Academic literature on the topic 'Heat Flux Meter'
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Journal articles on the topic "Heat Flux Meter"
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Brajuskovic, Branislav, and Naim Afgan. "A heat flux-meter for ash deposit monitoring systems—II. ‘Clean’ heat flux-meter characteristics." International Journal of Heat and Mass Transfer 34, no. 9 (September 1991): 2303–15. http://dx.doi.org/10.1016/0017-9310(91)90056-k.
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Martins, N., H. Calisto, N. Afgan, and A. I. Leontiev. "The transient transpiration heat flux meter." Applied Thermal Engineering 26, no. 14-15 (October 2006): 1552–55. http://dx.doi.org/10.1016/j.applthermaleng.2005.11.027.
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Watts, D. B., E. T. Kanemasu, and C. B. Tanner. "Modified heat-meter method for determining soil heat flux." Agricultural and Forest Meteorology 49, no. 4 (March 1990): 311–30. http://dx.doi.org/10.1016/0168-1923(90)90004-p.
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Karabekova, D. Zh. "MAIN CHARACTERISTICS OF THE HEAT FLOW METER." Eurasian Physical Technical Journal 19, no. 2 (40) (June 15, 2022): 71–74. http://dx.doi.org/10.31489/2022no2/71-74.
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The problems and prospects of application of non-destructive testing methods for technical diagnostics of the thermal networks state and various technological objects are discussed. The recording of the temperature state of thermal processes by using a flow meter is due to its sensitivity to the change of thermophysical characteristics and the ability to control without the use of an external energy source, etc. The description of the developed device to measuring of the heat flow using of a thermoelectric heat flow converter of a special design is shown. A distinctive feature of the device is the heating element that installed on an insulating layer serving as a support surface. Calibration of the device is proposed to be carried out by replacing the heat flow from the investigated object with the heat flow released in the heating element when an electric current passes through it. The developed device can register the changes in the heat flux density in the range of (25-100) W/m2, which allows it possible to detect the smallest thermal insulation defects.
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Taler, Jan, Dawid Taler, Tomasz Sobota, and Piotr Dzierwa. "New technique of the local heat flux measurement in combustion chambers of steam boilers." Archives of Thermodynamics 32, no. 3 (December 1, 2011): 103–16. http://dx.doi.org/10.2478/v10173-011-0016-2.
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New technique of the local heat flux measurement in combustion chambers of steam boilers A new method for measurement of local heat flux to water-walls of steam boilers was developed. A flux meter tube was made from an eccentric tube of short length to which two longitudinal fins were attached. These two fins prevent the boiler setting from heating by a thermal radiation from the combustion chamber. The fins are not welded to the adjacent water-wall tubes, so that the temperature distribution in the heat flux meter is not influenced by neighbouring water-wall tubes. The thickness of the heat flux tube wall is larger on the fireside to obtain a greater distance between the thermocouples located inside the wall which increases the accuracy of heat flux determination. Based on the temperature measurements at selected points inside the heat flux meter, the heat flux absorbed by the water-wall, heat transfer coefficient on the inner tube surface and temperature of the water-steam mixture was determined.
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Xizhong, Zhang, Dai Zizhu, and Zhou Genhong. "Application of the heat flux meter in physiological studies." Journal of Thermal Biology 18, no. 5-6 (December 1993): 473–76. http://dx.doi.org/10.1016/0306-4565(93)90079-9.
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Filtz, J. R., T. Valin, J. Hameury, and J. Dubard. "New Vacuum Blackbody Cavity for Heat Flux Meter Calibration." International Journal of Thermophysics 30, no. 1 (June 18, 2008): 236–48. http://dx.doi.org/10.1007/s10765-008-0452-7.
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Gabriel Poloniecki, José, Antoine Vianou, and Emmanouil Mathioulakis. "Steady-state analysis of the zero-balance heat-flux meter." Sensors and Actuators A: Physical 49, no. 1-2 (June 1995): 29–35. http://dx.doi.org/10.1016/0924-4247(95)01009-p.
