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Journal articles on the topic 'Heat - Convention, Natural'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Liu, Yi. "Analysis of Influence Factors on the Internal-Melt Ice-on-Tube while Melting." Applied Mechanics and Materials 580-583 (July 2014): 2452–56. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2452.

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The numerical simulation is widely used in study of the ice storage system. The model about melting is established and solved by using enthalpy method. Natural convection of the melted water in the course of melting is studied. Effects on the performance of heat-exchange, caused by variation of velocity of the refrigerant, inner diameter of the tube, initial temperature of the external water and inlet temperature of the refrigerant, are simulated and analyzed. 1. As the increase of cryogen inlet temperature, the influence of natural convention is more and more in the process of melting heat tr

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2

Liu, Yi, and Xin Chen. "Thermodynamic Analysis of the Internal Melt-Ice-on-Tube during Melting under Natural Convection." Advanced Materials Research 937 (May 2014): 375–80. http://dx.doi.org/10.4028/www.scientific.net/amr.937.375.

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The numerical simulation of the ice melting processes in internal melt-ice-on-tube which is applied widely in the ice storage system is carried out. The dynamic mathematical models about melting are established and solved by using enthalpy method. Natural convection of the melted water in the course of melting is studied, and natural convection influences on single tube in melting heat transfer process is analyzed under the related parameters. Several conclusions are obtained:1. Because of natural convection of the melted water, the curve of melting interface is no longer a circle, but a curve

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3

Zhou, Shiyu, Xiaoping Liu, Guangyue Du, Chuanze Liu, and Yucheng Zhou. "Comparison study of CFD and artificial neural networks in predicting temperature fields induced by natural convention in a square enclosure." Thermal Science 23, no. 6 Part A (2019): 3481–92. http://dx.doi.org/10.2298/tsci171113084z.

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Natural convection in an enclosure is a classical problem in heat transfer field. In this study, natural convection induced by the heat source in the enclosure is studied with two analysis methods, i. e. CFD and artificial neural networks (ANN). The heat transfer in the enclosure is an unsteady process. During this process, the temperature fields in the enclosure are changing with time. The vertical temperature field of y = 0 at one moment is picked up for investigation. Firstly, FLUENT software which is a simulation program of CFD is adopted to simulate the temperature fields under different

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Ashjaee, Mehdi, Sajjad Bigham, and Sajad Yazdani. "A Numerical Study on Natural Convention Heat Transfer From a Horizontal Isothermal Cylinder Located Underneath an Adiabatic Ceiling." Heat Transfer Engineering 35, no. 10 (2013): 953–62. http://dx.doi.org/10.1080/01457632.2014.859878.

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Langford, Malcolm, and Peris Jones. "Between Demos and Ethnos: The Nepal Constitution and Indigenous Rights." International Journal on Minority and Group Rights 18, no. 3 (2011): 369–86. http://dx.doi.org/10.1163/157181111x583332.

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AbstractThis article examines the contested reception of the Convention concerning Indigenous and Tribal Peoples in Independent Countries (“ILO Convention 169”) in Nepal, particularly in the context of current constitutional reform and post-conflict economic development. Compelling evidence suggests that exclusionary political institutions, laws and structures have been the major cause of exclusion in contemporary Nepal. While Nepal is home to a range of different ethnic, language, religious and caste-based groups, the Adivasi Janajati (around 37 per cent of the population) consider themselves

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Jha, Basant K., and Yusuf Y. Gambo. "Transient natural convention heat and mass transfer flow in a vertical channel in the presence of Soret and Dufour effects: An analytical approach." International Journal of Modern Physics C 31, no. 02 (2020): 2050032. http://dx.doi.org/10.1142/s0129183120500321.

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This paper presents an analytical solution for transient natural convection heat and mass transfer flow in a vertical channel with Soret and Dufour effects. Due to the presence of these two effects, energy and concentration equations are coupled. The dimensionless governing equations for momentum, energy and concentration are first decoupled using perturbation method and then solved using Laplace Transform Technique (LTT) under relevant initial and boundary conditions. The expressions for temperature, concentration, velocity, rate of heat transfer, rate of mass transfer and skin-friction are o

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Kairakbaev, A. K., Ye S. Abdrakhimova, and V. Z. Abdrakhimov. "Innovative Approaches to Using Kazakhstan’s Industrial Ferrous and Nonferrous Tailings in the Production of Ceramic Materials." Materials Science Forum 989 (May 2020): 54–61. http://dx.doi.org/10.4028/www.scientific.net/msf.989.54.

