Готові списки джерел за темами / Thermal radiators

Добірка наукової літератури з теми "Thermal radiators"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Thermal radiators"

1

Mar’ina, Z. G., A. Y. Vereshchagin, A. V. Novozhilova, M. A. Komarevtsev, and K. O. Isaeva. "Study of the thermal characteristics of the aluminum radiator ROYAL Thermo Evolution." IOP Conference Series: Materials Science and Engineering 1211, no. 1 (January 1, 2022): 012005. http://dx.doi.org/10.1088/1757-899x/1211/1/012005.

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Анотація:
Abstract The use of aluminum radiators in heating systems began with the foreign companies products such as Fondital Group, Global Radiatori, Ferroli, etc. There are now Russian aluminum radiators companies that adhere to European standards, for example ROYAL Thermo, Rifar. The thermal characteristics of radiators are usually specified by the manufacturer. However, they are not always confirmed in practice. This is due to the fact that radiator connecting method is not taken into account. In some technical data sheets, the power reduction factors are given depending on the difference between the average coolant temperature and the air temperature in the room. Therefore, the study of the influence of aluminium heating appliances connecting on its thermal characteristics is an actual task. The article presents the results of research of radiator of the ROYAL Thermo Evolution type, it was made on request from company specialising in heating systems design. It was found that the actual thermal power of one section varies in the range of 135 … 225 W, depending on the connection method of the radiator, the thermal power of the section declared by the manufacturer corresponds only to the diagonal «top-bottom» connection, the thermal power of the eight-section radiator with one-sided «top-bottom» connection is 12% higher than with a diagonal one. Studies show, when designing heating systems, it is necessary to take into account the connection method and the number of device sections.
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2

Shui-Chang, Liu, Li Li-Fu, and Zhang Yong. "Vehicle Radiators’ Performance Calculation and Improvement Based on the Coupling of Multi-scale Models Simulations." Open Mechanical Engineering Journal 8, no. 1 (December 31, 2014): 636–42. http://dx.doi.org/10.2174/1874155x01408010636.

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Анотація:
In simulation of the heat transfer between radiator and air flow field, the adoption of the radiator full-size model containing its core body structure with small feature sizes would require huge storage space and not be economical. In view of this question, based on the coupling of multi-scale models simulations, a calculation method of radiator performance is proposed in this paper the reliability of which is verified by an experiment test. Subsequently, the influence on the radiators’ thermal performance of the layout of the parts in front of the radiators is analyzed. Lastly, the layout of the front parts is modified to enhance the radiators’ thermal performance. The investigation results indicate that: the radiators’ thermal performance calculation method based on simulations coupling of radiator multi-scale models considers the influences of air-side flow field distribution and the core body structure details; the error of the calculating values from the method is less than 5%, and the method is reliable; when the heat source parts in front of the radiators are situated right in front of the rear fan channel, the radiators thermal performance is better; the radiators cooling power increases 19.3kW after layout modification of the front heat resource parts.
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3

Sravan, Venapusa, Himani Srivastava, Pandey DHANRAJ Jitendra, and S. Senthur Prabu. "Investigation on Thermal Analysis of Spacecraft Radiators." ECS Transactions 107, no. 1 (April 24, 2022): 17073–83. http://dx.doi.org/10.1149/10701.17073ecst.

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Анотація:
In this research, the main objective is to compare the thermal properties of the rectangular and honeycomb structured space radiators used in spacecraft. The comparison of radiators was done by conducting steady state thermal analysis on these radiators by applying varying heat loads over it to analyse the thermal properties acting over them. The selection of appropriate material for the radiators was based on tensile strength, resistance to high temperature, and the type of working fluid considered. From the simulation results, the honeycomb structures of spacecraft radiator could withstand to a higher temperature gradient, and the rate of heat dissipation was much higher in comparison with rectangular fin type radiator, and hence it can be considered as a great replacement in near future.
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4

Chen, Liguo, and Bjørn Reidar Sørensen. "Modelling Multi-layer Hydronic Radiators." E3S Web of Conferences 172 (2020): 12007. http://dx.doi.org/10.1051/e3sconf/202017212007.

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Анотація:
This report simulates Purmo type C22 and C33 radiators with both standard calculation and heat transfer method with help of Matlab/Simulink. Simulation results are presented to describe the radiators’ thermal performances with different simulation strategies. The deviations between two different calculation methods are identified and the heat transfer radiator model can be improved with more investigations regarding thermal dynamics and controlling strategy. Under simulation scenarios of simple room model with a PID controller, type C33 has shorter response time and faster stabilization of room temperature; and it has lower outflow temperature, which implies higher energy efficiency.
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5

Šikula, Ondřej, Pavel Charvát, Lahouari Adjlout, and Omar Ladjedel. "Modeling of Radiators with Mass Flow Control." Applied Mechanics and Materials 887 (January 2019): 667–75. http://dx.doi.org/10.4028/www.scientific.net/amm.887.667.