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Ren, Miaomiao, Jianjun Zhi, Zhengjie Fan, Ruizhi Wang, Yanli Chen, and Jian Yang. "Influence of Ladle Exchange on Inclusions in Transition Slabs of Continuous Casting for Automotive Exposed Panel Steel." Metals 13, no. 2 (February 15, 2023): 404. http://dx.doi.org/10.3390/met13020404.
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In the present work, inclusion analyses were carried out for inclusions in the tundish samples and in the 28 m transition slabs produced during the ladle exchange of heats A and B. At the beginning of heat B steel casting, the 12th meter of the casting slabs was in the position of the mold meniscus. The number of densities of the inclusions containing TiN and the inclusions containing Al2O3+TiN increased significantly from the 12th meter to the 22nd meter, while the number densities of the inclusions containing Al2O3 markedly increased from the 13th meter to the 20th meter. Therefore, the length of the transition slabs whose cleanliness was seriously reduced was about 10 m starting from the beginning of heat B steel casting. It was deduced that the contamination of the transition slabs could be caused by the liquid steel exposure in the tundish, the inflow of ladle filling sand of the next heat, or the entrainment of the tundish flux due to the fluctuation of the tundish liquid level at the beginning of heat B steel casting.
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Gumbarević, Sanjin, Bojan Milovanović, Mergim Gaši, and Marina Bagarić. "Application of Multilayer Perceptron Method on Heat Flow Meter Results for Reducing the Measurement Time." Engineering Proceedings 2, no. 1 (November 14, 2020): 29. http://dx.doi.org/10.3390/ecsa-7-08272.
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To reduce the impact on climate change, many countries have developed strategies for the building sector with a goal to reduce the energy demands and carbon emission of buildings. As most buildings that exist today will very likely exist in foreseeable future, many buildings will need to undergo major renovations. One of the most important parameters in determining the transmission heat losses through the building envelope is the U-value, i.e., thermal transmittance, and it is simply the rate of heat transfer per unit temperature. Since the U-value is one of the most important parameters regarding building energy performance, envelope elements that do not perform well in terms of transmission heat losses must undergo a renovation processes. The in-situ U-value of building elements is usually determined by the Heat Flux Method (HFM). One of the issues of current application of the HFM is the measurement duration. This paper explores the possibilities of reducing the measurement time by predicting the heat flux rate using a multilayer perceptron (MLP), a class of artificial neural network. The MLP uses two input layers that are the interior and exterior air temperatures, and the output layer that is the predicted heat flux rate. The predicted value is trained by comparing the predicted heat flux rates with the measured values, and by rearranging the neural network parameters (weights and biases) in corresponding neurons by minimizing the mean squared error defined for trained values (measured versus predicted heat flux rates). The use of MLP shows promising results for predicting the heat flux rates for the analyzed cases (4 days HFM results) when the training is performed on 2/3 or 1/2 of the overall measurement time. The application of the MLP could be in reducing the in-situ measurement time when determining heat losses through building elements in shorter time periods.
Dissertations / Theses on the topic "Heat Flux Meter"
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Gustavsson, Christian. "The Plate thermometer heat flux meter : An accuracy and calibration study." Thesis, Luleå tekniska universitet, Byggkonstruktion och brand, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-64157.
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Walters, Keith Ian. "The development of a heat flux meter for use in the measurement and control of combustion processes." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/848542/.
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The development and calibration of both a plane-headed (hemi-spherical view), and a spherical-type heat flux meter has been undertaken in this work. These instruments have been shown to be capable of producing a signal which is directly proportional to the incident radiant heat flux. Both radiant heat flux meters developed in this work, make use of a radial disc, conductivity type sensing element, where the incident radiant energy is distributed radially via the disc to a cooled metal block. The metal block heat sink is located at the end of a water-cooled arm to enable insertion into high temperature environments. Transient response analysis of the plane-headed heat flux meter yields a time constant of 10. 6 seconds. A perturbation analysis of the spherical heat flux meter concluded that the response time is a function of the radiation heat transfer coefficient existing between the probe and its environment. A finite difference analysis has been carried out on the radial disc assembly in order to investigate the temperature distribution under steady state conditions. It has been concluded that the mode of attachment of the radial disc assembly onto the cooling water probe, can have a modifying effect on the magnitude of the heat meter signal. However, this effect does not introduce non-linearity into the steady state signal response. For the finite difference analysis, an empirical correlation has been derived describing the convective heat transfer at a plane surface with the flow of cooling water perpendicular to the surface. The correlation applies for annular flow, and is given as: Nu = 1. 045 Re0. 4 Pr1/3 Testing of the spherical heat flow meter has been carried out in a 440kW gas-fired furnace. It has been concluded from these trials that: (i) a peak signal output is obtained for an equivalence ratio, o of between 1. 15 and 1. 32, in the range of firing rates 118kW to 142kW, where o is defined as. (ii) the ceramic shield, which forms an integral part of the heat meter, did not develop cracks or physical defects during the trials, (iii) the peak signal from the heat meter closely follows the peak heat gain by the furnace cooling water load rather than the optimum combustion conditions, as indicated by the flue gas composition. A steady state mathematical model of the gas-fired furnace is presented here, and is compared with the results obtained from the furnace runs. This is the first stage in the development of an unsteady state furnace model for use as an aid in the testing of furnace control systems.