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This paper covers the production of ceramic materials from the tailings of ferrous and nonferrous metallurgy without using convention natural materials. The research addresses the dependency of the polymetallic ore tailings, chromite ore tailings, and physico-mechanical properties of ceramic materials based on the clayey portion of zircon-ilmenite ore gravity tailings. The dependency model is based on the actual experimental data and provides an analytical description of the test results as a function. Regression analysis has produced mathematical models for predicting the properties of cerami

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8

Respondek, Zbigniew. "Heat Transfer Through Insulating Glass Units Subjected to Climatic Loads." Materials 13, no. 2 (2020): 286. http://dx.doi.org/10.3390/ma13020286.

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One of the structural elements used in the construction of insulating glass units (IGUs) are tight gaps filled with gas, the purpose of which is to improve the thermal properties of glazing in buildings. Natural changes in weather parameters: atmospheric pressure, temperature, and wind influence the gas pressure changes in the gaps and, consequently, the resultant loads and deflections of the component glass panes of a unit. In low temperature conditions and when the atmospheric pressure increases, the component glass panes may have a concave form of deflection, so that the thickness of the ga

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9

Quadros, Rodolfo, João Luiz Jucá, João Guilherme Ito Cypriano, Roberto Perillo Barbosa da Silva, Luiz Carlos Pereira da Silva, and Rafael Gomes Bento. "Implementation of Microgrid on the University Campus of UNICAMP- Brazil: Case Study." Journal of Electronics and Advanced Electrical Engineering 1, no. 2 (2021): 21–25. http://dx.doi.org/10.47890/jeaee/2020/rodolfoquadros/11120009.

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Based on the development of new technologies in the electrical engineering field, microgrids can be understood as the effective implantation of smart grids. These, in turn, have functionalities for energy management, such as voltage control, frequency, and demand management, and can also operate in a connected or island mode concerning the utilities resources. In the face of such technological advances and energy management, this paper presents a proposal for the implementation of a microgrid, called CampusGRID. This microgrid will be installed on the University Campus of UNICAMP - Brazil, bei

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Pacyna, Jozef M., Oleg Travnikov, Francesco De Simone, et al. "Current and future levels of mercury atmospheric pollution on a global scale." Atmospheric Chemistry and Physics 16, no. 19 (2016): 12495–511. http://dx.doi.org/10.5194/acp-16-12495-2016.

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Abstract. An assessment of current and future emissions, air concentrations, and atmospheric deposition of mercury worldwide is presented on the basis of results obtained during the performance of the EU GMOS (Global Mercury Observation System) project. Emission estimates for mercury were prepared with the main goal of applying them in models to assess current (2013) and future (2035) air concentrations and atmospheric deposition of this contaminant. The combustion of fossil fuels (mainly coal) for energy and heat production in power plants and in industrial and residential boilers, as well as

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Rufino, João Paulo Ferreira, and Lucieta Guerrero Martorano. "Thermal response of broilers in different poultry house models at the Amazon environmental conditions." Revista Acadêmica Ciência Animal 18 (October 23, 2020): 1. http://dx.doi.org/10.7213/2596-2868.2020.18016.

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The present study aimed to evaluate the thermal response of two models of aviary installed in different conditions of the Amazon rainforest and its effects on the poultry welfare. Two models of aviary were evaluated: conventional model, used in the Eastern Amazon (forced ventilation, low ceiling height, little vegetation around the aviary, and high density of birds per m2), and alternative model, used in the Western Amazon (natural ventilation, high ceiling height, a lot of vegetation around the aviary, and average density of birds per m2). Data collected were subjected to a Tukey test (p ≤ 0.

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Sheikhi, Nasrin, Mohammad Najafi та Vali Enjilela. "Modifying a meshless method to solving κ−ε turbulent natural convection heat transfer". International Journal of Modern Physics C 31, № 01 (2019): 2050014. http://dx.doi.org/10.1142/s012918312050014x.

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The conventional meshless local Petrov–Galerkin method is modified to enable the method to solve turbulent convection heat transfer problems. The modifications include developing a new computer code which empowers the method to adopt nonlinear equations. A source term expressed in terms of turbulent viscosity gradients is appended to the code to optimize the accuracy for turbulent flow domains. The standard [Formula: see text] transport equations, one of the most applicable two equation turbulent viscosity models, is incorporated, appropriately, into the developed code to bring about both vers

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Pua, SW, KS Ong, KC Lai, and MS Naghavi. "Natural and forced convection heat transfer coefficients of various finned heat sinks for miniature electronic systems." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 2 (2018): 249–61. http://dx.doi.org/10.1177/0957650918784420.

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Downward lighting light-emitting diodes require cooling with cylindrical fin heat sinks to be mounted on top and cooled under natural convection air cooling mode. Performance simulation would involve specification of the heat transfer coefficient. Numerous methods are available to simulate the performance of conventional plate fin heat sinks including computational fluid dynamics packages. It would be feasible to perform simulation based on conventional flat plate fin heat sinks. A cylindrical fin heat sinks could be simply treated as a plate fin heat sink, if we imagine it cut open and laid o

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14

Ariel, Mira. "Cognitive Universals and Linguistic Conventions." Studies in Language 23, no. 2 (1999): 217–69. http://dx.doi.org/10.1075/sl.23.2.02ari.

