Research on Temperature Distribution for Tubing Liquid with Hot Natural Gas Injected Annulus Using Gas Lift

2014 ◽  
Vol 496-500 ◽  
pp. 1084-1087
Author(s):  
Luo Wei ◽  
Rui Quan Liao ◽  
Yong Li ◽  
Jian Wu
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Natural Gas ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Prediction Methods ◽  
Fluid Temperature ◽  
Temperature Prediction ◽  
Conservation Of Energy ◽  
Gas Lift

In light of the difficulty including the complicacy of heat transfer process with hot natural gas injected in gas lift annulus, regular temperature prediction methods are commonly used to consider the tubing fluid temperature for the heat transfer from tubing to annulus, actually the tubing fluid will not be the external heat transfer but it will be heated by annulus when the gas temperature in annulus is higher than the tubing fluid temperature, as well as especially the prediction of tubing wellhead temperature in terms of fluid temperature distribution traits in annulus and tubing, regular temperature prediction methods manifest limitation due to their applicability. Based on the fairly comprehensive tubing fluid temperature distribution prediction model with consideration of Thomson effect and such factors as kinetic energy, annular convection heat transfer and phase change etc. developed by the predecessors, and according to the basic principle of conservation of energy and heat transfer, the actual heat transfer process with hot natural gas injected in gas lift annulus was considered as a plus in this paper. The models for actual heat transfer and tubing fluid modified temperature prediction were established and eventually, the models were verified via multiple field tests. The reliability, capable of satisfying the requirements of engineering precision, in terms of temperature distribution of model prediction was proved.

scholarly journals Modeling of the heat transfer process in an air heat pump fanless evaporator

2018 ◽  
Vol 240 ◽  
pp. 05012
Author(s):  
Piotr Kopeć ◽  
Beata Niezgoda-Żelasko
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Mixed Convection ◽  
Heat Pump ◽  
Transfer Process ◽  
Experimental Studies ◽  
Heat Transfer Process ◽  
Cfd Modeling ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

This paper analyses the mixed convection process in a fanless evaporator of an air heat pump. The text of the paper shows the authors’ experimental studies results of the temperature distribution and the local values of heat transfer coefficients on the outer surface of vertical tubes with longitudinal fins for the case of mixed convection and fins of a specific shape of their cross-section (prismatic, wavy fins). The experimental studies include the air velocities wa=2,3 m/s and the temperature differences between air and the refrigerant inside the heat exchanger tubes which is ΔT=24-40K. The results obtained were used for verification of CFD modeling of the heat transfer process for the discussed case of heat transfer and the geometry of the finned surface. The numerical analysis was performed for: the temperature distribution along the fin height, the tube perimeter and height, the distribution of local heat transfer coefficients on the finned tube perimeter and along its height. The simulated calculations were used to verify the method of determination of fin efficiency.

Mathematical Modeling of Heat Transfer through Clothing System

2011 ◽  
Vol 250-253 ◽  
pp. 3889-3892
Author(s):  
Yu Chai Sun ◽  
Zhong Hao Cheng
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Heat Conduction ◽  
Theoretical Prediction ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Conservation Of Energy ◽  
Mathematical Equations ◽  
Boltzmann Law ◽  
Theoretical Results

Based on fundamental principles of Fourier's law of heat conduction, Newton's law of cooling, Stefan-Boltzmann law and the law of conservation of energy, this paper gave out mathematical equations for description of the general heat transfer process through clothing system, and compares the theoretical results with experimental results. The result of the experiment is in accordance with the theoretical prediction.

Controlled Temperature Distribution and Heat Transfer Process in the Unidirectional Solidification of Aluminium Alloys

2012 ◽  
Vol 188 ◽  
pp. 314-317
Author(s):  
Florin Ştefănescu ◽  
Gigel Neagu ◽  
Alexandrina Mihai ◽  
Iuliana Stan
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Thermal Conditions ◽  
Solidification Process ◽  
Heat Transfer Process ◽  
Solidification Structure ◽  
Major Influence ◽  
Cast Material

Abstract. The paper presents some theoretical and experimental data regarding the directional solidification, revealing the main factors (especially those which are related to the heat transfer process) which have influence on the crystals size and morphology. The crystalline structure of alloys is determined by three important factors: chemical composition, thermal conditions, and characteristics of germination and growth from liquid of solid nuclei. The solidification structure can be influenced by acting on the mould properties or directly on the cast material, both of these actions being based upon the change of temperature distribution in the alloy-mould system. Experimental data demonstrated the major influence of the thermal regime on the crystallization-solidification process, on the transcrystallization zone and they pointed out the limits to direct the crystals formation (size and shape) by changing the cooling regime.

