Simulation Study on the Wall Heat Transferring Characteristics for the Gas-Infrared Heated System

2011 ◽  
Vol 243-249 ◽  
pp. 4923-4928
Author(s):  
Ke Qin Gong ◽  
Hong Fang Jiang ◽  
Sheng Jie Guo ◽  
Da Ying Zhang
Keyword(s):  
Numerical Simulation ◽  
Thermal Equilibrium ◽  
Heating System ◽  
Wall Surface ◽  
Radiant Heating ◽  
Exterior Wall ◽  
Surface Temperature Distribution ◽  
Convection Heating ◽  
Heating Energy Consumption ◽  
Wall Surface Temperature

The theoretical analysis and numerical simulation for wall heat transferring process of the gas-infrared heated room is finished in this paper. The thermal equilibrium equation is established, and the heat loss is analyzed between radiant heating system and convection heating system. By means of numerical simulation, the exterior wall surface temperature distribution and the influences of wall blackness to the workspace air temperature as well as the heating energy consumption are studied.

Influence of Covering Layer on Surface Temperature of Floor Radiant Heating System

2012 ◽  
Vol 204-208 ◽  
pp. 4260-4263 ◽  
Author(s):  
Hai Qian Zhao ◽  
Zhong Hua Wang ◽  
Lan Shuang Zhang
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Heating System ◽  
Radiant Heating ◽  
Wooden Floor ◽  
Surface Temperature Distribution ◽  
Covering Layer ◽  
Floor Surface ◽  
Space Saving ◽  
Cover Material

Floor radiant heating system has many advantages, energy and space saving, for example. The radiant floor is the radiator of floor radiant heating system, and its thermal parameters influence surface temperature distribution and comfort. In this paper, mathematical model of heat exchange coil under floor was established, and boundary heat transfer conditions were given. Based on these, surface temperature of different covering layer was calculated. According to the results, using different covering layer, the floor surface temperature has a great difference. Using wooden floor as cover material, the floor surface temperature is more moderate and uniform.

Control System of Low Carbon and Energy-Saving Radiant Heating

2013 ◽  
Vol 385-386 ◽  
pp. 795-798
Author(s):  
Jin Hua Ding ◽  
Yu Jun Hu ◽  
De Quan Wang ◽  
Teng Gao ◽  
Ji Tian ◽  
...  
Keyword(s):  
Energy Saving ◽  
Control Algorithm ◽  
Heating System ◽  
Radiant Heating ◽  
Low Carbon ◽  
Radiation Heating ◽  
Large Space ◽  
Convection Heating ◽  
Control Principle ◽  
And Control

According to the characteristics of large space building's heating, the effect in energy saving and environmental protection is analyzed on Radiant heating and Convection heating. Then Radiant heating consists of burners, radiation pipe, reflection plate, vacuum blowers and exhausted pipe. Based on the requirement of the radiation heating system, the radiant heating controller is studied and developed with C8051F340 MCU. The control principle, control hardware, control algorithm and control software process are described. Implementation of HMI is on the touch screen by industrial series RS232 interface.

Numerical Simulation of Gas-Liquid Two-Phase Flows on Wetted Walls

2010 ◽  
Author(s):  
Yoshiyuki Iso ◽  
Xi Chen
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Liquid Flow ◽  
Film Flow ◽  
Liquid Flow Rate ◽  
Flow Transition ◽  
Wall Surface ◽  
Two Phase ◽  
Wall Flows ◽  
Rivulet Flow