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Анотація:
The topic of the contribution can be included in computer modeling of the thermal behavior of radiators for heating of buildings. Control of heaters leads to dynamic phenomena affecting the final thermal state of the heated room and heating energy consumption. The paper focuses on modeling of radiator quantitative control method using thermostatic valve. The objective of the paper is to show a quality of controlling and to compare an energy consumption when various thermostatic radiator valves time delay are set. The models of control, radiator, and a room are implemented in software TRNSYS. The results show significant differences in energy consumption.
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6

Hao, Gai Hong, and Ya Ping Zhang. "Thermal Performance Simulation of the Metal Foam Heat Sink." Solid State Phenomena 298 (October 2019): 208–13. http://dx.doi.org/10.4028/www.scientific.net/ssp.298.208.

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Анотація:
This study investigated the sintered metal among the regular finned heat sink. And a metal foam heat sink for power module cooling is designed. An improved computational model for effective thermal conductivity was obtained. Contrast to the two types of the heat sink, it is found that under the condition of the constant heat flow density, the heat accumulated is absent in metal foam heat sink. Meanwhile, the heat transfer coefficient of the metal foam heat sink is 3.6 times that of the finned heat sink of equivalent geometric parameter. At the same drop pressure, the air velocity of the metal foam heat sink is lower than that of the finned heat sink. The velocity of air in the foam radiator is lower than that in the finned radiator. Under the same fan power, the gain factor of the four finned metal foam radiators is about 20 times higher than that of the ribbed radiators of the same conditions.
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7

Kroulíková, Tereza, Tereza Kůdelová, Erik Bartuli, Jan Vančura, and Ilya Astrouski. "Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator." Polymers 13, no. 7 (April 6, 2021): 1175. http://dx.doi.org/10.3390/polym13071175.

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Анотація:
A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.
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8

Kushwah, Pavan. "Review on Thermal Analysis of Automobile Radiator." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (July 31, 2021): 3758–66. http://dx.doi.org/10.22214/ijraset.2021.37186.

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Анотація:
Radiators are used to transfer thermal energy from one medium to another for the purpose of cooling. Low efficiency heat exchangers used in automotive as radiator may cause to serious dangers for the engine. Hence, thermal scientists and engineers always pursuit modern methods to enhance the heat removal of the engine. It seems nanofluids implementation in automotive cooling system promises to achieve high efficiency radiators. This paper reviews almost all performed studies in this area that are available in the literature. Author collects details about nanoparticles materials and size, base fluid, volume, concentration, flow regime and Reynolds number used in studies. Usually, maximum heat transfer enhancement and maximum need of pumping power that occurs at the highest volumetric concentration of nanoparticles, simultaneously. On the other hand, using nanofluids, due to the enhanced heat carrying capacity of the nanofluids; the pumping power required will also be reduced.
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9

Huang, Haibo, Xiaohua Huang, Zaijun Cheng, and Yuanzhang Wang. "Simulation study of nanomaterials in heat pipe enhanced high power LED heat sink." Journal of Physics: Conference Series 2535, no. 1 (June 1, 2023): 012021. http://dx.doi.org/10.1088/1742-6596/2535/1/012021.

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Анотація:
Abstract To facilitate the simulation of heat dissipation of high-power LED lamps, a set of simplified models for tubular heat pipes and carbon nanotube arrays were first established to estimate their thermal conductivity. Then several kinds of radiators were designed. The application of nanomaterials and heat pipes in the heat dissipation of lamps was studied by the finite element method. It is found that the radiator with vertical suspended fins strengthened by a heat pipe and heat dissipation coating has a better heat dissipation effect than other radiators. Finally, the simulation study of thermal interface materials and heat dissipation coatings for lamps and lanterns heat dissipation is carried out. The results show that the thermal interface materials of carbon nanotubes and carbon nano coatings can enhance the heat dissipation performance of lamps.
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10

Võsa, Karl-Villem, Andrea Ferrantelli, and Jarek Kurnitski. "Assessment of downward draught in high-glazing facades in cold climates – experimental and CFD study into draught control with a 21-type radiator." E3S Web of Conferences 246 (2021): 02002. http://dx.doi.org/10.1051/e3sconf/202124602002.

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Анотація:
This paper investigates the interaction of a radiator’s thermal plume and downdraught of cold glazed surfaces. Draughts in working areas are one of the most common thermal comfort complaints in modern buildings. A typical solution for dealing with these draughts is positioning the heat emitters such as radiators or convectors under the windows. However, with thermally efficient envelopes, the internal loads compromise a relatively high fraction of the heating demand and the emitters are working under partial loads in modern buildings. This study comprises two parts: an experimental phase in the EN442 standardized test chamber with a 21-type radiator, and a CFD simulation phase, where the model is validated and applied under an expanded set of boundary conditions. The expanded simulation set results provide preliminary insight into sizing and design. More specifically, the thermal plume can be parametrised with a velocity and temperature value along with the room air and glazing temperatures for a broader analysis and assessment of the risk of draught.
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Більше джерел

Дисертації з теми "Thermal radiators"

1

Wu, Ziran. "Electromagnetic Crystal based Terahertz Thermal Radiators and Components." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195207.

