Relevant bibliographies by topics / Heat transfer coefficient

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Heat transfer coefficient'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 June 2025

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Journal articles on the topic "Heat transfer coefficient"

1

English, M. J., and T. M. Hemmerling. "Heat transfer coefficient." European Journal of Anaesthesiology 25, no. 7 (2008): 531–37. http://dx.doi.org/10.1017/s0265021508003931.

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Hollworth, B. R., and L. R. Gero. "Entrainment Effects on Impingement Heat Transfer: Part II—Local Heat Transfer Measurements." Journal of Heat Transfer 107, no. 4 (1985): 910–15. http://dx.doi.org/10.1115/1.3247520.

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Convective heat transfer was measured for a heated axisymmetric air jet impinging on a flat surface. It was found that the local heat transfer coefficient does not depend explicitly upon the temperature mismatch between the jet fluid and the ambient fluid if the convection coefficient is defined in terms of the difference between the local recovery temperature and target surface temperature. In fact, profiles of local heat transfer coefficients defined in this manner were found to be identical to those measured for isothermal impinging jets.
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Li, Ya Nan, Yong An Zhang, Xi Wu Li, et al. "Effects of Heat Transfer Coefficients on Quenching Residual Stresses in 7055 Aluminum Alloy." Materials Science Forum 877 (November 2016): 647–54. http://dx.doi.org/10.4028/www.scientific.net/msf.877.647.

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The quenching process can produce great residual stresses in 7055 aluminum alloy plates. The main factor that affects the quenching residual stresses is the heat transfer coefficient in the quenching process. In this paper, the heat transfer coefficients of spray quenching under different spray water flows were measured by using the inverse method, and the heat transfer coefficients of immersion quenching under different water temperatures were measured by the iterative method. The heat transfer coefficient increases as the spray water flow increases while decreases as the water temperature increases. The basic differences of water temperatures/spray water flows/quenching methods are the different heat transfer coefficients. According to the heat transfer coefficients results of immersion and spray quenching, an orthogonal test was carried out to study the effects of heat transfer coefficients in different temperature regions on the quenching residual stresses. The heat transfer coefficients in the range of 100oC ~200oC have a great influence on the quenching residual stresses, especially for the heat transfer coefficient near 150oC.
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Taslim, M. E., and V. Nezym. "A New Statistical-Based Correlation for the Rib Fin Effects on the Overall Heat Transfer Coefficient in a Rib-Roughened Cooling Channel." International Journal of Rotating Machinery 2007 (2007): 1–11. http://dx.doi.org/10.1155/2007/68684.

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Heat transfer coefficients in the cooling cavities of turbine airfoils are greatly enhanced by the presence of discrete ribs on the cavity walls. These ribs introduce two heat transfer enhancing features: a significant increase in heat transfer coefficient by promoting turbulence and mixing, and an increase in heat transfer area. Considerable amount of data are reported in open literature for the heat transfer coefficients both on the rib surface and on the floor area between the ribs. Many airfoil cooling design software tools, however, require an overall average heat transfer coefficient on a rib-roughened wall. Dealing with a complex flow circuit in conjunction with180∘bends, numerous film holes, trailing-edge slots, tip bleeds, crossover impingement, and a conjugate heat transfer problem; these tools are not often able to handle the geometric details of the rib-roughened surfaces or local variations in heat transfer coefficient on a rib-roughened wall. On the other hand, assigning an overall area-weighted average heat transfer coefficient based on the rib and floor area and their corresponding heat transfer coefficients will have the inherent error of assuming a 100% fin efficiency for the ribs, that is, assuming that rib surface temperature is the same as the rib base temperature. Depending on the rib geometry, this error could produce an overestimation of up to 10% in the evaluated rib-roughened wall heat transfer coefficient. In this paper, a correction factor is developed that can be applied to the overall area-weighted average heat transfer coefficient that, when applied to the projected rib-roughened cooling cavity walls, the net heat removal from the airfoil is the same as that of the rib-roughened wall. To develop this correction factor, the experimental results of heat transfer coefficients on the rib and on the surface area between the ribs are combined with about 400 numerical conduction models to determine an overall equivalent heat transfer coefficient that can be used in airfoil cooling design software. A well-known group method of data handling (GMDH) scheme was then utilized to develop a correlation that encompasses most pertinent parameters including the rib geometry, rib fin efficiency, and the rib and floor heat transfer coefficients.
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Barrow, H. "On average heat transfer coefficient." International Journal of Heat and Fluid Flow 7, no. 3 (1986): 162–63. http://dx.doi.org/10.1016/0142-727x(86)90015-9.

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Su, Yu. "Finite Element Simulation of Enhanced Cooling Cutting of Stainless Steel." Applied Mechanics and Materials 312 (February 2013): 445–49. http://dx.doi.org/10.4028/www.scientific.net/amm.312.445.

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This paper develops a 2D finite element model for the enhanced cooling cutting of stainless steel. The enhanced cooling effect is modeled with a convective heat transfer coefficient assigned to a heat transfer window of cutting zone. Five convective heat transfer coefficients are defined to simulate different enhanced cooling effects. The simulation results suggest that increase of convective heat transfer coefficient results in a very small reduction of maximum tool-chip interface temperature, even when a very large convective heat transfer coefficient is used. In addition, no significant effect on cutting force and thrust force is observed with the increase of convective heat transfer coefficient.
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Sarafraz, M. M., S. M. Peyghambarzadeh, and Alavi Fazel. "Experimental studies on nucleate pool boiling heat transfer to ethanol/MEG/DEG ternary mixture as a new coolant." Chemical Industry and Chemical Engineering Quarterly 18, no. 4-1 (2012): 577–86. http://dx.doi.org/10.2298/ciceq111116033s.