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Generativist pragmatists and discourse grammarians both subscribe to a functional view of language, but they do not agree on the nature of pragmatic principles. Prince (1988a,b) has argued that form-function correlations are arbitrary and language specific. Discourse grammarians have argued that pragmatic, and even grammatical rules, emerge out of universal, natural and predictable extralinguistic pressures. I will argue that although the distribution of gaps and resumptive pronouns in relative clauses seems arbitrary and language specific, one cognitively-based form-function principle governs

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15

Kumar, K. Kiran, and M. Ram Gopal. "Carbon dioxide as a secondary fluid in natural circulation loops." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 223, no. 3 (2009): 189–94. http://dx.doi.org/10.1243/09544089jpme242.

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In recent years there is growing interest in the use of carbon dioxide as a secondary fluid in various cooling and heating applications. In the present work a comparative study is made between carbon dioxide and conventional secondary fluids that can be used in natural circulation loops for various refrigeration and air conditioning applications. For the same heat input and total loop length, the results are presented in terms of the ratios of pipe diameter required when a conventional fluid is used to the required pipe diameter with carbon dioxide as the secondary fluid. Results are presented

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SARKAR, JAHAR. "TRANSCRITICAL CO2 REFRIGERATION SYSTEMS: COMPARISON WITH CONVENTIONAL SOLUTIONS AND APPLICATIONS." International Journal of Air-Conditioning and Refrigeration 20, no. 04 (2012): 1250017. http://dx.doi.org/10.1142/s2010132512500174.

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Carbon dioxide (CO2) is one of the natural refrigerants which can be used as working fluid in various refrigeration applications along with the ammonia and hydrocarbons due to its eco-friendliness, higher volumetric capacity, good heat transfer properties, etc. The present article consists of two parts: A detailed comparative study of CO2 -based transcritical refrigeration systems with conventional refrigerants-based systems in terms of both thermodynamic and heat transfer performances, and review of both theoretical and experimental researches on transcritical CO2 vapor compression cycle for

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17

Balachandar, C., S. Arunkumar, and M. Venkatesan. "Numerical Studies on Natural Convection Heat Transfer – Fins with Closed Top." Applied Mechanics and Materials 592-594 (July 2014): 1682–86. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1682.

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Fins are extended surfaces provided to enhance the heat transfer rate of a system. Several attempts have been made in the past to augment the heat transfer rate by using fins of various geometries. In the present study an array of rectangular fins with closed top, standing on a vertical base is analysed under natural convection conditions using commercial CFD code ANSYS FLUENT©. The numerical model is validated with the available experimental results for fins with open top under natural convection conditions. The plate fin heat sink is analysed for a constant heat duty of 60 W. The height, thi

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18

Kamal, Mazlina Mustafa. "Enhancement of Heat Ageing Properties of Epoxidised Natural Rubber Blend." Solid State Phenomena 317 (May 2021): 300–304. http://dx.doi.org/10.4028/www.scientific.net/ssp.317.300.

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In recent years, automotive hose and belt specifications have changed, requiring longer product life in terms of swelling, wear and heat ageing. Diene-based rubbers, such as natural rubber (NR) and styrene-butadiene rubber (SBR), have been widely used in diverse industries. However, some apparent defects such as limited ageing resistance and large compression set, have been demonstrated in some rubbers cured by sulfur or peroxides. In the making of general and industrial rubber goods, short production and sufficient scorch time is crucial especially by using an injection moulding. In this work

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19

HEO, JAEHYEOK, HOSEONG LEE, and RIN YUN. "TWO-PHASE FLOW BOILING AND CONDENSATION HEAT TRANSFER CHARACTERISTICS OF NATURAL REFRIGERANTS: REVIEW." International Journal of Air-Conditioning and Refrigeration 21, no. 04 (2013): 1330003. http://dx.doi.org/10.1142/s2010132513300036.

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The existing artificial and chemical refrigerants have been phased out due to environmental concerns, and they have been replaced with environmentally friendly refrigerants. Among them, carbon dioxide, ammonia, and hydrocarbons are paid attention as next generation refrigerants, and their application has been widely expanded. Therefore, in this paper, the latest studies of flow boiling and condensation heat transfer characteristics of carbon dioxide, ammonia, and hydrocarbon are reviewed. The heat transfer characteristics of ammonia and hydrocarbon show the relatively similar trends with the c

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20

ZECHMAN, L. G., and I. J. PFLUG. "Heat Penetration Rates of Natural Convection Heating Liquids in Metal Containers." Journal of Food Protection 57, no. 9 (1994): 802–7. http://dx.doi.org/10.4315/0362-028x-57.9.802.