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Анотація:
This dissertation presents the investigation of thermal radiation from three-dimensional electromagnetic crystals (EMXT), as well as the development of a THz rapid prototyping fabrication technique and its application in THz EMXT components and micro-system fabrication and integration. First, it is proposed that thermal radiation from a 3-D EMXT would be greatly enhanced at the band gap edge frequency due to the redistribution of photon density of states (DOS) within the crystal. A THz thermal radiator could thus be built upon a THz EMXT by utilizing the exceptional emission peak(s) around its band gap frequency. The thermal radiation enhancement effects of various THz EMXT including both silicon and tungsten woodpile structures (WPS) and cubic photonic cavity (CPC) array are explored. The DOS of all three structures are calculated, and their thermal radiation intensities are predicted using Planck's Equation. These calculations show that the DOS of the silicon and tungsten WPS can be enhanced by a factor of 11.8 around 364 GHz and 2.6 around 406 GHz respectively, in comparison to the normal blackbody radiation at same frequencies. An enhancement factor of more than 100 is obtained in calculation from the CPC array. A silicon WPS with a band gap around 200 GHz has been designed and fabricated. Thermal emissivity of the silicon WPS sample is measured with a control blackbody as reference. And enhancements of the emission from the WPS over the control blackbody are observed at several frequencies quite consistent with the theoretical predictions. Second, the practical challenge of THz EMXT component and system fabrication is met by a THz rapid prototyping technique developed by us. Using this technique, the fabrications of several EMXTs with 3D electromagnetic band gaps in the 100-400 GHz range are demonstrated. Characterization of the samples via THz Time-domain Spectroscopy (THz-TDS) shows very good agreement with simulation, confirming the build accuracy of this prototyping approach. Third, an all-dielectric THz waveguide is designed, fabricated and characterized. The design is based on hollow-core EMXT waveguide, and the fabrication is implemented with the THz prototyping method. Characterization results of the waveguide power loss factor show good consistency with the simulation, and waveguide propagation loss as low as 0.03 dB/mm at 105 GHz is demonstrated. Several design parameters are also varied and their impacts on the waveguide performance investigated theoretically. Finally, a THz EMXT antenna based on expanding the defect radius of the EMXT waveguide to a horn shape is proposed and studied. The boresight directivity and main beam angular width of the optimized EMXT horn antenna is comparable with a copper horn antenna of the same dimensions at low frequencies, and much better than the copper horn at high frequencies. The EMXT antenna has been successfully fabricated via the same THz prototyping, and we believe this is the first time an EMXT antenna of this architecture is fabricated. Far-field measurement of the EMXT antenna radiation pattern is undergoing. Also, in order to integrate planar THz solid-state devices (especially source and detector) and THz samples under test with the potential THz micro-system fabricate-able by the prototyping approach, an EMXT waveguide-to-microstrip line transition structure is designed. The structure uses tapered solid dielectric waveguides on both ends to transit THz energy from the EMXT waveguide defect onto the microstrip line. Simulation of the transition structure in a back-to-back configuration yields about -15 dB insertion loss mainly due to the dielectric material loss. The coupling and radiation loss of the transition structure is estimated to be -2.115 dB. The fabrication and characterization of the transition system is currently underway. With all the above THz components realized in the future, integrated THz micro-systems manufactured by the same prototyping technique will be achieved, with low cost, high quality, self-sufficiency, and great customizability.
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2

Mora, Akhil, and Raghavendra Machipeddi. "Development of Tool in MATLAB for the Durability Prediction of Radiators." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15653.

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Анотація:
Durability is the most important factor in the design of heat-exchangers to meet the specifications of the customers. To predict the durability, endurance tests are carried out. In this thesis, one of the endurance tests, thermal cycling is performed for three different internal coolant flows until failure which is known as Wöhler test. A tool is developed in MATLAB that could import data from all kinds of endurance tests and visualizes time histories of every channel of the test (test parameters such as temperature, pressure, flow). An algorithm is developed for Level Crossing counting method which works based on the Markov cycle counting method. This produces Level crossing curves (LCC) for all the channels of the test which says how well a test has been performed and the total number of cycles of the test. It was observed that the LCCs obtained from the tool gives accurate results when compared with those obtained from LMS software whose approach of producing LCCs is Rainflow cycle counting method. Strain measurements are performed for the same flowrates as that of the Wöhler tests. The results from strain measurements and Wöhler tests are used in the determination of Basquin’s coefficient of the Wöhler curve. It was observed that the optimal value of Basquin’s coefficient is 3.4.
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3

Myhren, Jonn Are. "Potential of Ventilation Radiators : Performance evaluation by numerical, analytical and experimental means." Doctoral thesis, KTH, Strömnings- och klimatteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31813.