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In this paper, nucleate pool boiling heat transfer coefficient of ternary mixtures of ethanol, monoethylene glycol (MEG) and diethylene glycol (DEG) as a new coolant with higher heat transfer coefficient has been investigated. Therefore, at varied concentrations of MEG and DEG and also at different heat fluxes, pool boiling heat transfer coefficients, have been experimentally measured. Results demonstrated the higher heat transfer coefficient in comparison with Water/MEG/DEG ternary mixture. In particular, at high heat fluxes, for ethanol/MEG/DEG mixture, higher boiling heat transfer coefficient is reported. Besides, experimental data were compared to well-known existing correlations. Results of this comparison express that the most accurate correlation for predicting the heat transfer coefficient of ethanol/MEG/DEG is modified Stephan - Preu?er which has been obtained in our earlier work.
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Wan, Junchi. "The Heat Transfer Coefficient Predictions in Engineering Applications." Journal of Physics: Conference Series 2108, no. 1 (2021): 012022. http://dx.doi.org/10.1088/1742-6596/2108/1/012022.

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Abstract Most engineering applications have boundary layers; the convective transport of mass, momentum and heat normally occurs through a thin boundary layer close to the wall. It is essential to predict the boundary layer heat transfer phenomenon on the surface of various engineering machines through calculations. The experimental, analogy and numerical methods are the three main methods used to obtain convective heat transfer coefficient. The Reynolds analogy provides a useful method to estimate the heat transfer rate with known surface friction. In the Reynolds analogy, the heat transfer coefficient is independent of the temperature ratio between the wall and the fluid. Other methods also ignore the effect of the temperature ratio. This paper summarizes the methods of predicting heat transfer coefficients in engineering applications. The effects of the temperature ratio between the wall and the fluid on the heat transfer coefficient predictions are studied by summarizing the researches. Through the summary, it can be found that the heat transfer coefficients do show a dependence on the temperature ratio. And these effects are more obvious in turbulent flow and pointing out that the inaccuracy in the determination of the heat transfer coefficient and proposing that the conjugate heat transfer analysis is the future direction of development.
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Apmann, Kevin, Ryan Fulmer, Branden Scherer, Sawyer Good, Jake Wohld, and Saeid Vafaei. "Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels." Nanomaterials 12, no. 4 (2022): 615. http://dx.doi.org/10.3390/nano12040615.

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The purpose of this paper is to investigate the effects of a connector between two microchannels, for the first time. A brief literature review is provided to offer a better understanding on the impacts of concentration and the characteristics of nanoparticles on thermal conductivity, viscosity, and, consequently, the heat transfer coefficient inside the microchannels. The given literature review aims to help engineer nanofluids to enhance the heat transfer coefficient inside the microchannels. In this research, Fe3O4 nanoparticles were introduced into the base liquid to enhance the heat transfer coefficient inside the microchannels and to provide a better understanding of the impact of the connector between two microchannels. It was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel, by increasing the level of randomness of molecules and particles prior to entering the second channel. The connector would act to refresh the memory of the fluid before entering the second channel, and as a result, the heat transfer coefficient in the second channel would start at a maximum value. Therefore, the overall heat transfer coefficient in both microchannels would increase for given conditions. The impacts of the Reynolds number and introducing nanoparticles in the base liquid on effects induced by the connector were investigated, suggesting that both factors play a significant role on the connector’s impact on the heat transfer coefficient.
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Taslim, M. E., and C. M. Wadsworth. "An Experimental Investigation of the Rib Surface-Averaged Heat Transfer Coefficient in a Rib-Roughened Square Passage." Journal of Turbomachinery 119, no. 2 (1997): 381–89. http://dx.doi.org/10.1115/1.2841122.

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Turbine blade cooling, a common practice in modern aircraft engines, is accomplished, among other methods, by passing the cooling air through an often serpentine passage in the core of the blade. Furthermore, to enhance the heat transfer coefficient, these passages are roughened with rib-shaped turbulence promoters (turbulators). Considerable data are available on the heat transfer coefficient on the passage surface between the ribs. However, the heat transfer coefficients on the surface of the ribs themselves have not been investigated to the same extent. In small aircraft engines with small cooling passages and relatively large ribs, the rib surfaces comprise a large portion of the passage heat transfer area. Therefore, an accurate account of the heat transfer coefficient on the rib surfaces is critical in the overall design of the blade cooling system. The objective of this experimental investigation was to conduct a series of 13 tests to measure the rib surface-averaged heat transfer coefficient, hrib, in a square duct roughened with staggered 90 deg ribs. To investigate the effects that blockage ratio, e/Dh and pitch-to-height ratio, S/e, have on hrib and passage friction factor, three rib geometries corresponding to blockage ratios of 0.133, 0.167, and 0.25 were tested for pitch-to-height ratios of 5, 7, 8.5, and 10. Comparisons were made between the rib average heat transfer coefficient and that on the wall surface between two ribs, hfloor, reported previously. Heat transfer coefficients of the upstream-most rib and that of a typical rib located in the middle of the rib-roughened region of the passage wall were also compared. It is concluded that: 1 The rib average heat transfer coefficient is much higher than that for the area between the ribs; 2 similar to the heat transfer coefficient on the surface between the ribs, the average rib heat transfer coefficient increases with the blockage ratio; 3 a pitch-to-height ratios of 8.5 consistently produced the highest rib average heat transfer coefficients amongst all tested; 4 under otherwise identical conditions, ribs in upstream-most position produced lower heat transfer coefficients than the midchannel positions, 5 the upstream-most rib average heat transfer coefficients decreased with the blockage ratio; and 6 thermal performance decreased with increased blockage ratio. While a pitch-to-height ratio of 8.5 and 10 had the highest thermal performance for the smallest rib geometry, thermal performance of high blockage ribs did not change significantly with the pitch-to-height ratio.
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Dissertations / Theses on the topic "Heat transfer coefficient"