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Alshawaf, Hussain M. J. A. A. M. A. "A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/101528.
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This work presents the development of a novel and non-invasive method that measures fluid flow rate and temperature in pipes. While current non-invasive flow meters are able to measure pipe flow rate, they cannot simultaneously measure the internal temperature of the fluid flow, which limits their widespread application. Moreover, devices that are able to determine flow temperature are primarily intrusive and require constant maintenance, which can shut down operation, resulting in downtime and economic loss. Consequently, non-invasive flow rate and temperature measurement systems are becoming increasingly attractive for a variety of operations, including for use in leak detection, energy metering, energy optimization, and oil and gas production, to name a few. In this work, a new solution method and parameter estimation scheme are developed and deployed to non-invasively determine fluid flow rate and temperature in a pipe. This new method is utilized in conjunction with a sensor-based apparatus--"namely, the Combined Heat Flux and Temperature Sensor (CHFT+), which employs simultaneous heat flux and temperature measurements for non-invasive thermal interrogation (NITI). In this work, the CHFT+ sensor embodiment is referred to as the British Thermal Unit (BTU) Meter. The fluid's flow rate and temperature are determined by estimating the fluid's convection heat transfer coefficient and the sensor-pipe thermal contact resistance. The new solution method and parameter estimation scheme were validated using both simulated and experimental data. The experimental data was validated for accuracy using a commercially available FR1118P10 Inline Flowmeter by Sotera Systems (Fort Wayne, IN) and a ThermaGate sensor by ThermaSENSE Corp. (Roanoke, VA). This study's experimental results displayed excellent agreement with values estimated from the aforementioned methods. Once tested in conjunction with the non-invasive BTU Meter, the proposed solution and parameter estimation scheme displayed an excellent level of validity and reliability in the results. Given the proposed BTU Meter's non-invasive design and experimental results, the developed solution and parameter estimation scheme shows promise for use in a variety of different residential, commercial, and industrial applications.MS
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Genc, Gence. "Serpentinization-assisted deformation processes and characterization of hydrothermal fluxes at mid-ocean ridges." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43725.
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Seafloor hydrothermal systems play a key role in Earth fs energy and geochemical budgets. They also support the existence and development of complex chemosynthetic biological ecosystems that use the mineral-laden fluids as a source of energy and nutrients. This dissertation focuses on two inter-related topics: (1) heat output and geochemical fluxes at mid-ocean ridges, and (2) structural deformation of oceanic lithosphere related to subsurface serpentinization in submarine settings.
The determination of heat output is important for several reasons. It provides important constraints on the physics of seafloor hydrothermal processes, on the nature of the heat sources at mid-ocean ridges, and on nutrient transport to biological ecosystems. Despite its importance, measurements of hydrothermal heat outputs are still scarce and cover less than 5% of active hydrothermal vent sites. In this work, we report development of two new devices designed to measure fluid flow velocities from the submersible at temperatures of up to 450 C and depths 5,000 m. By using these instruments on 24 Alvin dives, new measurements of hydrothermal heat output have been conducted at the Juan de Fuca Ridge, including first measurements from the High Rise and Mothra hydrothermal fields. The collected data suggest that the high-temperature heat output at the Main Endeavour Field (MEF) may be declining since the 1999 eruption. The flow measurement results, coupled with in-situ geochemical measurements, yielded the first estimates of geochemical fluxes of volatile compounds at MEF and Mothra. Our findings indicate that geochemical flux from diffuse flows may constitute approximately half of the net geochemical flux from Juan de Fuca Ridge.
