scholarly journals An investigation into sky temperature estimation, its variation, and significance in heat transfer calculations of solar cookers

2019 ◽  
Vol 48 (5) ◽  
pp. 1830-1856 ◽  
Author(s):  
Ashish Karn ◽  
Venkateshwarlu Chintala ◽  
Suresh Kumar
Keyword(s):  
Heat Transfer ◽  
Temperature Estimation ◽  
Sky Temperature

Impact of Layered Soil on Foundation Heat Transfer for Slab-On Grade Floors

2009 ◽  
Author(s):  
Nizar Khaled ◽  
Moncef Krarti
Keyword(s):  
Heat Transfer ◽  
Temperature Estimation ◽  
Soil Medium ◽  
Coupled Heat Transfer ◽  
Building Foundation ◽  
Soil Thermal Properties ◽  
Homogeneous Soil ◽  
Periodic Heat ◽  
The Impact ◽  
Zone Temperature

This paper presents an analytical solution for the steady-periodic heat transfer for a typical slab-on-grade floor building foundation beneath non-homogeneous soil medium. The impact of the above-grade walls on ground-coupled heat transfer is accounted for in the presented solution. The Inter-zone Temperature Estimation Profile (ITPE) technique is utilized to obtain the 3-D solutions to determine soil temperature distributions and to estimate foundation heat loss/gain from slab-on-grade floors. The impact of the non-homogeneous soil properties on the transient foundation heat transfer is investigated for various slab configurations and soil thermal properties.

Engine Cycle-by-Cycle Cylinder Wall Temperature Observer-Based Estimation Using Cylinder Pressure Signals

2011 ◽  
Author(s):  
Fengjun Yan ◽  
Junmin Wang
Keyword(s):  
Heat Transfer ◽  
Wall Temperature ◽  
Disturbance Observer ◽  
Fuel Injection ◽  
Cold Start ◽  
Estimation Methods ◽  
Frequency Noise ◽  
Cylinder Wall ◽  
Cylinder Pressure ◽  
Temperature Estimation

Estimating cylinder wall temperature before start of fuel injection in a dynamic and cycle-by-cycle way is important for advanced combustion mode engine control, particularly during cold-start and transient operations. In this paper, two methods for cylinder wall temperature estimation, based on disturbance observer designs, are proposed. The heat transfer through cylinder wall is viewed as a disturbance in total heat release. With disturbance observers, this heat transfer can be estimated in finite time and thus to calculate the cylinder wall temperature. To handle the high frequency noise issues in cylinder pressure signals, a robust disturbance observer is proposed and compared with a typical design method. The effectiveness of such cylinder wall temperature estimation methods are demonstrated and compared with engine experimental data obtained during a cold-start process.

Development of Temperature Estimation Method for a Gas Turbine Transition Piece

2016 ◽  
Author(s):  
Mitsutoshi Okada ◽  
Toshihiko Takahashi ◽  
Susumu Yamada ◽  
Takayuki Ozeki ◽  
Tomoharu Fujii
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Gas Turbine ◽  
Estimation Method ◽  
Life Assessment ◽  
Estimation Methods ◽  
Test Time ◽  
Internal Cooling ◽  
Temperature Estimation ◽  
Transition Piece

Temperature estimation methods for a transition piece of a gas turbine are developed in terms of microstructural changes and computational fluid dynamics (CFD) for life assessment. Temperature is estimated to be low around the center of the component where thermal barrier coating (TBC) is deposited on the Ni-base superalloy and a combination of internal cooling and film cooling is also applied. Test specimens are prepared from the above area for a high-temperature heating test in air. The microstructure in the superalloy and TBC is investigated after the test. The thermally grown oxide (TGO) formed on the bondcoat surface increases with the square root of the test time, and on the basis of this relation, a temperature-estimation equation is obtained. The estimated temperature distribution is compared with a numerical heat transfer simulation by means of CFD. The geometry of the transition piece with internal cooling structure is acquired using an X-ray computerized radiography and a laser digitizer, and it is modeled for the numerical simulation. The heat conduction analysis is applied to the transition piece, and the convection and radiation heat transfer analyses are applied to the gas path and internal cooling flow. These analyses are conjugated to estimate the temperature distribution. The simulation result agrees well with the estimation using TGO thickness.

scholarly journals A Model of Sky Temperature Estimation at 1.42 GHz using University of Baghdad’s Radio Telescope

2021 ◽  
pp. 4537-4544
Author(s):  
Ahmed A. Hameed ◽  
Kamal M. Abood
Keyword(s):  
Radio Telescope ◽  
Temperature Model ◽  
Temperature Estimation ◽  
Sky Temperature

 The objective of this study is to select a suitable observing region at Baghdad location (44o 22' 48", 33o 16' 30") with low interference that may affect frequency of 1.42 GHz. Baghdad University Radio Telescope (BURT) is used in this study to determine a convenient region for observation in Baghdad sky. Different azimuths and elevations were chosen at different observations time. The results of this study showed that the best observations regions were located at azimuth (120o-160o) and (210o-260o). These regions included less sky temperature and estimated to be (42.8 to 163) K. The sky temperature model could be represented as a polynomial of third degree that could fit the behavior of the observation points.

scholarly journals Cookies Internal Temperature Estimation Using IHCP Methodology

2021 ◽  
Vol 7 (1) ◽  
pp. 1-14
Author(s):  
Macías Ávila Eduardo ◽  
Díaz Yaneth Aguilar
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Problem Solving ◽  
Transfer Problem ◽  
Internal Temperature ◽  
Temperature Estimation ◽  
Inverse Heat Transfer ◽  
Inverse Heat Transfer Problem ◽  
The Mathematical Model ◽  
Adjustment Of Parameters

This work constitutes a continuation of previous work on determining the internal temperature of foods by applying inverse heat transfer problem solving techniques. In this research, a mathematical model of heat transfer applied to foods is developed whose central part heat transfer can be described in Cartesian coordinates. This model uses techniques established in the previous work. The technique is based on the adjustment of parameters involved in heat transfer, minimizing the sum of squared errors between the measured temperatures and those calculated by the mathematical model. This paper discusses how the precision of this method would be affected with respect to the measurement time of the surface temperature and the delay time of the measurement.

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