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Webber, Helen. "Compact heat exchanger heat transfer coefficient enhancement." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540881.

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Macbeth, Tyler James. "Conjugate Heat Transfer and Average Versus Variable Heat Transfer Coefficients." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5801.

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An average heat transfer coefficient, h_bar, is often used to solve heat transfer problems. It should be understood that this is an approximation and may provide inaccurate results, especially when the temperature field is of interest. The proper method to solve heat transfer problems is with a conjugate approach. However, there seems to be a lack of clear explanations of conjugate heat transfer in literature. The objective of this work is to provide a clear explanation of conjugate heat transfer and to determine the discrepancy in the temperature field when the interface boundary condition is approximated using h_bar compared to a local, or variable, heat transfer coefficient, h(x). Simple one-dimensional problems are presented and solved analytically using both h(x) and h_bar. Due to the one-dimensional assumption, h(x) appears in the governing equation for which the common methods to solve the differential equations with an average coefficient are no longer valid. Two methods, the integral equation and generalized Bessel methods are presented to handle the variable coefficient. The generalized Bessel method has previously only been used with homogeneous governing equations. This work extends the use of the generalized Bessel method to non-homogeneous problems by developing a relation for the Wronskian of the general solution to the generalized Bessel equation. The solution methods are applied to three problems: an external flow past a flat plate, a conjugate interface between two solids and a conjugate interface between a fluid and a solid. The main parameter that is varied is a combination of the Biot number and a geometric aspect ratio, A_1^2 = Bi*L^2/d_1^2. The Biot number is assumed small since the problems are one-dimensional and thus variation in A_1^2 is mostly due to a change in the aspect ratio. A large A_1^2 represents a long and thin solid whereas a small A_1^2 represents a short and thick solid. It is found that a larger A_1^2 leads to less problem conjugation. This means that use of h_bar has a lesser effect on the temperature field for a long and thin solid. Also, use of ¯ over h(x) tends to generally under predict the solid temperature. In addition is was found that A_2^2, the A^2 value for the second subdomain, tends to have more effect on the shape of the temperature profile of solid 1 and A_1^2 has a greater effect on the magnitude of the difference in temperature profiles between the use of h(x) and h_bar. In general increasing the A^2 values reduced conjugation.
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Hussein, Mohammed Sabah. "Coefficient identification problems in heat transfer." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/12291/.

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The aim of this thesis is to find the numerical solution for various coefficient identification problems in heat transfer and extend the possibility of simultaneous determination of several physical properties. In particular, the problems of coefficient identification in a fixed or moving domain for one and multiple unknowns are investigated. These inverse problems are solved subject to various types of overdetermination conditions such as non-local, heat flux, Cauchy data, mass/energy specification, general integral type overdetermination, time-average condition, time-average of heat flux, Stefan condition and heat momentum of the first and second order. The difficulty associated with these problems is that they are ill-posed, as their solutions are unstable to inclusion of random noise in input data, therefore traditional techniques fail to provide accurate and stable solutions. Throughout this thesis, the Crank-Nicolson finite-difference method (FDM) is mainly used as a direct solver except in Chapter 7 where a three-level scheme is employed in order to deal with the nonlinear heat equation. An explicit FDM scheme is also employed in Chapter 10 for the two-dimensional case. The inverse problems investigated are discretised using the FDM and recast as nonlinear least-squares minimization problems with simple bounds on the unknown coefficients. The resulting problem is efficiently solved using the \emph{fmincon} or \emph{lsqnonlin} routines from MATLAB optimization toolbox. The Tikhonov regularization method is included where necessary. The choice of the regularization parameter(s) is thoroughly discussed. The stability of the numerical solution is investigated by introducing Gaussian random noise into the input data. The numerical solutions are compared with their known analytical solution, where available, and with the corresponding direct problem numerical solution where no analytical solution is available.
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Ammari, H. D. "The heat transfer coefficient on film cooled surfaces." Thesis, University of Nottingham, 1989. http://eprints.nottingham.ac.uk/12730/.