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Анотація:
Energy consumption for heating and ventilation of buildings is still in 2011considered far too high, but there are many ways to save energy and construct lowenergy buildings that have not been fully utilised. This doctoral thesis has focused onone of these - low temperature heating systems. Particular attention has been given tothe ventilation radiator adapted for exhaust-ventilated buildings because of itspotential as a low energy consuming, easily-operated, environmentally-friendlysystem that might also ensure occupant health and well-being. Investigations were based on Computational Fluid Dynamics (CFD) simulations andanalytical calculations, with laboratory experiments used for validation. Main conclusions: Low and very low temperature heating systems, such as floor heating, in general createan indoor climate with low air speeds and low temperature differences in the room, whichis beneficial for thermal comfort. A typical disadvantage, however, was found to beweakness in counteracting cold down-flow from ventilation air supply units in exhaustventilatedbuildings. with ventilation radiators, unlike most other low temperature systems, it was found thatthe risk of cold draught could be reduced while still maintaining a high ventilation rateeven in cold northern European winters. ventilation radiators were found to be more thermally efficient than traditional radiators. design of ventilation radiators could be further modified for improved thermal efficiency. at an outdoor temperature of -15 °C the most efficient models were able to give doublethe heat output of traditional radiators. Also, by substituting the most efficient ventilationradiators for traditional radiators operating at 55 °C supply water temperature, it wasfound that supply water temperature could be reduced to 35 °C while heat outputremained the same and comfort criteria were met. lowering the supply water temperature by 20 °C (as described above) could givecombined energy savings for heating and ventilation of 14-30 % in a system utilising aheat pump. supply water temperatures as low as 35 °C could increase potential for utilising lowtemperature heat sources such as sun-, ground-, water- or waste-heat. This would beparticularly relevant to new-built “green” energy-efficient buildings, but severaladvantages may apply to retrofit applications as well. Successful application of ventilation radiators requires understanding of relevant buildingfactors, and the appropriate number, positioning and size of radiators for best effect.Evaluation studies must be made at the level of the building as a whole, not just for theheating-ventilation system. This work demonstrated that increased use of well-designed ventilation radiatorarrangements can help to meet regulations issued in 2008 by the Swedish Departmentof Housing (Boverket BBR 16) and goals set in the Energy Performance of BuildingsDirective (EPBD) in the same year.
QC 20110328
STEM Projektnummer:30326-1 Energieffektiva lågtemperatursystem i byggnader
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4

Gerova, Klementina. "Thermo-fluid effects associated with modelling subscale automotive heat exchangers." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9875.

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Анотація:
Automotive components are tested extensively in wind tunnels by automotive manufacturers and race teams. This is usually achieved using an accurate scale model representation of the component within the wind tunnel. Automotive heat exchangers, however, are comprised of numerous intricate geometries and are therefore impractical to produce at model scale. Instead they are simply modelled as pressure drops, achieved using a thin mesh or honeycomb of known porosity. Most commercial computational fluid dynamics solvers ignore the geometry of the heat exchanger and instead model it as a discontinuity with a known pressure drop and heat transfer. The pressure drop across an automotive heat exchanger, however, was found to vary with both the coolant temperature and the angle of inclination of the heat exchanger. This thesis initially presents a relationship between the pressure drop coefficient and the inclination angle for varying media porosities. Mathematical relationships for inclination angles of 0°, 15°, 30° and 45°. were derived relating this pressure drop coefficient to the porosity of the media. Weighted least squares is proposed over ordinary least squares when obtaining the Forchheimer equation coefficients from experimental measurements. Investigation extends into the thermo-fluid effects on a full scale automotive heat exchanger when inclined at 0 °, 15°, 30° and 45°. It was found, depending on the angle, that there was a difference in the pressure drop of up to 10% between the unheated and heated (100 C) heat exchanger. Based on the proposed mathematical relationship, this correlated to a 4% decrease in porosity in order to accurately model the automotive heat exchanger at subscale. The thesis concludes with experimental and numerical investigation into the heat transfer on a hydrodynamically and thermally developing ow within a radiator channel. Laser doppler anemometry measurements recorded a 1.5% increase in the centreline velocity compared to 0.8% obtained from numerical simulation.
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5

Pyszczyková, Anna. "Vytápění střední školy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240443.

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Анотація:
The introduction of theoretical part deals history of floor heating. Here is an overview of the technology, which was for centuries used for floor heating. Further included in the introductory part of the aggregate materials used, which are used for floor heating, and used. In the next part of the theoretical introduction we are given the best known ecological heat source. These are mainly heat pumps and solar collectors. The last part is made in the proposal which are important values calculated for the design and seamless use of central heating system.
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6

Dvořák, Václav. "Vytápění staveb. objektu zdroji na různé druhy paliv s vyhodnocením ekonomické výhodnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226821.

