Comparisons of Temperature and Heat Flux in Furnaces Controlled by Different Types of Temperature Sensors

2010 ◽  
pp. 44-44-19
Author(s):  
Mohamed A. Sultan
Keyword(s):  
Heat Flux ◽  
Temperature Sensors ◽  
Different Types

Thermal Studies of Specific Envelope Solutions for an Energy Efficient Building

2015 ◽  
Vol 660 ◽  
pp. 192-197
Author(s):  
Iosif Boros ◽  
Cristina Tanasa ◽  
Valeriu Stoian ◽  
Daniel Dan
Keyword(s):  
Heat Flux ◽  
Energy Efficient ◽  
Flux Distribution ◽  
Thermal Studies ◽  
Temperature Sensors ◽  
Building Envelope ◽  
Heat Flux Distribution ◽  
Different Types ◽  
Materials Used ◽  
Energy Efficient Building

This paper presents the design and monitoring scheme of an energy efficient high school building with emphasis on the analysis of constructive and geometric thermal bridges that can affect the overall energy consumption and thermal comfort. The ANTHERM software is used to accurately assess the specific details and determine isotherms, heat flux distribution and the Psi-values (Ψ value) of the sections where different types of materials connect. A monitoring system with temperature sensors installed in the layers of the building envelope elements has been designed in order to compare the obtained values with the real time thermal performances of the envelope elements. The study highlights the influence of the type and thickness of the insulation materials used in the specific constructive details on the overall thermal performance of buildings.

Estimating the Wall Heat Flux of Unsteady Conjugated Forced Convection Between Two Corotating Disks Using an Inverse Solution Scheme

2008 ◽  
Vol 130 (12) ◽  
Author(s):  
David T. W. Lin ◽  
Hung Yi Li ◽  
Wei Mon Yan
Keyword(s):  
Heat Flux ◽  
Forced Convection ◽  
Boundary Surface ◽  
Temperature Sensors ◽  
Inverse Solution ◽  
Wall Heat Flux ◽  
Unknown Boundary ◽  
Measured Temperature ◽  
Solution Scheme ◽  
Good Agreement

An inverse solution scheme based on the conjugate gradient method with the minimization of the object function is presented for estimating the unknown wall heat flux of conjugated forced convection flows between two corotating disks from temperature measurements acquired within the flow field. The validity of the proposed approach is demonstrated via the estimation of three time- and space-dependent heat flux profiles. A good agreement is observed between the estimated results and the exact solution in every case. In general, the accuracy of the estimated results is found to improve as the temperature sensors are moved closer to the unknown boundary surface and the error in the measured temperature data is reduced.

Fluid turbulence simulations of divertor heat load for ITER hybrid scenario using BOUT++

2021 ◽  
Author(s):  
Xueyun Wang ◽  
Xueqiao Xu ◽  
Philip B Snyder ◽  
Zeyu Li
Keyword(s):  
Heat Flux ◽  
Steady State ◽  
Energy Loss ◽  
Heat Load ◽  
Type I ◽  
Fluid Turbulence ◽  
Drift Model ◽  
Steady State Operation ◽  
Different Types ◽  
The One

Abstract The BOUT++ six-field turbulence code is used to simulate the ITER 11.5MA hybrid scenario and a brief comparison is made among ITER baseline, hybrid and steady-state operation (SSO) scenarios. Peeling-ballooning instabilities with different toroidal mode numbers dominate in different scenarios and consequently yield different types of ELMs. The energy loss fractions (ΔWped/Wped) caused by unmitigated ELMs in the baseline and hybrid scenarios are large (~2%) while the one in the SSO scenario is dramatically smaller (~1%), which are consistent with the features of type-I ELMs and grassy ELMs respectively. The intra ELM divertor heat flux width in the three scenarios given by the simulations is larger than the estimations for inter ELM phase based on Goldston’s heuristic drift model. The toroidal gap edge melting limit of tungsten monoblocks of divertor targets imposes constraints on ELM energy loss, giving that the ELM energy loss fraction should be smaller than 0.4%, 1.0%, and 1.2% for ITER baseline, hybrid and SSO scenarios, correspondingly. The simulation shows that only the SSO scenario with grassy ELMs may satisfy the constraint.