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A systematic investigation of the effects of coolant-to-mainstream density ratio and mainstream acceleration on the heat transfer following injection through a row of holes in a flat plate into a turbulent boundary layer is described. A mass transfer technique was employed which uses a swollen polymer surface and laser holographic interferometry. The constant concentration of the test surface simulated isothermal conditions. Density ratios in excess of unity, representative of gas turbine operating conditions, were obtained using foreign gas injection into mainstream air. The experimental technique was validated for such measurements. The cooling film heat transfer coefficient was measured for a range of blowing configurations and flow conditions; the holes were spaced at three diameter intervals and inclined at 35° or 90° to the mainstream, and the ranges of the other pertinent test parameters covered were, 0.5 5 blowing rate 5 2.0, 1.0 5 density ratio S 1.52, and 0.0 S acceleration parameter S 5x 10'. However, the tests with mainstream acceleration were performed with 35° injection only. The heat transfer coefficient was found to be increased by injection, and with the blowing rate for both 35° and 90° injection. Close to the injection site, normal blowing produced higher heat transfer coefficients than angled blowing, but gave lower coefficients far downstream. There were large differences in behaviour between the two injection angles with varying density ratio. For normal injection, the heat transfer coefficient at a fixed blowing rate was insensitive to the variation of density ratio, whereas for 35° injection strong dependence was observed, an increase in the density ratio leading to a decrease in the coefficient. Similar behaviour for the inclined injection case was also found in the presence of strong favourable pressure gradient. As mainstream acceleration acts to suppress injection induced turbulence, the heat transfer coefficient under the film with and without density ratio was found to decrease in the presence of mainstream acceleration relative to that in absence of acceleration. The heat transfer coefficient was observed to relate to the acceleration parameter in an approximately linear manner, an increase in the acceleration resulting in a decrease in the coefficient. For normal injection, good scaling of the heat transfer coefficient including density ratios was achieved with the blowing parameter. For 35° injection, the coolant to mainstream velocity ratio was seen to scale the data best. Correlations for the heat transfer data using these scaling parameters. With these correlations data obtained at density ratios not representative of gas turbine practice can be adapted for design calculations. The predictions of a computational fluid dynamics general purpose program called PHOENICS were tested against the present measurements and those of others. In general, the computed results of film cooling effectiveness agreed reasonably well with available experimental data. The ability to predict the heat transfer coefficient associated with film cooling was satisfactory for normal injection, but not as satisfactory for injection through 35° holes.
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Haam, Seungjoo. "Local heat transfer in a mixing vessel using heat flux sensors." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1102528786.

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Tothill, M. H. "Turbine blade heat transfer coefficient determination using optical pyrometry." Thesis, Cranfield University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352954.

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Wells, Robert G. "Laminar flow with an axially varying heat transfer coefficient." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101333.

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A theoretical study of convective heat transfer is presented for a laminar flow subjected to an axial variation in the external heat transfer coefficient (or dimensionless Biot number). Since conventional techniques fail for a variable boundary condition parameter, a variable eigenfunction approach is developed. An analysis is carried out for a periodic heat transfer coefficient, which serves as a model for heat transfer from a duct fitted with an array of evenly spaced fins. Three solution methods for the variable eigenfunction technique are examined: an Nth order approximation method, an iterative method and a stepwise periodic method. The stepwise periodic method provides the most convenient and accurate solution for a stepwise periodic Biot number. Graphical results match exactly to ones obtained by Charmchi and Sparrow from a finite-difference scheme. A connected region technique is also developed to provide limited exact results to test the validity of the three solution methods. The study of a finned duct by a stepwise periodic Biot number is carried out via a parametric study, an average (constant) Biot number approximation and an assumed velocity profile analysis. Results for the parametric study show that external finning yields substantial heat transfer enhancement over an unfinned duct, especially when the Biot number of the unfinned regions is low. A decrease in the interfin spacing causes increased enhancement. Variations of the period of the Biot number causes relatively small changes in enhancement as long as the ratio of finned to unfinned surface remains unchanged. An average (constant) Biot number approximation for a specified finned tube is compared to the stepwise periodic Biot number solution. The results show that the constant Biot number approximation provides accurate results. Finally, the results for the influence of the assumed velocity profile demonstrate that a constant velocity flow provides increased heat transfer and more effective enhancement by external finning than a laminar fully developed flow, especially at high Biot numbers. This study provides insight into heat transfer enhancement due to finning and also develops a solution methodology for problems involving variable boundary condition parameters.<br>M.S.
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Li, Ke. "Experimental Study of Heat Transfer Coefficient and Film Cooling Effectiveness." Thesis, KTH, Energiteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-249061.