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Анотація:
This work deals with the topic „Heating buildings building resources on different types of fuel in assessing economic benefits“. On this theme is elaborated theoretical part, then the topic is applied to the specified building. The project is design central heating, water heating, water heater design power unit. The project is designed in two versions. In the first variant are the heat source gas boilers. In the second variant are the heat source heat pumps.
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7

Valášek, Martin. "Návrh otopné soustavy pro rekonstruovaný dům." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231107.

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Анотація:
The master’s thesis contains a complete design scheme of the heating system for a family house after additional thermal insulation of some structures. In the first part, we will learn about the house and the climatic conditions. In the next section there is the calculation of the overall heat transfer coefficients for building structures and also of the heat losses of the building before and after additional insulation. In the next section there is a selection of the temperature gradient, radiators, heat proposal for an option with a single source as well as for an option with two sources. The pressure losses through each element were calculated and hydraulic balancing using the thermo-regulation valves was performed. In the conclusion the safety components were checked and the total costs of both the implementation and the drawing documentation were assessed.
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8

Brembilla, Christian. "Modelling and simulation of building components : thermal interaction between multilayer wall and hydronic radiator." Licentiate thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121201.

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Анотація:
Background and Scope: The scope of this thesis is to investigate the thermal behaviour of building components as hydronic radiator and multilayer walls subjected to dynamic conditions. The modelling and simulation of these building components provide information on how these components thermally interact among each other. The thermal interaction is fundamental to know how the energy is used in buildings. In particular, the thermal energy used in rooms can be expressed as the efficiencies for emission in a space heating system. This thesis analyzes the efficiencies for emission of a space heating system equipped with hydronic radiator for Swedish buildings by providing a comprehensive and detailed approach on this topic. Methodology: The methods used in this thesis are: experiment, modelling of multilayer wall and hydronic radiator, the dynamic simulation of the building and the efficiencies for emission of a space heating system. Here, the experiment, known as step response test, shows the heating up process of a hydronic radiator. The observation of the qualitative measurements suggests the most suitable technique of modelling the radiator known as transient modelling with multiple storage elements. The multilayer wall has been discretized both in space and time variable with a Finite Difference Method. Dynamic simulation of the building provides the efficiencies for emission of a space heating system. Findings: The experimental results show how the radiator performs the charging phase. The performance of the transient model is compared with lumped steady state models in terms of temperature of exhaust flow and total heat emitted. Results of the dynamic simulation show how buildings located in a Northern climate use the energy in a better way than Southern climates in Sweden. Heavy active thermal mass provides higher efficiencies for emission than light thermal mass. Radiators with connection pipes located on the same side react faster at the thermodynamic changing of the mass flow rate by providing higher efficiencies for emission than radiators with connection pipes located on the opposite side. Conclusion and Outlook: This thesis increases the knowledge about the modelling and simulation of hydronic radiators and multilayer walls. More research is needed on this topic to encompass modelling details of building components often ignored. The modelling and simulation of building components are the key to understand how building components thermally interact with each other. The thermal interaction among building components is a fundamental parameter for the assessment of efficiencies of emission of the space heating system. In the near future, the concept of efficiencies of emission can be implemented in National Building Code, therefore, this study provides guidelines on how to assess these efficiencies.

Advisors: Ronny Östin and Mohsen Soleimanni Mohseni, Department of Applied Physics and Electronics, Umeå University

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9

Kabiri, Rahani Ehsan. "Modeling of Ultrasonic and Terahertz Radiations in Defective Tiles for Condition Monitoring of Thermal Protection Systems." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/203011.

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Анотація:
Condition based monitoring of Thermal Protection Systems (TPS) is necessary for safe operations of space shuttles. In the current research Terahertz radiation (T-ray) has been used to detect mechanical and heat induced damages in TPS tiles. Voids and cracks inside the foam tile are denoted as mechanical damage while property changes due to long and short term exposures of tiles to high heat are denoted as heat induced damage.Ultrasonic waves cannot detect cracks and voids inside the tile because the tile material (silica foam) has high attenuation for ultrasonic energy. Instead, electromagnetic terahertz radiation can easily penetrate into the foam material and detect the internal voids although this electromagnetic radiation finds it difficult to detect delaminations between the foam tile and the substrate plate. Thus these two technologies are complementary to each other for TPS inspection.Ultrasonic and T-ray field modeling in free and mounted tiles with different types of mechanical and thermal damages has been the focus of this research. Shortcomings and limitations of FEM method in modeling 3D problems especially at high-frequencies has been discussed and a newly developed semi-analytical technique called Distributed Point Source Method (DPSM) has been used for this purpose.A FORTRAN code called DPSM3D has been developed to model both ultrasonic and electromagnetic problems using the conventional DPSM method. DPSM has been extended from ultrasonic applications to electromagnetic to model THz Gaussian beams, multilayered dielectrics and Gaussian beam-scatterer interaction problems. Since the conventional DPSM has some drawbacks, to overcome it two modification methods called G-DPSM and ESM have been proposed.The conventional DPSM in the past was only capable of solving time harmonic (frequency domain) problems. In this research DPSM has been extended to model DPSM transient problems. This modified technique has been denoted as t-DPSM.Using DPSM, scattering of focused ultrasonic fields by single and multiple cavities in fluid&solid media is studied. A comparison between the radiation forces generated by the ultrasonic energies reflected from two small cavities versus a single big cavity is also carried out.
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Dalke, Phillip Allen. "Model-Based Design and Analysis of Thermal Systems for the Ohio State EcoCARMobility Challenge Vehicle." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu159545443238678.