The effect of heat loss on the performance of a solar-driven heat engine

2009 ◽  
Vol 223 (7) ◽  
pp. 1615-1621
Author(s):  
O S Sogut ◽  
A Durmayaz
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Loss ◽  
Transfer Process ◽  
Rankine Cycle ◽  
Heat Transfer Process ◽  
Working Fluid ◽  
Fluid Temperature ◽  
Parabolic Trough ◽  
Thermal Reservoir

An optimal performance analysis of a parabolic-trough direct-steam-generation solar-driven Rankine cycle power plant at maximum power (MP) and under maximum power density (MPD) conditions is performed numerically to investigate the effects of heat loss from the heat source and working fluid. In this study, the ideal Rankine cycle of the solar-driven power plant is modified into an equivalent Carnot-like cycle with a finite-rate heat transfer. The main assumptions of this study include that: (a) the parabolic collector is the thermal reservoir at a high temperature, (b) the heat transfer process between the collector and the working fluid is through either radiation and convection simultaneously or radiation only, and (c) the heat transfer process from the working fluid to the low-temperature thermal reservoir is convection dominated. Comprehensive discussions on the effect of heat loss during the heat transfer process from the hot thermal reservoir to the working fluid in the parabolic-trough solar collector are provided. The major results of this study can be summarized as follows: (a) the working fluid temperature at the hot-side heat exchanger decreases remarkably whereas the working fluid temperature at the cold-side heat exchanger does not show any significant change with increasing heat loss, (b) the MP, MPD, and thermal efficiencies decrease with increasing heat loss, and (c) the effect of heat loss on the decrease of thermal efficiency increases when convection is the dominant heat transfer mode at the hot-side heat exchanger.

Study on Temperature Distribution of Plasma Surface Alloying Furnace

2008 ◽  
Vol 575-578 ◽  
pp. 633-638
Author(s):  
Zhong Hou Li ◽  
Sha Sha Liu ◽  
Zhi Yong Cheng
Keyword(s):  
Heat Transfer ◽  
Numerical Calculation ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Calculation Results ◽  
Heat Preservation ◽  
Plasma Surface Alloying

The objective of this research was to develop methods for improved the uniformity of temperature distribution within plasma surface alloying furnace by simulating the heat transfer process and numerical calculation. Results show that the structure of charging basket, hanging auxiliary cathode plates in both sides of charging basket and blackness of material influence strongly temperature distribution within the plasma surface alloying furnace. Discharge intensity of the center zone can be weakened through increasing the distance between backs both column blades in center of the furnace, which decreased the consumption of discharge power in center, depressed temperature of the center zone of the furnace. Intensity of discharge in fringe of the charging basket can be reinforced and that of discharge in center can be weakened when auxiliary cathode plates were hanged to outer flank of the charging basket, which increased boundary temperature of the system, at the same time the auxiliary cathode plate plays a heat preservation role. Decreasing the blackness of outside material of charging basket may decrease heat dissipating capacity of outside, decrease temperature difference of outside and center of the furnace and improve the uniform of temperature distribution in the furnace.