It has recently been recognized that serpentinization of mantle peridotites, due to its exothermic nature, may be a mechanism contributing to the heat output at mid-ocean ridges. The tectonic response of the crust to serpentinization of extensively distributed peridotites at mid-ocean ridges and subduction zones could provide a means of characterizing serpentinized regions in the oceanic lithosphere. These regions are often associated with surface topographic anomalies that may result from the volume expansion caused by the serpentinization reactions. Although there is a clear correlation between tectonics and serpentinization, the link is complex and still not understood. In this dissertation, we calculated the transformation strain and surface uplift associated with subsurface serpentinization of variously shaped ultramafic inclusions. Application of the results to explain the anomalous topographic salient at the TAG hydrothermal field (Mid-Atlantic Ridge) suggests that this feature may result from a serpentinized body beneath the footwall of a detachment fault. Because the depth of the potential serpentinized region appears to be more than 1.5 times the size of the inclusion, the uplift profile is relatively insensitive to the exact location or shape of the serpentinized domain. The rate of exothermic heat release needed to produce the serpentinized volume may contribute to the ongoing diffuse flow. Application of the results to an uplift feature associated with the Kyushu ]Palau subduction zone in the western Pacific, shows that approximately 3% transformational strain in an inclined serpentinized region of the mantle wedge near the subducted Kyushu ]Palau Ridge may result in the observed uplift on the Miyazaki Plain. Using the uplift data may help to constrain the level of the subsurface serpentinization.
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Alanazi, Mohammed Awwad. "Non-invasive Method to Measure Energy Flow Rate in a Pipe." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/103179.
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Current methods for measuring energy flow rate in a pipe use a variety of invasive sensors, including temperature sensors, turbine flow meters, and vortex shedding devices. These systems are costly to buy and install. A new approach that uses non-invasive sensors that are easy to install and less expensive has been developed. A thermal interrogation method using heat flux and temperature measurements is used. A transient thermal model, lumped capacitance method LCM, before and during activation of an external heater provides estimates of the fluid heat transfer coefficient h and fluid temperature. The major components of the system are a thin-foil thermocouple, a heat flux sensor (PHFS), and a heater. To minimize the thermal contact resistance R" between the thermocouple thickness and the pipe surface, two thermocouples, welded and parallel, were tested together in the same set-up. Values of heat transfer coefficient h, thermal contact resistance R", time constant �[BULLET], and the water temperature �[BULLET][BULLET], were determined by using a parameter estimation code which depends on the minimum root mean square RMS error between the analytical and experimental sensor temperature values. The time for processing data to get the parameter estimation values is from three to four minutes. The experiments were done over a range of flow rates (1.5 gallon/minute to 14.5 gallon/minute). A correlation between the heat transfer coefficient h and the flow rate Q was done for both the parallel and the welded thermocouples. Overall, the parallel thermocouple is better than the welded thermocouple. The parallel thermocouple gives small average thermal contact resistance average R"=0.00001 (m2.�[BULLET][BULLET]/W), and consistence values of water temperature and heat transfer coefficient h, with good repeatability and sensitivity. Consequently, a non-invasive energy flow rate meter or (BTU) meter can be used to estimate the flow rate and the fluid temperature in real life.MS
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LORENZATI, ALICE. "Super Insulating Materials for energy efficient buildings: thermal performance and experimental uncertainty." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2711530.
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In a global energy-saving policy, Super Insulating Materials (SIMs) represent an effective solution, especially in a world almost saturated with old buildings for which energy refurbishments are needed. Given their extremely low thermal conductivity, they allow reaching an excellent insulation level, with reduced thicknesses. Anyway, they are recent materials or at least recent insulation solutions for the building sector. And as all the new technologies, they bring with them some critical issues to be solved. For example, what is the accuracy of their available thermal conductivity, what are the criteria for their optimal laboratory characterisation, what are their actual thermal performances in situ and how long is their durability and what is their practical convenience still remain open questions.