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Книги з теми "Thermal radiators"

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A, Banks Bruce, and United States. National Aeronautics and Space Administration., eds. Arc-textured metal surfaces for high thermal emittance space radiators. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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2

A, Dever Joyce, and United States. National Aeronautics and Space Administration., eds. Evaluation of thermal control coatings for use on solar dynamic radiators in low earth orbit. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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3

Delil, A. A. M. Considerations concerning a thermal joint for a deployable or steerable battery radiator for the Columbus Polar Platform. Amsterdam: National Aerospace Laboratory, 1986.

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4

P, Peterson G., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Review of advanced radiator technologies for spacecraft power systems and space thermal control. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1994.

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5

L, Hotes Deborah, Paulsen Phillip E, and United States. National Aeronautics and Space Administration., eds. The effects of atomic oxygen on the thermal emittance of high temperature radiator surfaces. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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6

A, Orwoll Robert, and United States. National Aeronautics and Space Administration., eds. Shielding materials for highly penetrating space radiations: Final technical report, NASA cooperative agreement NCC-1-151. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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7

Arc-textured metal surfaces for high thermal emittance space radiators. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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8

Arc-textured metal surfaces for high thermal emittance space radiators. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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9

Muniak, Damian Piotr. Radiators in Hydronic Heating Installations: Structure, Selection and Thermal Characteristics. Springer, 2018.

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Muniak, Damian Piotr. Radiators in Hydronic Heating Installations: Structure, Selection and Thermal Characteristics. Springer, 2017.

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Частини книг з теми "Thermal radiators"

1

Muniak, Damian Piotr. "Radiator Thermal Characteristic." In Radiators in Hydronic Heating Installations, 49–107. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55242-2_3.

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2

Pukhkal, Viktor, and Suren Markaryan. "Influence of Connection Configuration on the Thermal Flow of Hot Water Heating Systems’ Sectional Radiators." In XV International Scientific Conference “INTERAGROMASH 2022”, 1109–15. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21432-5_118.

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3

Petrik, Máté, and Gábor L. Szepesi. "Investigation of the Effect of a Coolant Inlet Duct on the Thermal Performance of Car Radiators." In Vehicle and Automotive Engineering 4, 339–45. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15211-5_29.

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4

Singer, D. "Mode of Action, Efficacy, and Safety of Radiant Warmers in Neonatology." In Water-filtered Infrared A (wIRA) Irradiation, 167–77. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92880-3_13.

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AbstractGiven the serious adverse effects of hypothermia in term and preterm infants, thermal protection is of paramount importance in neonatal care. To compare potential benefits of wIRA radiators with conventional radiant warmers in neonatology, physical investigations (agar phantoms) and clinical observations (term and preterm neonates) were performed. Physical investigations revealed a fundamental difference in the mode of action between the two types of radiation: Whereas with conventional radiant warmers, the increase in core temperature (phantoms) is preceded by marked elevations in surface temperature, wIRA leads to more direct rises in core temperature and results in smaller amounts of evaporative water loss from the surface. Clinical observations reveal that wIRA causes less skin surface warming than conventional heat irradiation at equal power densities (irradiances). wIRA used as a supplementary source of heat during primary care in the delivery room was found to exert a preventive effect against unintentional heat loss during the subsequent incubator transport of preterm neonates to the intensive care unit. Overall, due to its specific physical properties (“enhanced depth effect with less surface overheating”), wIRA seems to be particularly suited to replace the extra heat losses occurring in preterm or otherwise compromised neonates without undue risk of superficial burns.
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Lee, L. C. "Theories of Non-Thermal Radiations from Planets." In Plasma Waves and Instabilities at Comets and in Magnetospheres, 239–49. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm053p0239.

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6

Seybold, Lothar, W. Filsinger, F. Gruber, B. Taxis, I. Lazaridis, and A. Seryi. "Optimization of an engine coolant radiator for vehicle thermal management." In Proceedings, 1465–82. Wiesbaden: Springer Fachmedien Wiesbaden, 2016. http://dx.doi.org/10.1007/978-3-658-13255-2_108.