Gas-liquid two-phase flows on the wall like liquid film flows, which are the so-called wetted wall flows, are observed in many industrial processes such as absorption, desorption, distillation and others. For the optimum design of packed columns widely used in those kind of processes, the accurate predictions of the details on the wetted wall flow behavior in packing elements are important, especially in order to enhance the mass transfer between the gas and liquid and to prevent flooding and channeling of the liquid flow. The present study focused on the effects of the change of liquid flow rate and the wall surface texture treatments on the characteristics of wetted wall flows which have the drastic flow transition between the film flow and rivulet flow. In this paper, the three-dimensional gas-liquid two-phase flow simulation by using the volume of fluid (VOF) model is applied into wetted wall flows. Firstly, as one of new interesting findings in this paper, present results showed that the hysteresis of the flow transition between the film flow and rivulet flow arose against the increasing or decreasing stages of the liquid flow rate. It was supposed that this transition phenomenon depends on the history of flow pattern as the change of curvature of interphase surface which leads to the surface tension. Additionally, the applicability and accuracy of the present numerical simulation were validated by using the existing experimental and theoretical studies with smooth wall surface. Secondary, referring to the texture geometry used in an industrial packing element, the present simulations showed that surface texture treatments added on the wall can improve the prevention of liquid channeling and can increase the wetted area.

Study on Spread of Fire Overflow on Building Facades with Insulation Materials

2013 ◽  
Vol 405-408 ◽  
pp. 2438-2442
Author(s):  
Yan Feng Li ◽  
Cong Cong Xu ◽  
Xue Fei Xing ◽  
Jin Zhang ◽  
Cheng Hu
Keyword(s):  
Numerical Simulation ◽  
Thermal Insulation ◽  
Maximum Temperature ◽  
Computational Results ◽  
Exterior Wall ◽  
Insulation Layer ◽  
Insulation System ◽  
High Rise ◽  
Building Facades ◽  
Fire Barrier

Fire overflow on exterior wall with thermal insulation system has been studied by numerical simulation. The spread laws of fire overflow are analyzed through the temperature distribution near the window. The computational results are compared with those of test in the Exterior Insulation Fire Barrier Technical Guidelines (EIFBTG). It has been found that the calculated maximum temperature points is closed to the test on the first floor, the first ceiling, and the points near the above two windows. However, there are differences between two kinds of results above two floors and ceilings, and the points near the first window. It has also shown that when the HHR is 7.5KW, the scope of damage of exterior thermal insulation layer is about 15 square meters near the window. The research would provide reference for fire protection design of exterior wall thermal insulation in the high-rise buildings.

scholarly journals Pb(II) removal using carbon adsorbents prepared by hybrid heating system: Understanding the microwave heating by dielectric characterization and numerical simulation

2019 ◽  
Vol 277 ◽  
pp. 663-671 ◽  
Author(s):  
Gabriela Durán-Jiménez ◽  
Virginia Hernández-Montoya ◽  
Jose Rodríguez Oyarzun ◽  
Miguel Ángel Montes-Morán ◽  
Eleanor Binner
Keyword(s):  
Numerical Simulation ◽  
Microwave Heating ◽  
Heating System ◽  
Carbon Adsorbents ◽  
Hybrid Heating ◽  
Dielectric Characterization

scholarly journals Study on Flow and Heat Transfer Characteristics of Supercritical Kerosene in a Round Tube

2020 ◽  
Vol 316 ◽  
pp. 03003
Author(s):  
Feng Gao ◽  
Qian Zhang ◽  
Hongyu Xiao ◽  
Fengli Chen ◽  
Xuefeng Xia
Keyword(s):  
Heat Transfer ◽  
Surface Temperature ◽  
Inlet Temperature ◽  
Wall Surface ◽  
Heat Transfer Characteristics ◽  
Navier Stokes Equation ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Wall Surface Temperature ◽  
Central Flow

The finite volume discrete solution of the Navier-Stokes equation and the RNG model of the turbulence model are used to numerically simulate the flow and heat transfer characteristics of supercritical kerosene in a circular tube. The results show that as the inlet mass flow increases, the wall surface temperature and the central flow oil temperature gradually decrease, and the pressure loss becomes larger. As the inlet temperature increases, the wall surface temperature and the central flow oil temperature both increase. When the heat flux density is constant, as the pressure increases, the deterioration of heat transfer will be weakened, and increasing the pressure can improve the effect of convection heat transfer.

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