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Heat penetration (HP) test data have been obtained for water in 13 sizes of metal cans and for 16 fluids with different physical properties in 211 × 400 metal cans. Data were collected until the slowest heating zone was less than 0.1 C° below the heating medium temperature. When conventional HP graphs were plotted, these natural convection heating liquids formed curves instead of straight lines. A straight line was fitted by least squares regression to the data between (T1 - T) values from 40.0 to 4.0, 10.0 to 1.0, 4.0 to 0.4, and 1.0 to 0.2 C° and the f-values determined. The results show tha

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ZECHMAN, L. G., and I. J. PFLUG. "Heat Penetration Rates of Natural Convection Heating Liquids in Metal Containers." Journal of Food Protection 58, no. 1 (1995): 108–14. http://dx.doi.org/10.4315/0362-028x-58.1.108.

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Heat penetration (HP) test data have been obtained for water in 13 sizes of metal cans and for 16 fluids with different physical properties in 211 × 400 metal cans. Data were collected until the slowest heating zone was less than 0.1 C° below the heating medium temperature. When conventional HP graphs were plotted, these natural convection heating liquids formed curves instead of straight lines. A straight line was fitted by least squares regression to the data between (T1 - T) values from 40.0 to 4.0, 10.0 to 1.0, 4.0 to 0.4, and 1.0 to 0.2 C° and the f-values determined. The results show tha

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Li, Yan Rong, Terumi Inagaki, Hikaru Saito, and Masashi Abe. "Thermo-Physical Properties of Magnetic Fluid and its Natural Convection Heat Transfer in a Horizontal Enclosed Rectangular Container." Applied Mechanics and Materials 620 (August 2014): 461–67. http://dx.doi.org/10.4028/www.scientific.net/amm.620.461.

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Thermo-physical properties of magnetic fluid were measured experimentally at various temperatures, in order to evaluate their temperature dependencies. Heat transfer by natural convection was also investigated in a horizontal enclosed rectangular container filled with the tested magnetic fluid. It was found that the heat transfer coefficient of the magnetic fluid keeps good agreement with the conventional heat-transfer correlation of natural convection heat transfer in a horizontal enclosed rectangular container by applying the values of thermo-physical properties obtained in the present work.

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Li, Yan Rong, Terumi Inagaki, and Hiroki Kashiwa. "Thermo-Physical Properties of Phase Change Materials and those Natural Convection Heat Transfer in a Horizontal Enclosed Rectangular Container." Applied Mechanics and Materials 620 (August 2014): 468–71. http://dx.doi.org/10.4028/www.scientific.net/amm.620.468.

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Thermo-physical properties of three kinds of phase change materials (sodium acetate trihydrate, erythritol and sodium sulfate decahydrate) were measured experimentally at various temperatures, in order to evaluate those temperature dependencies. Heat transfer by natural convection was also investigated in a horizontal enclosed rectangular container filled with the tested phase change materials, which was heated at the lower surface and cooled at the upper surface. It was found that the heat transfer coefficient of the liquid phase keeps good agreement with the conventional heat-transfer correl

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Brenn, J., P. Soltic, and Ch Bach. "Comparison of natural gas driven heat pumps and electrically driven heat pumps with conventional systems for building heating purposes." Energy and Buildings 42, no. 6 (2010): 904–8. http://dx.doi.org/10.1016/j.enbuild.2009.12.012.

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Guo, Zeng-Yuan, and Xiao-Bo Wu. "Thermal Drag and Critical Heat Flux for Natural Convection of Air in Vertical Parallel Plates." Journal of Heat Transfer 115, no. 1 (1993): 124–29. http://dx.doi.org/10.1115/1.2910637.

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Variable property effects on vertical channel natural convection in air are studied systematically. Numerical solutions of the governing equations show that both the mass flow rate and heat transfer in the channel are not only lower than the constant property results, but also show a nonmonotonic variation with increasing wall temperature or wall heat flux. This phenomenon, which seemingly conflicts with the conventional knowledge, has also been identified by experiments. For a vertical channel with a uniform heat flux boundary condition, the wall may experience a sharp rise in temperature up

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Park, K. A., and A. E. Bergles. "Natural Convection Heat Transfer Characteristics of Simulated Microelectronic Chips." Journal of Heat Transfer 109, no. 1 (1987): 90–96. http://dx.doi.org/10.1115/1.3248074.

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Microelectronic circuits were simulated with thin foil heaters supplied with d-c power. The heaters were arranged in two configurations: flush mounted on a circuit board substrate or protruding from the substrate about 1 mm. Heat transfer coefficients (midpoint) were obtained with two heater heights (5 mm, 10 mm) and varying width (2 mm ∼ 70 mm), in water and R-113. The height effect for single flush heaters agrees qualitatively with conventional theory; however, even the widest heaters have coefficients higher than predicted due to leading edge effects. The heat transfer coefficient increases

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Sztekler, Karol, Wojciech Kalawa, Sebastian Stefański, et al. "Integration adsorption chillers with conventional power plant." E3S Web of Conferences 108 (2019): 01011. http://dx.doi.org/10.1051/e3sconf/201910801011.