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7

Kılıç, Muhsin, Gökhan Sevilgen, and Mustafa Mutlu. "Three-Dimensional Numerical Analysis of Thermal Output of a Steel Panel Radiator." In Progress in Exergy, Energy, and the Environment, 585–93. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04681-5_55.

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8

Lianfa, Yang, Wang Qin, and Zhang Zhen. "The Analysis of Thermal Field and Thermal Deformation of a Water-Cooling Radiator by Finite Element Simulation." In Advances in Intelligent Systems, 53–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27869-3_7.

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9

Li, Zengen, Haochun Zhang, Dong Zhang, Qi Wang, and Yan Xia. "Performance Analysis and Optimization of Heat Pipe-Based Radiator for Space Fission Power System Thermal Management." In Springer Proceedings in Physics, 1174–90. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8899-8_111.

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10

Figiel, E. "Low radiator design temperatures – analysis of the ability to utilise solar heat gains and create thermal comfort based on dynamic simulations." In Advances in Environmental Engineering Research in Poland, 279–90. London: Routledge, 2021. http://dx.doi.org/10.1201/9781003171669-27.

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Тези доповідей конференцій з теми "Thermal radiators"

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Garcia, Jose, and Randall Shearer. "Internal Corrosion Testing of Aluminum Radiators." In Vehicle Thermal Management Systems Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/931107.

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2

Walgren, Patrick, Othmane Benafan, Lisa Erickson, and Darren Hartl. "Towards High Turndown Ratio Shape Memory Alloy-Driven Morphing Radiators." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8091.

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Future manned space missions will require thermal control systems that can adapt to larger fluctuations in temperature and heat flux that exceed the capabilities of current state-of-the-art systems. These missions will demand novel space radiators that can vary the heat rejection rate of the system to maintain the crew cabin at habitable temperatures throughout the entire mission. Current systems can provide a turndown ratio (defined as the ratio of maximum to minimum heat rejection) of 3:1 under adverse conditions. However, future missions are projected to demand thermal control systems that can provide a turndown ratio of more than 6:1. A novel radiator concept, known as the morphing radiator, varies the system heat rejection rate by altering the shape of the radiator that is exposed to space. This shape change is accomplished through the use of shape memory alloys, a class of active materials that exhibit thermomechanically-driven phase transformations and can be used as both sensors and actuators in thermal control applications. In past efforts, prototype morphing radiators have been tested in a relevant thermal environment, demonstrating the feasibility and scalability of the concept. This work summarizes the progress towards testing a high-performance morphing radiator in a relevant thermal environment and details the development of an efficient numerical model that predicts the mechanical response of an arbitrary morphing radiator configuration due to changes in temperature. Model predictions are then validated against previous experimental results, demonstrating the usefulness of the model as a design tool for future morphing radiator prototypes.
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3

Wang, Yifeng, and Chitao Feng. "Spectral blue shift of thermal radiators." In Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, edited by Mingzhi Wei, Xinjian Yi, Jianzhong Han, and Fiodor F. Sizov. SPIE, 1998. http://dx.doi.org/10.1117/12.317814.

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4

Ott, R. D., A. Zaltash, and J. W. Klett. "Utilization of a Graphite Foam Radiator on a Natural Gas Engine-Driven Heat Pump." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33348.

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A natural gas engine-driven heat pump was outfitted with a graphite foam radiator to demonstrate its thermal efficiency and compare it with that of a conventional radiator. A sequence of tests was performed with the graphite foam radiator operating in series with the standard aluminum radiator. Most aluminum air-to-water radiators exhibit an overall heat transfer coefficient up to 100 W/(m2·K). Laboratory experiments have demonstrated that a graphite foam radiator can achieve an overall heat transfer coefficient up to an order of magnitude larger. The mesophase pitch derived graphite foam is a material that offers excellent thermal management capability. The foam has an accessible surface area of 4 m2/g and an open cell structure with graphitic ligaments aligned parallel to the cell walls, giving it an overall bulk thermal conductivity of up to 175 W/(m·K). The bulk thermal conductivity of aluminum is 180 W/(m·K). The density of the graphite foam is a fifth of that of aluminum and its thermal diffusivity is three times greater than aluminum. These properties allow the graphite foam to be utilized in radiator, or any other heat exchanger, designs that are more efficient than conventional radiators. A graphite foam radiator designed to reject a given amount of heat will be smaller in size, weigh less, require less cooling air, and be quicker at removing heat than a conventional aluminum radiator.
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5

Balen, Igor, and Vladimir Soldo. "Water-cooling system with flat-plate solar radiators." In Thermal Sciences 2004. Proceedings of the ASME - ZSIS International Thermal Science Seminar II. Connecticut: Begellhouse, 2004. http://dx.doi.org/10.1615/ichmt.2004.intthermscisemin.540.

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6

Wang, Y. X., and G. P. Peterson. "Experimental Investigation of Micro Heat Pipe Radiators in Radiation Environment." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24325.