Forced-Convective Post-CHF Heat Transfer and Quenching

1982 ◽  
Vol 104 (1) ◽  
pp. 48-54 ◽  
Author(s):  
R. A. Nelson
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Homogeneous Nucleation ◽  
Nuclear Reactor ◽  
Reactor Safety ◽  
Fuel Rod ◽  
Different Types ◽  
Nuclear Reactor Safety ◽  
Transfer Problems ◽  
Prediction Capability

Mechanisms in the postcritical heat flux region that provide understanding and qualitative prediction capability for several current force-convective heat-transfer problems are discussed. In the area of nuclear reactor safety, the mechanisms are important in the prediction of fuel rod cooldown and quenches for the reflood phase, blowdown phase, and possibly some operational transients with dryout. Results using the mechanisms to investigate forced-convective quenching are presented. Data reduction of quenching experiments is discussed, and the way in which the quenching transient may affect the results of different types of quenching experiments is investigated. This investigation provides an explanation of how minimum wall superheats greater than the homogeneous nucleation temperature result, as well as how these may be either hydrodynamically or thermodynamically controlled.

scholarly journals Investigation of Fin Spacing for Heat Transfer Enhancement in Cross Flow Over Tubes Between Two Parallel Plates

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Ahmad Nurye Oumer ◽  
Amer Farhan Alias
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Parallel Plates ◽  
Transfer Enhancement ◽  
Tube Heat Exchanger ◽  
Finned Tube Heat Exchanger ◽  
Different Types ◽  
Fin Spacing

This research explains the investigation of fin spacing for heat transfer enhancement in the finned tube heat exchanger. The objective of this paper is to recommend the optimum fin spacing for heat transfer enhancement. Three different types of tube and spacing are identified through the simulation from Ansys software. The data between simulation using Ansys Fluent and published literature were being compared. Graph of total pressure, Nusselt number and total temperature have been plotted to make the comparison. Result obtained showed that were a bigger agreement between the simulation and published literature for both types of the tube which are circular and elliptic. From the analysis, there were considered two types of arrangement for the different types of tube. From that, the aligned arrangement is the best for heat transfer enhancement compared to the staggered. For the effect of spacing, there was three spacing which is 1.7 mm, 1.8 mm, and 2.0 mm spacing with velocity and the total heat flux is set to be constant (v =1.4 m/s; q = 500 W/m2). For the circular tube, it can be seen that the wider of the fin spacing gave the best heat transfer enhancement in the heat exchanger. Different from the circular which is 1.8 mm spacing is the best for heat transfer enhancement. Other types of tube are a flat surface which is comparing with the variations of Nu vs Re with different heat flux. Then, the result showed that as the Re is increased the Nu will also increase. In the other side, it is recommended for future work to do the real model dimension followed to import to the Ansys instead of assuming the model is symmetrical.

scholarly journals An External Circular Crack in an Infinite Solid Under Axisymmetric Heat Flux Loading in the Framework of Fractional Thermoelasticity

Entropy ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 70
Author(s):  
Yuriy Povstenko ◽  
Tamara Kyrylych ◽  
Bożena Woźna-Szcześniak ◽  
Renata Kawa ◽  
Andrzej Yatsko
Keyword(s):  
Heat Flux ◽  
Thermal Stresses ◽  
Time Derivative ◽  
Circular Crack ◽  
Constant Heat Flux ◽  
Circular Ring ◽  
Different Types ◽  
External Circular Crack ◽  
Fractional Heat Conduction ◽  
Real Solid

In a real solid there are different types of defects. During sudden cooling, near cracks, there can appear high thermal stresses. In this paper, the time-fractional heat conduction equation is studied in an infinite space with an external circular crack with the interior radius R in the case of axial symmetry. The surfaces of a crack are exposed to the constant heat flux loading in a circular ring R<r<ρ. The stress intensity factor is calculated as a function of the order of time-derivative, time, and the size of a circular ring and is presented graphically.

The effect of proton and gamma radiation on different types of temperature sensors

2009 ◽  
Author(s):  
Miguel Gonzalez-Guerrero ◽  
Maria T. Alvarez ◽  
Juan J. Jimenez ◽  
Jaime Sanchez-Paramo ◽  
Hector Guerrero
Keyword(s):  
Gamma Radiation ◽  
Temperature Sensors ◽  
Different Types
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