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This thesis investigates the possibility to evaluate the film cooling thermal performance on flat plate using Thermochromic Liquid Crystal. After an introduction of the basic concept and background of gas turbine blades film cooling and Thermochromic Liquid Crystal, a thorough explanation of four methods is presented. Dimensional or similarity analysis is implemented to build relationship between real engine and laboratory model. Also, the Reynolds number and Blowing ratio are the fundamental of test object design and TLC selection. This study illustrated the layout of the test rig and corresponding setups, and the following part explains the data collection system and image processing MATLAB script which is vital for the success of data extraction. The least square method is applied to figure time-series optimal solution in solver. All the experiments are conducted at near room temperature as opposed to the extremely high gas turbine exhausted gas, including two calibration test and one heat transfer experiment. The heat transfer coefficient and film cooling effectiveness are the target objective through the entire project. By comparison with a similar experiment in a literature, the outcomes partially validated the film cooling performance under the pre-set flow and thermal condition and the Liquid Crystal thermography technique is proved to be a trustworthy method to mapping heat transfer surface.<br>Denna avhandling undersöker möjligheten att utvärdera filmkylningens termiska prestanda på plan platta med användning av Termokromisk Flytande Kristall (TLC). Efter en introduktion av grundkonceptet och bakgrunden till gasturbinbladens filmkylning och termokromisk flytande kristall presenteras en grundlig förklaring av fyra metoder. Dimensionell eller likhetsanalys implementeras för att bygga upp förhållandet mellan verklig motor och laboratoriemodell. Reynoldstalet och blåsningsförhållandet (blowing ratio) är också grunden för testobjektdesign och TLC-val. Denna studie illustrerade provriggens layout och tillhörande inställningar. I följande del förklaras datainsamlingssystemet och bildbehandling, MATLABTM-skriptet som är avgörande för framgång med datautvärdering. Den minsta kvadratiska metoden tillämpas för att hitta tidsseriens optimala lösning i lösaren. Alla experiment utförs vid nära rumstemperatur i motsats till den höga temperature på gasturbingasen, inklusive två kalibreringstest och ett värmeöverföringsexperiment. Värmeöverföringskoefficienten och filmkylningseffektiviteten är målmålet genom hela projektet. Resultaten validerade partiellt filmkylningens prestanda under det förinställda flödet och det termiska tillståndet. Liquid Crystal-termografitekniken har visat sig vara en pålitlig metod för att kartlägga värmeöverföringsytan jämfört med ett liknande experiment i den öppna litteraturen.
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Skosana, Petrus Jabu. "Wall Heat Transfer Coefficient in a Molten Salt Bubble Column." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46246.

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The Council for Scientific and Industrial Research (CSIR) is developing a novel process to produce titanium metal at a lower cost than the current Kroll process used commercially. The technology initiated by the CSIR will benefit South Africa in achieving the long-term goal of establishing a competitive titanium metal industry. A bubble column reactor is one of the suitable reactors that were considered for the production of titanium metal. This reactor will be operated with a molten salt medium. Bubble columns are widely used in various fields of process engineering, such as oxidation, hydrogenation, fermentation, Fischer–Tropsch synthesis and waste water treatment. The advantages of these reactors over other multiphase reactors are simple construction, good mass and heat transfer, absence of moving parts and low operating costs. High heat transfer is important in reactors when high thermal duties are required. An appropriate measurement of the heat transfer coefficient is of primary importance for designing reactors that are highly exothermic or endothermic. An experimental test facility to measure wall heat transfer coefficients was constructed and operated. The experimental setup was operated with tap water, heat transfer oil 32 and lithium chloride–potassium chloride (LiCl–KCl) eutectic by bubbling argon gas through the liquids. The column was operated at a temperature of 40 oC for the water experiments, at 75, 103 and 170 oC for the heat transfer oil experiments, and at 450 oC for the molten salt experiments. All the experiments were run at superficial gas velocities in the range of 0.006 to 0.05 m/s. Three heating tapes, each connected to a corresponding variable AC voltage controller, were used to heat the column media. Heat transfer coefficients were determined by inducing a known heat flux through the column wall and measuring the temperature difference between the wall and the reactor contents. In order to balance the system, heat was removed by cooling water flowing through a copper tube on the inside of the column. Temperature differences between the column wall and the liquid were measured at five axial locations. A mechanistic model for estimating the kinematic turbulent viscosity and dispersion coefficient was developed from a mechanism of momentum exchange between large circulation cells. By analogy between heat and momentum transfer, these circulation cells also transfer heat from the wall to the liquid. There were some challenges when operating the bubble column with molten salt due to leakages on the welds and aggressive corrosion of the column. The experimental results were obtained when operating the column with water and heat transfer oil. It was found that the heat transfer coefficient increases with superficial gas velocity. The values of the heat transfer coefficient for the argon–water system were higher than those for the argon–heat transfer oil system. The heat transfer coefficients were also found to increase with an increase in temperature. Gas holdup increased with the superficial gas velocity. It was found that the estimated axial dispersion coefficients are within the range of those reported in the literature and the ratios of dispersion coefficients are in agreement with those in the literature. The estimated kinematic turbulent viscosities were comparable with those in the literature.<br>Dissertation (MEng)--University of Pretoria, 2014.<br>tm2015<br>Chemical Engineering<br>MEng<br>Unrestricted
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Jeong, Dahai. "Laboratory Measurements of the Moist Enthalpy Transfer Coefficient." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/145.

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The enthalpy (sensible and latent heat) exchange processes within the surface layers at an air-water interface have been examined in 15-m wind-wave tunnel at the University of Miami. Measurements yielded 72 mean values of fluxes and bulk variables in the wind speed (referred to 10 m) range form 0.6 to 39 m/s, covering a full range of aerodynamic conditions from smooth to fully rough. Meteorological variables and bulk enthalpy transfer coefficients, measured at 0.2-m height, were adjusted to neutral stratification and 10-m height following the Monin-Obukhov similarity approach. The ratio of the bulk coefficients of enthalpy and momentum was estimated to evaluate Emanuel's (1995) hypothesis. Indirect "Calorimetric" measurements gave reliable estimates of enthalpy flux from the air-water interface, but the moisture gained in the lower air from evaporation of spray over the rough water remained uncertain, stressing the need for flux measurements along with simultaneous spray data to quantify spray's contribution to the turbulent air-water enthalpy fluxes.
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Books on the topic "Heat transfer coefficient"

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T, Dickson, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Technology, and Oak Ridge National Laboratory, eds. Impact of the heat transfer coefficient on pressurized thermal shock. Division of Systems Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Al-Ahmadi, Adel Bin Musaed Sulaiman. Electrohydrodynamic (EHD) enhancement of condensation heat transfer - development of correlation for heat transfer coefficient for tubular systems. University of Birmingham, 2003.