The aim of this research was to provide an answer to these questions, although sometimes in a preliminary way.
Therefore, the thermal properties of SIMs (and in particular of the Vacuum Insulation Panels, since, between the SIMs they are the most performing and the most critical solution) were explored at different levels, from the material/panel scale to the building scale.
SIMs are actually laboratory tested using traditional experimental apparatuses, such as the Heat Flow Meter (HFM) and the Guarded Hot Plate (GHP), and in accordance with as traditional standard, developed for the most common insulating material. Indeed, at the first stage of this research, the applicability of the current methodologies was extensively verified, with an in-depth analysis of the obtainable measurement uncertainties. The uncertainty assessment was performed in three different ways, to analyse the various scenarios that may occur: a theoretical standard based uncertainty evaluation, and both the Type A and Type B experimental uncertainty assessment.
Once defined the best criteria for a proper evaluation of the SIMs thermal properties, they were experimentally characterised, considering the different parameters which could have some effects on their thermal behaviour (different thicknesses, average testing temperature, temperature difference, ageing conditions and so on).
In practical applications of the VIPs, they must be assembled one to each other: innovatively, both the HFM and GHP apparatuses were also used for the evaluation of the linear thermal transmittance of the thermal bridges that occur in case of VIPs assemblies. The investigation performed at the material/panel level were then repeated at the component scale, to evaluate the variability and the measurement uncertainty of the linear thermal transmittance.
The so defined thermal performances represented a reliable pool of input data for the dynamic hygrothermal simulations at the building scale. The goals were the evaluation of the energy efficiency of building insulated with SIMs and the prediction of the durability of these materials (considering different severities of the building envelope component boundary conditions).
The outputs of the numerical simulations were then coupled with an economic analysis, to evaluate the convenience of VIP insulation, in terms of discounted pay-back period.
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Phillips, HE. "Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia." Thesis, 2000. https://eprints.utas.edu.au/814/1/front_thesis.pdf.
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This thesis describes the variability and mean flow of the Subantarctic Front
(SAF) south of Australia using time series measurements of velocity and
temperature from 1993 to 1995, and six hydrographic transects along WOCE
line SR3 from Tasmania to Antarctica over the period 1991 to 1996. The SAF
is the strongest jet of the Antarctic Circumpolar Current (ACC) south of
Australia. The time series of velocity and temperature are only the third such
dataset collected in the ACC and provide insight into the dynamics of this
massive current and into the heat and momentum balances of the Southern
Ocean.
The SAF was found to be an energetic, meandering jet with vertically coherent
fluctuations. These fluctuations varied on a timescale of 20 days, and had a
typical amplitude of 30 cm/s at 1150 dbar. The analysis used a coordinate
frame that rotated daily to be in alignment with the direction of flow. This
allowed the mesoscale variability of the SAF to be isolated from variability due
to meandering of the front and proved very successful for examining eddy
fluxes. Vertically averaged cross-stream eddy heat flux was 11.3 kW/m^2
poleward and was significantly different from zero at the 95% confidence level
for fluctuations with periods between 2 and 90 days. Zonally integrated, this
eddy heat flux (=0.9x10^15 W) is more than large enough to balance the heat
lost south of the Polar Front and is as large as cross-SAF fluxes found in Drake
Passage. Cross-stream eddy momentum fluxes were small and not significantly
different from zero but were tending to decelerate the mean flow. A relationship
between vertical motion and meander phase identified in the Gulf Stream was
found to hold for the SAF. Eddy kinetic energy levels were similar to those in
Drake Passage and southeast of New Zealand. Eddy potential energy was up to
an order of magnitude larger than at the other ACC sites, most likely because
meandering of the front is more common south of Australia. Baroclinic
conversion was found to be the dominant mechanism by which eddies grow
south of Australia. The typical time for the growth of an eddy is estimated to
be 30 days, approximately half that in Drake Passage. This is consistent with
observations from satellite altimetry which indicate that eddy energy is growing
rapidly downstream of the Australian measurement site, while the eddy field in
Drake Passage is mature.
