Experimental Study and Analysis on Heat Transfer Hot Air Temperature of Far Infrared Convection Combined Drying

2018 ◽  
Author(s):  
Chunshan Liu ◽  
Siyu Chen ◽  
Yang Hai ◽  
Junfa Wang ◽  
Bingshen Huang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Air Temperature ◽  
Far Infrared ◽  
Hot Air

Improving the Boiler Efficiency by Optimizing the Combustion Air

2015 ◽  
Vol 787 ◽  
pp. 238-242 ◽  
Author(s):  
R. Pachaiyappan ◽  
J. Dasa Prakash
Keyword(s):  
Heat Transfer ◽  
Water Temperature ◽  
Steam Generator ◽  
Air Temperature ◽  
Flue Gas ◽  
Maximum Heat ◽  
Air Preheater ◽  
Hot Air ◽  
Boiler Efficiency ◽  
Efficient Combustion

Air pre-heater and economizer are heat transfer surfaces in which air temperature and water temperature are raised by transferring heat from other media such as flue gas. Hot air is necessary for rapid combustion in the furnace and also for drying coal in milling plants. So an essential boiler accessory which serves this purpose is air pre-heater. The air pre-heater is not essential for operation of steam generator, but they are used where a study of cost indicates that money can be saved or efficient combustion can be obtained by their use. The decision for its adoption can be made when the financial advantages is weighed against the capital cost of heater. The efficiency of the boiler increases with the increase in the temperature of the combustion air used in the furnace. This is achieved by the increased temperature of the flue gas in the air preheater and economizer zone. This paper deals with the different ways to obtain the maximum heat from the flue gas travelling through the air preheater and the economizer zone to improve the boiler efficiency.

scholarly journals An Experimental Investigation on the Heat Transfer Coefficient of Oscillating Heat Pipes

2013 ◽  
Vol 732-733 ◽  
pp. 78-82
Author(s):  
Ling Gao ◽  
Wen Guang Geng ◽  
Xiao Xu Ma ◽  
Xiu Li Ma ◽  
Guang Liang Luo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Coefficient ◽  
Relative Humidity ◽  
Transfer Coefficient ◽  
Convective Heat Transfer Coefficient ◽  
Heat Pipes ◽  
Oscillating Heat Pipe ◽  
Hot Air ◽  
The Relationship

This paper presents an experimental study on total heat transfer coefficient (ht) in oscillating heat pipe heat exchanger hot air flow tunnels, ht plays an important role in the oscillating heat pipes design process. In this paper, ht and the convective heat transfer coefficient (h) was investigated by experimentally and theoretical calculation respectively. From experimental study, the relationship between the ratio of heat transfer coefficient and the relative humidity is obtained. The results show that the ratio of ht to h increases from 5 to 20 as the relative humidity of the hot gas increasing from 19.22% to 60%. According to the experimental data, a matched curve and an empirical equation were presented, which can be described as ht=h(1.87783+0.09631x+0.0032x2).

The Experimental Study on High Temperature Air Combustion and CF4 Decomposition

2005 ◽  
Author(s):  
L. Jia ◽  
S. Ma
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
High Temperature ◽  
Air Temperature ◽  
Waste Heat ◽  
Exhaust Gas ◽  
High Temperature Air Combustion ◽  
Factors Influencing ◽  
Regenerative Burner ◽  
Ceramic Honeycomb

For the purpose of decomposing the processing gases CF4 from semiconductor manufacturers, ceramic honeycomb regenerative burner system is suggested by using the principle of HTAC. A simulated high temperature air combustion furnace has been used to determine the features of HTAC flames and the results of the decomposition of CF4. The preheat air temperature of it is above 900 °C. The exhaust gas released into the atmosphere is lower than 150 °C. Moreover, the efficiency of recovery of waste heat is higher than 70%, the NOx level in exhaust gas is less than 300 mg/m3 and the distribution of temperature in the furnace is nearly uniform. The factors influencing heat transfer, temperature profile in chamber and NOx emission were discussed. Also some CF4 can be decomposed in this system. Experimental results indicated that the destruction removal efficiency (DRE) of CF4 increases with the increasing of concentration of H2O in some scale, and will not keep climbing when the concentration reach a point. DRE of CF4 decreases with the decreasing of concentration of CF4 under condition of other factors unchanged.

