collector pipe used in solar power plant is a device for converting water from ambient temperature to the raised temperature which in turn used to rotate turbine blades. The raise in temperature is not that much when compared to thermal or nuclear power plant, so researches are going on for improving the heat carrying capacity of collector pipes. The productivity in pipe directly depends on the factors such as solar radiation incident on it, temperature distribution over the pipe, surrounding temperature, material of the pipeline used, and thickness of the pipe. When comparing to all of such parameters, the temperature distribution over the pipe is the main parameter which determines the performance of the collector pipe. For a particular type of solar collector pipe, the temperature distribution is function of length with day variation of solar incidence over it. In this work a collector pipe of length 2.2 m and 7 cm diameter is fabricated and tested under standard laboratory conditions for the uniform heat dissemination over the pipe. For keeping up the uniform temperature over the collector pipe, it is necessary to wound the pipe with metals like copper, aluminum. The results show that the heat distribution over the pipe is increased in case of copper when compared with aluminium.

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Take, Koichiro, and Ralph L. Webb. "Thermal Performance of Integrated Plate Heat Pipe With a Heat Spreader." Journal of Electronic Packaging 123, no. 3 (April 1, 2000): 189–95. http://dx.doi.org/10.1115/1.1348010.

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The air flow rate available for cooling of notebook computers is very limited. Thus, notebook computer manufacturers desire a “passive” cooling method. Heat pipes are typically used to transport the heat from the CPU to a forced convection, air-cooled condenser. This paper describes a passive, keyboard sized aluminum Integrated Plate Heat Pipe (IP-HP) that has been developed for notebook computers. Analysis was performed to estimate the several thermal resistances in the heat pipe, including the effect of the vapor pressure drop. The modified design using a heat spreader at the evaporator significantly reduces the heat pipe resistance. Further work was done to evaluate the thermal contact resistance at the IP-HP/CPU interface. Test results show that the IP-HP can reject 18 W while maintaining the CPU 65°C above ambient temperature.

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Zhu, Wen Feng, Jie Wang, Pei Jian Lin, and Bing Yang Zhang. "Numerical Simulation of Influence of Different Heat Source Models on Temperature Field of Aluminum-Alloy Ring Weld Seam." Applied Mechanics and Materials 456 (October 2013): 216–19. http://dx.doi.org/10.4028/www.scientific.net/amm.456.216.

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Ring-seam joint pipe is more and more widely used in advanced auto-body assembly. However, Aluminums higher conductivity, higher convection coefficient, oxidability and low plasticity in high temperature compared to convectional low carbon steel make its welding numerical simulation much more difficult. Thermal simulation is the fundamental of aluminums coupled calculations of thermo-elasto-plastic for welding. In this paper, a pipe joint of ring seam for ZL114 aluminum alloy is numerically modeled based on birth-death element method and moving-heat-source function loading method. The simulation results agree well with the experiments, which shows that the double ellipsoid heat source model is most suitable for MIG welding simulation of aluminum alloy.

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Cheng, Po Jen, David T. W. Lin, Chi Chang Wang, Wu Man Liu, and Chai Wei Chang. "Design of the Cooling Module of LEDs Based on the Aluminum-Acetone Flat Plate Heat Pipe." Applied Mechanics and Materials 764-765 (May 2015): 244–48. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.244.

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The waste heat generated by high power LEDs is hardly effectively dissipated, therefore, it results in a serious problem in the luminous efficiency. The most important issue of the LED research is to find a potential design of heat removal and solve the problem of LED over-heating. The purpose of this study is to design the LEDs combined with the cooling module of the aluminum-acetone flat plate heat pipe by the experiment for the high efficiency of heat removal. The aluminum-acetone flat plate heat pipe is innovative proposed by our team. The high power LEDs with and without heat pipe cooling module is compared. The heat removal efficiency of the cooling module of the aluminum-acetone flat plate heat pipe reaches 77% and drops the junction temperature of LED about 36 °C. The cooling module of the aluminum-acetone flat plate heat pipe has proven to be effective in solving the heat concentration problems associated with the LED chips. In short, the phase change cooling module will apply on the electronic component of high heat concentration for more effective cooling method.

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Howard, A. H., and G. P. Peterson. "Investigation of a Heat Pipe Array for Convective Cooling." Journal of Electronic Packaging 117, no. 3 (September 1, 1995): 208–14. http://dx.doi.org/10.1115/1.2792093.

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A combined experimental and analytical investigation was conducted to evaluate a heat pipe convective cooling device consisting of sixteen small copper/water heat pipes mounted vertically in a 4 × 4 array which was 25.4 mm square. The analytical portion of the investigation focused on determination of the maximum heat transport capacity and the resistance of the individual heat pipes. The resistance of each heat pipe was found to be 2.51 K/Watt, or more than 3 times smaller than the resistance produced by a solid copper rod with the same dimensions. The maximum predicted heat rejection for the module was over 50 Watts, or a power density in excess of 7.75 Watts/cm2. In the experimental portion of the investigation, two different modules were tested. The first module utilized ten circular aluminum fins mounted on the condenser end of each heat pipe to enhance heat rejection, while the second contained only the sixteen copper/water heat pipes. The effects of flow velocity, input power, and base plate temperature on the overall thermal resistance and the heat rejection capacity were determined, as well as the pressure drop resulting from each module. The finned heat pipe array was found to have a lower overall thermal resistance and thus, a higher heat rejection capacity, but also resulted in a significantly larger pressure drop than the array without fins. The results of the heat pipe array experiments were also compared with experimental and empirical results obtained from flow over a flat plate 25.4 mm square.

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Bai, Li, and Tan Liu. "Research on Different Heat Transfer Characteristics of the Dirt on the Pipe." Applied Mechanics and Materials 644-650 (September 2014): 5179–82. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.5179.

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In this study, the dirt adhered on the tubes of different materials (copper alloy tube, stainless steel pipe, polyethylene-aluminum composite pipe) were studied by the scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, PCR amplification, DGGE electrophoresis analyzers. Experimental results show that the microorganism in dirt on the copper alloy tube is mainly shuttle-type bacteria, and the distribution is dense. Stainless steel pipe’s dirt colony is assembling with long bacilli and cocci, polyethylene-aluminum composite pipe’s dirt is the large bacilli and density cocci. Three kinds of dirt in the pipe contains inorganic crystals with SiO2 and CaCO3, and the same type of element, but the content is differences, polyethylene-aluminum composite pipe have greater richness of microbial species, a copper alloy tube’s dirt is of little microorganisms.

