Simulation of Transient Heat Transfer of Sandwich Pipes With Active Electrical Heating

2005 ◽  
Vol 127 (4) ◽  
pp. 366-370 ◽  
Author(s):  
Jian Su ◽  
Djane R. Cerqueira ◽  
Segen F. Estefen
Keyword(s):  
Heat Transfer ◽  
Energy Transport ◽  
Finite Difference Methods ◽  
Computational Simulation ◽  
Electrical Heating ◽  
Transient Heat Transfer ◽  
Viable Solution ◽  
Prolonged Cool ◽  
Production Conditions ◽  
Methods Numerical

This paper presents an analysis of transient heat transfer in sandwich pipelines with active electrical heating. The mathematical models governing the heat conduction in the composite pipeline and the energy transport in the produced fluid were solved by using finite difference methods. Numerical results of computational simulation of cool-down for three sandwich pipeline configurations under typical production conditions were presented. The analysis showed that the sandwich pipe with active heating is a viable solution to meet severe flow assurance requirements of ultra-deepwater oil production even under unplanned and prolonged cool-down conditions.

Simulation of Transient Heat Transfer of Sandwich Pipes With Active Electrical Heating

2004 ◽  
Author(s):  
Djane R. Cerqueira ◽  
Jian Su ◽  
Segen F. Estefen
Keyword(s):  
Heat Transfer ◽  
Oil And Gas ◽  
Finite Difference Methods ◽  
Computational Simulation ◽  
Gas Production ◽  
Electrical Heating ◽  
Transient Heat Transfer ◽  
Flow Assurance ◽  
Insulation Material ◽  
Production Conditions

Sandwich pipes consisting of two concentric metal pipes with insulation material in the annulus have been developed to meet challenging mechanical and thermal requirements of deep and ultra deepwater oil and gas production. Passive thermal insulation is designed to meet flow assurance requirements under steady-state production conditions, but is unlikely to meet more severe conditions during transient events such as warm-up and cool-down. In this work, we present the analysis of transient heat transfer in the sandwich pipelines with active electrical heating. The mathematical model governing the heat conduction in the composite pipeline and the energy transport in the produced fluid is solved by using finite difference methods. As unplanned cool-down of the pipelines is most critical to safe and economical operation of pipelines in deep and ultra deep water conditions, it is presented here numerical results of computational simulation of cool-down for three sandwich pipeline configurations under typical production conditions. The analyses show that the sandwich pipe with active heating is a viable solution to meet severe flow assurance requirements of ultra deepwater oil production even under unplanned and prolonged cool-down conditions.

scholarly journals Transient Heat Transfer and Energy Transport in Packed Bed Thermal Storage Systems

10.5772/20979 ◽  
2011 ◽  
Author(s):  
Pei Wen ◽  
Jon Van ◽  
Wafaa Karaki ◽  
Cho Lik ◽  
Jake Stephens ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Transport ◽  
Storage Systems ◽  
Thermal Storage ◽  
Packed Bed ◽  
Transient Heat Transfer

Transient heat-transfer analysis for sub-scale noz...

2005 ◽  
Author(s):  
Dr. Jae-Seok Yoo ◽  
Mr. Byung-Hun Kim ◽  
Dr. Young-Soon Jang ◽  
Dr. Yeong-Moo Yi
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Analysis ◽  
Transient Heat Transfer

AN EXPERIMENTAL AND NUMERICAL STUDY OF HEAT TRANSFER IN A SIMULATED COLLECTOR FOR A SOLAR DRYER

1993 ◽  
Vol 17 (2) ◽  
pp. 145-160
Author(s):  
P.H. Oosthuizen ◽  
A. Sheriff
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Local Heat Transfer ◽  
Lower Surface ◽  
Local Heat ◽  
Electrical Heating ◽  
Temperature Profiles ◽  
Measured Temperature ◽  
Transfer Rates ◽  
Thermocouple Probe

Indirect passive solar crop dryers have the potential to considerably reduce the losses that presently occur during drying of some crops in many parts of the “developing” world. The performance so far achieved with such dryers has, however, not proved to be very satisfactory. If this performance is to be improved it is necessary to have an accurate computer model of such dryers to assist in their design. An important element is any dryer model is an accurate equation for the convective heat transfer in the collector. To assist in the development of such an equation, an experimental and numerical study of the collector heat transfer has been undertaken. In the experimental study, the collector was simulated by a 1m long by 1m wide channel with a gap of 4 cm between the upper and lower surfaces. The lower surface of the channel consisted of an aluminium plate with an electrical heating element, simulating the solar heating, bonded to its lower surface. Air was blown through this channel at a measured rate and the temperature profiles at various points along the channel were measured using a shielded thermocouple probe. Local heat transfer rates were then determined from these measured temperature profiles. In the numerical study, the parabolic forms of the governing equations were solved by a forward-marching finite difference procedure.

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