A Basic Numerical Study of the Effect of a Hot Air Vent on the Heat Transfer Rate From a Cold Window

2009 ◽  
Author(s):  
Patrick H. Oosthuizen
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Flow Pattern ◽  
Air Temperature ◽  
Temperature Difference ◽  
Numerical Study ◽  
Hot Air ◽  
Discharge Velocity ◽  
Discharge Temperature ◽  
Air Vent

In colder climates hot air vents are often mounted below a cold window to improve thermal comfort of the occupants. The presence of the vent alters the rate of convective heat transfer to the window and changes the air-flow pattern near the window and this has here been numerically studied. The situation considered in this study is an approximate model of most real situations. The window is represented by a plane isothermal section recessed into the wall, this window section being colder than the room air far from the window. The vent is assumed to be placed against the wall and to have a uniform discharge velocity which is normal to the vent surface. The vent has been assumed to be centrally located below the window. The flow has been assumed to be steady and both laminar and turbulent flows have been considered. The fluid properties have been assumed constant except for the density change with temperature that gives rise to the buoyancy forces, this being dealt with using the Boussinesq approach. The governing equations have solved using the commercial cfd code FLUENT, the k-epsilon turbulence model with buoyancy force effects fully accounted for having been used in the turbulent flow calculations. The solution has the following parameters: the Rayleigh number, the Reynolds number based on the vent discharge velocity, the dimensionless depth that the window is recessed, the dimensionless window-to-undisturbed-air temperature difference, the Prandtl number, the dimensionless width of the window, the dimensionless depth and width of the hot air vent, and the dimensionless vent discharge temperature-to-undisturbed-air temperature difference. Results have only been obtained for a Prandtl number of 0.7. The effects of the other dimensionless variables on the window Nusselt number and on the flow pattern and air temperature distribution near the window have been numerically determined.

The Experimental Study on Infrared Dryer for Corn

2015 ◽  
Vol 723 ◽  
pp. 711-714
Author(s):  
Chun Shan Liu ◽  
Si Yu Chen ◽  
Wen Fu Wu ◽  
Jun Fa Wang ◽  
Hai Bo Zhou
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Moisture Content ◽  
Air Temperature ◽  
Load Condition ◽  
Air Distribution ◽  
Drying Process ◽  
Drying Characteristics ◽  
Infrared Drying ◽  
Hot Air

To understand the drying characteristics of corn in infrared drying process, the research of corn post-harvest drying experiment was developed on self-developed infrared grain dryer. Analysing the influence of hot air temperature by blast capacity and the outlet size of air distribution under the full load condition, the change rules of the corn moisture content, the temperature change and the energy consumption characteristics during the drying process have been researched.

scholarly journals EXPERIMENTAL STUDY AND ANALYSIS OF SOLAR AIR HEATER USING OF VARIOUS INLET TEMPERATURES

2017 ◽  
Vol 5 (10) ◽  
pp. 76-80
Author(s):  
Deeksha Vishwakarma ◽  
Jyoti Kale
Keyword(s):  
Experimental Study ◽  
Solar Radiation ◽  
Air Temperature ◽  
Plate Glass ◽  
Experimental Setup ◽  
Solar Air Heater ◽  
Outlet Port ◽  
Inlet Port ◽  
Air Heater ◽  
Hot Air

In this paper, we are make the experimental setup and assembled the various components such as, flats plate glass, wood, collector, inlet port and outlet port. The collector are generated the hot air with the help solar radiation. The collector are aching the air from inlet port and finally hot air are out through outlet port. We are measured the maximum outlet hot air Temperature in °C.

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