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According to predictions, electricity consumption in developed countries will increase three times by 2020 compared with 1970. In contrast, in developing countries, where the population may double by 2020 relative to 1970, there may even be a twentyfold increase in electricity consumption [1]. Other sources predict that increases in electricity demand by 2030 will be approx. 2 ÷ 3% a year. With such a high rate of development of the world economy, the electricity demand will be increasing. Thus, using only renewable sources to satisfy the demand for energy is insufficient and will remain so in

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Mary, S. Jasmine, B. Chithra, and S. Sivajiganesan. "IN VITRO ANTI – INFLAMMATORY ACTIVITY OF THE FLOWERS OF NERIUM OLEANDER (WHITE)." International Journal of Research -GRANTHAALAYAH 5, no. 6 (2017): 123–28. http://dx.doi.org/10.29121/granthaalayah.v5.i6.2017.2005.

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Inflammation is a part of the complex biological response of vascular tissues to harmful stimuli, such as pathogens, damaged cells or irritants. It is characterized by redness, swollen joints, joint pain, its stiffness and loss of joint function. Inflammation is currently treated by NSAIDs. Unfortunately these drugs cause increased risk of blood clot resulting in heart attacks and strokes. Therefore, the developments of potent anti-inflammatory drugs from the natural products are now under considerations. Natural products are rich source for discovery of new drugs because of their chemical div

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Bosiy, Mykola, and Olexandr Kuzyk. "Heat Pump Cycle Efficiency for Heat Supply." Central Ukrainian Scientific Bulletin. Technical Sciences, no. 3(34) (October 2020): 136–42. http://dx.doi.org/10.32515/2664-262x.2020.3(34).136-142.

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The aim of the article is to analyze the literature and scientific publications on the effectiveness of the heat pump in heat supply systems and to study the efficiency of using the steam compression cycle of a heat pump in a heat supply system. Тo conduct energy and exergy analysis of heat pump efficiency indicators, the working fluid of which is freon R134a, when using natural waters as a source of low-potential thermal energy. The article analyzes the literature sources and scientific publications on the effectiveness of the heat pump in heat supply systems. The results of research of effic

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Badache, Messaoud, Zine Aidoun, Parham Eslami-Nejad, and Daniela Blessent. "Ground-Coupled Natural Circulating Devices (Thermosiphons): A Review of Modeling, Experimental and Development Studies." Inventions 4, no. 1 (2019): 14. http://dx.doi.org/10.3390/inventions4010014.

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Compared to conventional ground heat exchangers that require a separate pump or othermechanical devices to circulate the heat transfer fluid, ground coupled thermosiphons or naturallycirculating ground heat exchangers do not require additional equipment for fluid circulation in theloop. This might lead to a better overall efficiency and much simpler operation. This paper providesa review of the current published literature on the different types of existing ground coupledthermosiphons for use in applications requiring moderate and low temperatures. Effort has beenfocused on their classificatio

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Amez, Isabel, Blanca Castells, Bernardo Llamas, et al. "Experimental Study of Biogas–Hydrogen Mixtures Combustion in Conventional Natural Gas Systems." Applied Sciences 11, no. 14 (2021): 6513. http://dx.doi.org/10.3390/app11146513.

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Biogas is a renewable gas with low heat energy, which makes it extremely difficult to use as fuel in conventional natural gas equipment. Nonetheless, the use of hydrogen as a biogas additive has proven to have a beneficial effect on flame stability and combustion behavior. This study evaluates the biogas–hydrogen combustion in a conventional natural gas burner able to work up to 100 kW. Tests were performed for three different compositions of biogas: BG70 (30% CO2), BG60 (40% CO2), and BG50 (50% CO2). To achieve better flame stability, each biogas was enriched with hydrogen from 5% to 25%. The

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Klein, Samuel, Henrique Fernandes, and Hans-Georg Herrmann. "Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography." Applied Sciences 11, no. 7 (2021): 3097. http://dx.doi.org/10.3390/app11073097.

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This work investigates the application of lock-in thermography approach for solar loading thermography applications. In conventional lock-in thermography, a specimen is subjected to a periodically changing heat flux. This heat flux usually enters the specimen in one of three ways: by a point source, a line source or an extended source (area source). Calculations based on area sources are particularly well suited to adapt to solar loading thermography, because most natural heat sources and heat sinks can be approximated to be homogenously extended over a certain region of interest. This is of p

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Baig, Altamash Ahmad, and Alan S. Fung. "Impact of Carbon Pricing on Energy Cost Savings Resulting from Installation of Gas-Fired Absorption Heat Pump at A Library Building in Ontario." Proceedings 23, no. 1 (2019): 2. http://dx.doi.org/10.3390/proceedings2019023002.