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Kou, Zhi Hai, Min Li Bai, and Hong Wu Yang. "Thermal Performance of a Novel Flat Heat Pipe with Integral Micro-Grooved Wick for Energy Saving." Advanced Materials Research 648 (January 2013): 202–5. http://dx.doi.org/10.4028/www.scientific.net/amr.648.202.

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A novel flat heat pipe is put forward. The novel flat heat pipe is characteristic of its integral wick structure of microgrooves, which is made of a series of thin aluminum foils folded side by side. The thermal performance of the novel flat heat pipe under the different heat loads and incline angles has been investigated experimentally. It is found that the equivalent thermal conductivity of the novel flat heat pipe can be 12.3 times higher than that of the heat pipe material. Moreover, the novel flat heat pipe with integral micro-grooved wick has good temperature uniformity. The novel flat heat pipe can play a pronounced role in heat transfer enhancement, and be expected to be good candidates for thermal management of electronic devices.

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Kuo, Chun-Ching, and Huei Chu Weng. "Heat Transfer Enhancement in Gravity Heat Pipes Using AAO Nanostructure Generated on Condenser Section Inner Surface." Processes 9, no. 10 (October 14, 2021): 1827. http://dx.doi.org/10.3390/pr9101827.

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This study mainly focuses on the influence of anodic aluminum oxide (AAO) nanostructure generated on condenser section inner surface on the heat transfer performance of gravity heat pipes. AAO nanotubes were first grown by anodizing the inner wall surface of the condenser section of aluminum alloy gravity heat pipes through different anodizing voltages and treatment times. The nanostructure effect on the temperature distribution and overall thermal resistance was then investigated by using a thermal performance test system under different input heat powers. The experimental results showed that the generation of AAO nanostructure on the inner surface significantly enhances heat transfer performance; that is, the temperature difference between the evaporator and condenser sections and overall thermal resistance are reduced. Such an effect can be more significant in the case of a lower heat source. The percentage decreases in temperature difference and overall thermal resistance can be reduced by up to 58.83% and 58.79%, respectively, compared to the unprocessed heat pipe.

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Wu, Hai Bao, Ji Zhen Li, De Fu Li, De Gui Liu, and Guo Qiang Chai. "Microstructures and Properties of Spinning for Silicon Carbide Particle Reinforced Aluminum Composite." Materials Science Forum 944 (January 2019): 571–80. http://dx.doi.org/10.4028/www.scientific.net/msf.944.571.

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In this paper, 15% SiCp/2009A1 composites were subjected to multi-pass hot spinning experiments. The principle of the microstructure and properties of the materials was studied with the increase of thinning rate. The microstructures, interfaces, precipitates and their properties of the tube, which were in the states of spinning, spinning and solution heat treatment were analyzed and discussed.The research shows that it is possible to prepare spinning pipe with good shape and smooth surface by taking use of the spinning process of this paper. During the power spinning process, the force of the rotary wheel to the pipe causes the billet to produce two-way deformation, and the axial and tangential grains are obviously elongated and the flow line is formed.There are mainly Al, SiC, CuAl2and Mg2Si phases in the tube, and the spinning deformation does not change the phase composition of the composites, but the SiC distribution can be more uniform and the oxide film on the surface of the aluminum particles is broken, as a result that the oxygen element will cluster at the interface.The solution heat treatment after spinning can greatly improve the yield strength and tensile strength of SiC/Al composites with a slight decrease in plasticity. The spinning process used in this paper can not only form a composite pipe with a smaller diameter and thinner wall thickness, but it can still be applied when the diameter of the pipe blank becomes larger and the wall thickness becomes thicker.Through the research on spinning process and microstructure, the feasibility of spinning process for preparing aluminum matrix composites pipes was explored, which provided technical and theoretical support for the preparation and processing of Particulate reinforced aluminum matrix composites (PRAMCs) pipes for aviation and aerospace applications.

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11

Chen, Jian Mei, Yu Qiang Li, and Jia Qiang E. "Multi-Fields Coupled Simulation on Casting Process of Aluminum Alloy Based on Heat Conduction by Rotating Heat Pipe Bundle." Advanced Materials Research 621 (December 2012): 237–45. http://dx.doi.org/10.4028/www.scientific.net/amr.621.237.

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Based on the knowledge to defects and advantages of traditional ingot casting, a new approach for casting of aluminum alloy ingot, based on heat conduction by rotating heat pipes, is put forward in this paper. Different from the conventional casting method that cooling around ingot, the microstructure and properties of casting ingots can be significantly improved due to cooling of molten liquid from the central by rotating heat pipes proposed by this paper. Through simulation on the working process and the fields of flow and temperature, it can be speculatively seen that the ingot solidification is from inside to outside and that inner stress inside the ingot is compressive. The influences of speed of heat pipe bundle, casting speed and casting temperature on the temperature field in the ingot have been systematically studied. The ingots with different sizes can be prepared by changing size and structure layout of the heat pipes.

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12

Hu, Wenju, Peng Jia, Jinzhe Nie, Yan Gao, and Qunli Zhang. "A Fast Prediction Model for Heat Transfer of Hot-Wall Heat Exchanger Based on Analytical Solution." Applied Sciences 9, no. 1 (December 25, 2018): 72. http://dx.doi.org/10.3390/app9010072.

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The hot-wall heat exchanger (HWHE) has been widely used in thermal engineering fields such as ceiling radiant heating/cooling, refrigerator condenser, solar heat collection, and high-temperature heat recovery. However, the numerical simulation normally used for heat transfer prediction in HWHE is usually not as convenient as the analytic solutions in engineering applications. In this paper, a new heat transfer mathematical model of HWHE-based on analytic solutions was developed, which could be much faster to obtain the heat transfer properties of HWHE. The proposed model was validated under four conditions with literature values, which showed that the deviations of heat flux are 2.53%, 0.99%, 2.12%, and 1.96%, indicating its accuracy is satisfied. The model was then used to analyze the thermal property of HWHE. The results show the thermal resistance caused by panel with heat convection and conduction accounts for 96.54% of HWHE thermal resistance, and the thermal resistance caused by heat convection on the surface of panel is 74.43%. The analyzation results also show that adding aluminum foil around pipes could decrease HWHE thermal resistance by 5.11%. Besides, the influence of pipe diameters, pipe distance, pipe heat conductivity, side wall heat conductivity, and convective heat transfer coefficient on the heat transfer performance of HWHE was analyzed. The research in this paper can be used for fast prediction and optimization of heat transfer in HWHE.