Mean cross-stream profiles of absolute and baroclinic velocity in the SAF at five
current meter levels have been obtained from two streamwise profiling
techniques using specific volume anomaly at 780 dbar as the cross-stream
coordinate. One of the techniques, using hydrographic data to estimate the
baroclinic velocity profile, is presented for the first time. The mean SAF
velocity profile is composed of one central peak, reaching 52 and 34 cm/s at
420 dbar, absolute and baroclinic respectively, and several smaller peaks. The
SAF flow is coherent at all levels, reaches the sea floor, and is at least 220 km
wide. The cross-stream structure of baroclinic and absolute transport of the
SAF has been characterized for the first time. The integrated mean transport is
at least 116+/-10 x 10^6 m^3/s, of which approximately 14% is barotropic. The
linear conditions for baroclinic and barotropic instability are satisfied at the
array, consistent with the eddy growth rates calculated.
Book chapters on the topic "Heat Flux Meter"
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"heat flux meter." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 669. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_80550.
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Katsura, Takao. "Transparent Vacuum Insulation Panels." In Advances and Technologies in Building Construction and Structural Analysis. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.92422.
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New, low-cost transparent vacuum insulation panels (TVIPs) using structured cores for the windows of existing buildings are proposed. The TVIP is produced by inserting the structured core, the low-emissivity film, and the adsorbent into the transparent gas barrier envelopes. In this chapter, the authors introduce the outlines, the design and thermal analysis method, the performance evaluation (test) method. Firstly, five spacers, namely peek, modified peek, mesh, silica aerogel, and frame, are selected as the structured core. The effective thermal conductivity of TVIPs with five different spacers is evaluated at different pressure levels by applying numerical calculation. The result indicated that TVIPs with frame and mesh spacers accomplish better insulation performance, with a center-of-panel apparent thermal conductivity of 7.0 × 10−3 W/m K at a pressure of 1 Pa. The apparent thermal conductivity is the same as the value obtained by the simultaneous evacuation thermal conductivity measurement applying the heat flux meter method. Furthermore, using a frame-type TVIP with a total thickness of 3 mm attached to an existing window as a curtain decreases the space heat loss by approximately 69.5%, whereas the light transparency decreases to 75%.
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Graziani, Anthony, Karina Meerpoel-Petri, Virginie Tihay-Felicelli, Paul-Antoine Santoni, Frédéric Morandini, Yolanda Perez-Ramirez, Antoine Pieri, and William Mell. "Numerical prediction of the thermal stress induced by the burning of an ornamental vegetation at WUI." In Advances in Forest Fire Research 2022, 733–38. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_112.
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Over the last decades, urban expansion and global warming have increased the occurrence of wildland fires propagating at the vicinity of buildings at WUI. In this scenario, ornamental vegetation has been identified as a vector of fire propagation close to habitations, which can significantly increase the risk of damage [1]. In such context, it is necessary to quantify the thermal stress generated by an ornamental plant over a building to predict the vulnerability of construction materials. To this end, numerical simulation is a good candidate to easily multiply burning cases at field scale and explore the effects. The present study focuses on the numerical prediction of the thermal stress induced by the burning of an ornamental vegetation over targets facing the fire. The study involves a numerical modelling of the burning of rockrose hedges at field scale using the physics based code WFDS. The solver is based on a large eddy simulation approach for fluid dynamics and energy transfer through the fluid phase. A three steps thermal degradation model (dehydration, pyrolysis, char oxidation) with Arrhenius laws [2] is used for the fuel. The raised vegetation is represented with a Fuel Element approach which models the solid fuel as a set of static Lagrangian particles of different sizes and distributed within the volume to reproduce the arrangement of the shrub. The accuracy of WFDS to reproduce the combustion of plants has already been demonstrated at laboratory scales [2-6] but studies at field scale involving raised vegetation are few. Numerical results are compared to experimental measurements recorded during a set of experiments conducted at field scale, which involves the burning of reconstructed rockrose hedges of 6m length, 1m width and two heights (1m and 2m). The geometry mimics the typical shape of ornamental hedges that can be found to separate buildings in south of France. Visible cameras are distributed around the setup to capture the geometry of the flame front. Four couples of heat flux meters are positioned at 3m in front of the centreline and side of the hedge, which represents the theoretical position of the wall of a building according to the current fire safety regulation in France. Comparison between numerical model and experimental results shows good agreement for the local measurement of the heat stress at the location of the targets. Total and radiant heat fluxes fit with experimental data during the fire growth and the fully developed phases, which represent the period where the thermal stress is the highest. Peaks of total and radiant heat flux are the same order value but can be overestimated depending of the location of the sensors due to the wind dynamics that is not fully implementable in WFDS. Results show that the accuracy of the numerical model is enough to predict the thermal stress received by targets during the fully developed fire at field scale and could be used to numerically determine the vulnerability of material buildings in different scenarios.