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This paper presents the results of analyzing the potential benefits of a natural gas-fired absorption heat pump (GAHP) for a library building in Ontario in terms of energy savings, fuel cost savings, and reduction in greenhouse gas emissions. Simulation model for the library building was created in eQUEST and calibrated using the energy consumption data from the 2012–2014. The results for energy savings were analyzed to include the effect of implementation of carbon pricing. It was concluded that because of implementation of carbon pricing, the replacement of conventional heating equipment wit

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Gortner, Florian, Peter Mitschang, Wiebke Neu, et al. "Efficient Process Chain for Processing Natural Fiber Reinforced Thermoplastics." Key Engineering Materials 809 (June 2019): 658–63. http://dx.doi.org/10.4028/www.scientific.net/kem.809.658.

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Natural fiber reinforced polymer composites (NFRPC) are conventionally processed in compression molding process to shell-shaped components, which are mostly used in automotive industry. Therefore, natural fibers (NF) and polypropylene (PP) as matrix system are processed to a thermoplastic organic sheet. Organic sheets are heated in a contact heating press to temperatures above melting temperature of the matrix and then transferred to a forming press. In this paper, Acrodur®Power 2750 X (AP) is used as an alternative to PP. This thermoplastic matrix system enables an increase of fiber content t

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Rahmati, Ahmad Reza, Sina Niazi, and Mehrdad Naderi Beni. "Natural Convection Flow Simulation of Nanofluid in a Square Cavity Using an Incompressible Generalized Lattice Boltzmann Method." Defect and Diffusion Forum 329 (July 2012): 69–79. http://dx.doi.org/10.4028/www.scientific.net/ddf.329.69.

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In this Paper, the Heat Transfer Performance in an Enclosure Including Nanofluids Is Studied. the Velocity Field Is Solved by an Incompressible Generalized Lattice Boltzmann Method and Heat Transfer Is Simulated Using Single-Relaxation-Time Lattice Boltzmann Method. the Hydrodynamics and Thermal Fields Are then Coupled Together Using the Boussinesq Approximation. the Fluid in the Square Cavity Is a Cu-Water Nanofluid. the Effects of Grashof Number and Solid Volume Fraction on Thermal and Hydrodynamic Characteristics Are Investigated. the Results Obtained Clearly Show that Heat Transfer Enhance

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Vikse, Matias, Harry Watson, Truls Gundersen, and Paul Barton. "Simulation of Dual Mixed Refrigerant Natural Gas Liquefaction Processes Using a Nonsmooth Framework." Processes 6, no. 10 (2018): 193. http://dx.doi.org/10.3390/pr6100193.

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Natural gas liquefaction is an energy intensive process where the feed is cooled from ambient temperature down to cryogenic temperatures. Different liquefaction cycles exist depending on the application, with dual mixed refrigerant processes normally considered for the large-scale production of Liquefied Natural Gas (LNG). Large temperature spans and small temperature differences in the heat exchangers make the liquefaction processes difficult to analyze. Exergetic losses from irreversible heat transfer increase exponentially with a decreasing temperature at subambient conditions. Consequently

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O’Reilly, J. M., and P. F. Monaghan. "Wind Evaporator Heat Pumps—Part II: Thermal Performance Results." Journal of Energy Resources Technology 114, no. 4 (1992): 286–90. http://dx.doi.org/10.1115/1.2905955.

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Wind evaporators are alternative evaporators for air source heat pumps which rely on wind-driven or natural convection to move air across the heat transfer surfaces. A fully automatic, computer-controlled test facility which allows side-by-side testing of wind evaporator and conventional heat pumps and monitoring of weather conditions has been designed and built at University College Galway. The aim of this paper is to quantify the advantages of wind evaporators by comparing the performance of a wind evaporator heat pump with that of a conventional heat pump over an extended testing period and

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Gala, Selfina, Mahfud Mahfud, Sumarno Sumarno, and Lailatul Qadariyah. "THE EXTRACTION OF NATURAL DYES FROM JACKFRUIT WOOD WASTE (Artocarpus Heterophyllus Lamk) WITH WATER SOLVENT BY USING THE MICROWAVE METHOD." Jurnal Bahan Alam Terbarukan 7, no. 2 (2018): 128–35. http://dx.doi.org/10.15294/jbat.v7i2.13254.