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Zhang, Yue, Qi Dong Li, Tai Li Sun, and Xi Chuan Zhang. "Design and Testing of the Copper Pipe and Aluminum Pipe Welding Control System." Applied Mechanics and Materials 33 (October 2010): 84–87. http://dx.doi.org/10.4028/www.scientific.net/amm.33.84.

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The copper - aluminum pipe has been widely used in the refrigeration industry. And the welding quality becomes the focus. A PLC control system was developed to accurately control the resistance welding process of the Cu-Al pipe. The welding voltage was adjusted by a couple of silicon controlled rectifiers (SCR). To restrain the effect of network voltage fluctuation on the welding heat generation, it was obtained that the experimental relationship of the angle of flow and the network voltage, and fitted to a quadratic polynomial equation. Therefore, the control system can calculate the exactly the angle of flow value according to the current network voltage. The experiment results show that the error of the welding heat generation is limited in 5% when the network voltage fluctuates in the range of 380V ±10%. And the SEM and EDS analyzing results suggests that the welding seam length is more than 5mm, and there is hardly eutectic composition.

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Mohammed, Hussein, and Yasin Salman. "Laminar air flow free convective heat transfer inside a vertical circular pipe with different inlet configurations." Thermal Science 11, no. 1 (2007): 43–63. http://dx.doi.org/10.2298/tsci0701043m.

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Free convection heat transfer has been experimentally investigated for laminar air flow in a vertical circular pipe by using the boundary condition of constant wall heat flux in the ranges of local Rayleight number (RaL) from 1.1?109 to 4.7?109. The experimental setup was designed for determining the effect of different configurations placed at the inlet of a vertical heated pipe, on the surface temperature, the local and average heat transfer coefficients. The apparatus was made with an electrically heated aluminum pipe with length of 900 mm and inside diameter 30 mm. The inlet configurations included two circular pipes having the same diameter as the heated pipe but with lengths of 600 and 1200 mm, sharp-edge and bell-mouth. It was found that the surface temperature along the pipe surface for same heat flux would be higher values for inlet condition with length of 1200 mm and would be lower values for bell-mouth inlet condition. The results show that the local Nusselt number Nux and average Nusselt number (NuL) values would be higher for bell-mouth inlet condition and lower values for 1200 mm inlet condition. For all inlet configurations, the results reveal that the Nu increases as the heat flux increases. Empirical correlations have been proposed in a form of log NuL vs. log RaL for each case investigated and a general correlation for all cases has been obtained which reveals the effect of inlet conditions existence on the free convection heat transfer process in a vertical circular pipe. .

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Nakanishi, Eitoku, Masayuki Hyono, and Seijiro Maki. "Development of Axially Splitting Method for the Pipe Materials with the Cutting Tool." Advanced Materials Research 1017 (September 2014): 350–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.350.

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A simple processing method for splitting pipes in the axial direction using a cutting tool was investigated. The special tool developed in this study was pressed into the pipes in the axial direction, and the pipes were split very smoothly without any lubricant. This cutting method did not form fine chips, did not produce a significant heat effect on the inner wall surface. The splitting experiment was carried out with pipes constructed of aluminum and stainless steel. The outer diameters of the pipes were approximately 50 mm, and the thicknesses of the wall varied from 1 to 3 mm. The aluminum pipes were split very smooth by the tool, and curled strip-shaped chips were created by the splitting. On the other hand, the stainless pipes were greatly deformed, making them difficult to cut. Therefore, it was necessary to prevent deformation of the pipe by attaching an outer tool. The outer tool made it possible to cut stainless steel pipes.

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Wang, Rui, Yi Chun Wang, Chao Qing Feng, Huo Ming Zhan, and Hua Jun Li. "Performance Research on the All Aluminum Heat Exchanger of Family Air-Condition." Applied Mechanics and Materials 71-78 (July 2011): 2068–72. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.2068.

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Air enthalpy method is used in the contrastive experiment of the new condenser and the common wing-pipe heat exchanger of family air-condition. The refrigerating capacity and EER (Energy Efficiency Ratio) are obtained by the experiment. The conclusion of the experiment shows that the new condenser with small volume and diathermanous area can create more refrigerating capacity, but the total power consumption is basically unchanged, so the EER improved. This kind of all aluminum heat exchanger is the ideal substitute of family air-condition’s wing-pipe heat exchanger.

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Bai, Li, and Tan Liu. "Research of Dirt Growth Pattern Based on the Different Heat Exchanger Pipe." Advanced Materials Research 960-961 (June 2014): 353–57. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.353.

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This experiment wastewater treatment plant set up a device of researching different periods of dirt on the different heat exchanger tubes. The moisture test of dirt were derived from tubes of different materials (copper alloy tube, stainless steel pipe, polyethylene-aluminum composite pipe) is between 92.50% and 96.70%, This shows that the quality of per unit area of dry dirt to describe variation is feasible. The induction period of dirt on the copper alloy is between the 0d and 35d, the growth cycle is longer. In the mature period, the quality of per unit area of dry dirt is 2.031 mg/cm2. The induction period of dirt on the stainless steel is between the 0d and 20d, the growth cycle is shorter. In the mature period, the quality of per unit area of dry dirt is 2.627 mg / cm2. The induction period of dirt on the polyethylene-aluminum composite pipe is between the 0d and 35d, the growth cycle is shorter. In the mature period, the quality of per unit area of dry dirt is 2.863 mg/cm2.

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Lin, Bingyao, Rongjian Xie, and Leren Tao. "Study of the heat transfer performance of a loop heat pipe with aluminum wick." Thermal Science, no. 00 (2021): 248. http://dx.doi.org/10.2298/tsci200904248l.

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This study used aluminum (Al) powder as a raw material to fabricate a wick for loop heat pipes (LHPs) by the powder metallurgy method and took advantage of the excellent corrosion resistance, low density and low cost of Al. The average pore diameter, porosity and permeability of the Al wicks were 9 ?m, 47.65%, and 2.1?10-13 m-2, respectively. Then, to verify the feasibility of the Al wick, it was installed into a LHP to test the heat transfer performance. The experimental results showed that the LHP could transport a heating load of 130 W with a thermal resistance of 0.04 KW-1 under horizontal condition. A steady-state LHP mathematical model was developed, and the numerical results were compared with the experimental data. The results show that the model data are consistent with the experimental data, which means that Al wicks are suitable for use in the case of a high heating load and light weight.