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Nazeri, Habib. The measurement of the heat transfer coefficient between cryolite and ledge. National Library of Canada, 1994.

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E, Poinsatte Philip, and United States. National Aeronautics and Space Administration., eds. Transient liquid-crystal technique used to produce high-resolution convective heat-transfer-coefficient maps. National Aeronautics and Space Administration, 1993.

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E, Poinsatte Philip, and United States. National Aeronautics and Space Administration., eds. Transient liquid-crystal technique used to produce high-resolution convective heat-transfer-coefficient maps. National Aeronautics and Space Administration, 1993.

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E, Poinsatte Philip, and United States. National Aeronautics and Space Administration., eds. Transient liquid-crystal technique used to produce high-resolution convective heat-transfer-coefficient maps. National Aeronautics and Space Administration, 1993.

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A, Hippensteele Steven, and Lewis Research Center, eds. High-resolution heat-transfer-coefficient maps applicable to compound-curve surfaces using liquid crystals in a transient wind tunnel. National Aeronautics and Space Administration, Lewis Research Center, 1988.

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A, Hippensteele Steven, and Lewis Research Center, eds. High-resolution heat-transfer-coefficient maps applicable to compound-curve surfaces using liquid crystals in a transient wind tunnel. National Aeronautics and Space Administration, Lewis Research Center, 1988.

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A, Hippensteele Steven, and Lewis Research Center, eds. High-resolution heat-transfer-coefficient maps applicable to compound-curve surfaces using liquid crystals in a transient wind tunnel. National Aeronautics and Space Administration, Lewis Research Center, 1988.

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Cyril, Masiulaniec K., and United States. National Aeronautics and Space Administration., eds. Experimental technique and assessment for measuring the convective heat transfer coefficient from natural ice accretions. National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Heat transfer coefficient"

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Shang, De-Yi, and Liang-Cai Zhong. "Skin-Friction Coefficient." In Heat and Mass Transfer. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94403-6_7.

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Venkateshan, S. P. "Heat Flux and Heat Transfer Coefficient." In Mechanical Measurements. John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119115571.ch6.

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Venkateshan, S. P. "Heat Flux and Heat Transfer Coefficient." In Mechanical Measurements. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73620-0_6.

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Zudin, Yuri B. "Variable Heat Transfer Coefficient (Heat Conduction Problem)." In Mathematical Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25167-2_13.

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Fujikawa, Shigeo, Takeru Yano, and Masao Watanabe. "Vapor Pressure, Surface Tension, and Evaporation Coefficient for Nanodroplets." In Heat and Mass Transfer. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18038-5_4.

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Herwig, Heinz. "Wärmeübergangskoeffizient α* (heat transfer coefficient h*)." In Wärmeübertragung A-Z. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56940-1_83.

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Pham, Q. Tuan. "Heat Transfer Coefficient and Physical Properties." In Food Freezing and Thawing Calculations. Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0557-7_2.

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Dixon, John M., and Francis A. Kulacki. "Measurement of the Heat Transfer Coefficient." In Mixed Convection in Fluid Superposed Porous Layers. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50787-3_4.

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Shang, De-Yi, and Liang-Cai Zhong. "Skin-Friction Coefficient." In Heat Transfer of Laminar Mixed Convection of Liquid. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27959-6_9.

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Herwig, Heinz. "Wärmedurchgangskoeffizient k* (overall heat transfer coefficient U*)." In Wärmeübertragung A-Z. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56940-1_72.

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Conference papers on the topic "Heat transfer coefficient"

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Michna, Gregory J., Eric A. Browne, Yoav Peles, and Michael K. Jensen. "Single Microjet Heat Transfer." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88216.

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An investigation of the stagnation point heat transfer coefficient of such a single-phase, microscale impinging jet is discussed. Standard MEMS processes were used to fabricate a heat transfer measurement device. In this device, a water jet issued from a 67-μm orifice and impinged on an 80-μm square heated normal surface 200 μm from the orifice. Heat transfer coefficients up to 80,000 W/m2-K were measured. This heat transfer coefficient results in a heat flux greater than 400 W/cm2 given a 50°C temperature difference. However, this heat transfer coefficient is an order-of-magnitude less than that predicted by correlations developed from larger jets. In addition, the heat transfer coefficients were relatively insensitive to Reynolds number. Further investigation of microjet heat transfer is needed to explain this deviation from expected behavior. The pressure drop across the jet orifice was measured, and the calculated pressure loss coefficients agree well with available correlations. Curve fits for the Nusselt number and pressure loss coefficient are given.
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MAS, David, Sebastien VIMEUX, Bertrand CLAUZADE, et al. "Heat exchanger heat transfer coefficient and CFD modelling." In OCEANS 2019 - Marseille. IEEE, 2019. http://dx.doi.org/10.1109/oceanse.2019.8867541.

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Heggs, Peter J. "HEAT TRANSFER IN PARTICULATE SYSTEMS THE INFAMOUS FILM HEAT TRANSFER COEFFICIENT." In International Heat Transfer Conference 10. Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.1990.