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Currently, exploration of natural dyes is increasingly being activated and developed, especially to find natural sources of dyes from different plant species and also to develop natural dyestuff extraction process technology for textile applications. During this natural dye extraction process is done by conventional methods that require a long time and a large amount of solvent. Therefore, it is a necessary alternative to the use of "green techniques" are economical in its use. In this research, extraction of Jackfruit wood waste with the microwave by studying the extraction time required to p

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Winter, Lisa, Kristin Hockauf, Mario Scholze, Ralph Jörg Hellmig, and Thomas Lampke. "Influence of Pre-Aging on the Artificial Aging Behavior of a 6056 Aluminum Alloy after Conventional Extrusion." Metals 11, no. 3 (2021): 385. http://dx.doi.org/10.3390/met11030385.

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In the present study, the influence of the initial heat-treatment conditions on the artificial aging behavior after conventional linear extrusion at room temperature was investigated for the precipitation hardening of a 6056 aluminum alloy. A solution-annealed condition was systematically compared to naturally-aged and pre-aged conditions. Differential scanning calorimetry was used for analyzing the precipitation sequence and its dependence on the initial heat treatment. The natural aging behavior prior to extrusion and the artificial aging behavior after extrusion were determined by microhard

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Kaunde, O. K. "Modeling of a Spray Assisted Natural Draft Cooling Tower." Tanzania Journal of Engineering and Technology 31, no. 1 (2008): 118–26. http://dx.doi.org/10.52339/tjet.v31i1.423.

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Cooling towers are one of the largest heat and mass transfer devices that are in common use. A novel type of cooling tower has been proposed in which air flow rate into the tower is drawn by ejector action of sprays instead of fans as is done in conventional mechanical forced or induced draft cooling towers. This novel design offers the potential of savingthe energy cost for driving the fan. The paper presents mathematical models for momentum transfer which is the driving force causing the entrainment of air. Also the heat transfer model for co-current flow of liquid and gas in the tower has b

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Elghool, Ali, Firdaus Basrawi, Hassan Ibrahim, Thamir K. Ibrahim, Shaharin A. Sulaiman, and M. Ishak. "Study on the Performance of a Thermo-Electric Generation Model with Two Different Materials of Heat Pipe-Heat Sink." MATEC Web of Conferences 225 (2018): 04009. http://dx.doi.org/10.1051/matecconf/201822504009.

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Heat sink lack of design is one reason that negatively affects the performance of thermoelectric modules. As compared to conventional cooling systems equipped with thermoelectric generators (TEG), heat pipe heat sink has various points of interest. Heat pipe heat sink is the most appropriate heat exchanger for medium temperature range under 300 °C. This paper demonstrates the effect of different materials of heat pipe-heat sink on the TEG performance. Two types of heat sinks were tested with TEG, one made from copper while the other from aluminium. The aim is to improve power output of TEG by

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Hudec, Matej. "Impact of Human Activity on Local Climate Change in Veľké Turovce by Heating and Possibilities for Carbon Dioxide Decrease." Acta Regionalia et Environmentalica 11, no. 2 (2014): 59–63. http://dx.doi.org/10.1515/aree-2014-0010.

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Abstract The paper is aimed at detecting CO2 emissions from heating process of households in Veľké Turovce. It offers solutions for 100 % and 20 % replacement of conventional fuels by solar collector systems. In the village, 242 households heat by natural gas during average length of 21 weeks a year. Average amount of energy consumed in heating process after conversion is 18,503.06 kWh per household. For 100 % replacement of natural gas, 63 units of vacuum tube solar collector type Watt CP C 9 are required. In average duration of 23 weeks a year, 12 households heat by brown coal with average c

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Iaccarino, Gianluca, and Stéphane Moreau. "Natural and Forced Conjugate Heat Transfer in Complex Geometries on Cartesian Adapted Grids." Journal of Fluids Engineering 128, no. 4 (2005): 838–46. http://dx.doi.org/10.1115/1.2201625.

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The Cartesian incompressible RANS solver with immersed boundaries, IBRANS, recently developed at Stanford, has been extended to include conjugate heat transfer modeling and used for the simulation of the electrical motor of an automotive engine cooling fan system. Such applications are particularly challenging, as they involve very complex geometries with tight tolerances and rotating parts. The new conjugate heat transfer capability of IBRANS has been verified on natural and forced convection flows. The former involves flows in enclosures around a sphere and electronic chips. The latter focus

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Bespalko, Sergii, Alberto Munoz Miranda, and Oleksii Halychyi. "Overview of the existing heat storage technologies: sensible heat." Acta Innovations, no. 28 (July 1, 2018): 82–113. http://dx.doi.org/10.32933/actainnovations.28.8.

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Over the past several decades, much attention has been given to the development of technologies utilizing solar energy to generate inexpensive and clean heat for heating purposes of buildings and even for electricity generation in the concentrating solar thermal power (CSTP) plants. However, unlike conventional heatgenerating technologies consuming coal, natural gas, and oil, heat produced by solar energy is intermittent because it is significantly affected by daily (day-night) and seasonal fluctuations in solar insolation. This fact issues a considerable challenge to the adoption of solar ene

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Khan, Waqar A., A. M. Rashad, S. M. M. EL-Kabeir, and A. M. A. EL-Hakiem. "Framing the MHD Micropolar-Nanofluid Flow in Natural Convection Heat Transfer over a Radiative Truncated Cone." Processes 8, no. 4 (2020): 379. http://dx.doi.org/10.3390/pr8040379.