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Anand, A. R., A. J. Vedamurthy, S. R. Chikkala, S. Kumar, D. Kumar, and P. P. Gupta. "Analytical and Experimental Investigations on Axially Grooved Aluminum-Ethane Heat Pipe." Heat Transfer Engineering 29, no. 4 (April 2008): 410–16. http://dx.doi.org/10.1080/01457630701825846.

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Jack, Steffen, Johannes Parzefall, Thomas Luttmann, Philipp Janßen, and Federico Giovannetti. "Flat Plate Aluminum Heat Pipe Collector with Inherently Limited Stagnation Temperature." Energy Procedia 48 (2014): 105–13. http://dx.doi.org/10.1016/j.egypro.2014.02.013.

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Xie, Kun, Yulong Ji, Chunrong Yu, Mengke Wu, and Hong Yi. "Experimental investigation on an aluminum oscillating heat pipe charged with water." Applied Thermal Engineering 162 (November 2019): 114182. http://dx.doi.org/10.1016/j.applthermaleng.2019.114182.

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Keshavarz Moraveji, Mostafa, and Sina Razvarz. "Experimental investigation of aluminum oxide nanofluid on heat pipe thermal performance." International Communications in Heat and Mass Transfer 39, no. 9 (November 2012): 1444–48. http://dx.doi.org/10.1016/j.icheatmasstransfer.2012.07.024.

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Jamin, Yorwearth L., and Abdulmajeed A. Mohamad. "Enhanced Heat Transfer Using Porous Carbon Foam in Cross Flow—Part I: Forced Convection." Journal of Heat Transfer 129, no. 6 (August 15, 2006): 735–42. http://dx.doi.org/10.1115/1.2717240.

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Cogeneration of heat and power has become standard practice for many industrial processes. Research to reduce the thermal resistance in heat exchangers at the gas/solid interface can lead to greater energy efficiency and resource conservation. The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins. The study measures the heat transfer rate and pressure drop from a heated vertical pipe, with and without porous medium, in forced convection. The largest increase in Nusselt number was achieved by aluminum fins, which was about three times greater than the best carbon foam case.

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Тюсенков, Антон, Anton Tyusenkov, Алексей Рубцов, Alexey Rubtsov, Камилла Мирхайдарова, and Kamilla Mirkhaidarova. "Pipe high-temperature strength research of pyrolysis furnace." Science intensive technologies in mechanical engineering 2018, no. 5 (April 19, 2018): 45–48. http://dx.doi.org/10.12737/article_5ad8d2928f4af3.41991916.

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The investigation results of the dependence of high alloy steel gas corrosion rate upon temperature are presented. Steel high corrosion-resistance is achieved at the introduction in steel alloy elements (chromium, aluminum, nickel). Steel 10C23N18 (a new sample and a sample from the furnace coil operated 6800h) and steel 10C17N13M2T at temperatures 500… 1000ºC were tested for heat-resistance.

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Cheng, Po-Jen, David T. W. Lin, Wu-Man Liu, Jui-Ching Hsieh, and Chi-Chang Wang. "THE STUDY OF AN INNOVATIVE HEAT REMOVAL MODEL OF THE ALUMINUM-ACETONE FLAT PLATE HEAT PIPE ON HIGH POWER LEDS." Transactions of the Canadian Society for Mechanical Engineering 39, no. 3 (September 2015): 739–48. http://dx.doi.org/10.1139/tcsme-2015-0059.

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It is well known that heat generation will be harmful to high power LEDs. It is hardly effectively dissipated and results in a serious problem in the luminous efficiency. The most important issue in LED research is to find a potential design of heat removal. The purpose of this study is to design the LEDs combined with the cooling module of the aluminum-acetone flat plate heat pipe by the experimental and numerical simulation for obtaining high efficiency in heat removal. The high power LEDs with and without heat pipe cooling module are compared. The numerical simulation is built and agrees with the experiment. The heat removal efficiency of the cooling module reaches 92.09% and drops the junction temperature of LED about 36°C. This cooling module has proven to be effective in solving the heat concentration problems associated with the LED chips. In short, the phase change cooling module will apply on the electronic component of high heat concentration for more effective cooling method.

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Supankanok, Rasa, Sukanpirom Sriwong, Phisan Ponpo, Wei Wu, Walairat Chandra-ambhorn, and Amata Anantpinijwatna. "Modification of a Solar Thermal Collector to Promote Heat Transfer inside an Evacuated Tube Solar Thermal Absorber." Applied Sciences 11, no. 9 (April 30, 2021): 4100. http://dx.doi.org/10.3390/app11094100.

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Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.

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Kondoh, Katsuyoshi, Takayoshi Ohji, and Keiji Ueda. "Optimum Heat Input Control in Arc Welding of Steel and Aluminum Pipe." Materials Transactions, JIM 39, no. 3 (1998): 413–19. http://dx.doi.org/10.2320/matertrans1989.39.413.

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Mirzaei, Mohsen, Mostafa Jafari Gishin, and Mohammad Abbaspour. "Numerical Simulation of Synthetic Heat Transfer in Laminar Nanofluid in a Horizontal Pipe." Advanced Materials Research 936 (June 2014): 409–14. http://dx.doi.org/10.4028/www.scientific.net/amr.936.409.

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In this study, the effect of solid-liquid volumetric ratio in laminar flow of nanofluid has been investigated numerically. The conservation equations are utilized in three dimensional elliptical forms for laminar and steady flow, and the effects of adding aluminum oxide nanoparticles to water based-fluid are studied. First, the influence of solid-liquid volumetric ratio on the secondary flow vortices, non-dimensional temperature is investigated for a flow with a fixed low Reynolds number and different Grashof numbers in a horizontal pipe. Then, the effect of variation in solid-liquid volumetric ratio on Nusselt number and convective heat transfer coefficient along the pipe is studied. The results of this study are in good agreement with the current literatures.