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Bediako, Ernest Gyan, Petra Dancova, and Tomas Vit. "Comparison of Experimental Heat Transfer Coefficient with Qualitative Description of Classical Heat Transfer Coefficient at Low Heat Flux Conditions." In 9th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'22). Avestia Publishing, 2022. http://dx.doi.org/10.11159/ffhmt22.185.

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Seidenbecher, Jakob, Claudia Meitzner, Fabian Herz, S. Wirtz, A. Berndt, and V. Scherer. "THE CONVECTIVE HEAT TRANSFER COEFFICIENT IN FLIGHTED ROTARY DRUMS." In International Heat Transfer Conference 16. Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.tpm.022104.

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Rose, John W. "INTERPHASE MATTER TRANSFER, THE CONDENSATION COEFFICIENT AND DROPWISE CONDENSATION." In International Heat Transfer Conference 11. Begellhouse, 1998. http://dx.doi.org/10.1615/ihtc11.2650.

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Seiti Misina, Fernando, Pedro Vieira, and Cristiano Tibiriçá. "Heat transfer coefficient measurements in a pulsating heat pipe." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0789.

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Utomo, Adi T., Ashkan I. T. Zavareh, Heiko Poth, et al. "Heat transfer coefficient of nanofluids in minichannel heat sink." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2012: International Conference of Numerical Analysis and Applied Mathematics. AIP, 2012. http://dx.doi.org/10.1063/1.4756064.

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Cebo-Rudnicka, A., Z. Malinowski, T. Telejko, and J. Gielzecki. "Inverse determination of the heat transfer coefficient distribution on a steel plate cooled by a water spray nozzle." In HEAT TRANSFER 2012. WIT Press, 2012. http://dx.doi.org/10.2495/ht120301.

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Bart, G. C. J., and P. C. van der Laag. "MODELLING OF SOME CONSTANT HEAT TRANSFER COEFFICIENT PHASE CHANGE PROBLEMS." In International Heat Transfer Conference 9. Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.3850.

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Reports on the topic "Heat transfer coefficient"

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Leslie, P., R. Wood, F. Sigler, A. Shapiro, and A. Rendon. Heat transfer coefficient in serpentine coolant passage for CCDTL. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/345040.

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Donovan, William F. Determination of Heat Transfer Coefficient in a Gun Barrel from Experimental Data. Defense Technical Information Center, 1985. http://dx.doi.org/10.21236/ada151815.

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Kedzierski, Mark A., and Donggyu Kang. Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube :. National Institute of Standards and Technology (U.S.), 2017. http://dx.doi.org/10.6028/nist.tn.1966.

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This report presents local convective boiling heat transfer and Fanning friction factor measurements in a micro-fin tube for R134a and two possible low global warming potential (GWP) refrigerant replacements for R134a: R1234yf and R450A. Test section heating was achieved with water in either counterflow or in parallel flow with the test refrigerant to provide for a range of heat fluxes for each thermodynamic quality. An existing correlation from the literature for single and multi-component mixtures was shown to not satisfactorily predict the convective boiling measurements for flow qualities greater than 40 %. Accordingly, a new correlation was developed specifically for the test fluids of this study so that a fair comparison of the heat transfer performance of the low GWP refrigerants to that of R134a could be made. The new correlation was used to compare the heat transfer coefficient of the three test fluids at the same heat flux, saturated refrigerant temperature, and refrigerant mass flux. The resulting example comparison, for the same operating conditions, showed that the heat transfer coefficient of the multi-component R450A and the single-component R1234yf were, on average, 15 % less and 5 % less, respectively, than that of the single-component R134a. Friction factor measurements were also compared to predictions from an existing correlation. A new correlation for the friction factor was developed to provide a more accurate prediction. The measurements and the new models are important for the evaluation of potential low-GWP refrigerants replacements for R134a.
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Howard, Isaac, Thomas Allard, Ashley Carey, Matthew Priddy, Alta Knizley, and Jameson Shannon. Development of CORPS-STIF 1.0 with application to ultra-high performance concrete (UHPC). Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40440.

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This report introduces the first release of CORPS-STIF (Concrete Observations Repository and Predictive Software – Structural and Thermodynamical Integrated Framework). CORPS-STIF is envisioned to be used as a tool to optimize material constituents and geometries of mass concrete placements specifically for ultra-high performance concretes (UHPCs). An observations repository (OR) containing results of 649 mechanical property tests and 10 thermodynamical tests were recorded to be used as inputs for current and future releases. A thermodynamical integrated framework (TIF) was developed where the heat transfer coefficient was a function of temperature and determined at each time step. A structural integrated framework (SIF) modeled strength development in cylinders that underwent isothermal curing. CORPS-STIF represents a step toward understanding and predicting strength gain of UHPC for full-scale structures and specifically in mass concrete.
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Searle, Matthew, James Black, Douglas Straub, et al. Measuring Heat Transfer Coefficients for Supercritical Carbon Dioxide Cycle Recuperators. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1834779.

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Bell, J., and L. Hand. Calculation of Mass Transfer Coefficients in a Crystal Growth Chamber through Heat Transfer Measurements. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/918405.

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Seginer, Ido, Daniel H. Willits, Michael Raviv, and Mary M. Peet. Transpirational Cooling of Greenhouse Crops. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7573072.bard.