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Abstract A flexible micro heat pipe radiator, fabricated by sintering an array of aluminum wires between two thin aluminum sheets, was developed as part of a program to conceptulize, develop, and test lightweight, flexible radiator fin structures for use on long-term spacecraft missions. A detailed experimental investigation was conducted to determine the temperature distribution, maximum heat transport capacity, and radiation efficiency of these micro heat pipe radiators in a radiation environment. Experimental results from three Aluminum-Acetone micro heat pipe radiators with wire diameters of 0.635 mm, 0.813 and 1.016 mm are presented, evaluated and discussed. The results of the experimental program indicted that the maximum heat transport capacity and radiation efficiency, both increased with increasing wire diameter. The maximum heat transport capacity of the micro heat pipe radiator utilizing a wire diameter of 0.635 mm was 15.2 W. The radiators utilizing wire diameters of 0.813 mm and 1.016 mm never reached the maximum heat transport capacities for the given test conditions. In the tests, temperature distributions were recorded for several sink temperatures and indicated that as the sink temperature decreased the radiation efficiency decreased for a given heat input. The maximum heat transport capacity increased with increasing evaporating temperature for the micro heat pipe radiator utilizing a wire diameter of 0.635 mm. Comparison of micro heat pipe radiators with and without working fluid, indicated that significant improvements in temperature uniformity and radiation efficiencies could be obtained, especially at high heat fluxes. A maximum radiation efficiency of 0.95 was observed. In general, while some variation in performance was observed, all three micro heat pipe radiators were found to be capable of meeting the thermal requirements of long-term missions.
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Lilly, Jared, Bethany Hansen, Ryan Lotz, Darren Hartl, Thomas Cognata, Priscilla Nizio, and Connor Joyce. "Development and Experimental Demonstration of a Shape Memory Alloy-Based Adaptive Two-Phase Radiator for Space Applications." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2361.

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Abstract Future space exploration, such as the Artemis program, journeys to Mars, and future lander missions will require thermal control systems (TCSs) with the ability to adapt to a wide range of thermal loads due to vastly fluctuating external temperatures. Current TCSs employ radiators that can achieve a turndown ratio (defined as the ratio of the maximum to minimum heat rejection rates) of 12:1 by utilizing regenerative heat exchangers and a two-fluid-loop system, both of which are heavy and complex. However, future missions will demand radiators that can provide turndown ratios of 12:1 while remaining light, functionally passive, and simply designed. Previous work has investigated using shape memory alloy (SMA) components in single phase radiator prototypes to achieve efficient heat rejection. Preliminary analysis shows that SMA-based radiators can enable turndown ratios as high as 37:1. In this paper, the design, fabrication, and testing of an SMA torque tube driven radiator prototype is discussed. The SMA torque tube is attached to a heat rejecting panel that resembles flat radiator panels currently installed on the International Space Station. As the temperature of the working fluid in the TCS increases, the SMA torque tube actuates and rotates the panel, allowing for more radiative heat rejection to occur. This new design matures the concept past a previous prototype that merely demonstrated actuation under single-phase (e.g., liquid water) flow. The current radiator prototype has been designed to function not only with closed-loop, single-phase fluid flow, but also in conjunction with a two-phase TCS and even as a heat pipe. Both approaches take advantage of phase transformation of the working fluid to improve overall TCS efficiency and decrease complexity. During testing, a heated two-phase working fluid was circulated through the system, resulting in a maximum angular actuation of 67 degrees, thus demonstrating two-phase operation for the first time. These results give confidence that an SMA torque tube-driven radiator can outperform current radiators as development continues.
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Scott, Arthur C. "Corrosion Performance of Long-Life Automobile Radiators." In 1995 Vehicle Thermal Management Systems Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/971857.

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9

Ainali, Markku S., Tapio Korpinen, and Olof Forsén. "External Corrosion Resistance of CuproBraze® Radiators." In 1995 Vehicle Thermal Management Systems Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-1718.

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10

Li Chen and Mehran Mehregany. "Exploring Silicon Carbide For Thermal Infrared Radiators." In 2007 IEEE Sensors. IEEE, 2007. http://dx.doi.org/10.1109/icsens.2007.4388475.

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Звіти організацій з теми "Thermal radiators"

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Keddy, M. D. Experimental and theoretical investigation of operational and survivability issues in thermal radiators for thermionic space nuclear power systems. Final report. Office of Scientific and Technical Information (OSTI), March 1994. http://dx.doi.org/10.2172/10150113.

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Wang, Weimin, Satoshi Sasaki, and Masaki Kakizawa. Thermal Analysis for a Radiator Using CFD. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0332.

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3

Kundu, Tribikram. Modeling of Ultrasonic and Terahertz Radiations in Defective Tiles for Condition Monitoring of Thermal Protection Systems. Fort Belvoir, VA: Defense Technical Information Center, April 2013. http://dx.doi.org/10.21236/ada582581.

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