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Sharifi, Majid, Najmoddin Arab, and Gholamreza Khalaj. "Prediction of Toughness through Evaluation of Alloying Elements Distribution Pattern at Heat-Affected Zone in Submerged-Arc Welding Process of API X70 Steel." Applied Mechanics and Materials 467 (December 2013): 35–40. http://dx.doi.org/10.4028/www.scientific.net/amm.467.35.

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Six 56" × 19.8 mm, API X70 PSL2 pipes were produced from three different plate suppliers and then three samples in pipe transverse direction and perpendicular to welding seam were taken out from welding area of each supplier. Sampling carried out from weld metal, HAZ and base metal of each sample, then all 27 prepared samples were analyzed. Afterwards the amounts of 14 alloying elements were considered. The results showed that content of Carbon, Sulfur, Boron, Phosphorous, Copper, Manganese, Aluminum, Titanium and Molybdenum have been increased in the HAZ and Silicon, Nickel, Chrome, Vanadium and Niobium decreased. So it is predicted that an increase in Carbon, Aluminum, Phosphorous, Sulfur and Boron content, also a decrease in Silicon, Chrome and Nickel will cause a drop in the HAZ toughness and an increase in Titanium, Manganese, Copper and Molybdenum content, also decrease in Vanadium and Niobium will cause a rise in HAZ toughness.

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Zhang, Jing, Li-xian Lian, and Ying Liu. "Liquid phase enhanced sintering of porous aluminum for cylindrical Al-acetone heat pipe." International Journal of Heat and Mass Transfer 152 (May 2020): 119512. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119512.

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Peng, Hao, Juan Li, and Xiang Ling. "Study on heat transfer performance of an aluminum flat plate heat pipe with fins in vapor chamber." Energy Conversion and Management 74 (October 2013): 44–50. http://dx.doi.org/10.1016/j.enconman.2013.05.004.

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Berber, Adnan, Kazım Bagirsakci, and Mehmet Gurdal. "Investigation of effects on heat transfer and flow characteristics of Cr-Ni alloy and aluminum pins placed in AISI 304 tube." Thermal Science 24, no. 3 Part B (2020): 1999–2011. http://dx.doi.org/10.2298/tsci180421306b.

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In this study, the effects of cylindrical aluminum and Cr-Ni alloy pins placed in different arrangements on the inner wall of the pipe in the turbulent flow, the effects of heat transfer and flow characteristics on different Reynolds numbers have been experimentally investigated. The experiments were carried out under forced flow and constant heat flow conditions. Air is preferred as the fluid and the fluid velocity is adjusted between Reynolds number of 10000 and 50000. It has been observed that the Nusselt values obtained over the number of Reynolds number for the 5 different test tubes are arranged in a line from large to small, sequential row aluminum pin, sequential row Cr-Ni alloy pin, diagonal row aluminum pin, diagonal row Cr-Ni alloy pin, plain tube. There are also CFD analysis for each material, arrangements and pins geometry sets. On the other hand, it was determined that friction coefficient is directly proportional to the increase of heat transfer coefficient. As a result, it is observed that experimental results are compatible with both literature and numerical study.

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Vrublevsky, I. A., K. V. Chernyakova, E. N. Muratova, and N. V. Lushpa. "Investigation of Heat Flux Propagation in Heat-Conducting Oxide Substrates with Different Heat Conductivity by the Linear Heat Source Method." Journal of the Russian Universities. Radioelectronics 23, no. 3 (July 21, 2020): 53–61. http://dx.doi.org/10.32603/1993-8985-2020-23-3-53-61.

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Introduction. For controlled thermal management of power electronics devices, an important task is to increase the efficiency of heat removal from active components. Aim. To introduce a new approach to placing a linear contact-type heat source on the surface of thin samples in order to study the features of propagation of heat fluxes in oxide substrates from materials with different thermal conductivities. Methods and materials. The paper presents the results of studies of the propagation of heat fluxes in oxide substrates with different thermal conductivity (glassceramic and aluminum oxide ceramic - polycor). To generate the heat flux, a linear heat source was used, for which an electrically conductive carbon fiber was applied. Results. Thermograms and temperature distribution profiles were obtained at different periods of heating time on the surface of the substrate with a heating element and on its reverse side. It was shown that the placement of the linear heat source, implemented using an electrically conductive carbon filament, on the surface of the studied samples and time monitoring of thermograms from two opposite surfaces of the samples allowed to obtain data for evaluating the thermal properties of oxide substrates. The distribution of the heat flux in a homogeneous material near the generation point had the form of a cone of a heat pipe with a base on the surface with a heat source. The thermal cone for an aluminum oxide ceramic substrate had a larger angle of inclination than that in the case of glassceramic. Conclusion. The results obtained allowed to propose a method for reduction of thermal resistance of a heatconducting substrate by creating conditions for increasing the area of heat-conducting section.

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Tzeng, Sheng-Chung. "Spatial thermal regulation of aluminum foam heat sink using a sintered porous conductive pipe." International Journal of Heat and Mass Transfer 50, no. 1-2 (January 2007): 117–26. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2006.06.034.

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Fialko, N., A. Stepanova, R. Navrodska, and S. Shevchuk. "Efficiency of different types gas heaters for chimney anticorrosion protection systems of boiler plants." Energy and automation, no. 1(53) (December 28, 2020): 5–16. http://dx.doi.org/10.31548/energiya2021.01.005.

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The of researches results of exergy efficiency and optimization of parameters of different types gas heaters by used for anticorrosion protection of gas exhaust ducts of heating boiler plants equipped with exhaust gas heat recovery systems are presented. The choice of a complex technique for analyzing the efficiency of gas heaters, which makes it possible to obtain functional dependences of the selected efficiency criteria on the geometric parameters of the heat exchange surface of gas heaters for solving optimization problems is substantiated. Such a technique can be a technique based on exergy methods and statistical methods of experiment planning theory. This technique by an insignificant number of initial parameters required for calculation, and by the simplicity of calculation and analytical methods for obtaining exergy characteristics is characterized. The work considered three types of gas heaters: water-heating (water-gas) and two gas-heating (gas-gas) pipe and plate type. The heat exchange surface of the water-heating gas heater is assembled from transverse-finned bimetallic (steel base and aluminum fins) pipes, gas-heating pipe-type - from steel pipes with circular turbulators flow, and gas-heating plate-type - from smooth steel plates. The general system of balance equations used in this complex technique, and also its the basic stages, are presented. It is noted that the choice of complex criteria for assessing the efficiency of gas heaters is carried out according to the degree of sensitivity of the criteria to changes in the operating and geometric parameters of gas heaters. Using the proposed sensitivity coefficient, the degree of sensitivity of different efficiency criteria has been analyzed and it has been established that one of the most sensitive to changes in the geometric parameters of the heat exchange surface of gas heaters is the heat-exergy criterion. The results of the corresponding calculations for each of the three gas heaters are presented. It has been established the most exergetically effective is a water-heating gas heater, followed by gas-heating gas heaters, of plate and tube types respectively.