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Recently, nanoparticles have supplied diverse challenges in the area of science. The nanoparticles suspended in several conventional fluids can convert the fluids flow and heat transmission features. In this investigation, the mathematical approach is utilized to explore the magnetohydrodynamics micropolar-nanofluid flow through a truncated porous cone. In this mathematical model, non-linear radiation and suction/injection phenomena are also scrutinized with the Tiwari-Das nanoliquid pattern. The designed system of the mathematical model of the boundary value problem is converted to a set of d

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Chen, Yue Hui, Li Deng, Zhong Biao Man, and Miao Yang. "Effect of In Situ Surface Modificated Nano-Zinc Oxide on the Curing Structure and Property of Natural Rubber Conventional Vulcanization." Advanced Materials Research 236-238 (May 2011): 1757–60. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1757.

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In-situ surface modificated nano-zinc oxide was prepared in sol-gel method and the microscopic structure of the zinc oxide particles was analyzed by transmission electron microscopy (TEM). The influence of the nano-zinc oxide on the physical properties of NR vulcanizates was investigated, and the vulcanizates heat-resistant oxygen aging property was studied by the hot air accelerated aging method. Therefore, not only can the strength and elongation properties of vulcanizates greatly be improved, but aslo the heat oxygen aging property of vulcanizate rubber was extremely promoted.

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SAXENA, ROHIT, ADITI SONI, S. N. SAXNA, S. S. RATHORE, and P. BARNWAL. "CRYOGENIC GRINDING: A PHYSICAL TECHNIQUE TO RETAIN VOLATILE CONTENT IN NATURAL PRODUCTS." International Journal of Modern Physics: Conference Series 22 (January 2013): 589–92. http://dx.doi.org/10.1142/s2010194513010714.

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Cryogenics is the study of the production of very low temperature (below −150°C, −238°F or 123K) and the behavior of materials at those temperatures. Similarly, cryogenic grinding is a term supported by the act of grinding a thing at very low temperature. This technique is generally used to grind the material, which contains heat labile constituents viz- volatile oils in seed spices. Due to high fat content in spices, heat is generated, while energy is used to fracture a particle into a smaller size in conventional grinding process. During the normal grinding process, this generated heat cause

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Monaghan, P. F., D. P. Finn, and J. M. O’Reilly. "Wind Evaporator Heat Pumps—Part I: Test Methods." Journal of Energy Resources Technology 114, no. 4 (1992): 281–85. http://dx.doi.org/10.1115/1.2905954.

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Wind evaporators are alternative evaporators for air source heat pumps which rely on wind-driven or natural convection to move air across the heat transfer surfaces. It is believed that, in certain climates, wind evaporators can operate satisfactorily with frost on their surfaces for extended periods of time and defrost passively during switch-off periods. If so, an active defrost cycle would be unnecessary in these climates. Wind evaporators present an opportunity for heat pumps to be less expensive, more reliable, and more energy-efficient. However, the heat transfer performance of wind evap

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Sztekler, Karol, Wojciech Kalawa, Sebastian Stefański, et al. "The influence of adsorption chillers on CHP power plants." MATEC Web of Conferences 240 (2018): 05033. http://dx.doi.org/10.1051/matecconf/201824005033.

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The simultaneous production of electricity, heat and cooling, the so-called trigeneration, allows for substantial savings in the chemical energy of fuels. More efficient use of the primary energy contained in fuels translates into tangible earnings for power plants while reductions in the amounts of fuel burned, and of non-renewable resources in particular, certainly have a favourable impact on the natural environment. The main aim of the above-described project was to analyse the influence of use adsorption contacted to conventional CHP power plant. An adsorption chiller is an item of industr

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Guerrero Delgado, MCarmen, José Sánchez Ramos, Servando Álvarez Domínguez, Francisco Toral Ulloa, and José Antonio Tenorio Ríos. "Evaporative Mist Cooling as Heat Dissipation Technique: Experimental Assessment and Modelling." Applied Sciences 10, no. 17 (2020): 6026. http://dx.doi.org/10.3390/app10176026.

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The severity of extreme weather conditions brought on by climate change are conditioning quality of life, economic development, and well-being in today’s cities. Conventional measures have been shown to be insufficient for tackling climate change and must be supplemented with ecofriendly approaches. Hence, the scientific community’s endeavor to develop natural cooling techniques that lower energy consumption while delivering satisfactory comfort levels. For its simplicity and low cost, evaporative cooling has gained in popularity in recent years. The substantial cooling power to be drawn from

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