Conference papers on the topic "Heat Flux Meter"
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Brajuskovic, Branislav, and Naim Hamdia Afgan. ""CLEAN" TYPE HEAT FLUX METER." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.2950.
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Martucci, Adolfo, Fabrizio De Gregorio, Marilena Musto, Orsola Petrella, Luigi Marciano, Giuseppe Rotondo, and Eliana Gaudino. "Innovative calibration methodology for gardon gauge heat flux meter." In 2020 IEEE 7th International Workshop on Metrology for AeroSpace (MetroAeroSpace). IEEE, 2020. http://dx.doi.org/10.1109/metroaerospace48742.2020.9160133.
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Sheng, Chunchen, Peng Hu, and Xiaofang Cheng. "Feasibility analysis on radiant transient heat flux meter calibration system." In 2016 International Conference on Engineering and Technology Innovations. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iceti-16.2016.28.
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Brown, Alexander L., and Thomas K. Blanchat. "A Validation Quality Heat Flux Dataset for Large Pool Fires." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47249.
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A series of experiments has been performed in the Sandia National Laboratories FLAME facility with a 2-meter diameter JP-8 fuel pool fire. Sandia heat flux gages were employed to measure the incident flux at 8 locations outside the flame. Experiments were repeated to generate sufficient data for accurate confidence interval analysis. Additional sources of error are quantified and presented together with the data. The goal of this paper is to present these results in a way that is useful for validation of computer models that are capable of predicting heat flux from large fires. We anticipate using these data for comparison to validate models within the Advanced Simulation and Computing (ASC, formerly ASCI) codes FUEGO and SYRINX that predict fire dynamics and radiative transport through participating media. We present preliminary comparisons between existing models and experimental results.
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Kivisalu, Michael, Amitabh Narain, Patcharapol Gorgitrattanagul, and Ranjeeth Naik. "Innovative Realizations of High Heat-Flux Boiling and Condensing Flows for Milli-Meter and Micro-Meter Scale Applications." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37319.
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For shear driven mm-scale flows, the traditional boiler and condenser operations pose serious problems of degraded performance (low heat-flux values, high pressure drops, and device-and-system level instabilities). The innovative devices are introduced for functionality and high heat load capabilities needed for shear dominated electronic cooling situations that arise in milli-meter scale operations, certain gravity-insensitive avionics-cooling and zero-gravity applications.
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Tao, Jiaqi, Xing Jiang, Zhenqin Xiong, Hangyu Wu, and Hanyang Gu. "Analysis on Heat Transfer of PRHR Heat Exchanger in Tank." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67187.
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The heat transfer performance of a small scaled passive residual heat removal (PRHR) heat exchanger is investigated by experiment. It is consisted of 42 C-shaped tubes, which is immerged in a 6-meter high water tank. The average heat flux is obtained under broad range of the working pressure and the mass flow rate of water inside the tubes by the tests. Furthermore, the distribution of the heat flux along the tube is analyzed with the assistance of empirical correlations. The heat transfer rate of the tubes predicted agrees well with the measured value, with a discrepancy less than 5%. These results are helpful in the design of PRHR heat exchanger in nuclear reactor.
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Hartenstine, John R., Richard W. Bonner, Jared R. Montgomery, and Tadej Semenic. "Loop Thermosyphon Design for Cooling of Large Area, High Heat Flux Sources." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33993.