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Maddah, Heydar, Reza Aghayari, Morshed Farokhi, Shabnam Jahanizadeh, and Khatere Ashtary. "Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger." Journal of Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/920970.

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Heat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in shell side and tube side. The twisted tapes were made from aluminum sheet with tape thickness (d) of 1 mm, width (W) of 5 mm, and length of 120 cm. Titanium dioxide nanoparticles with a diameter of 30 nm and a volume concentration of 0.01% (v/v) were prepared. The effects of temperature, mass flow rate, and concentration of nanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regimeRe≥2300, and counter current flow were investigated. When using twisted tape and nanofluid, heat transfer coefficient was about 10 to 25 percent higher than when they were not used. It was also observed that the heat transfer coefficient increases with operating temperature and mass flow rate. The experimental results also showed that 0.01% TiO2/water nanofluid with twisted tape has slightly higher friction factor and pressure drop when compared to 0.01% TiO2/water nanofluid without twisted tape. The empirical correlations proposed for friction factor are in good agreement with the experimental data.

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Majdi, Hasan S., Hussein A. Alabdly, Muayad F. Hamad, Basim Obaid Hasan, and Mustafa M. Hathal. "Enhancement of Heat Transfer using Aluminum Oxide Nanofluid on Smooth and Finned Surfaces with COMSOL Multiphysics Simulation in Turbulent Flow." Al-Nahrain Journal for Engineering Sciences 22, no. 1 (March 24, 2019): 44–54. http://dx.doi.org/10.29194/njes.22010044.

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Both surface extension and nanofluid methods were used to enhance the heat transfer in a double pipe heat exchanger under turbulent flow conditions. Aluminum oxide nanoparticles were used with different concentrations(0.6-3 g/l)in hot water to increase the heat transfer rate on smooth tube and circular fins tube for a range of Reynolds number4240-19790. The simulation was also performed to predict the heat transfer coefficient and temperature profile for selected conditions in which COMSOL Multiphysics is used. The experimental results revealed that the heat transfer enhancement by both circular fin and nanofluid exhibited an increasing trend with Reynolds number and nanofluid concentration. The conjoint effect of Al2O3 of 3 g/l concentration and circular fin provided largest heat transfer enhancement of 53% for the highest Re investigated. Simulation results showed reasonable agreement with the experimental values of heat transfer coefficient. The simulation showed that the presence of nanofluid on finned surface influenced the temperature profile indicating the increased heat transfer rate.

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., N. K. Chavda. "EFFECT OF NANOFLUID ON HEAT TRANSFER CHARACTERISTICS OF DOUBLE PIPE HEAT EXCHANGER: PART-I: EFFECT OF ALUMINUM OXIDE NANOFLUID." International Journal of Research in Engineering and Technology 03, no. 12 (December 25, 2014): 42–52. http://dx.doi.org/10.15623/ijret.2014.0312006.

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Tomar, Vivek, Ernest Kin W. Tsang, and Danny H. W. Li. "Performance analysis of a prototype solar photovoltaic/wickless heat pipe embedded aluminum curtain wall-heat pump water heating system." Energy Conversion and Management 258 (April 2022): 115559. http://dx.doi.org/10.1016/j.enconman.2022.115559.

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Gunawan, Yohanes, Kukuh Tri Margono, Romy Rizky, Nandy Putra, Rizal Al Faqih, Imansyah Ibnu Hakim, Guntur Tri Setiadanu, Dedi Suntoro, Slamet Kasbi, and Subhan Nafis. "Enhancing the performance of conventional coffee beans drying with low-temperature geothermal energy by applying HPHE: An experimental study." Open Agriculture 6, no. 1 (January 1, 2021): 807–18. http://dx.doi.org/10.1515/opag-2021-0053.

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Abstract The unpredictable weather in Indonesia results in a less effective conventional coffee beans drying process, which usually uses solar energy as a heat source. This experiment aimed to examine the performance of the coffee beans drying using low-temperature geothermal energy (LTGE) with solar energy as the energy source. Heat pipe heat exchanger, which consists of 42 straight heat pipes with staggered configuration, was used to extract the LTGE. The heat pipes have 700 mm length, 10 mm outside diameter with a filling ratio of 50%, and added by 181 pieces of aluminum with a dimension size of 76 mm × 345 mm × 0.105 mm as fins. LTGE was simulated by using water that is heated by three heaters and flowed by a pump. Meanwhile, to simulate the drying process with conventional methods, a system of solar air collectors made of polyurethane sheets with a thickness of 20 mm and dimensions of length × width × height = 160 cm × 76 cm × 10 cm, respectively, was used in this study. Zinc galvalume sheet with 0.3 mm thickness was installed and coated by the black doff color throughout the inner of the container wall. The result showed that the drying process with LTGE and solar energy is faster than with solar energy or geothermal energy only. The drying coffee beans using the hybrid system can speed up the drying coffee beans time by about 23% faster than the solar energy only.

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Zhang, Shiwei, Jieling Chen, Yalong Sun, Jie Li, Jian Zeng, Wei Yuan, and Yong Tang. "Experimental study on the thermal performance of a novel ultra-thin aluminum flat heat pipe." Renewable Energy 135 (May 2019): 1133–43. http://dx.doi.org/10.1016/j.renene.2018.12.097.

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Zhang, Tao, Xue Feng Liu, Shan Shan Kong, Jia Jie Fan, and Zhen Di Zhang. "Preparation and Fundamental Research of Continuous Through-Porous Pure Aluminum Flat Pipes by Depoling Continuous Casting." Materials Science Forum 898 (June 2017): 1220–30. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1220.