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Background Transplanting vegetable seedlings to final spacing in the greenhouse is common practice. At the time of transplanting, the transpiring leaf area is a small fraction of the ground area and its cooling effect is rather limited. A preliminary modeling study suggested that if water supply from root to canopy is not limiting, a sparse crop could maintain about the same canopy temperature as a mature crop, at the expense of a considerably higher transpiration flux per leaf (and root) area. The objectives of this project were (1) to test the predictions of the model, (2) to select suitable cooling methods, and (3) to compare the drought resistance of differently prepared seedlings. Procedure Plants were grown in several configurations in high heat load environments, which were moderated by various environmental control methods. The difference between the three experimental locations was mainly in terms of scale, age of plants, and environmental control. Young potted plants were tested for a few days in small growth chambers at Technion and Newe Ya'ar. At NCSU, tomato plants of different ages and planting densities were compared over a whole growing season under conditions similar to commercial greenhouses. Results Effect of spacing: Densely spaced plants transpired less per plant and more per unit ground area than sparsely spaced plants. The canopy temperature of the densely spaced plants was lower. Air temperature was lower and humidity higher in the compartments with the densely spaced plants. The difference between species is mainly in the canopy-to-air Bowen ratio, which is positive for pepper and negative for tomato. Effect of cooling methods: Ventilation and evaporative pad cooling were found to be effective and synergitic. Air mixing turned out to be very ineffective, indicating that the canopy-to-air transfer coefficient is not the limiting factor in the ventilation process. Shading and misting, both affecting the leaf temperature directly, proved to be very effective canopy cooling methods. However, in view of their side effects, they should only be considered as emergency measures. On-line measures of stress: Chlorophyll fluorescence was shown to accurately predict photosynthesis. This is potentially useful as a rapid, non-contact way of assessing canopy heat stress. Normalized canopy temperature and transpiration rate were shown to correlate with water stress. Drought resistance of seedlings: Comparison between normal seedlings and partially defoliated ones, all subjected to prolonged drought, indicated that removing about half of the lowermost leaves prior to transplanting, may facilitate adjustment to the more stressful conditions in the greenhouse. Implications The results of this experimental study may lead to: (1) An improved model for a sparse canopy in a greenhouse. (2) A better ventilation design procedure utilizing improved estimates of the evaporation coefficient for different species and plant configurations. (3) A test for the stress resistance of transplants.
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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems. Department of the Built Environment, Aalborg University, 2022. http://dx.doi.org/10.54337/aau467469997.

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Heat pumps are an excellent solution to supply heating and cooling for indoor space conditioning and domestic hot water production. Conventional heat pumps are typically electrically driven and operate with a vapour-compression thermodynamic cycle of refrigerant fluid to transfer heat from a cold source to a warmer sink. This mature technology is cost-effective and achieves appreciable coefficients of performance (COP). The heat pump market demand is driven up by the urge to improve the energy efficiency of building heating systems coupled with the increase of global cooling needs for air-conditioning. Unfortunately, the refrigerants used in current conventional heat pumps can have a large greenhouse or ozone-depletion effect. Alternative gaseous refrigerants have been identified but they present some issues regarding toxicity, flammability, explosivity, low energy efficiency or high cost. However, several non-vapour-compression heat pump technologies have been invented and could be promising alternatives to conventional systems, with potential for higher COP and without the aforementioned refrigerant drawbacks. Among those, the systems based on the so-called “caloric effects” of solid-state refrigerants are gaining large attention. These caloric effects are characterized by a phase transition varying entropy in the material, resulting in a large adiabatic temperature change. This phase transition is induced by a variation of a specific external field applied to the solid refrigerant. Therefore, the magnetocaloric, elastocaloric, electrocaloric and barocaloric effects are adiabatic temperature changes in specific materials when varying the magnetic field, uniaxial mechanical stress, electrical field or hydrostatic pressure, respectively. Heat pump cycle can be built from these caloric effects and several heating/cooling prototypes were developed and tested over the last few decades. Although not a mature technology yet, some of these caloric systems are well suited to become new efficient and sustainable solutions for indoor space conditioning and domestic hot water production. This technical report (and the paper to which this report is supplementary materials) aims to raise awareness in the building community about these innovative caloric systems. It sheds some light on the recent progress in that field and compares the performance of caloric systems with that of conventional vapour-compression heat pumps for building applications.
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Horizontal nucleate flow boiling heat transfer coefficient measurements and visual observations for R12, R134a, and R134aEster lubricant mixtures. National Institute of Standards and Technology, 1993. http://dx.doi.org/10.6028/nist.ir.5144.

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POST-FIRE BEHAVIOR OF CROSS-SHAPED STEEL REINFORCED CONCRETE COLUMNS: SIMULATION AND ANALYTICAL EXPRESSIONS. The Hong Kong Institute of Steel Construction, 2023. http://dx.doi.org/10.18057/ijasc.2023.19.2.9.

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In order to explore the behavior of cross-shaped steel reinforced concrete (SRC) columns after fire, the heat transfer analysis model and structural analysis model were established by ABAQUS software. The simulation results of the cross-shaped column were compared with the existing test results, in the aspect of the temperature distribution, time-temperature curve, failure mode, and load-displacement relationship after fire exposure. The results show that the simulation results agree well with the experimental results. The influence of critical parameters on residual bearing capacity coefficient k was discussed, which including constant heating duration, maximum heating temperature, concrete strength, yield strength of section steel, yield strength of rebars, limb thickness, effective column length, rebar diameter, and steel content. Finally, a simplified formula was proposed to calculate the residual bearing capacity of cross-shaped SRC columns after fire.
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