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Two-phase flow loop technologies capable of acquiring high heat fluxes (>1kW/cm2) from large area heat sources (10cm2) are being considered for the next generation naval thermal requirements. A loop thermosyphon device (∼1 meter tall) was fabricated and tested that included several copper porous wick structures in cylindrical evaporators. The first two were standard annular monoporous and biporous wick designs. The third wick consists of an annular evaporator wick and an integral secondary slab wick for improved liquid transport. In this configuration a circular array of cylindrical vapor vents are formed integral to the primary and secondary transport wick composite. Critical heat fluxes using these wick structures were measured between 240W/cm2 and 465W/cm2 over a 10cm2 area with water as the working fluid at 70°C saturation temperature. A thermosyphon model capable of predicting flow rate at various operating conditions based on a separated flow model is presented.
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Qu, Chuang, and Edward C. Kinzel. "Thermal Radiation From Microsphere Photolithography Patterned Metasurfaces." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5098.
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Frequency-Selective Surfaces (FSS) type metasurfaces consist of periodic arrays of antenna elements. They can be scaled from microwave frequencies to the infrared wavelengths where they allow the scattering response to be engineered. This includes the spectral absorptance/emittance. At IR wavelengths, the features sizes of the metasurface are sub-micron which poses manufacturing issues for the meter squared scales required for most heat transfer applications. In this paper, we investigate the use of Microsphere Photolithography for creating spectrally selective metasurfaces. This approach uses a self-assembled array of microspheres as a lens array to focus a lattice of photonic jets into photoresist. These can be used with lift-off to create metal-insulator-metal (MIM) or even five-layer of resonant structures. We study the design constraints and synthesize a broadband emitter in the mid-infrared. The spectral absorptance is measured experimentally using FTIR. The structures are then tested at moderate temperatures to demonstrate the ability to affect surface temperature/heat flux in practical applications.
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Hoang, Triem T., Tamara A. O’Connell, Jentung Ku, C. Dan Butler, and Theodore D. Swanson. "Miniature Loop Heat Pipes for Electronic Cooling." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35245.
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Thermal management of modern electronics has become a problem of significant interest due to the demand for power and reduction in packaging size. Requirements of next-generation microprocessors in terms of power dissipation and heat flux will certainly outgrow the capability of today’s thermal control technology. LHPs, like conventional heat pipes, are capillary pumped heat transport devices. They contain no mechanical moving part to wear out or require electrical power to operate. But unlike heat pipes, LHPs possess much higher heat transport capabilities enabling them to transport large amounts of heat over long distances in small flexible lines for heat rejection. In fact, a miniature ammonia LHP developed for a NASA space program is capable of transporting 60W over a distance of 1 meter in 1/16”O.D. stainless steel tubing. Therefore, miniature LHPs using water as the working fluid are excellent candidates to replace heat pipes as heat transports in electronic cooling systems. However, a number of operational issues regarding system performance, cost, and integration/packaging must be resolved before water LHPs can become a viable option for commercial electronics.
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Zeng, M., G. Wang, Y. C. Ren, H. Ozoe, and Q. W. Wang. "Experimental Study of Transient Natural Convection in an Inclined Porous Enclosure With Time-Periodically-Varying Wall Temperature." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65085.
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The transient natural convection in an inclined enclosure filled with porous media is studied experimentally and numerically for the time-periodically-varying wall temperature on one side wall and constant average temperature on the opposing side wall. This system has no temperature difference between the opposing two side walls in time-averaged sense. The porous media with three kinds of porosity consist of water and three kinds of glass ball with different diameter. The temperature and heat flux across the two above-mentioned walls are measured by a heat flux meter. The effects of inclined angles and porosity of the enclosure on heat transfer characteristics have also been studied. The experimental results show that, with the upper wall temperature oscillating, the heat flux across the enclosure is also periodically varied with time. However, the net heat flux is always from the lower wall to the upper wall and reaches maximum at a certain inclined angle. Numerical computations are also conducted and numerical results are qualitatively assured by the experimental measurements.
Reports on the topic "Heat Flux Meter"
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Childs, Kenneth W., Kaushik Biswas, and Jerald Allen Atchley. Exterior Insulation Systems Containing Vacuum Insulation Panels Tested Using a Heat Flux Meter Apparatus. Office of Scientific and Technical Information (OSTI), November 2012. http://dx.doi.org/10.2172/1093048.
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