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Continuous through-porous pure aluminum flat pipes were prepared continuously by a self-developed depoling continuous casting technology. An online measurement and control of mold temperature at free end of graphite core rods was realized, which was critical for the preparation. The quality of flat pipes was characterized. The results show that the flat pipes could be successfully prepared with the following process parameters: melt with temperature of 750 °C, cooling water with temperature of 20 °C and flow volume of 400 L·h-1, heat insulating mattress with thickness of 2 mm, mold temperature ranged from 635°C to 655°C and continuous casting speed ranged from 1 mm∙min-1 to 4 mm∙min-1. The flat pipe had cross-section dimensions of 14 mm×5 mm, which was aligned unidirectional pore diameter of 3 mm, pore number of 3 and smooth internal and external surface. The pore surfaces of flat pipes became smoother with the reduction of the graphite core rod surface roughness. When the surface roughness of graphite core rods was 0.531 μm and 0.124 μm, the corresponding surface roughness of pores was 0.581 μm and 0.184 μm, respectively. The mold temperature at the free end of graphite core rods was kept at a low thermal temperature range which was 5~25 °C lower than the solidification point of pure aluminum that is necessary for stable depoling continuous casting.

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Kamrava, Mohammad Hadi, and Farzad Bazdidi-Tehrani. "Computational Calculation of Thermal Efficiency in a Space Radiating Fin for Tow Different Materials." Applied Mechanics and Materials 110-116 (October 2011): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.23.

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In all industries which are related to heat, suitable thermal ranges are defined for each device to operate well. Consideration of these limits requires a thermal control unit beside the main system. The Satellite Thermal Control Unit (STCU) exploits from different methods and facilities individually or mixed. The space radiating fin which is combined with a heat pipe can be used to transfer the excess heat from the satellite to outer free space. The finite volume method is employed to simulate numerically the temperature distribution in a space radiating fin and evaluate thermal fin efficiency. Final results are achieved for two different materials (Aluminum and Beryllium) and compared to each other. The present results are compared with the other analytical methods and good agreement is shown.

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Hassan, Abdulsalam D. M., and Rwaa Alaa Hussein. "The Variation Effect of Collector Tilt Angle on the Heat Pipe Solar Collector Performance." Wasit Journal of Engineering Sciences 6, no. 2 (August 30, 2018): 21–27. http://dx.doi.org/10.31185/ejuow.vol6.iss2.88.

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The thermal performance of FPHPSC has been studied experimentally and theoretically. The collector consists of copper absorber plate, single glass cover, glass wool insulation and aluminum case, ten wickless heat pipes of 12.7 mm inner diameter. The experimental studies of collector performance have been performed on four different CTA (22°, 32°, 45° and 60°). The relation between the solar intensity and the collector energy losses are also discussed. The collector are tested under the climate condition of Kut city (32.602 latitude and 45.752 longitude). It is investigated that the increasing of CTA increase the efficiency of collector up to certain limit after that the efficiency decreases with the increasing of tilt angle of collector. A computer program which is based on VISUAL BASICE language (version 6) is made for the theoretical analysis. The experimental results agree reasonably with the theoretical predictions.

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Боташев, А. Ю., Р. А. Байрамуков, Н. У. Бисилов, and Р. С. Малсугенов. "STUDYING THE PROCESS OF HEATING OF A PIPE BILLET DURING GAS FORMING." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 4 (October 20, 2021): 156–61. http://dx.doi.org/10.36622/vstu.2021.17.4.022.

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Разработана и представлена схема нового устройства, осуществляющего штамповку деталей с нагревом трубной заготовки воздействием продуктов сгорания газообразной топливной смеси. В качестве топливной смеси может использоваться горючий газ - смесь воздуха с метаном или с пропан-бутаном. Представлены результаты исследования процесса нагрева трубной заготовки воздействием продуктов сгорания. Исследование проведено на базе уравнений конвективного теплообмена, теплового баланса и термодинамики. Получена зависимость для определения температуры нагрева трубной заготовки. Установлено, что температура заготовки зависит от материала и геометрических размеров заготовки, а также давления топливной смеси. Данное устройство обеспечивает нагрев до интервала горячей обработки стальных трубных заготовок диаметром более 150 мм при толщине стенки до 1,2…1,5 мм, а при диаметре более 300 мм - толщиной до 2,0…2,5 мм. Для нагрева трубных заготовок из цветных металлов и сплавов (например, алюминия и меди) требуется меньшее давление топливной смеси, чем для стали, благодаря этому обеспечивается нагрев заготовок значительно большей толщины, в частности, заготовок из алюминия толщиной до 6 мм We developed a diagram of a new device for stamping parts by heating a pipe billet by the action of combustion products of a gaseous fuel mixture. A combustible gas can be used as a fuel mixture - a mixture of air with methane or with propane-butane. We present the results of a study of the process of heating a pipe billet by the action of combustion products. We carried out the study on the basis of the equations of convective heat transfer, heat balance and thermodynamics. We obtained the dependence for determining the heating temperature of the pipe billet. We found that the temperature of the workpiece depends on the material and geometric dimensions of the workpiece, as well as the pressure of the fuel mixture. This device provides heating to the hot working interval of steel pipe billets with a diameter of more than 150 mm with a wall thickness of up to 1.2 ... 1.5 mm, and with a diameter of more than 300 mm - with a thickness of up to 2.0 ... 2.5 mm. To heat tubular billets made of non-ferrous metals and alloys (for example, aluminum and copper), a lower pressure of the fuel mixture is required than for steel, due to this, billets of a much greater thickness are heated, in particular, billets made of aluminum with a thickness of up to 6 mm

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Deng, Li, Xie, Wu, Wang, Yu, Li, and Zheng. "Heat Pipe Thermal Management Based on High-Rate Discharge and Pulse Cycle Tests for Lithium-Ion Batteries." Energies 12, no. 16 (August 15, 2019): 3143. http://dx.doi.org/10.3390/en12163143.

