Coupling of Convective and Radiative Heat Transfer in PV Cooling Ducts

2002 ◽  
Vol 124 (3) ◽  
pp. 250-255 ◽  
Author(s):  
B. J. Brinkworth
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Radiative Heat ◽  
Radiation Exchange ◽  
Axial Temperature ◽  
Pv Cooling ◽  
Cooling Air Flow ◽  
Cooling Air ◽  
Cooling Ducts ◽  
Laminar And Turbulent Flows

In a PV cooling duct, heat transfer from the heated side to the cooling air flow takes place partly by convection at the walls and partly by radiation exchange between them. A method is developed for representing these effects in combination, avoiding the uncertainties and iterations involved in treating the two mechanisms as independent and parallel. Though the radiative element introduces two further parameters, the procedure has a straightforward closed form, convenient for routine engineering calculations. An approximation, that treats the radiation exchange as determined by the local wall temperatures, is validated by comparison with published results in which the diffusion due to the axial temperature distribution is fully represented. The method is applicable to both laminar and turbulent flows, employing coefficients already available in the literature. The incorporation of duct heat transfer within thermal models of the PV installation is discussed briefly, highlighting further areas which are being refined by on-going work.

The Influence of Facility Conditions on A ±0.25 °C Repeatability Lamp Voltage Controlled RTP System

1997 ◽  
Vol 470 ◽  
Author(s):  
Peter Vandenabeele ◽  
Wayne Renken
Keyword(s):  
Heat Transfer ◽  
Radiative Heat ◽  
Cooling Water ◽  
Water Parameters ◽  
Wafer Temperature ◽  
Facility Conditions ◽  
Highly Sensitive ◽  
Flow Through ◽  
Cooling Air Flow ◽  
Cooling Air

ABSTRACTThe influence of cooling air and cooling water parameters on the wafer temperature was studied in an RTP system with lamp power control. With a cool down time of 150 seconds between consecutive heating cycles, the wafer temperature in a 1050 °C process was highly sensitive to cooling air flow. With a cool down time of 330 seconds the sensitivity dropped a factor of 5. This was explained through the effect of radiative heat transfer from the quartz to the wafer at higher quartz temperatures (>200 °C). Other factors are variations in the water flow through the oven walls and the repeatability of wafer positioning.

Heat transfer intensification for laminar and turbulent flows in a narrow channel with one-row oval dimples

2015 ◽  
Vol 53 (3) ◽  
pp. 375-386 ◽  
Author(s):  
S. A. Isaev ◽  
A. I. Leontiev ◽  
N. V. Kornev ◽  
E. Hassel ◽  
Ya. P. Chudnovskii
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Narrow Channel ◽  
Heat Transfer Intensification ◽  
Laminar And Turbulent Flows

Flow Visualisation in a Rotating Cavity With Axial Throughflow

2000 ◽  
Author(s):  
Dieter E. Bohn ◽  
Gregor N. Deutsch ◽  
Burkhard Simon ◽  
Claus Burkhardt
Keyword(s):  
Heat Transfer ◽  
Light Sheet ◽  
Video Camera ◽  
Flow Visualisation ◽  
Rotating Cavity ◽  
First Results ◽  
Flow Phenomena ◽  
Set Up ◽  
Cooling Air Flow ◽  
Cooling Air

Annular cavities are found inside rotor shafts of turbomachines with an axial or radial throughflow of cooling air. In order to increase efficiency and system reliability, flow and heat transfer phenomena in those cavities have to be investigated in order to minimize thermal load. For research purposes an experimental rig is set up. This paper focuses on flow visualisation using a laser light sheet technique in a heated rotating cavity which is axially flown through by cooling air. Flow phenomena are observed by a rotating telemetric video camera which shows smoke flowing through the light sheet area located in the axial midplane. The visualisation procedure is described and the first results are pointed out. Additionally, heat transfer measurement across the wall is shown.

Numercial Simulation of Sinter Cooling Process

2010 ◽  
Author(s):  
Fengguo Tian ◽  
D. Frank Huang ◽  
Chenn Q. Zhou
Keyword(s):  
Heat Transfer ◽  
Initial Temperature ◽  
Air Flow ◽  
Convection Heat Transfer ◽  
Cooling Process ◽  
Initial Temperature Distribution ◽  
Cooling Air Flow ◽  
Sinter Cooler ◽  
Cooling Air ◽  
Cooling Model

A 2-D sinter cooling model is built to simulate the hot iron ore sinter cooling process in a sinter cooler. In this model the convection heat transfer is applied for the heat transfer between the sinter particle skin and the cooling air flow. Thermal conduction is used for the heat conduction within the sinter particles, and fluid dynamics is applied tothe cooling gas distributions. This model will be able to analyze the effects of sinter particle size, size distribution, hot sinter initial temperature, initial temperature distribution, sinter cooler size, cooler configuration and cooling air flow rate as well as cooling air temperature on the sinter cooling process. In this paper the 2-D sinter cooling model is presented along with certain parametric study examples.

A Review of Forced Convective Heat Transfer in Stationary and Rotating Annuli

1996 ◽  
Vol 210 (2) ◽  
pp. 123-134 ◽  
Author(s):  
P R N Childs ◽  
C A Long
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Forced Convection ◽  
Turbulent Flows ◽  
Convective Heat ◽  
Heat Exchangers ◽  
Outer Cylinder ◽  
Forced Convective Heat Transfer ◽  
Analytical Research ◽  
Laminar And Turbulent Flows

The study of heat transfer by forced convection in annular passages is of interest across the range of process and aeronautical industries, for example from annular heat exchangers to the various configurations of annuli found in turbomachinery. The aim of this paper is to review relevant experimental, numerical and analytical research of heat transfer in both stationary and rotating annuli, with an emphasis on presenting useful information for designers. The geometries considered are the stationary annulus with superposed axial throughflow and the rotating annulus with rotation of either the inner or outer cylinder (both with and without throughflow). The work presented covers laminar and turbulent flows as well as flow regimes where transition occurs or vortex flows are present.

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