PARAMETRIC STUDIES OF CHARGING AND DISCHARGING IN ADSORBED NATURAL GAS VESSEL USING ACTIVATED CARBON

2010 ◽  
Vol 24 (13) ◽  
pp. 1421-1424 ◽  
Author(s):  
WAI SOONG LOH ◽  
KAZI AFZALUR RAHMAN ◽  
KIM CHOON NG ◽  
BIDYUT BARAN SAHA ◽  
ANUTOSH CHAKRABORTY
Keyword(s):  
Heat Transfer ◽  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Natural Gas ◽  
Transfer Process ◽  
Temperature Increase ◽  
Heat Transfer Process ◽  
Adsorbed Natural Gas ◽  
Parametric Studies

This paper presents the adsorption isotherm experiment of Methane and Maxsorb III activated carbon that was conducted and analyzed at temperatures from 5 to 55 °C and pressures up to 2.2 MPa in a volumetric apparatus. It is a complementary to the previous efforts by ways of analyzing the importance between charging and discharging rate, temperature increase and reduce of the bed, the heat transfer process, and the cylinder cooling and heating requirements during the charging and discharging of adsorbed natural gas.

scholarly journals Analysis of temperature distribution in the heating boiler equipped with afterburning chamber

2019 ◽  
Vol 128 ◽  
pp. 01009
Author(s):  
Wojciech Judt ◽  
Bartosz Ciupek ◽  
Rafał Urbaniak
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Solid Fuel ◽  
Heat Transfer Process ◽  
Heating Device ◽  
Afterburning Chamber ◽  
Vertical Tubes ◽  
Heating Boiler

Analysis of a heat transfer process for construction of solid fuel heating boiler equipped with additional afterburning chamber is presented. Analyzed construction of the heating device is intended for shouse heating and preparation of hot utility water. A heat exchanger in the analyzed boiler is composed of vertical tubes divided into three boiler draughts. Afterburning chamber connects main combusting chamber of the heating boiler with second and third boiler draught. The aim of this analysis is to identify the character of heat transfer through the heating boiler

scholarly journals Entropy Rates and Efficiency of Convecting-Radiating Fins

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1643
Author(s):  
Claudio Giorgi ◽  
Federico Zullo
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Numerical Results ◽  
Entropy Rate ◽  
Fluid Temperature ◽  
Standard Definition ◽  
Definition Of

We present a novel indicator for the effectiveness of longitudinal, convecting-radiating fins to dissipate heat. Starting from an analysis of the properties of the entropy rate of the steady state, we show how it is possible to assess the efficiency of such devices by looking at the amount of entropy produced in the heat transfer process. Our study concerns both purely convective fins and convection-radiant fins and takes advantage of explicit expressions for the distribution of heat along the fin. It is shown that, in a suitable limit, the standard definition of efficiency and the entropic definition coincide. The role of the fluid temperature is explicit in the new definition and in the purely convective case. An application to an aluminium fin is given. Analytical and numerical results are discussed.

Research on Effective Factors of Heat Transfer of Thin Heating Floor

2012 ◽  
Vol 446-449 ◽  
pp. 2920-2923
Author(s):  
Quan Ying Yan ◽  
Li Li Jin ◽  
Ran Zhou ◽  
Sui Lin Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Air Temperature ◽  
Transfer Process ◽  
Indoor Air ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Effective Factors ◽  
Average Temperature ◽  
Surface Temperature Distribution

In this paper, numerical simulations of heat transfer process in thin heating floor were done by ANSYS. The influence of tube spacing, the average temperature of hot water and indoor air temperature on surface temperature distribution of heating floor and heat density were analyzed. The results can provide reference and basis for optimization, application and promotion of the thin heating floor.

The Simulation and Analysis of Heat Transfer Process of Honeycomb Regenerator

2011 ◽  
Vol 130-134 ◽  
pp. 1810-1815 ◽  
Author(s):  
Ye Tian ◽  
Xun Liang Liu ◽  
Zhi Wen ◽  
Xiao Hong Feng ◽  
Zhi Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Rational Design ◽  
Distribution Curve ◽  
Mathematic Model ◽  
Heat Transfer Process ◽  
Structure Parameter ◽  
Regenerative Burner ◽  
Ceramic Honeycomb

On the basis of established mathematic model of regenerator heat transfer process, the process of heat transfer of ceramic honeycomb regenerator with the method of simulation is studied. The temperature distribution curve of regenerator and gas is obtained, the temperatures curve of regenerator and gas are closely related to time is investigated ,and the influence of operation and structure parameter to heat transfer of regenerator is discussed. All this work is to provide guides of rational design of single-ended regenerative burner.

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