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A battery thermal management system (BTMS) ensures that batteries operate efficiently within a suitable temperature range and maintains the temperature uniformity across the battery. A strict requirement of the BTMS is that increases in the battery discharge rate necessitate an increased battery heat dissipation. The advantages of heat pipes (HPs) include a high thermal conductivity, flexibility, and small size, which can be utilized in BTMSs. This paper experimentally examines a BTMS using HPs in combination with an aluminum plate to increase the uniformity in the surface temperature of the battery. The examined system with high discharge rates of 50, 75, and 100 A is used to determine its effects on the system temperature. The results are compared with those for HPs without fins and in ambient conditions. At a 100 A discharge current, the increase in battery temperature using the heat pipe with fins (HPWF) method is 4.8 °C lower than for natural convection, and the maximum temperature difference between the battery surfaces is 1.7 °C and 6.0 °C. The pulse circulation experiment was designed considering that the battery operates with a pulse discharge and temperature hysteresis. The depth of discharge is also considered, and the states-of-charge (SOC) values were 0.2, 0.5, and 0.8. The results of the two heat dissipation methods are compared, and the optimal heat dissipation structure is obtained by analyzing the experimental results. The results show that when the ambient temperature is 37 °C, differences in the SOC do not affect the battery temperature. In addition, the HPWF, HP, and natural convection methods reached stable temperatures of 40.8, 44.3, and the 48.1 °C, respectively the high temperature exceeded the battery operating temperature range.

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Arifin, Zainal, Singgih Dwi Prasetyo, Aditya Rio Prabowo, Dominicus Danardono Dwi Prija Tjahjana, and Rendy Adhi Rachmanto. "Effect of thermal collector configuration on the photovoltaic heat transfer performance with 3D CFD modeling." Open Engineering 11, no. 1 (January 1, 2021): 1076–85. http://dx.doi.org/10.1515/eng-2021-0107.

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Abstract The shape and material of the collector configuration in photovoltaic thermal collectors (PVTs) are adjusted to alter the effectiveness of thermal conductivity. Good thermal conductivity between units plays an important role in heat absorption, and photovoltaic modules can increase electrical and thermal efficiency. In this study, a 3D computational fluid dynamics simulation of collector design in PVTs was carried out using Solidworks. The modeling was carried out on variations in the shape of boxes, pipe boxes, and triangle boxes with aluminum, copper, and mild steel materials on the thermal collector. The triangular box shape made of copper in the collector had a minimum temperature of 301.01 K when the heat generated was 1,000 W/m2 and the flow volume was 0.0005 m3/s. The difference in the heat generation rate and volume flow rate in each collector variation affects the collector temperature.

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Hassan, Abdulsalam D. M., and Rwaa Alaa Hussein. "The Effect of Cooling Water Mass Flow Rate Variations on the Heat Pipe Solar Collector Performance." Wasit Journal of Engineering Sciences 5, no. 2 (May 9, 2017): 31–41. http://dx.doi.org/10.31185/ejuow.vol5.iss2.56.

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The thermal performance of FPHPSC has been studied experimentally and theoretically. The collector consists of copper absorber plate, single glass cover, glass wool insulation and aluminum case. Ten wickless heat pipes of 12.7 mm inner diameter. The experimental studies of collector performance have been performed on four different CWMFR (0.03, 0.04, 0.05 and 0.06) kg/s. The relation between the amount of useful heat, instantaneous collector efficiency and solar intensity is discussed. The collector are tested under the climate condition of Kut city (32.6 latitude and 45.7 longitude). It is investigated that the increasing of CWMFR increase the efficiency of the collector. The percentage increase in the efficiency of the solar collector is in order of (13%), when the cooling water mas flow rate changes from 0.03 kg/sec to 0.06 kg/sec at (45o) collector tilt angle. A computer program based on VISUAL BASIC language (version 6) used for the theoretical analysis. The experimental results are in agreement reasonably with the theoretical predictions.

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Napitupulu, Farel H., Tekad Sitepu, Jefry Kusuma, and Agus Wijaya. "Rancang Bangun Alat Penukar Kalor Shell And Tube Dengan Satu Laluan Cangkang Dan Dua Laluan Tabung Sebagai Pemanas Air." Talenta Conference Series: Science and Technology (ST) 1, no. 2 (December 20, 2018): 115–34. http://dx.doi.org/10.32734/st.v1i2.289.

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Limbah air panas yang dibuang langsung tanpa diproses pasti akan mengakibatkan efek buruk terhadap ekosistem air. Dalam penelitian ini bertujuan untuk membuat suatu rancang bangun alat penukar kalor yang memanfaatkan energi panas dari limbah air panas pabrik pupuk yang bertujuan untuk memanaskan air dan akan digunakan sebagai air panas di pemandian perumahan karyawan pabrik pupuk. Dengan memanfaatkan energi panas dari limbah air panas tersebut maka temperatur limbah air panas ini juga akan turun dan selanjutnyadapat dibuang ke sungai tanpa membahayakan ekosistem di sungai. Secara ringkas, didapat alat penukar kalor berukuran panjang 1,64 m, lebar 0,48 m , dan tinggi 2,1 m , Panjang total pipa pada alat penukar kalornya adalah 2,7 m berdiameter 13mm , dan shellnya mempunyai panjang 1,35m dan berdiameter 70mm, volume pada tangki Alat penukar ini sebesar 27 Liter. Pada tabung dalam APK shell and tube, material yang digunakan adalah tembaga dengan nilai konduktivitas sebesar 385 W/mK sedangkan pada APK tabung sepusat, material yang digunakan adalah aluminium dengan nilai konduktivitas sebesar 205 W/mK. Sedangkan efektifitas terbesar setelah dilakukan percobaan adalah 35,4040%. Hot water waste that is discharged directly without being processed will definitely have an adverse effect on the water ecosystem. This study aimed to make a design of heat exchanger that utilized heat energy from hot water waste of fertilizer factories to heat water and produce hot water for the housings of the fertilizer factories. By utilizing heat energy from the hot water waste, the temperature of the hot water waste would also drop and it could be discharged into the river without endangering the ecosystem in the river. In summary, a heat exchanger measuring 1.64 m long, 0.48 m wide, and 2.1 m high was built with the 2.7 m total length and 13 mm diameter of the pipe on the heat exchanger, a diameter of 1.35 m and 70mm shell, and a 27 liter volume on the tank. In shell and tube heat exchanger, the material used was copper with a conductivity value of 385 W/mK; while in a centralized tube heat exchanger, the material used was aluminum with a conductivity value of 205 W/mK. The largest effectiveness post the experiment was 35.4040 %.

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Enke, Cristiano, Jorge Bertoldo Júnior, and Valeri Vlassov. "Transient response of an axially-grooved aluminum-ammonia heat pipe with the presence of non-condensable gas." Applied Thermal Engineering 183 (January 2021): 116135. http://dx.doi.org/10.1016/j.applthermaleng.2020.116135.

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Journal articles on the topic 'Aluminum heat pipe'

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